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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。
Pipe pile cement-soil composite pile is a new composite pile suitable for soft ground. In order to study the variation law of pile circumference stress field with time and space caused by soil compaction effect during the construction of the composite pile, the horizontal stress and pore water pressure of the pile side were measured with engineering examples. The test results show that the stress field of the soil around the pile during the construction process of cement powder spray pile changes significantly. The stress of soil around the pile is released by the construction of the powder injection pile, effectively reducing the squeezing effect of the pipe pile with static pressure pile. The maximum pore pressure was reached when the test point elevation was reached. The vertical influence range of pile squeezing was about 1.83-2.67 times the pile sinking depth. The excess pore pressure ratio during pile sinking was approximately linear with the increase of the distance from the pile center Small, squeezing soil over pore pressure of about 8 times the impact of pile diameter.