孔内深层强夯复合地基桩土应力比试验研究  

Experimental Study on Pile-soil Stress Ratio of the Compos⁃ite Foundation with Down-hole Dynamic Compaction

作　　者：吕文龙 林逸峰 付强 LYU Wenlong;LIN Yifeng;FU Qiang(Guangdong Provincial Academy of Building Research Group Co.,Ltd.,Guangzhou 510000,China;School of Civil Engineering,Guangzhou University,Guangzhou 510000,China)

机构地区：[1]广东省建筑科学研究院集团股份有限公司,广州510500 [2]广州大学土木工程学院,广州510006

出　　处：《华南地震》2024年第1期119-125,共7页South China Journal of Seismology

基　　金：住房与城乡建设部科技计划资助项目(2017-k10-006)。

摘　　要：通过开展孔内深层强夯单桩复合地基现场静载试验和桩土应力测试,获取了不同荷载作用下孔内深层强夯复合地基的平均桩顶应力、桩间土应力、桩土应力比、荷载分担比及其变化规律。试验结果表明:孔内深层强夯复合地基的桩间土承担了主要的上部荷载,约占50%~63%,随着荷载增大,桩间土承担的荷载比例逐步增大;对于孔内深层强夯复合地基,随着荷载的增大,桩土应力比随荷载的增大而减小,数值介于2~5之间;对粘性素填土地基,孔内深层强夯复合地基在处理后的桩间土地基承载力比处理前可提高220%。By conducting on-site static load tests and pile-soil stress tests on the composite foundation with down-hole dynamic compaction,the average pile top stress,soil stress between piles,pile-soil stress ratio,load sharing ratio,and their variation patterns of the deep dynamic compaction composite foundation in the hole under different loads were obtained.The test results show that:the soil between piles of the deep dynamic compaction composite foundation in the hole bears the main upper load,accounting for about 50%-63%.As the load increases,the proportion of load borne by the soil between piles gradually increases;for the deep dynamic compaction composite foundation in the hole,the pile-soil stress ratio decreases with the increase of load,with a value between 2 and 5;for foundation with cohesive plain soil filling,the bearing capacity of the deep dynamic compaction composite foundation in the hole after treatment can be increased by 220%compared with that before treatment.

关 键 词：孔内深层强夯 复合地基 桩土应力比 桩间土应力 地基承载力 荷载分担比 

分 类 号：TU473.1[建筑科学—结构工程]