黑色岩层边坡演化过程及其稳定性分析

发布时间：2018-06-08 01:16

本文选题：黑色岩层 + 突变理论　；参考：《西南科技大学》2015年硕士论文

【摘要】：由两种基本不同的变化现象,引入了突变理论,梳理了突变理论的发展历程、基本形式及其特征,分析了控制平面内被分叉集所分的不同区域对应的系统的稳定性。根据前人的相关研究成果,总结了基于尖点突变理论解决边坡稳定性等工程问题的一般步骤。本文通过分析黑色岩层XRD实验衍射图谱表明:黑色岩层的主要成分是石英、白云母、伊利石、绿泥石以及少量的黄铁矿等。黄铁矿易被氧化,产生的酸性水会引起矿物成分的化学蚀变,使其产生裂缝,抗剪强度降低。经过长时间的侵蚀,黑色岩层内部产生软弱夹层。本文根据黑色岩层边坡地质情况,建立了岩质边坡力学模型,综合考虑软弱夹层的应变软化、水致弱化以及降雨等因素,建立尖点突变模型。基于突变理论,阐述了稳定性边坡、同步失稳型边坡以及滞后失稳型边坡等三种边坡演化过程,并给出了边坡系统失稳破坏的必要条件。对于边坡的稳定性问题,通过比较分析表明:本文建立的尖点突变模型优于传统的刚度极限平衡法。通过分析实际工程案例表明:基于本文建立的尖点突变模型研究边坡的稳定性等问题是正确性,与实际是相符的。为使计算简单化、快速化,根据本文的研究成果,采用MATLAB语言,编写了用于计算边坡稳定性以及失稳边坡临界失稳系数的程序。
[Abstract]:In this paper, the catastrophe theory is introduced from two basic variation phenomena, the development course, basic form and characteristics of the catastrophe theory are combed out, and the stability of the system corresponding to different regions in the control plane is analyzed. Based on the previous research results, the general steps to solve slope stability problems based on cusp catastrophe theory are summarized. The XRD diffraction patterns of the black strata show that the main components of the black strata are quartz, Muscovite, Illite, chlorite and a small amount of pyrite. Pyrite is easy to be oxidized, resulting in acid water will cause chemical alteration of mineral composition, resulting in cracks and reduced shear strength. After a long period of erosion, weak intercalation is produced inside the black strata. According to the geological conditions of black rock slope, a mechanical model of rock slope is established in this paper. Considering the factors such as strain softening, water induced weakening and rainfall of weak intercalation, a cusp catastrophe model is established. Based on the catastrophe theory, the evolution process of stable slope, synchronous unstable slope and delayed unstable slope are expounded, and the necessary conditions for the failure of slope system are given. For the stability of slope, the comparison and analysis show that the cusp catastrophe model established in this paper is superior to the traditional stiffness limit equilibrium method. Through the analysis of practical engineering cases, it is shown that the research on slope stability based on the cusp catastrophe model established in this paper is correct and consistent with the actual situation. In order to simplify and quicken the calculation, a program for calculating the slope stability and the critical instability coefficient of the unstable slope is compiled by using MATLAB language according to the research results of this paper.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU457

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