边载作用下CFG桩复合地基性状分析  

Bearing Capacity Analysis of Composite Foundation under Surcharge

作　　者：李春灵[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所

出　　处：《建筑科学》1999年第4期19-23,共5页Building Science

摘　　要：在考虑对复合地基进行深度修正时，需要了解边载作用下复合地基的承载性状。本文通过有无边载作用下，ＣＦＧ桩复合地基承受竖向静载试验的对比，分析了边载对复合地基的影响，边载的作用主要是提高桩间土的承载力，而对桩的承载力影响不大，同时桩土荷载分担比也受边载影响。本试验结果说明，对于强度较高的土适当提高复合地基深度修正系数是可行的。To evaluate the additional influences of embankment depth when calculating the design vertical bearing capacity, it is necessary to analyze the surcharge's effect. Based on a comparison of loading test of CFG (Cement, Fly ash, and Gravel) pile composite foundation with and without surcharge, this paper analyzes surcharge's effect. The results of the test show that surcharge will mainly contribute to enhance soil's bearing capacity and will not influence pile's bearing capacity remarkably. The percentage of load shared by soil and pile with surcharge is different from that without surcharge. The test also proves that modest enlargement of the depth modification factor of composite foundation bearing capacity, which is 1.0 specified in current design code, is applicable.

关 键 词：CFG桩 复合地基 边载 承载力 深度修正 

分 类 号：TU472.35[建筑科学—结构工程]