Experimental Study of Model Piles Socketed into Rock with a Hanging Base
by Ningzhong Xi, (Institute of Foundation Engineering, China Academy of Building Research, Beijing, 100013, China), Jinli Liu, (Institute of Foundation Engineering, China Academy of Building Research, Beijing, 100013, China), and Hong Yang, (Parsons Brinckerhoff, 303 2nd St, 700N, San Francisco, CA 94103, USA. E-mail: yangh@pbworld.com)
Section: Section 2: Deep Foundations, pp. 135-142, (doi: http://dx.doi.org/10.1061/41106(379)16)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
Deep Foundations and Geotechnical In Situ Testing |
| Abstract: |
To investigate the effect of pile-rock adhesion condition and rock stiffness on both socket friction in rock and side friction in the overlying soil of piles socketed into rock, pile load tests were performed on four instrumented model piles with hanging bases (i.e. the pile ends were unsupported). Cement grout and lean concrete were used to simulate strata of weak and hard rock, respectively; and slurries of different concentrations were applied to the pile-rock interfaces to simulate different pile-rock adhesion conditions. The overlying soil layer was comprised of compacted silt. The load test results indicate that the side resistance of the piles in the soil layer could fully develop even when the pile tip displacement was relatively small; the side resistance distribution was of a saddle shape in general with higher values at the top and bottom and lower values in middle of the soil layer. |
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