摘要
管桩水泥土复合桩是适用于软土地基的一种新型复合桩。为研究该复合桩施工过程挤土效应引起的桩周应力场随时间、空间的变化规律,结合工程实例,对其进行桩侧水平应力及孔隙水压力测试。试验结果表明：水泥粉喷桩施工过程中桩周土体应力场显著变化;粉喷桩施工造成桩周土体应力释放,有效减小了管桩静压沉桩挤土效应;管桩桩端到达测点高程时产生的超孔压最大,沉桩挤土竖向影响范围约为1.83~2.67倍沉桩深度;沉桩过程中超孔压比随距桩心距离的增加而近似呈线性规律减小,挤土产生超孔压的影响范围约为8倍管桩外径。
The composite pile made up of jet-mixing cement and PHC pile with core concrete（ CPCP） is a new kind of composite pile used in soft ground engineering. Combined with the engineering project,the pile lateral horizontal stress and pore water pressure tests were done to study the change rule of pile side stress field over time and space caused by compaction effect of composite pile during construction process. It is found that the pile side soil stress field has significant change during the construction process of cement pile. The cement-soil construction can cause pile side soil stress release and effectively reduce the compacting effects of jacked pile.The increment of excess pore water pressure reaches the maximum when the pile tip arrives at the test points position and the vertical scope of influence is about 1.83 ~ 2.67 times of pile-sinking depth. The excess pore water pressure decreases linearly with the increase of the distance to the pile and the effecting area is about 8 times of pipe pile diameter.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第3期601-606,共6页
Chinese Journal of Underground Space and Engineering
关键词
复合桩
静压沉桩
孔隙水压力测试
挤土效应
现场试验
composite pile
jacked pile
pore water pressure test
compacting effect
field test
