中粗砂改良膨胀土的物理性质试验研究

通过对膨胀土掺加不同比例的中粗砂，开展液塑限试验和击实试验，研究了中粗砂改良膨胀土的液限、塑限和塑性指数变化特性以及击实特性，探讨中粗砂作为膨胀土路基改良剂的可行性。结果表明:随着中粗砂掺量的增加，膨胀土的液限、塑限和塑性指数逐渐降低；最大干密度随着中粗砂掺量的增加呈一元三次函数关系增大，最优含水量则呈一元二次函数关系逐渐减小，最大干密度随最优含水量的增大呈一元二次函数关系减小。

Study on Physical Properties Test of Medium-coarse Sand-treated Expansive Soil

Add medium-coarse sand with different proportions in the expansive soil, and carry out liquid-plastic limit test and compaction test to study the characteristics of the change of the liquid limit, plastic limit and plastic index, and the property of compaction, to find out the feasibility to take the medium-coarse sand as the expansive soil subgrade improver. The result shows that with the increment of medium-coarse sand, the liquid limit, plastic limit and plastic index reduced gradually. With the increment of medium-coarse sand, the maximum dry density increased in one dimensional cubic function, and the optimum water content decreased in unary quadratic function, and the maximum dry density decreased with the increment of optimum water content in unary quadratic function.