土工格栅复合夯实水泥土桩-土界面接触特性分析

针对桩-土接触面的摩擦特性,在夯实水泥土桩-土界面中设置土工格栅,以增强夯实水泥土桩-土的相互作用。采用三维数值软件模拟直接剪切试验和静载试验,对土工格栅复合夯实水泥土桩-土界面接触特性进行分析,研究土工格栅复合夯实水泥土桩-土接触面的应力、变形和强度的变化规律。结果表明:土工格栅复合夯实水泥土桩-土接触界面的摩阻力峰值有所增加,达到峰值后,摩阻力曲线下降速率缓慢;静载试验中,在夯实水泥土桩表面复合土工格栅后,对应的基础沉降比普通夯实水泥土桩复合地基的沉降小,且夯实水泥桩的轴向压缩变形也小。

Study on the Contact Characteristics of Geogrid Composite Cement Soil Pile-Soil Interface

Aiming at the interface friction traits of pile-soil, arranges the geogrid in the compacted soil cement pile - soil interface to enhance the interaction between rammed cement-soil pile and soil. Applies 3D numerical software to simulate direct shear test and static load test, analyzes the contact surface stress, deformation and intensity variation for the geogrid composite cement-soil pile and soil. The results show that the interface peak frictional resistance will increase, and the frictional resistance curve declines slowly when reaching the peak value; In the static load test, with geogrid around the pile, the corresponding subgrade settlement is smaller than that without geogrid, and the pile axial deformation is much smaller.