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Abstract It is well known there are many factors influencing the shaft resistance of rock-socketed pile. Statistics indicate that the shaft resistance of rock-socketed pile has a tendency to increase when the bearing capacity of the layer under the pile is high. This paper tries to calibrate the factors influencing the shaft resistance of the pile by direct shear test. In the test，the shear rate is controlled to simulate the settlement velocity of piles；and also soil contact relationship is considered. Main results are shown as follows：(1) Subsidence velocity of pile is manly affected by the strength of the layer under the pile. Settlement rate of the pile is greater when the layer is soft，then interaction between soil and pile will spread along interface layer. (2) The shaft resistance along the pile shows characteristics of hardening when the bearing layer is hard. The greater thickness of soil layer around the pile (which will produce greater lateral earth pressure)，the more significance of hardening will show. (3) The contact relationship of the strata around the pile will play importance role in the shaft resistance. Under larger lateral pressure around the pile，the side resistance may produce a superimposed effect，and thus is greater than that calculated by shear strength according to the theoretical formula.
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Received: 13 August 2013
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2014, Vol. 33 
