复合地基变刚度调平设计研究  

Study on variable rigidity design of composite foundation

作　　者：王伟[1] 王士杰[2] 朱常志[2] 张毅[3] 

机构地区：[1]河北建设勘察研究院有限公司,河北石家庄050031 [2]河北农业大学城乡建设学院,河北保定071001 [3]中国矿业大学(北京)力建学院,北京100083

出　　处：《四川建筑科学研究》2010年第3期101-105,共5页Sichuan Building Science

摘　　要：基于数值模拟,对比分析了6种变刚度复合地基模型的不均匀沉降、桩顶反力、土反力、筏板内力;比较了变桩长、变桩径和变桩间距等方法实现复合地基变刚度调平的效果,并进行优化布桩分析。研究表明:基础差异沉降随荷载的增加先增大后减小;变桩长、变桩距相结合的方案有利于改善筏板的内力状况,降低筏板的弯矩,减小不均匀沉降,为最理想的调平方案。By numerical analysis software,we analyse the settlement,soil reaction force,pile top vertical reaction force and the raft＇s inner force,discuss the effect of variable rigidity design by changing the length,space and diameter of pile.Research shows that：The settlement of raft foundation was＂butterfly＂distribution.With the increase of load,the differetial settlement increase in first and then decrease.The model of combining the change of length with space of the pile will improve the state of the raft＇s inner force,decrease the raft moment,this is the best model of variable rigidity design.

关 键 词：复合地基 变刚度 差异沉降 数值分析 

分 类 号：TU470.3[建筑科学—结构工程]