变刚度布桩复合地基模型试验研究

以模型试验方法研究了变刚度复合地基的承载特征、沉降分布、变形影响范围、桩土荷载分担比及基桩荷载传递特性。试验数据表明:在荷载较大的核心筒区密集布桩而在荷载较小的边角区稀疏布桩或不布桩,能有效地减少基础沉降差,同时减少基桩工程量,复合地基筏下布桩的平均桩顶反力应小于基桩的单桩极限承载力以保证基础总体沉降满足安全要求。

Experimental study on composite piled raft foundation

The behaviors of composite piled foundation with variable stiffnesses are studied by experiments,such as load– settlement relation,settlement pattern,effect scope,load sharing and interaction between piles and soil.The differential settlement and volume of piles can be reduced efficiently when the raft is piled more in high loading zone and less in low loading zone or no.The general settlement can be satisfied when the average reaction of piles under the raft is lower than the maximum bearing capacity of the single pile.