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含水率变化时膨胀土湿胀干缩引起裂隙开展,裂隙的形态特征影响着膨胀土强度、渗透及变形性能。基于弹性力学理论,采用湿变量代替基质吸力来研究膨胀土的应力和变形特性,推导考虑湿变量的膨胀土湿变应力解析解;结合静力平衡条件和饱和土抗剪强度理论,建立基于湿变量的膨胀土初始裂隙模型,获得脱湿条件下膨胀土初始裂隙深度、间距和宽度的定量表达式;通过裂隙开展试验结果与模型计算结果对比分析,验证模型的合理性;最后对裂隙间距和宽度与土体弹性模量、收缩系数、湿变分布系数和凝聚力的关系进行了敏感性分析。
When the moisture content changes, the expansive soil swells and shrinks and shrinks and causes the crack to carry out. The morphological characteristics of the crack affect the strength, infiltration and deformation performance of the expansive soil. Based on the theory of elastic mechanics, the stress and deformation characteristics of expansive soils are studied by using wet variables instead of matrix suction, and the analytical solutions of wetting stress of expansive soils considering wetting variables are derived. Based on the static equilibrium conditions and the theory of saturated soil shear strength, The initial expansive soil model of expansive soil is obtained, and the quantitative expression of initial crack depth, spacing and width of expansive soil under dehumidifying condition is obtained. The comparison between the experimental results and model calculation results verifies the rationality of the model. Finally, Width and soil elastic modulus, shrinkage coefficient, wetting distribution coefficient and cohesion of the sensitivity analysis.