WSDOT's tunnel briefing for City Council

8/9/2019 WSDOT's tunnel briefing for City Council

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Organization

Date

Seattle City Council

May 18, 2015


2/32

Today’sAgenda

• SR 99 Tunnel Project

update

• Settlement update, ongoing

monitoring

• Construction progress

photos

2


3/32

Repairing

BERTHA3

The cutterhead on its repair

platform


4/32

Repairing

BERTHA4

Milling thrust seal on cutter

column


5/32

Repairing

BERTHA5

Removal of inner cylinder and

agitator from main bearing

Cracks in the main

bearing bull gear


6/32

Repairing

BERTHA6

Damaged pinion gear

Cutter drive motor


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Settlement

REPORTS7

Two reports

• WSDOTo Interim Settlement Evaluation Report,

Shannon & Wilson, Inc.

• Seattle Tunnel Partnerso Technical memorandum regarding ground

settlement from dewatering during

construction, Brierley Associates


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Multiple

AQUIFERS8


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‐18

‐17

‐16

‐15

‐14

‐13

‐12‐11

‐10

‐9

‐8

‐7

‐6

‐5

‐4

‐3‐2

‐1

0

1

2

3

4

5

1 2 /

1 / 1 4

1 2 /

8 / 1 4

1 2 / 1

5 / 1 4

1 2 / 2

2 / 1 4

1 2 / 2

9 / 1 4

1 /

5 / 1 5

1 / 1

2 / 1 5

1 / 1

9 / 1 5

1 / 2

6 / 1 5

2 /

2 / 1 5

2 /

9 / 1 5

2 / 1

6 / 1 5

2 / 2

3 / 1 5

3 /

2 / 1 5

3 /

9 / 1 5

3 / 1

6 / 1 5

3 / 2

3 / 1 5

3 / 3

0 / 1 5

4 /

6 / 1 5

4 / 1

3 / 1 5

4 / 2

0 / 1 5

4 / 2

7 / 1 5

5 /

4 / 1 5

N O R M A L I Z E D P I E Z O M

E T E R I C H E A D C H A N G

E ( f e e t )

DPM‐1 at Elev. ‐119'



PZ‐8 at Elev. ‐124' (outside)

PZ‐7 at Elev. ‐134' (outside)

Upper Aquifer, December to March, April, & May 1st

Current Groundwater Levels

Groundwater

levels currently

stable –

drawdown notincreasing

Source: Shannon

and Wilson report

Middle Aquifer, December to March, April, & May 1stLower Aquifer, December to March, April, & May 1st

9


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Settlement

REPORTS10

Five hypotheses from Shannon & Wilson report1. Pioneer Square has a long history of settlement.

Settlement occurred before the project and continues

to occur. May be due to compression of subsurfacewood debris and soft soil, traffic loading, etc.

2. Construction projects in the vicinity including

dewatering and excavation contributed to settlement.

3. Downtown Seattle is active seismic zone and groundvibrations contributed to settlement.

4. Project dewatering activities caused soils to

compress causing settlement. Compression or

consolidation of Holocene deposits.5. Compression of glacially overridden soils.


11/32


12/32

Settlement

REPORTS12

Calculated elevation change since 2010 based on LiDAR analyses. This figure

indicates the presence of localized areas of settlement that were present prior

to project activities in the area.


13/32

Settlement

REPORTS13

InSAR analysis

• 7/10/12 – 11/5/14

• 11/5/14 – 12/7/14

• 12/7/14 – 1/8/15


14/32

Expanded

MONITORING14

Jack Main


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Settlement

MONITORING15


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Settlement

MONITORING16

• All readings shown are based on WSDOT survey data.

• The blue points represent the net change in elevation detected at a single reading as compared to original baseline elevation.

• +/- 0.125-inch margin of error for each reading.

• Three survey teams are collecting and analyzing data: WSDOT, STP and the City of Seattle.

Columbia Street and Second Avenue

(Primary Surface Survey Control Point – X35)

S e t t l e m e n t ( i n . )

‐ 0 . 1

6

‐ 0 . 1

6

‐ 0 . 1

6

‐ 0 . 1

6

‐ 0 . 2

0

‐ 0 . 2

0

‐ 0 . 2

0

‐ 0 . 2

0

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


17/32


18/32

Settlement

MONITORING18





James Street and Fifth Avenue

(Primary Surface Survey Control Point – AWV011)


‐ 0 . 1

6

‐ 0 . 1

6

‐ 0 . 2

0

‐ 0 . 1

6

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


19/32

Settlement

MONITORING19


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South Main Street and First Avenue South


Settlement

MONITORING20






‐ 0 . 7

1

‐ 0 . 7

1

‐

0 . 6

7

‐ 0 . 7

5

‐ 0 . 7

1

‐ 0 . 7

1

‐ 0 . 7

5

‐ 0 . 8

3

‐ 0 . 9

4

‐ 0 . 9

4

‐ 0 . 9

4

‐ 0 . 9

4

‐ 0 . 9

8

‐ 0 . 9

4

‐ 0 . 9

4

‐ 0 . 9

4

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

4

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


21/32

South Main Street and First Avenue South

(Secondary Surface Survey Control Point – MAIN)

Settlement

MONITORING21

• All readings shown are based on STP survey data.




S e t t l e m e n t ( i n

. )

‐ 1 . 0

4

‐ 1 . 0

8

‐ 1 . 1

5

‐ 1 . 1

2

‐ 1 . 1

5

‐ 1 . 0

3

‐ 1 . 0

6

‐ 1 . 0

6

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

4

‐ 1 . 0

9

‐ 1 . 1

0

‐ 1 . 0

9

‐ 1 . 1

0 ‐ 0 . 9

5

‐ 1 . 0

0

‐ 0 . 9

8

‐ 1 . 0

1

‐ 0 . 9

8

‐ 1 . 0

0

‐ 1 . 0

0

‐ 1 . 0

0

‐ 0 . 9

8

‐ 1 . 0

0

‐ 1 . 0

0

‐ 0 . 9

7

‐ 0 . 9

8

‐ 0 . 9

7

‐ 1 . 0

0

‐ 1 . 0

6

‐ 0 . 9

7

‐ 1 . 0

1

‐ 0 . 9

8

‐ 0 . 9

8

‐ 0 . 9

8

‐ 1 . 0

2

‐ 1 . 2

1

‐ 1 . 1

6 ‐ 1 . 0

0

‐ 1 . 0

0

‐ 0 . 9

8

‐ 1 . 1

3

‐ 1 . 0

6

‐ 1 . 0

3

‐ 1 . 0

7

‐ 1 . 0

3

‐ 1 . 0

0

‐ 1 . 0

7

‐ 1 . 0

6

‐ 1 . 0

7

‐1.5

‐1.25

‐1

‐0.75

‐0.5‐0.25

0

0.25

Survey

Accuracy


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South Jackson Street and First Avenue South

(Primary Surface Survey Control Point – Y04)

Settlement

MONITORING22






‐ 0 . 8

7

‐ 0 . 8

7

‐ 0 . 8

7

‐ 0 . 8

7

‐ 0 . 8

7

‐ 0 . 8

7

‐ 0 . 9

1

‐ 0 . 9

8

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

4

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

0

‐ 1 . 1

4

‐ 1 . 1

0

‐ 1 . 1

4

‐

1 . 1

4

‐ 1 . 1

4

‐ 1 . 1

8

‐ 1 . 1

8

‐ 1 . 1

8

‐

1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


23/32

South Jackson Street and First Avenue South

(Secondary surface survey control point – JACK)

Settlement

MONITORING23

• All readings shown are based on STP survey data.





‐ 1 . 1

6

‐ 1 . 1

6

‐ 1 . 1

8

‐ 1 . 2

4

‐ 1 . 1

8

‐ 1 . 1

5

‐ 1 . 1

4

‐ 1 . 1

6

‐ 1 . 2

2

‐ 1 . 1

8

‐ 1 . 2

4

‐ 1 . 1

8

‐ 1 . 2

1

‐ 1 . 2

2

‐ 1 . 2

2

‐ 1 . 0

8

‐ 1 . 1

4

‐ 1 . 1

6

‐ 1 . 1

5

‐ 1 . 1

4

‐ 1 . 1

4

‐ 1 . 1

6

‐ 1 . 1

3

‐ 1 . 1

6

‐ 1 . 1

8 ‐ 1 . 0

7

‐ 1 . 0

6

‐ 1 . 1

9

‐ 1 . 2

2

‐ 1 . 3

7 ‐ 1 . 2

8

‐ 1 . 3

9 ‐ 1 . 2

1

‐ 1 . 2

8

‐ 1 . 2

4

‐ 1 . 2

4

‐ 1 . 1

9

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

Survey

Accuracy


24/32

South Jackson Street and Second Avenue Extension South

(Primary Surface Survey Control Point – GP232)

Settlement

MONITORING24






‐ 0 . 4

3

‐ 0 . 4

3

‐ 0 . 6

3

‐ 0 . 6

3

‐ 0 . 6

3

‐ 0 . 6

3

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


25/32

South King Street and Second Avenue South


Settlement

MONITORING25






‐ 1 . 2

6

‐ 1 . 2

6

‐ 1 . 3

0

‐

1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


26/32

Settlement

MONITORING26


27/32

First Avenue South between Railroad Way South

and South Royal Brougham Way

(Primary Surface Survey Control Point – Y09)

Settlement

MONITORING27






‐ 0 . 7

1

‐ 0 . 7

5

‐ 0 . 7

5

‐ 0 . 7

9

‐1.5

‐1.25

‐1

‐0.75

‐0.5

‐0.25

0

0.25

Survey

Accuracy


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South Cut and Cover

TUNNEL28

Crews smooth the concrete

roadway deck inside the cut

and cover section of tunnel


29/32

SOUTH OPERATIONSBuilding

29

Structural steel is

taking shape

PLACEHOLDER

Visualization of the

completed building


30/32

Building the

NORTH PORTAL30

The north portal continues to

take shape


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Building the

NORTH ACCESS31

The future off ‐ramp to

Aurora Avenue


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How toREACH US

Website:

www.AlaskanWayViaduct.org

Twitter:

@BerthaDigsSR99

Email:

[email protected]

Hotline:

1-888-AWV-LINE

Our information center,

Milepost 31, is located

at 211 First Ave. S. in

Seattle’s Pioneer

Square neighborhood.32

WSDOT's tunnel briefing for City Council

Documents

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