Improvement of Engineering Properties of High Liquid Limit Soil for Subgrade Filling
In view of the settlement,cracking,landslide and other problems in the process of high liquid limited soil in the actual sub-grade filling,analyzed common physical and chemical modification methods,soil test of high fluid soil limiting subgrade of Shanghai-Chongqing Expressway,and the experimental study of sand mixing improvement,the CBR value and water content of high fluid limit soil before and after sand mixing are compared and analyzed.It is concluded that:(1)Adding a certain amount of sand to the high liq-uid limiting soil can improve the adverse engineering characteristics of the high liquid limiting soil itself,sand mixing rate in about 20%of the best effect;(2)Subgrade filling and compaction at the corresponding water content at the maximum CBR value,at this time,the moisture content is slightly greater than the optimal moisture content,close to the equilibrium moisture content.The moisture content of the subgrade will not change greatly in the following use stage,thus,the expansion amount of the subgrade will not exceed the allowable range,ensure that the subgrade structure strength value does not change greatly.
high liquid limited soilsubgrade fillingsand mixing and improvement
NETL
NSTL
万方数据
维普
