成都砂卵石地层桩锚支护侧土压力实测分析

为了得出砂卵石地层条件下实际作用于支护结构上的土压力分布模式,基于成都典型砂卵石地质条件的现场监测数据,对深基坑开挖过程中实测土压力进行分析研究。结果表明：砂卵石地层条件下实测土压力呈类波状的非线性分布;桩顶下约3 m范围内实测土压力位于朗肯主动土压力与静止土压力之间;距桩顶约3 m以下的实测土压力远小于朗肯主动土压力;水平位移对圈梁和基底处的土压力的影响很小,并分析了出现这种情况的合理性,对类似深基坑支护体系的设计具有重要的参考价值。

Analysis of Actual Earth Pressure Around Pile-Anchor Supporting Structure in Sandy Cobble Ground of Chengdu

To obtain the distribution pattern of earth pressure acting on the supporting structures in sandy cobble ground,the in-situ monitoring data of earth pressure from a typical deep foundation pit in sandy cobble ground in Chengdu was analyzed.Results show that the distribution pattern of actual earth pressure is non-linear in sandy cobble ground.The value of actual earth pressure of the range of three meters on the top of pile is between the classical Rankine’s active earth pressure and the static earth pressure and the one of the other parts is far less than classical Rankine’s active earth pressure.The influence between the horizontal displacement and the earth pressure on the ring beam and excavation surface is very little.Then the rationality of this occurred situation was analyzed.It has important reference value for supporting system’s design of the similar deep foundation pit.