【作者】 孙小三；

【导师】 尚岳全；

【作者基本信息】 浙江大学 ， 防灾减灾工程及防护工程， 2005， 硕士

【摘要】 自然灾害对人类的威胁已经引起了全世界的极大关注，滑坡灾害同地震灾害、火山灾害一样已经成为影响人类生存和发展的三大灾害之一。 滑坡问题是个古老的问题，是经典土力学最早试图解决而至今仍未圆满解决的课题；滑坡灾害在我国水利水电、铁道公路、港口房建、矿山工程建设中时常发生，给国民经济建设带来了巨大的损失。因此，如何作好滑坡的防灾减灾工作一直就是边坡工程中首要研究的课题。正确地评价边坡的稳定性是滑坡减灾成功的关键之一，而正确的评价结果依赖于正确的评价方法；因此，边坡稳定性分析方法的研究是边坡问题研究中的一项十分重要的内容。 迄今为止，国内外对土质边坡稳定问题的分析仍然广泛采用极限平衡条分法。它的力学模型简单，已经积累了十分丰富的实际经验。本文以条分法中安全系数的求解为出发点，揭示了条分法中不同计算方法的差异；探讨了条分法中条分数、条间力、滑面法向力对于安全系数的影响规律；揭示了极限平衡条分法的本质以及方法存在的缺陷，在此基础上提出了边坡稳定性的条分法与有限元法耦合分析方法(LE—FEM法)，并建立了方法评价指标的求解体系。LE—FEM法继承了有限元分析的优点，且该法对于边坡稳定性的评价可以和传统的安全系数评价体系接轨，使得计算结果可以直接应用于工程实际。 边坡工程是一个十分复杂的体系。边坡稳定确定性分析方法无法考虑稳定分析中存在的不确定性影响因素的作用，但这种不确定性影响因素又是客观存在的，因此进行边坡稳定可靠性分析是十分必要的。本文基于蒙特卡洛法，在假定容重、强度参数等符合正态分布条件下，揭示了边坡稳定可靠性分析中分析方法、参数的变异性等影响因素对于边坡稳定可靠度的影响规律；从而使得边坡稳定性分析更加合理、更加符合实际情况，更好的为滑坡防灾减灾服务。更多还原

【Abstract】 The threat of natural disaster to mankind has already aroused great concern from whole world, landslide disaster influence human survival hugely and become already one of three major calamities as earthquake disaster, volcano calamity.Landslide question is a pieces of old problem that the classical soil mechanics attempts to solve first, but not solved satisfactorily yet so far. Landslide calamity often takes place in the process of construction of water conservancy and power project, railway highway project, port room build project, mine engineering in our country and brings enormous loss to national economic construction; so how to reduce landslide disaster becomes a primary subject of the research in the slope project. It is the key to reduce natural disasters successfully that appraises the slope stability correctly, and the correct appraisal result depends on the correct appraisal method; so. the research of the slope stability analytical method is a very important content in the slope research.Up until now, the limit equilibrium slice method for slope analysis is used widely in domestic and international yet. Its mechanics model is simple, has already accumulated very abundant practical experience. My paper uses the safety coefficient as the starting point and announces the difference of computing technology; reveals the essence and defect of the limit equilibrium slice methods. On this basis of the limit equilibrium slice methods, this paper proposes LE-FEM method and sets up the appraisement system on the slope stability. LE-FEM method inherits the advantage of finite element method and the appraisement index can conform to the traditional safety coefficient appraisement system, which make the result of calculation be able to apply to reality directly.The slope project is a very complicated system. The analytical method of the determinacy is unable to consider the uncertain influence factor, but the influence factor is objective existence, so the dependability analysis of slope stability is very essential. This paper reveals the influence law of unit weight, intensity parameter that accord with the normal distribution condition basing on the Monte Carlo method which makes slope stability analysis rational, accord with the actual conditions further and serve the prevention and reduction of landslide disaster better.更多还原