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为研究重庆市长江边某地砂岩、砂泥岩、泥岩在往复剪切条件下的强度变化规律,通过控制砂泥岩颗粒配合比,分别在100、200、300、400kPa的法向应力条件下进行8次循环往复剪切试验。结果表明,随往复剪切次数的增加,三种试样的峰值剪切强度整体均呈减小趋势,且砂岩的峰值剪切强度最大,泥岩的剪切强度最小;三种岩石试样的抗剪强度指标变化规律总体一致,粘聚力先增后减,内摩擦角逐渐减小;砂岩的残余粘聚力最小,残余内摩擦角最大,泥岩的残余粘聚力最大,残余内摩擦角最小。结果可为工程实践中土料的选取提供参考。
In order to study the variation of strength of sandstone, sandstone and mudstone in a certain place along the Yangtze River in Chongqing, under the conditions of reciprocating shear, by controlling the mixing ratio of sand and shale particles, respectively, under the normal stress conditions of 100, 200, 300 and 400kPa Cyclic reciprocating shear test. The results show that the peak shear strength of the three specimens decreases with the increase of the number of reciprocating shearing, and the peak shear strength of sandstone is the largest and the shear strength of mudstone is the smallest. The shear strength index changes are generally the same, the cohesion increases first and then decreases, the internal friction angle decreases gradually; the residual cohesion is the smallest, the residual internal friction angle is the largest, the residual cohesion is the largest, the residual internal friction angle is the smallest . The results can provide reference for the selection of soil materials in engineering practice.