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研究目的:通过中等膨胀土扰动击实样品的不同干湿循环路径,进行1~12次的干湿循环试验,探讨抗剪强度、膨胀率、膨胀力与干湿循环路径、循环次数的关系,明确干湿循环的试验条件以及干湿循环特征循环参数,从而为膨胀土边坡稳定性分析提供干湿循环试验依据。研究结论:(1)中等膨胀土扰动击实试样的干湿循环试验,随着干湿循环次数的增加,抗剪强度随之减小,经过5次干湿循环后,抗剪强度收敛趋于稳定;(2)经干湿循环后,膨胀土的膨胀率和膨胀力均具不可逆性,随着干湿循环次数增加而随之减小,5次干湿循环后膨胀率和膨胀力收敛趋于稳定,5次干湿循环可以作为干湿循环试验的特征循环参数;(3)本研究成果可作为干湿循环的标准试验方法,为膨胀土边坡稳定性分析提供依据。
The purpose of this research is to investigate the relationship between shear strength, expansion rate, swelling force and wet-dry circulation path and circulation times by performing wet-dry circulation test of 1 to 12 times by different wet and dry circulation paths of medium- The test conditions of the wet-dry cycle and the cycle parameters of the wet-dry cycle are clarified to provide experimental basis for the stability analysis of the expansive soils. The conclusions are as follows: (1) The wet-dry cycle test of medium-expansive soil disturbance compaction samples decreases with the increase of the number of wet-dry cycles. After 5 times of wet-dry cycles, the shear strength converges (2) After the wet-dry cycle, the expansibility and expansive force of expansive soil are both irreversible. With the increase of the number of dry-wet cycles, the expansibility and expansive force decrease. After 5 cycles, the expansibility and expansive force converge (3) The results of this study can be used as a standard test method for wetting and drying cycles to provide the basis for the stability analysis of expansive soil slopes.