基于Ubiquitous-Joint模型的层状岩坡稳定性分析  

Stability Analysis of Stratified Rock Slope Based on Ubiquitous-Joint Model

作　　者：王曰国[1] 王星华[1] 林杭[2] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《灾害学》2007年第4期46-50,共5页Journal of Catastrophology

基　　金：湖南省建设厅资助项目(200407);湖南省建设厅重点项目(04SK2008)

摘　　要：在应力的作用下,层状岩土体表现出来的力学行为比较复杂,目前广泛使用的各向同性模型不再适用,因此,有必要建立合理描述层状岩质边坡的力学模型。以某公路边坡为工程背景,首先,探讨了层状岩质边坡的失稳机制;然后,利用快速拉格朗日差分法(FLAC3D),建立该边坡的数值分析模型,探讨了强度折减技术在U-biquitous-Joint模型中的实施方法,即对岩体和层理面参数同时进行折减,采用计算不收敛作为边坡临界失稳判据;最后,通过数值计算,分析层状岩质边坡稳定性的影响因素,得到边坡整体安全系数F随节理倾角β先减小后增大,呈现两头高中间低的形态。The mechanical behaviors are complicated in some degrees for stratified rock slope under stress load. The isotropic models, which are widely applied in geotechnical engineering, are not suitable for stratified rock slope, so it is necessary to found a mechanical model for describing the behavior of stratified rock slope. A rock slope along a highway is chosen as the engineering project. Firstly, the stability mechanism of slope is analyzed. Secondly, numerical models for the slope are founded by fast lagrangian analysis of continua three dimensions （FLAC^3D ）. The application method of shear strength reduction technique in Ubiquitous-Joint model is discussed. It shows that the parameters of rock mass and weakness plane are reduced at the same time and the non-convergence in numerical ealculation is chosen as the failure criterion for slope. Finally, according to the numerical calculation results, the influential factors to the stability of stratified rock slope are analyzed. The results show that the total safety factor F of slope first decreases then increases with the increase of joint dip angle β and the outline of curve for the relationship between F and β is like shoulder which is higher on both sides and lower at the middle place.

关 键 词：层状边坡 稳定性 Ubiquitous—Joint模型 强度折减法 失稳判据 影响因素 

分 类 号：TU457[建筑科学—岩土工程] P642.22[建筑科学—土工工程]