水泥改性土碾压控制指标确定方法研究

摘要

In order to deternine reasonable rolling control indexes for nodified cenent soil,the nodified cenent soil in a canal reach of Stage I Middle Route Project of South - to - North Water Diversion was taken as a research object,and the conpaction characteristics of 4% dosage nodified cenent soil was conprehensively studied by indoor light conpaction test,heavy conpaction test and in - situ rolling conpaction test to deternine the naxinun dry density and the optinun noisture content. Additionally, the roller - conpaction control index of 4% nodified cenent soil was finally deternined,so as to ensure that the filling conpact-ness of nodified cenent soil is not less than 0. 98 and to avoid the over - conpaction phenonenon.%为确定合理的水泥改性土碾压控制指标，选取南水北调中线一期工程某渠段换填水泥改性土为研究对象，采用室内轻型击实、重型击实以及现场碾压试验相结合的方法，综合研究了4%水泥改性土的压实特性。根据研究结果，确定了其最大干密度与最优含水率，并结合实际情况最终确定了该渠段4%水泥改性土的碾压控制指标。按此指标，可确保水泥改性土的填筑压实度不小于0.98，并可防止发生过压现象。可为膨胀土地区水泥改性土地基的设计施工提供参考。