Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of...
Transcript of Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of...
![Page 1: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/1.jpg)
Slope Stabilization using Drilled Shafts: Design and
Long-Term Monitoring
Jamal Nusairat, Ph.D., P.E.E.L. Robinson Engineering of Ohio Co.
&Izzaldin Almohd, Ph.D., P.E.
Huesker Synthetic GmbH
8/4/2010
![Page 2: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/2.jpg)
Presentation Outlines
IntroductionGeotechnical Analysis Structural Design Instrumentation & Long-Term Monitoring Summary and Conclusions
![Page 3: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/3.jpg)
Introduction
1. Slope remediation using drilled shafts
2. Single row of drilled shafts Inexpensive
Various techniques and equipments
Has been successfully used
Simple to design
![Page 4: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/4.jpg)
Geotechnical Elementso Geometryo FS improvemento Shaft forceo Soil Arching
![Page 5: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/5.jpg)
Analysis Methodology
Define Geometry Define Stratigraphy and Material Properties Initial Slope Stability Analysis (no stabilization)
Determine the need and location of stabilization Elements
Assume Shafts diameter, length, and spacing Verify/modify assumed shaft parameters
Verify Shaft Structural adequacy (Lateral Analysis)
![Page 6: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/6.jpg)
Stability Analysis: Limiting Equilibrium(Method of Slices)
W
Potential Slip Surface
in
Slice i - 1Slice iSlice i + 1 Pile
Vi-2Vi-1Vi-1ViVi? ??
Hi-2
HiHi-1
WW
Ni-1
Si-1/FSSi/FS
NiNi+1
Si+1/FS
![Page 7: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/7.jpg)
Soil Arching
Direction of Moving Soil
S
S
S
Arching Load
1
3
2
Arching MechanismLiang and Zeng (2002)
ODOT Research Report: Drilled Shaft Foundations for Noise Barrier Walls and Slope Stabilization (2002)
![Page 8: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/8.jpg)
UA Slope Program to
Design Landslides using Drilled Shafts
![Page 9: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/9.jpg)
Initial Slope Stability
![Page 10: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/10.jpg)
Slope Stability W/ Drilled Shafts
![Page 11: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/11.jpg)
![Page 12: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/12.jpg)
![Page 13: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/13.jpg)
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
0 10 20 30 40 50 60 70 80 90 100 110 120Offset (ft)
Safe
ty F
acto
r
0
50
100
150
200
250
300
350
400
Shaf
t For
ce (K
ip)
FS; S/D = 2FS; S/D = 3Shaft Force (Kip); S/D = 2Shaft Force (Kip); S/D = 3
![Page 14: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/14.jpg)
Lateral Analysis Results Assumed Shaft diameter, Reinforcement, and
concrete strength. Defined loads from Slope Stability Analysis (UA
Slope, FEM…) Run Lateral Analysis (L-Pile, COM624, FB-Multi
Pier, FEM… )
Results Deflection Moment Shear verify/modify section
![Page 15: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/15.jpg)
Perform Lateral AnalysisVerify assumed diameter, spacing, and
length of shaft
![Page 16: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/16.jpg)
Moment Shear
![Page 17: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/17.jpg)
Z
Slip Surface
Lateral Deflection
Design Shear = 1.69×Vmax
Design Moment = 1.69×Mmax
D
NetShaftF
2 NetShaft
uFPZ
Structural Design of Drilled Shaft
![Page 18: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/18.jpg)
39’ 02”
#6@12 in
#6@12 in
#6@12 in
X X
D = 60 in
3 in cover
#6@12 in
36#11
X - X
![Page 19: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/19.jpg)
Field Instrumentation and Monitoring
JEF-152-1.3
WAS-7-47.9
MRG-376-1.1
HAM-275-7.02
![Page 20: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/20.jpg)
Projects Design Summary
Site D(ft)
S/D(ft/ft)
Lp(ft)
Lr(ft)
Fshaft(kips)
# of
Shafts
Offset(ft)
JEF-152-1.30 3.5 2 45 20 100 42 40
WAS-7-47.90 4 2, 3 40 10 200 128 90
MRG-376-1.1 4 2 40 18 165 23 20
HAM-275-7.02 4 2 55 15 165 54 180
![Page 21: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/21.jpg)
JEFF – 152-1.3
![Page 22: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/22.jpg)
56+00 57+00 55+00
40 ft
Lateral Load Test Shafts
The two instrumented drilled shafts (#20 & #21
S.R. 152
3. 5 ft-Diameter Drilled Shafts
42 Drilled Shafts; S/D = 2 on centers
Work Limits
PZ-1
INC#4 Sliding Zone Limits
PZ-2
PZ-3
INC#3 Shaft #1
Shaft #42
250 ft
CL S. R. 152
TOR
Offset = 40 ft PZ: Piezometers INC: Inclinometer
PZ-1 (20 ft)
PZ-2 (22 ft)
PZ-3 (23 ft)
INC#3
INC#4
INC#1 & #2
25 ft
20 ft
A single row of 42 Drilled Shafts:
(D = 3. 5 ft; S/D = 2 on centers)
Water Table Existing Slip Surface
160 ft
Instrumentation Plans/Slope Section
![Page 23: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/23.jpg)
Instrumentation/Shafts
![Page 24: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/24.jpg)
JEF-152-1.30Shaft Properties
D (ft) Reinforc. Moment capacity (k-f)
Loadkips
Max Deflection (in)
3.5 26 #11 2,824 102 3.2
Max. Deflection: LPILE AnalysisLoad : UA Slope Analysis
![Page 25: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/25.jpg)
Drilled Shafts DeflectionSH#20 SH#21
![Page 26: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/26.jpg)
Moments in Shaft #20 and Shaft #21 Moment in SH#20 Moment in SH#21
Max. Moment Observed = 950 ft-kipsNominal Moment Capacity = 2,824 ft-kips
A factor of 2.97
![Page 27: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/27.jpg)
WAS – 7-47.9
![Page 28: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/28.jpg)
Shaft Properties
D (ft) Reinforc. Moment capacity (k-f)
Loadkips
Max Deflection (in)
4.0 32 #14 4,918 63 2.6
Max. Deflection: LPILE AnalysisLoad : UA Slope Analysis
![Page 29: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/29.jpg)
Soil MovementUp-Slope Down-SlopeIn-between
![Page 30: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/30.jpg)
Drilled Shafts DeflectionSH#53 SH#54
![Page 31: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/31.jpg)
Moments in Shaft #20 and Shaft #21 Moment in SH#53 Moment in SH#54
Max. Moment Observed = 225 ft-kipsNominal Moment Capacity = 4,918 ft-kips
The factor is very high
![Page 32: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/32.jpg)
HAM-275-7.02
![Page 33: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/33.jpg)
HAM-275-7.02
![Page 34: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/34.jpg)
HAM-275-7.02
![Page 35: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/35.jpg)
HAM-275-7.02
![Page 36: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/36.jpg)
HAM-275-7.02
![Page 37: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/37.jpg)
HAM-275-7.02
![Page 38: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/38.jpg)
ERI-60-0227 over Vermillion River
![Page 39: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/39.jpg)
ERI-60-0227 over Vermillion River
![Page 40: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/40.jpg)
PIER 1PIER 3 PIER 4
RIVER
PIER 2
VERMILION
RIVER
ELEVATION
PLAN
203' 254' 254' 230' 190'
60 Overmilion River
ERI-60-0227 over Vermillion River
![Page 41: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/41.jpg)
ERI-60-0227 over Vermillion River
![Page 42: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/42.jpg)
Section Through Drilled
STEEL CASING
INCLINOMETER TUBE
18-HP12x5310-HP12x53
12'-0" DIAMETERDRILLED SHAFT
18 BARS
(TYPICAL)
ERI-60-0227 over Vermillion River
![Page 43: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/43.jpg)
ERI-60-0227 over Vermillion River
![Page 44: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/44.jpg)
ERI-60-0227 over Vermillion River
![Page 45: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/45.jpg)
ERI-60-0227 over Vermillion River
![Page 46: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/46.jpg)
ERI-60-0227 over Vermillion River
![Page 47: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/47.jpg)
ERI-60-0227 over Vermillion River
![Page 48: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/48.jpg)
The deflection at the top of drilled shaft pier #2
Deflection, in-1.2-1.0-0.8-0.6-0.4-0.20.0
The
num
ber o
f ten
sion
ed a
ncho
rs
0
1
2
3
4
5
6
7
8
FEMMeas.
ERI-60-0227 over Vermillion River
![Page 49: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/49.jpg)
ERI-60-0227 over Vermillion River
![Page 50: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/50.jpg)
ERI-60-0227 over Vermillion River
![Page 51: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/51.jpg)
ERI-60-0227 over Vermillion River
![Page 52: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/52.jpg)
CUY-90-15.24
![Page 53: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/53.jpg)
Site Condition Prior to Construction
CUY-90-15.24
![Page 54: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/54.jpg)
St bilit E l ti d Sli f
F.S.=1.25
F.S.=1.1
CUY-90-15.24
![Page 55: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/55.jpg)
CUY-90-15.24
![Page 56: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/56.jpg)
CUY-90-15.24
![Page 57: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/57.jpg)
CUY-90-15.24
![Page 58: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/58.jpg)
![Page 59: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/59.jpg)
Summary and Conclusions The use of drilled shafts to stabilize slopes
demonstrated to be an effective method
The design process is an optimization of the drilled shaft size, spacing, location along the slip plane, and length
The factor of safety was enhanced in all the cases
The calculated shaft deflection is always more than the field measured deflection
![Page 60: Slope Stabilization using Drilled Shafts: Design and Long-Term … · 2016-03-25 · The use of drilled shafts to stabilize slopes demonstrated to be an effective method The design](https://reader030.fdocuments.us/reader030/viewer/2022040905/5e79c3eae3569272bc088d3b/html5/thumbnails/60.jpg)
Thank You
QUESTIONS?