球状风化体混合花岗岩边坡稳定性分析  

Stability of Mixed Granite Slope with Spherical Weathering Body

作　　者：李勇 陈玮龙 许方党 周春梅 LI Yong;CHEN Weilong;XU Fangdang;ZHOU Chunmei(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430070,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,湖北武汉430070

出　　处：《安全与环境工程》2023年第1期119-127,共9页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(50874080、40672187);武汉工程大学校研究生教育创新基金项目(2020124)。

摘　　要：为准确地分析球状风化体混合花岗岩边坡的稳定性,采用传统极限平衡法,考虑球状风化体含量为0%~40%共9种不同情况,利用GeoStudio软件中的SIGMA/W模块和SLOPE/W模块研究了球状风化体含量、直径和位置对混合花岗岩边坡稳定性的影响。结果表明:随着球状风化体含量的增加,混合花岗岩边坡的稳定性系数增加,边坡最危险滑动面向深部发展;当球状风化体的直径逐渐增大时,混合花岗岩边坡的滑动面深度会由深变浅,其稳定性系数会逐渐减小,但变化幅度不大;球状风化体的位置分布对混合花岗岩边坡稳定性的影响较大,当球状风化体分布在混合花岗岩边坡的上部时边坡的稳定性系数最小,分布在混合花岗岩边坡的中部时边坡的稳定性系数次之,分布在混合花岗岩边坡的下部时边坡的稳定性系数最大,球状风化体分布在混合花岗岩边坡浅层时边坡的稳定性系数比分布在边坡深层时大,球状风化体位置分布对混合花岗岩边坡稳定性具体的影响关系表现为:边坡下部>边坡中部>边坡上部,边坡浅层>边坡深层;与无孤石边坡对比,加入孤石以后,边坡最危险滑动面会随着孤石的加入而改变,呈现明显的绕开孤石的效应。该研究成果可为混合花岗岩边坡的设计和治理提供理论参考。In order to accurately analyze the stability of the mixed granite slope with spherical weathering body, the traditional limit equilibrium method is adopted to study the influence of boulder content and diameter on the stability of the mixed granite slope by using SIGMA/W and SLOPE/W of GeoStudio, in consideration of 9 different situations with spherical weathering body content of 0%-40%.The results show that with the increase of the content of spherical weathering body, the stability coefficient of the slope increases, and the most dangerous sliding surface of the slope develops towards the deep;when the diameter of the spherical weathering body increases gradually, the sliding surface depth of the mixed granite slope changes from deep to shallow, and its safety factor gradually decreases, but the change range is small;the distribution of spherical weathering body has a great influence on the stability of the mixed granite slope, as the stability coefficient of the slope distributed in the upper part of the granite slope is the smallest, followed by that in the middle part, and the stability coefficient of the slope distributed in the lower part is the largest, and the stability coefficient of the slope distributed in the shallow layer is larger than that of the slope distributed in the deep layer.The specific influence of location distribution on the stability of the mixed granite slope is: lower part>middle part>upper part, shallow layer>deep layer;compared with the slope without boulders, the most dangerous sliding surface of slope with boulders change with the addition of boulders, showing an obvious effect of bypassing boulders.The research results can provide a theoretical reference for the design and analysis of the mixed granite slope.

关 键 词：球状风化体 混合花岗岩边坡 球状风化体含量 球状风化体直径 球状风化体位置 边坡稳定性 

分 类 号：X43[环境科学与工程—灾害防治] TU457[建筑科学—岩土工程]