Drilled Shafts for Bridge Foundation Stability Improvement Ohio 833 Bridge over the Ohio River An Update
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1 Drilled Shafts for Bridge Foundation Stability Improvement Ohio 833 Bridge over the Ohio River An Update Meigs County, Ohio Mason County, West Virginia By Stan Harris, P.E. and Eric Kistner, P.E. FMSM Engineers Geohazards in Transportation Appalachian Region Technical Forum August 1-2,
2 Agenda I. Introduction/Background A. General B. Initial Slope Movement C. Remediation Scheme D. Instrumentation Plan II. Instrumentation Results/Recent Slope Movement III. New Instrumentation on Existing Bridge IV. Lessons Learned V. Question/Answer
3 I. Introduction/Background
4 Project Location Pomeroy, Ohio
5 Project Team Owner: ODOT/WVDOH Designer: URS Corporation Contractor: Mahan/National Joint Venture Geotechnical Consultant FMSM
6 Existing Structure OHIO WEST VIRGINIA
7 Proposed Structure WEST VIRGINIA OHIO
8 Project Timeline FMSM Geotechnical Exploration Bridge Design Bridge Construction Slope Movement Detected Slope Monitoring Monitoring of Existing Bridge Construction of Protective Measures Monitoring of Protective Measures
9 Current State of Construction
10 Stability Issues/Slope Movement/Reaction New Main Street Embankment Short-Term Stability Concerns Controlled Rate-of of-fill Slope Inclinometers Piezometers Initial Detection of Movement Additional Instrumentation
11 Original Extents of Slope Movement Approximate Limits of Slope Movement
12 Probable Causes of Slope Movement Weak slickensided clay shale (mudstone) Possible ancient movement Construction activity/embankment Rapid drawdown cycles of Ohio River
13 Slope Geology/Geometry Residual Clay New Fill Shale/Clay Shale/Mudstone Bedrock Apparent Failure Surface Existing Fill Alluvial Silt and Clay Siltstone Ohio River
14 ODOT s s Preferred Option and Related Decisions Realign Main Street to Reduce Fill Height Abutment Touch Down Pier NEW BRIDGE Ohio Tower Ohio River Siltstone Change Abutment and Land Pier Foundations to Drilled Shafts Potential Failure Surface One Row of Nine Drilled Shafts Between the Land Pier and the Water Pier
15 Plan View of Stabilization Shafts 8 Diameter Drilled Shafts on 12 c/c Spacing
16 Revised Roadway Plan
17 Instrumentation Plan Site Slope Inclinometers, Piezometers Existing Bridge Tiltmeters, Survey Targets Touch Down Pier Strain Gauges, In- Place and Manually Read Inclinometer Stabilization Shafts Tiltmeters, Strain Gauges, In-Place and Manually Read Inclinometers
18 Stabilization Shaft Instrumentation Plan
19 II. Recent Slope Movement/ Instrumentation Results
20 Recent Movement (Oct 06 - Feb 07) Detection Instrumentation Activity (late October) Tension Cracks (early December) Water Main Break (early December) Causes Construction Activity River Fluctuation
21 Tension Cracks 12/11/06
22 Construction Activity 11/30/06
23 Ohio River Fluctuations Ohio River Fluctuations River Elevation (feet) Slope Movement 10/1/04 12/1/04 2/1/05 4/1/05 6/1/05 8/1/05 10/1/05 12/1/05 2/1/06 4/1/06 6/1/06 8/1/06 10/1/06 12/1/06 2/1/07
24 Tied Back Retaining Wall
25 Site Results of Instrumentation 4 Years of Data Numerous Inclinometers Sheared Due to Slope Movement Existing Bridge 3 Years of Data Abutment Tilt Due to Recent Movement New Bridge Touch Down Pier 3 Years of Data Top Deflection Due to Lateral Loading Stabilization Shafts 2 Years of Data Northernmost Shaft Being Loaded
26 Current Extents of Slope Movement Limits of Movement
27 Abutment Existing Bridge Tiltmeter Results Existing Bridge Tiltmeter Results Land Pier Top Land Pier Bottom Zeroed Y-Tilt Readings Positive Top Moving Downslope Water Pier Top Land Pier Bottom 09/01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/ /01/2004 Time Land Pier Top Abutment Water Pier Top Instrument Malfunction Instrument Malfunction Tilt (deg)
28 Existing Bridge Tiltmeter Results Land Pier Top Tiltmeters Temperature Influence on X-Tilt Readings Temperature (F) Temperature Influence on Y-Tilt Readings Temperature (F) Tilt (deg) Looking Upslope, Positive Clockwise Tilt Third Track: Oct-2006 Dec Fifth Track: Feb-2007 July-2007 First Track: Oct-2004 Mar Fourth Track: Dec-2006 Feb Positive Top Moving Downslope Second Track: Aug-2005 Oct Temperature (C) Temperature (C)
29 Stabilization Shaft Strain Gage Results SS9: Moment Diagram Elevation (ft) Cracking Moment Top of Shaft Top of Rock With Linear Regression Cracking Moment Darker = More Recent LPILE 0.2" 21-Oct Nov Nov Dec Dec Dec Jan Jan Feb Feb Mar Mar Apr Apr May May Jun Jun Jul Jul-2007 Bottom of Shaft Moment (kip-ft) Positive Moment Tension on Upslope Face
30 Stabilization Shaft 9 IPI Plot
31 Touch Down Pier Strain Gage Results Touch Down Pier Strain Gage Results DS-54: Bending Moment History Cracking Moment (approx. 30% of Moment Capacity) El. 530 ft El. 534 ft El. 542 ft 09/01/07 08/01/07 07/01/07 06/01/07 05/01/07 04/01/07 03/01/07 02/01/07 01/01/07 12/01/06 11/01/06 10/01/06 09/01/06 08/01/06 07/01/06 06/01/06 05/01/06 04/01/06 03/01/06 02/01/06 01/01/06 12/01/05 11/01/05 10/01/05 09/01/05 08/01/05 07/01/05 06/01/05 05/01/05 04/01/05 03/01/05 02/01/05 01/01/05 12/01/04 11/01/04 10/01/04 09/01/ Time El. 566 ft El. 576 ft Cracking Moment (approx. 30% of Moment Capacity) Bending Moment (kip-ft)
32 III. New Instrumentation on Jointmeters (3 Joints on Ohio Side) Tiltmeters on Linkage Assemblies Strain Gages on Truss Members Existing Bridge
33 IV. Lessons Learned Difficulty with Instrumentation Durability in Construction/River Environment Sole-Source Source Instrumentation Consultants Communication Between Contractor and Engineer Key Better Results from Tiltmeters/Strain Gages than IPI s Look for Agreement Between Instruments Human Intervention with Instruments Necessary At Times Installation and Access Can Be Difficult
34 V. Questions/Answers
Drilled Shafts for Bridge Foundation Stability Improvement: Ohio 833 Bridge over the Ohio River. Meigs County, Ohio Mason County, West Virginia
Drilled Shafts for Bridge Foundation Stability Improvement: Ohio 833 Bridge over the Ohio River Meigs County, Ohio Mason County, West Virginia By Stan Harris, P.E. and Eric Kistner, P.E. FMSM Engineers
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