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为研究煤系地层边坡土体强度随着开挖在风化和雨水条件下衰减规律以及边坡的稳定性,建立了基于流变理论的炭质页岩的长期强度数学模型。通过X衍射实验、干湿循环、电镜扫描试验,从微观结构分析了炭质页岩风化规律,然后通过三轴试验分析不同风化条件下煤系地层土体强度的变化规律。最后通过长期强度模型分析了煤系地层边坡稳定性,其计算结果与实际工况较为吻合。
In order to study the strength of soil in the coal measures strata, the long-term strength mathematical model of carbonaceous shale based on the rheological theory is established with the law of attenuation under weathering and rainwater conditions and the slope stability. Through the X-ray diffraction experiment, the wet-dry cycle and the electron microscope scanning experiment, the weathering laws of carbonaceous shale were analyzed from the microstructure. Then the variation of soil strength under different weathering conditions was analyzed by triaxial test. Finally, the stability of coal measures stratum slope is analyzed by long-term strength model. The calculation results are in good agreement with the actual conditions.