考虑地下水作用的Goodman-Bray方法改进及应用

反倾岩质边坡的稳定性分析方法一般为Goodman-Bray法,但其没有考虑地下水。对Goodman-Bray法进行改进,推导出了考虑地下水作用的反倾岩质边坡稳定性计算方法,并用MATLAB编写了计算程序。最后以重庆巫溪县中梁水库硝洞槽-郑家大沟反倾岩质边坡为例,采用Sarma法和传递系数法(TCM)对改进的Goodman-Bray法(简称WGB法)进行验证。结果表明:反倾岩质边坡往往受自身岩体结构的控制,条块划分结合结构面产状的Sarma法和WGB法比铅直方向条分的TCM法更符合实际情况,但Sarma法忽视了对条块底面连通性的考虑,使计算结果偏低。综合比较3种计算方法,WGB法更加适用于考虑地下水作用的库岸反倾岩质边坡稳定性分析。

Improved Goodman-Bray Method in Consideration of Groundwater Effect

Goodman-Bray Method is commonly used in the stability analysis for toppling rock slope,but the effect of groundwater is not considered.In view of this,we made an improvement to the Goodman-Bray method by deducing the stability calculation of toppling rock slope in consideration of groundwater effect,and wrote calculation program by using MATLAB.With a toppling rock slope in Wuxi,Chongqing City as a case study,we verified this improved Goodman-Bray method using Sarma Method and Transferring Coefficient Method (TCM)for comparison.Results suggest that the improved Goodman-Bray method and Sarma Method which combines rock block and structural planes could better reflect the practical situation than TCMbecause of the limits of toppling rock mass.But the con-nectivity of block bottom is neglected by using Sarma Method so that the calculation result is smaller than practice. So this improved Goodman-Bray method is more suitable to be used for stability analysis of toppling rock slope in consideration of groundwater effect.