大直径嵌岩灌注桩水平荷载试验研究

The Study of Lateral Load Test of Large-diameter Rock-socket Piles

桩在水平荷载作用下的受力性状是一个复杂的桩土相互作用过程。本文结合工程实例,通过现场水平静载试验,实测得到了水平荷载作用下大直径嵌岩灌注桩桩土共同作用时的工作性状,分析了桩体水平力、位移与时程关系、水平力与位移梯度关系、临界承载力以及地基土的水平抗力比例系数。试验结果可为今后同类桩的设计与研究提供参考。建议采用位移控制设计桩基础。

The behavior of pile under lateral load is a very complex process of pile-soil interaction. The interaction behavior of large-diameter rock-socket bored piles on lateral load is analyzed by field test. The relationships of lateral load-time-lateral displacement （ H0 - t - X0 ） and lateral load-displacement gradient （ H0 - （X0/H0））, the critical bearing capacity and lateral modulus of subgrade reaction m can be obtained from the test results. These experiment results are useful for the practical analysis of the same piles. The method of displacement control is suggested to be applied for pile foundation design.