MSE Walls Problems and Solutions

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1 MSE Walls Problems and Solutions Peter Narsavage, P.E. Foundation Engineering Coordinator Ohio Department of Transportation Office of Structural Engineering ODOT Geotechnical Workshop April 11, 2006

2 Problems Sand leaking from joints Settlement of panels Uncontrolled drainage Deteriorating panels

3 Sand leaking from slip joint

4 Sand pile under vertical joint

5 Settlement of panels

6 Erosion along MSE wall

7 Void beneath slab Joint separation

8 Final resting place of MSE wall fill

9 Another bridge with erosion along MSE wall

10 Water probably flowed through horizontal joint

11 Deteriorating panel

12 Another deteriorating panel

13 More deteriorating panels

14 Preliminary inspection program Districts inspected each MSE wall Completed inspections by Jan 20, Walls 30 percent have sand leaking from joints 32 percent have vegetation in joints 19 percent have cracked panels 11 percent have bowed or bulging walls 13 percent have some erosion 9 percent have problems with drainage system

15 MSE wall inspection program OSE will use the information from the preliminary inspections to develop an inspection program. The program will be similar to the bridge inspection program, in that it will include: An inventory An inspection cycle An inspection manual Training and inspector qualification

16 Design changes for MSE walls Preference for certain MSE wall types Abutments supported on spread footings only under certain conditions Consider drainage around MSE walls

17 Preference of wall geometry at bridges 1. Straight walls 2a. Walls turned back up to 45 degrees (change of wall alignment = 135 to 179 ) 2b. Walls turned back with large radius 3. Walls turned back at 46 to 90 degrees Avoid acute corners!

18 Straight MSE wall

19 MSE wall turned back 45 degrees

20 MSE wall turned back with curve

21 MSE wall turned back 90 degrees

22 Avoid acute corners!

23 Bridge abutments at MSE walls In MSE wall plans, include a plan view of the abutment showing all obstructions within the reinforcing zone, such as piling. Support the bridge on piling unless bedrock is near the base of the MSE wall If the bridge is a single span, it may be supported on spread footings or piling. For piling minimum of 3-6 from the back face of the facing panels to centerline of the front row pile For spread footing minimum of 3 from the back face of the facing panels to the front face of the footing

24 Drainage around MSE walls Control of roadway drainage is critical around MSE walls. The major problems with MSE walls have been related to the loss of drainage control. Extend barrier or curb past the MSE wall. Place catch basins beyond the MSE wall, if possible.

25 Supplemental Spec 840 One specification that covers all approved MSE wall systems Added definitions Material specifications for joint cover Greatly expanded construction section

26 Construction of MSE walls Preconstruction meeting Compaction testing of foundation Geotextile with 1 foot of granular at base of MSE wall Detailed description of construction procedure On-site assistance from supplier Do not damage joint cover when applying epoxy sealant.

27 Geotechnical Consultant Geotechnical consultant will inspect the foundation excavation to confirm the recommended allowable bearing capacity (like a footing inspection). Inspection will be paid for through the prime consultant under consultant services.

ODOT Design & Construction Requirements for MSE Walls

ODOT Design & Construction Requirements for MSE Walls ODOT Design & Construction Requirements for MSE Walls Peter Narsavage, P.E. Foundation Engineering Coordinator Ohio Department of Transportation Office of Structural Engineering 2006 Ohio Transportation

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