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在软土地基上修建高等级公路中 ,桥头跳车问题是一个技术难题。在国内目前解决这一问题常用方法是采用粉喷桩处理桥头软基 ,以达到减小差异沉降的目的。本文介绍了在杭州市绕城高速公路 (北线 )桥头粉喷桩处理中进行的地表沉降、分层沉降、水平位移、孔隙水压力、土压力、桩身应变等项目的现场测试成果 ,并以此对粉喷桩作用机理及其处理效果进行分析。
The construction of high-grade highways on soft soil found that the problem of jumping at the bridgehead is a technical problem. At present, the common method to solve this problem in China is to treat the bridgehead soft foundation with DJM to reduce the differential settlement. This paper introduces the field test results of surface subsidence, stratification and settlement, horizontal displacement, pore water pressure, earth pressure, pile strain and other projects in the process of DJM pile treatment at Hangzhou Ring Expressway (North Line) In this way, the mechanism of DJM and its treatment effect are analyzed.