一种广义Morgenstern-Price法及其应用

发布时间：2018-02-01 16:13

本文关键词： 滑坡稳定性新型节理本构模型 GEO-SLOPE　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：现今,在人类对大自然的开发和利用过程中,由于最初的设计和后续的施工不当,形成了大量的人工边坡,这些边坡有部分处于人口密集区,一旦出现滑坡等灾害,极有可能引起重大的财产损耗。同时我国是一个山区较多的国家,占国土面积三分之二以上的都是山地,在部分省份,几乎全省都处于山区,这就形成了各种各样数量众多的自然边坡。无论自然边坡还是人工边坡都可能引起非常严重的后果。因此,加强滑坡灾害的研究,尤其是对滑坡稳定性开展研究,具有重要的现实意义和巨大的社会、经济效益。本文作者读研期间有幸参与了三峡库区地质灾害防治项目和恩施土家族苗族自治州的边坡治理项目,现场接触了众多的滑坡,同时也看到了滑坡带来的危害,这些危害促使作者对滑坡稳定性开展研究。本文对现今滑坡稳定性计算运用最多的极限平衡分析法和有限元法对比研究,分析了这两类方法在使用中存在的优缺点,在此基础上总结出现有滑坡稳定计算方法存在的最主要的几个问题:首先,滑面采用理想弹塑性模型,未考虑滑面真实应力应变;第二,稳定系数定义欠妥;第三,这些方法均采用并不严谨的强度折减法;最后,在传统边坡稳定分析中,多数采用极限平衡条分法,极限平衡条分法均是建立在极限平衡状态(极限平衡状态是指:可能的滑动面均达到临界状态,也即是峰值应力状态)之上,实质假定了整个滑面同时处于临界状态,也即是:边坡在破坏时,滑面是同时或几乎同时发生破坏。为了解决这些问题,获取滑坡更加真实的稳定性,本文作者在对卢应发教授及其团队所提出的新本构模型基础上,结合传统Morgenstern-Price法,提出了一种广义Morgenstern-Price法稳定系数定义法。该方法引入卢应发教授的新型节理本构模型,同时详细介绍了该模型的参数标定方法。本文作者利用传统极限平衡法、新条分法对五里坡滑坡具体实例进行安全系数计算,对比研究各个方法计算结果,探究广义Morgenstern-Price法的合理性和优越性。并采用成熟有限元软件GEO-SLOPE模拟计算五里坡滑坡稳定系数。计算结果表明:广义Morgenstern-Price法理论完善,计算方法快捷方便,计算结果合理,数值模拟效果较好。
[Abstract]:Nowadays, in the process of human exploitation and utilization of nature, due to the initial design and subsequent improper construction, a large number of artificial slopes have been formed, some of which are in densely populated areas. Once landslide and other disasters occur, it is very likely to cause significant property loss. At the same time, China is a mountainous country, accounting for more than 2/3 of the land area is mountainous, in some provinces. Almost all of the province is in the mountainous area, which forms a variety of numerous natural slopes, whether natural slopes or artificial slopes may cause very serious consequences. Therefore, the study of landslide disasters should be strengthened. Especially the study of landslide stability has important practical significance and huge society. The author was fortunate to participate in the three Gorges reservoir area geological disaster prevention and control project and the slope control project of Enshi Tujia and Miao autonomous prefecture during his study. At the same time, we also see the harm brought by landslide, which urges the author to study the landslide stability. In this paper, the limit equilibrium analysis method and finite element method are used to calculate the landslide stability. The advantages and disadvantages of these two methods in use are analyzed. On this basis, the main problems of landslide stability calculation method are summarized: first, the sliding surface adopts an ideal elastic-plastic model. The true stress and strain of sliding surface are not taken into account; Second, the definition of stability coefficient is not well defined; Third, these methods are not rigorous intensity reduction; Finally, in the traditional slope stability analysis, most use the limit equilibrium slice method, the limit equilibrium strip method is based on the limit equilibrium state (the limit equilibrium state means that the possible sliding surface reaches the critical state. Above the peak stress state, the whole sliding surface is assumed to be in critical state at the same time, that is, when the slope is destroyed, the sliding surface is destroyed at the same time or almost at the same time. In order to solve these problems. Based on the new constitutive model proposed by Professor Lu Ying-fa and his team, the author combines the traditional Morgenstern-Price method. A new method of defining the stability coefficient of the generalized Morgenstern-Price method is presented, which is introduced into Professor Lu Ying-fa 's new constitutive model of joints. At the same time, the parameter calibration method of the model is introduced in detail. The authors use the traditional limit equilibrium method and the new strip method to calculate the safety factor of the Wu#china_person0# landslide, and compare the results of each method. The rationality and superiority of the generalized Morgenstern-Price method are explored, and the stability coefficient of the Wu#china_person0# landslide is simulated by the mature finite element software GEO-SLOPE. The calculation results show that the stability coefficient of the Wu#china_person0# landslide is calculated. :. The theory of generalized Morgenstern-Price method is perfect. The calculation method is quick and convenient, the calculation result is reasonable, and the numerical simulation effect is better.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.22

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