布袋注浆桩地基用于软基处理的试验研究

Experiment investigation of bag-grouting-pile composite foundation in soft ground treatment

布袋注浆桩(布袋桩)用于软基加固处理是一项新技术,本文对布袋桩在沿海软土地基处理中的应用效果进行试验研究。通过埋设分层沉降管、测斜管,测试布袋桩复合地基深层沉降和路基边缘的深层水平位移,探讨其加固效果。研究表明:采用布袋桩复合地基处理方法,其地基沉降随荷载增加而增加,上部土体沉降量较下部沉降量大;深层土体的水平位移小,表层土体水平位移较大;地基沉降最大值和水平位移最大值均发生在地表以下1.5-2m,说明该段土层扰动最大。

Bag-grouting-pile is a new technique in reinforcing railway soft foundation. The paper discuss the effect of baggrouting-pile used in Coastal soft foundation, and test the deep subsidence as well as deep horizontal displacement of bag-groutingpile composite foundation and high-pressure-jet-grouting pile composite foundation. Through the Contrast of the two ways, it further discuses the reinforcing effect of bag-grouting-pile technique. The research comes to this conclusion： using the method of composite foundation treatment with bag-grouting-pile, the settlement of the upper soil increases with the increase of the load, and the settlement of the upper soil is larger than that of the lower part; the horizontal displacement of the deep soil is small and the horizontal displacement of the surface soil is larger; the maximum displacement and level settlement are located in 1.5-2m below the surface, which indicate that this soil layer disturbance is the largest.