摘要
目前,强度折减法基本上用于边坡的二维稳定分析。为研究其在岩石边坡三维稳定分析中的适用性,选择平面滑动和楔形体滑动2个经典算例,运用强度折减法求解其安全系数,并与E.Hoek和J.W.Bray给出的解析解进行对比。计算结果表明,数值解与解析解非常接近,模拟的滑动方向与理论假定也基本一致。算例中,结构面使用实体单元模拟,为此进一步探讨结构面单元厚度和网格密度对计算精度的影响;结构面均为平面,其厚度为块体高度的1/10～/200,厚度与单元数对安全系数的计算结果影响不大。对特征点位移准则和塑性区贯通准则进行比较分析,认为结构面塑性区贯通收敛准则在理论上与极限平衡理论较为吻合,实际应用上也易于操作,作为收敛准则较为合理。三滑面五面体滑动算例进一步验证该方法的适用性。
The strength reduction method（SRM） is mainly used for two-dimensional slope stability analysis. In order to verify its feasibility for the stability analysis of three-dimensional issues, two benchmark problems, i.e. planar slide and wedge slide, are selected; and the safety factors are calculated by SRM. The obtained safety factors agree well to the analytical solutions by E. Hoek and J. W. Brown; and the modeled sliding direction is also almost the same as the hypothetical one. In the analysis, solid elements are used to model the behavior of structural planes, so the influences of their thickness and element intensity on modeling precision are further investigated. For blocks cut by planar structural planes, the influence is limited when the thickness is 1/10 - 1/200 of the block height. Compared with the displacement criterion of characteristic points, the entirely run-through criterion of plastic zone is more rational for its theoretical coherence to the theory of limit equilibrium and its easy use in application. The stability of a pentahedron block is further analyzed to verify the applicability of the method.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第12期2546-2551,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412702)
国家自然科学基金资助项目(50279051)
关键词
边坡工程
岩坡
三维稳定性分析
强度折减法
slope engineering
rock slope
three-dimensional stability analysis
strength reduction method
