【作者】 段建；

【导师】 言志信；

【作者基本信息】 中南林学院 ， 森林工程， 2005， 硕士

【摘要】 随着我国国民经济的蓬勃发展,基础设施建设也相应得到了迅猛的发展。独特的地理、地质条件决定了岩质边坡问题在我国非常突出,在工程建设当中经常不可避免地遇到。为了减少和防止各种岩质边坡失稳事故的发生,有必要加强这类边坡稳定性分析方面的研究工作。 通过阅读大量的国内外文献,本文系统总结了岩质边坡稳定性分析研究近几年来所取得的成就,并对岩质边坡稳定性各种分析方法进行了简要评述。在总结前人研究成果的基础上,本文将岩质边坡稳定性的影响因素归纳为地质因素和非地质因素,同时从岩体结构控制论的观点出发,把岩质边坡的工程地质模型总结为:有明显控制性和无明显控制性结构面的岩质边坡工程地质模型,并分析了与之对应的岩质边坡变形破坏类型。基于概率统计理论和蒙特卡洛方法原理,本文还建立了岩体结构面概率模型及其网络模拟分析体系,并使其程序化。针对岩体弹塑性特性,本文基于等效Mohr-Coulomb屈服准则,仅仅通过材料参数的人工换算,实现其在Ansys5.7中的应用,并论证了转化后的材料参数与原参数的大小关系,通过对有明显滑面的岩质边坡算例分析,验证了采用它来代替Mohr-Coulomb屈服准则是可行的,可用来模拟岩体材料,其计算结果偏小、保守,同时也提出了对位移精度要求比较高的有明显滑面岩质边坡工程,宜采用等效Mohr-Coulomb屈服准则来模拟岩体材料;对应力精度要求高的,则适合应用外角点外接圆锥D-P屈服准则的建议。 最后,本文对无明显滑面岩质边坡危险滑移路径的搜索算法进行了改进研究,提出以总抗滑储备密度最小为判据的动态规划方法来确定边坡的危险滑移路径及其安全系数大小的方法,并通过算例得到了验证。更多还原

【Abstract】 With the rapid development of our national economics, the construction of basic facility correspondingly becomes faster. Because of unique engineering geological conditions, there are some outstanding problem of rock slope in China, which we often unavoidably meet during the engineering construction. In order to reduce and prevent from various kinds of the emergence of rock slope accident, it is necessary to strengthen research of rock slope stability analysis.Supported by hundreds of domestic and international bibliographies, this paper systemically details the development process and achievement of the research on stability analysis for rock slope in recent years, and introduces various kinds of analytical methods, then gives brief remarks to each means respectively. On the basis of summarizing forefathers’ research results, this paper summarizes factors influencing rock slope stability into geological and not-geological factor, at the same time, on the ground of rock mass structure controlling theory, the engineering geology model of the rock slope is grouped into two typical classes, one is the model with obvious controlling discontinuities, the other is the model without obvious controlling discontinuities, and this paper correspondingly analyzes their types of destruction. Based on the theory of probable statistics and the principle of Monte Carlo method, this paper sets up statistical model of joint and its network system of simulation, also turns it into procedure. Taking elastic and plastic characteristics of rock into account, in the paper, on the basis of equivalent Mohr-Coulomb criterion, this criterion is successfully applied to FEM program-Ansys5.7 by artificial conversion on rock-soil material parameters only, and this paper proves the size relation between the material transformed parameters and original parameters, it is also shown that this criterion is reasonable through example analyse of the rock slope with obvious controlling discontinuities, and can be adopted to rock material, the result of calculation is little and conservative, the paper puts forward the concept that the rock slope of obvious controlling discontinuities with high expectations for precision of displacement should adopt equivalent Mohr-Coulomb to imitate rock material, the criterion that its rotundatus on the π plane passes through outer anglepoints of Mohr-Coulomb更多还原