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测量岩石的黏聚力和内摩擦角是非常重要的,而测量得出的数值可信度到底有多高也是值得关注的。通过取若干组试件达到极限破坏状态时的法向力σ和切向力τ,建立σ关于τ的一元线性回归方程,并编写了相应程序解得最佳c、φ值,进一步对回归方程进行检验,最终发现当取显著性水平α≥0.005时,τ与σ之间有线性关系,当取显著性水平α≤0.001,无线性关系,结果表明得到的φ,c值都是在一定的可信度下。由此可见必须选取最合适的可信度,以得到最佳的c、φ值。
It is important to measure the cohesion and internal friction angle of the rock, and it is worth noting how high the numerical confidence measures are. By taking the normal force σ and the tangential force τ at the ultimate failure condition of several specimens, a linear regression equation of σ with respect to τ was established and the corresponding programs were solved to obtain the optimal values of c and φ. The regression equation Finally, we found that there is a linear relationship between τ and σ when taking the significance level α≥0.005. When taking the significance level α≤0.001, there is no linear relationship, and the results show that the values of φ and c are all constant Credibility. This shows that we must choose the most appropriate confidence in order to get the best c, φ value.