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基于土体Mohr-Coulomb准则做了重塑土直剪试验,获得了不同含水率和干湿循环次数下粘性土抗剪强度参数及其变化规律,即随着含水率的增加,粘聚力先增大后减小,内摩擦角逐渐减小;随着干湿循环次数的增加,粘聚力先剧烈下降后趋于稳定,内摩擦角变化较小;含水率和干湿循环次数的增加,均使得土体抗剪强度降低。将试验结果应用于边坡稳定性计算中表明,含水率增加会导致边坡稳定性系数急剧下降,干湿循环次数增多也会导致边坡稳定性下降,但循环5次后,边坡稳定性基本保持不变。
Based on the soil Mohr-Coulomb criterion, the direct shear tests of remolded soil were done, and the shear strength parameters and the changing rules of clay under different moisture content and wetting and drying cycles were obtained. With the increase of water content, With the increase of the number of drying and wetting cycles, the cohesion decreases sharply and then tends to be stable, the variation of internal friction angle is small; the moisture content and the number of wet and dry cycles increase, All the soil shear strength is reduced. Applying the test results to the calculation of slope stability shows that the increase of moisture content will cause the slope stability coefficient to drop sharply and the increase of the number of wet and dry cycles will also lead to the decline of slope stability. However, after 5 cycles, the slope stability Maintain unchanged.