摘要
危岩体是被结构面围限并受空间力系作用的三维地质体。二维稳定性计算模型分析结果往往不能反映其真实的稳定性。基于空间解析几何和极限平衡法,提出了一种可考虑周围岩体夹持作用的滑移式危岩三维稳定性计算方法。该方法首先根据结构面的空间几何分布建立各自的局部坐标系,分别计算结构面分离区和锁固区的空间受力,然后将局部坐标系中力变换至主滑面坐标系,求得下滑力和抗滑力后计算危岩体稳定性系数。
Unstable rock mass is a three-dimensional geological body constrained by structural planes and acted by spatial forces.In most cases,the stable state of the unstable rock masses can not be veritably mirrored by the analysis results of two-dimensional stability calculation models.Based on the space analytic geometry and limit equilibrium method,a three-dimensional stability calculation method of an unstable rock mass with a decided sliding plane considering clamping effect is proposed.Firstly,the local coordinate systems are established according to the spatial geometric distribution of structural planes,and the spatial forces on the separated and locked regions of the structural planes are calculated respectively.Then,the spatial forces in the local coordinate systems are transformed to the main coordinate system of the sliding plane.After calculating the shear and resistance forces,the stability coefficient of the unstable rock mass is obtained.
作者
邹鹏
王思奇
罗刚
赵永杰
李荣发
ZOU Peng;WANG Siqi;LUO Gang;ZHAO Yongjie;LI Rongfa(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 614202,China;Institute of Land and Resources Space Ecological Restoration and Geological Disaster Prevention,Chengdu 610084,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第5期235-243,共9页
Journal of Natural Disasters
基金
国家重点研发计划(2018YFC1505404-2)
四川省科技厅科技计划项目(2021YJ0033)
国家自然科学基金面上项目(41672283)
国家自然科学基金项目(42277143)。
关键词
滑移式危岩体
三维极限平衡
稳定性系数
unstable rock mass with a sliding plane
three-dimensional limit equilibrium
coefficient of stability
