在软黏土(黄土质粉质黏土、粉土和粉质黏土)地基上做了路基施工的离心模型试验研究,重点探讨了在水泥搅拌桩法加固处理后地基的沉降随时间的变化关系、基底应力分布规律、地基加固效果等.得到如下结论:①提出了水泥搅拌桩法加固处理地基离心模型试验的设计及模型制作方法.②由水泥搅拌桩加固处理的试验结果可知,水泥搅拌桩处理后的地基在施工期间可以完成大部分沉降,能够有效减少工后沉降,对工后沉降要求比较严格的工程而言,水泥搅拌桩法加固处理地基是一种有效的加固工法.③通过有限元计算,得出其结果可以作为在工程设计、施工时推导总沉降量的参考.%Centrifugal model test of roadbed construction on soft clay ( loess silty clay, silty soil and silty clay ) is studied in this paper. Foundation settlement variation together with time, basal stress distribution and foundation reinforcement effect are discussed. Centrifugal model test design and method of foundation reinforced by cement mixing pile are put forward. According to the result of reinforcing treatment by cement stirring pile, most of foundation settlement can be finished during construction period after the foundation is reinforced by cement mixing pile. The foundation settlement after construction can be effectively reduced. The method of foundation reinforcement with cement mixing pile is very effective especially for the engineering with more stringent requirements for the foundation. The finite element calculation result can be used in derivation of the total settlement in engineering design or construction.
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