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膨胀土具有遇水膨胀、失水收缩的工程特性,掺加一定量水泥对其进行改性是处理膨胀土的主要方法之一。选取引江济淮工程弱膨胀土,通过对素膨胀土和改性土的自由膨胀率、界限含水率及无侧限抗压强度的试验分析,揭示了水泥掺量和养护日期对引江济淮工程弱膨胀土的物理力学性质的影响。试验结果表明:(1)随掺灰率的增加,改性膨胀土的自由膨胀率、液限、塑性指数均降低,无侧限抗压强度增加;(2)随养护日期的增加,自由膨胀率、液限、塑性指数减小,无侧限抗压强度增大;(3)基于本研究试验结果,同时综合考虑工程实际,建议引江济淮工程弱膨胀土水泥改性剂量为4%。
Expansive soil with water swelling, water loss and shrinkage of the engineering properties, mixed with a certain amount of cement to be modified to deal with expansive soil is one of the main methods. The weak expansive soil of the Yangtze-Huaihe River-Huaihe River project is selected. Through the analysis of the free expansion rate, the limit moisture content and the unconfined compressive strength of plain expansive soils and modified soils, the influence of cement content and curing date on the weak expansions The Influence of Soil Physical and Mechanical Properties. The results show that: (1) With the increase of ash mixing rate, the free expansion rate, liquid limit and plasticity index of modified expansive soil decrease and unconfined compressive strength increase; (2) Free expansion (3) Based on the results of this study, taking into account the actual engineering practice, it is suggested that the amount of cement modified by weak expansive soil in the Yangtze River to Huaihe River project should be 4%.