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基于实验所得数据及合理假设,采用了最小二乘法数学理论,研究了应力与强度参数的变化规律.结果表明:随着剪切面积的减小,使得每块岩样的正应力与剪应力同比例增大,对强度参数产生影响;在硬岩结构面直剪实验中,剪切面积的改变量与剪切位移呈线性关系,并且相同剪切位移条件下,低竖直压力的面积改变量大于高竖直压力的面积改变量;剪切面积的减小,对凝聚力的影响大于对内摩擦角的影响,内摩擦角基本保持不变.通过实例进行验证,内摩擦角相对误差为0.72%,而凝聚力相对误差为4.14%.
Based on the experimental data and the reasonable assumption, the least-squares mathematical theory was used to study the variation of stress and strength parameters.The results show that with the decrease of shear area, the normal stress and shear stress of each rock specimen are the same In the direct shear test of hard rock, the change of the shear area has a linear relationship with the shear displacement, and under the same shear displacement, the area change of the low vertical pressure Which is larger than the change of area under high vertical pressure. The decrease of shear area has more influence on the cohesion than that of the internal friction angle, and the internal friction angle remains basically unchanged. The relative error of internal friction angle is 0.72% , While the relative error of cohesion was 4.14%.