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APPENDIX C EXAMPLE LOAD TEST RESULTS AND INTERPRETATION AND DETERMINATION OF P-Y CURVES An instrumented lateral load test program was reported by Nusairat et al. (2006) for design of drilled shafts in rock fora two-span reinforced concrete rib arch bridge project on the Stillwater River in Dayton, Ohio. The results of that test are used as an example for p-y curve generation. Information from the testis summarized herein as needed to support the example p-y curve generation
refer to the report by Nusairat et al. (2006) for full details of the test program and results.
C.1 SUBSURFACE CONDITIONS ATTEST SITE The surficial soils at the test site are Quaternary glacial deposits that are generally less than 30 feet in thickness. The underlying bedrock comprises limestone and shale of the Richmond Formation. Figure C illustrates the logs from borings Band B that were drilled near the site of the lateral load test. Boring Bis the closer of the two borings to test site. Fill was found to a depth of 3.5 feet and 8 feet at Band B respectively. The fill was underlain
by natural fine grained soils, namely sandy silt,
silt and clay, and silty clay. Auger refusal occurred at depths of 13.5 feet and 24 feet in borings Band B respectively. The rock below the refusal depth was cored to depths of 28.5 feet and 40 feet, respectively. The rock is soft to medium gray shale inter-bedded with hard gray limestone layers less than 1 foot in thickness. The shale is slightly weathered to decomposed,
weakly calcareous, thinly laminated,
and broken to very broken, becoming massive near the completion depth of the borings.
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