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针对降雨和库水位升降对库岸边坡消落带岩体力学参数的劣化问题,选取泥质砂岩进行不同p H水环境干湿循环作用下的单轴与三轴压缩试验,结合室内试验结果,应用广义Hoek–Brown准则求得不同地质强度指标评分(GSI)下岩体的单轴抗压强度、弹性模量、材料常数和黏聚力。研究表明:破碎程度越大的泥质砂岩受浸泡的溶液酸性越强、干湿循环次数越多,其力学参数劣化程度就越高;在同一个GSI评分下,泥质砂岩各个力学参数随p H值和干湿循环次数n的劣化效应排序有所差异,综合劣化效应最大为弹性模量,累积劣化效应最明显为黏聚力,其劣化系数与浸泡溶液的p H值、干湿循环次数的对数ln(n)成线性相关。基于上述研究提出了泥质砂岩力学参数与p H值、干湿循环次数n的三维劣化方程,为酸性环境干湿循环作用下现场岩体力学参数的获取以及边坡稳定性寿命的预测提供了理论依据。
In view of the deterioration of mechanical parameters of rock mass in the up-and-down belt of bank slope due to rainfall and elevation of reservoir water level, the uniaxial and triaxial compression tests of muddy sand under different wet and dry cycles of p H water environment were selected. Combining with the indoor test results The uniaxial compressive strength, elastic modulus, material constant and cohesion of rock mass under different GSI were calculated by using generalized Hoek-Brown criterion. The results show that the sharpening degree of the shaly sands is more acidic and the wetting and wetting cycles are more, the higher the degree of mechanical parameters degradation is. Under the same GSI score, the mechanical parameters of the shaly sands vary with p The value of H and the number of wetting and drying cycles n are different, and the maximum effect of comprehensive degradation is elastic modulus, and the cumulative effect of degradation is the cohesive force. The coefficient of degradation and p H value of soaking solution, the number of wet and dry cycles The logarithm of ln (n) is linearly related. Based on the above study, the three-dimensional degradation equations of mechanical parameters and p H values of wet shale sand and number of wet and dry cycles n are proposed. The three-dimensional degradation equations of mechanical parameters of rock shale and prediction of slope stability life are provided under the wet and dry cycling of acidic environment Theoretical basis.