刚性承台群桩沉降简化计算方法  

A practical method for analyzing settlement of pile group with rigid cap

作　　者：吴鹏[1] 龚维明[2] 任伟新[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]东南大学土木工程学院,江苏南京210096

出　　处：《中南大学学报（自然科学版）》2008年第6期1319-1324,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50708115);中国博士后科学基金资助项目(20070410308);中南大学博士后科学基金资助项目(2007年)

摘　　要：基于考虑桩土滑移和桩顶整体刚度动态调整的群桩计算方法,分析平均端阻比与荷载水平、桩土刚度比、桩长、桩径、桩距、桩数以及桩侧、桩端荷载传递函数等因素影响规律,用统计方法拟合端阻比与上述参数的近似表达式。参考等代实体基础计算模式,提出考虑了桩身压缩量和桩端刺入变形的群桩沉降简化计算模式,该方法考虑了沉降与荷载非线性关系。最后,通过离心模型试验验证实用简化计算方法的准确性。研究结果表明:采用简化计算方法所得结果与精确计算方法所得结果以及试验结果均吻合;桩身压缩量和桩端刺入变形不能忽略。Based on the calculating method which considered slip of pile and soil and whole stiffness dynamic adjusting, the reason why average tip resistance ration is affected by load level, stiffness ratio of pile to soil, pile length, pile diameter, pile spacing, pile number and soil mechanical parameters were analyzed. Approximate formula of tip resistance ratio was fitted by statistical method. Referring to equivalent pier method, a simple method of settlement calculating for pile group which considered compression of pile body and stab of pile tip was presented. A centrifuge model test was given to verify the simple method. The results show that the method can consider nonlinear relation between settlement and load. The results agree with those of accuracy method and the test. Compression of pile body and stab of pile tip can＇t be ignored.

关 键 词：刚性承台 超长群桩 等代实体基础 端阻比 荷载水平 

分 类 号：TU473[建筑科学—结构工程]