United States Department of Transportation
i
Soil nailing of a bridge embankment : report 2 : design and field performance report.
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1995-07-01
[PDF-9.51 MB]
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Abstract:Soil nailing has recently been introduced in Oregon as an alternative lateral earth support method. The first permanent soil nail wall on the state's highway system was used where an underpass was widened under the existing Oregon Slough Bridge in Portland, Oregon to provide for additional travelling lanes. The project required removal of the existing south end slope and the construction of a soil nail wall in front of the pile-supported end bent to permanently retain the existing bridge fill embankment. Construction and post-construction monitoring was performed to study the new wall's performance.
This report describes the design and the performance of the Interstate-5 soil nail wall. The instrumentation program implemented during the construction of the wall is discussed in detail. The instrumentation data at two vertical cross sections is presented and data interpretation is discussed. The performance predicted by the original design methodology is compared critically to the measured.
Based on the results of our study, it may be concluded that: a) the Interstate-5 Swift-Delta soil nail wall is performing well within structural limits for both the wall and the bridge abutment, b) tensile forces are maximum inside the soil nailed earth mass at some distance from the facing, c) a relative movement in the range of 1/8 to 1/4 inch (3.18 MM to 6.34 MM) is necessary to mobilize the tensile capacity of the soil nails, d) the Davis method overstimates the nail forces in the lower nails and understimates the nail forces in the upper nails, and e) Terzaghi and Peck's braced cut empirical earth pressure diagram appears to be in reasonable agreement with measured loads to date.
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