A World of Solutions TM Falgout Canal Floodgate Structure Unbalanced Forces and Proposed Solutions...

A World of SolutionsTM

Falgout Canal Floodgate Structure

Unbalanced Forces and Proposed Solutions

October 2013

2A World of SolutionsTM


Status– Project is in preliminary engineering phase – Estimated completion is mid November 2013

Meeting Goals– Present findings of unbalanced load calculations– Discuss proposed methodology of engineering

structure to accommodate unbalanced forces– Receive feedback from CPRA & proceed with

preliminary design

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Unbalanced Force - Landing Structure



Unbalanced Force in Landing Structure

Global Stability Analyses Results

Load CaseRequired

Safety Factor for Global Stability

Calculated Safety Factor

for Global Stability

Computed Unbalanced Force to Meet Criteria

(lbs/ft.)

Water to Top of Wall (EL.+18’) 1.4 1.14 7,700

Still Water Level (EL.+15’) 1.5 1.3 2,000


Slope/W Analysis



Site Plan Falgout Canal Floodgate Structure


Group 2013 Analysis




1. Global Stability Analysis– Calculate factor of safety and failure surface

using vertical water pressure only– Apply a resisting force until factor of safety

meets criteria

2. Design Structure to Resist Unbalanced Load

– Option 1 – Widen barge structure (Analyzed in Slope/W)

– Option 2- Use cutoff wall, landing piles and receiving structure together

(Analyzed in Group 2013 by Ensoft)



1. Analyze global stability for SWL2. Determine unbalanced force and failure plane EL3. Perform preliminary design of gate landing

foundation and receiving structure w/o unbalanced forces

4. Apply unbalanced force to gate landing foundation– Unbalanced force resisted by gate foundation alone

5. Apply static hydraulic forces to receiving structure w/o soil above failure surface

– Hydraulic force resisted by receiving structure alone

6. Apply unbalanced force and hydraulic force to combined gate foundation and receiving structure

– Unbalanced force + Hydraulic force resisted by gate foundation and receiving structure together

Unbalanced Forces Outline



Unbalanced Force


Falgout Canal Floodgate Control Structure

Analyses SummarySWL TOW

Analysis Case Δ (in) Pile Shear (K)Pile

Bending Stress (Ksi)

Δ (in) Pile Shear (K) Pile Bending Stress (Ksi)

Rec./Hydraulic3.73

- -5.61

- -4.75 7.54

Landing W/ Unbalanced

Force

0.19 7 3 4 22.5 18

0.64 6 3

14.1 19 22

Landing + Rec. Hydraulic Load

2.5 38 21 5.37 34 27

3.7 18 11 7.13 13 14

Landing + Rec. Hydraulic+

Unbalanced Load

2.83 41 23 6.8 41 32

4.17 20 20 9.1 16 18

SWL Unbalanced Force 187 K TOW Unbalanced Force 722 KSWL Hydraulic Force 1,730 K TOWL Hydraulic Force 2,250 K


Conclusion

Falgout Canal Floodgate Control Structure

• Unbalanced force can be resisted by cutoff wall combined with landing piles together

• Hydraulic force can be resisted by the receiving structure• The connection of the cutoff wall and the landing piles

together and the transfer of forces between the landing foundation and the receiving structure is by a pile cap at landing piles and/or through the gate structure.


Braced Wall Design

A World of Solutions TM Falgout Canal Floodgate Structure Unbalanced Forces and Proposed Solutions...

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