碎石桩灰土桩复合地基桩土应力比的试验研究

Experimental study on stress ratio of pile to soil with gravel pile and lime-soil pile composite foundation

在实验室条件下,用碎石或灰土圆柱芯增强体与粘性土组成的复合地基单位桩模型,模拟试验现场碎石桩和灰土桩的工作状态,探讨桩土复合体的变形模量比与桩土应力比之间的关系。大量的试验结果表明:无论是在水平方向还是纵向,复合体的变形模量和强度都不是两种材料按一定几何比例的简单叠加;两种材料变形模量的比值也不能反映复合试样中的桩土间的应力分配。

Under the laboratory conditions, by using unit pile model of composite foundation which is made up of gravels or lime soil cylindrical core reinforcement, a simulation test of working condition of site gravel pile and lime-soil pile was conducted, the relation between the deformation modulus of pile-soil composite and pile-soil stress ratio was discussed. Many test results showed that both lateral or vertical deformation modulus and strength of the composite sample can not be obtained by adding that of reinforcing pile and soil together simply in accordance with the geometric proportion. The deformation modulus ratio of the two materials can not reflect the stress distribution among the pile soil of composite samples.