层状岩体边坡失稳研究及突变理论的运用

发布时间：2018-06-12 17:00

本文选题：层状岩体 + 失稳机理　；参考：《河北工程大学》2017年硕士论文

【摘要】：目前大多数工程建设都离不开边坡工程,从房建的基坑工程到路桥的填挖方工程。边坡工程直接影响着主体工程建设,边坡失稳破坏不仅会带来人员财产的损失,还会影响工程建设甚至导致停工,因此边坡稳定性评价工作有着重要的意义。为了合理的评价边坡稳定性,本文研究了层状岩体的失稳破坏形式,基于已有的分类综合简化,得到五种破坏形式。通过查阅相关文献,研究了各类层状岩体失稳机理,对顺向坡及反倾坡的失稳机理进行了必要的分类阐述,对斜向坡失稳机理进行了补充研究。在此基础上,本文研究了层状岩体失稳判据,结合文献已有公式进行了补充说明,并对因简化带来的公式缺失进行了合理的公式补充。为了研究实例工程的边坡影响,本文阐述了层状岩体的失稳影响因素,并分为两类进行说明。为了提高强度折减有限元法的计算效率、预测及判断层状岩体边坡的稳定情况,本文引入突变理论。本文对突变理论进行简要介绍并对初等模型势函数进行推导后,最终选取尖点模型作为本文研究层状岩体稳定性评价的理论模型。同时本文基于已有研究进行了势函数的构建并逐步推导得到判别式。为了验证突变理论对强度折减有限元法计算效率的提升及该方法在工程中的效果,本文依托某露天矿边坡工程,分别利用传统的强度折减有限元法及基于突变理论的有限元法对该边坡进行分析,对比说明了后者不仅能够正确的得到研究结果,还可以提高计算效率。同时,本研究还发现并验证了突变理论得到的分析结果受弹性模量参数影响较小。为了探索突变理论对边坡失稳时间的预测,本文最后依托该工程的监测数据,进行了曲线拟合并得到误差可接受的预测时间。
[Abstract]:At present, most projects are inseparable from slope engineering, from the foundation pit of house construction to the filling and excavation of road and bridge. Slope engineering directly affects the construction of the main project. The failure of slope instability will not only lead to the loss of personnel and property, but also will affect the construction of the project and even lead to the suspension of work, so the evaluation of slope stability is of great significance. In order to evaluate the slope stability reasonably, the failure forms of layered rock mass are studied in this paper. Based on the existing classification and comprehensive simplification, five failure forms are obtained. The instability mechanism of various layered rock masses is studied by referring to the relevant documents. The mechanism of instability of the forward slope and the reverse slope is expounded by the necessary classification, and the mechanism of the instability of the inclined slope is studied in addition. On this basis, the instability criterion of layered rock mass is studied in this paper, and the formula deficiency caused by simplification is supplemented with the existing formulas in the literature. In order to study the slope influence of practical engineering, this paper expounds the factors influencing the instability of layered rock mass, and it is divided into two categories to explain. In order to improve the calculation efficiency of strength reduction finite element method and to predict and judge the stability of layered rock slope, the catastrophe theory is introduced in this paper. In this paper, the catastrophe theory is briefly introduced and the potential function of the elementary model is deduced. Finally, the cusp model is selected as the theoretical model to study the stability evaluation of layered rock mass in this paper. At the same time, the potential function is constructed based on the previous research and the discriminant is derived step by step. In order to verify the effect of catastrophe theory on the calculation efficiency of strength reduction finite element method and the effect of this method in engineering, this paper relies on the slope engineering of a certain opencast mine. The traditional strength reduction finite element method and the catastrophe based finite element method are used to analyze the slope. The comparison shows that the latter can not only get the research results correctly, but also improve the calculation efficiency. At the same time, it is found that the analysis results obtained by the catastrophe theory are less affected by the elastic modulus parameters. In order to explore the prediction of slope instability time based on catastrophe theory, based on the monitoring data of the project, the curve fitting and merging are carried out to get the acceptable prediction time of the error.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU457

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