黄土高边坡稳定性评价及施工全过程数值模拟研究

发布时间：2019-05-10 10:05

【摘要】：随着我国经济的高速发展,兴建了大量的基础设施工程。因此,越来越多的岩土体进行了人工开挖,形成了大量的人工边坡。边坡工程在工程项目建设中扮演着重要的角色,其稳定性决定着基础设施是否能够正常运营,并且为了保护自然环境以及减少地质灾害的发生,对边坡工程的稳定性和开挖过程的研究是极其必要的,在各位研究者不断地探索过程中对于边坡问题有了一定的研究基础和成果。本文主要利用ANSYS有限元软件对边坡的稳定性和开挖过程进行模拟和分析。首先是学习和研究了大量的国内外文献,了解了现阶段边坡的稳定性分析方法的研究现状、边坡工程的研究历程和边坡数值模拟方法的研究现状;并介绍了各类边坡可能发生的失稳形式的研究现状、稳定性影响因素以及边坡的支护形式和适用范围。第三章首先对边坡稳定性ANSYS模拟时采用的强度折减法的理论进行了分析以及采用该方法进行稳定性评价的判断依据与极限平衡法的异同点进行了比较。然后根据某边坡工程实例对其稳定性进行了模拟分析,在模拟时采用弹塑性有限元模型和强度折减法,通过边坡塑性区的位置以及计算过程的收敛性确定了该边坡的稳定性安全系数。第四章首先对边坡开挖卸荷后引起的非线性力学问题进行了研究,并对在ANSYS中分析边坡开挖时的具体应用进行了介绍。然后在有限元中对边坡开挖的稳定性进行了分析,同样也是根据工程实例进行了三个工况的分析,即边坡未开挖时的稳定性、上台阶开挖后边坡的稳定性以及下台阶开挖的稳定性状态,计算结果表明三个工况下边坡都是稳定的,并符合工程实际。第五章主要是采用远程自动监测系统对支护之后的黄土高边坡的稳定性进行监测,通过对各项监测数据的分析可得到支护之后边坡的稳定性状态以及其发生地质灾害的趋势,分析结果说明支护后的边坡结构是稳定的,支护结构对其有很好的加固作用满足结构的稳定性要求,现场的监测结果以后能够对地质条件相似的边坡起到一定的指导作用。
[Abstract]:With the rapid development of China's economy, a large number of infrastructure projects have been built. As a result, more and more rock and soil have been excavated and a large number of artificial slopes have been formed. Slope engineering plays an important role in the construction of engineering projects. Its stability determines whether the infrastructure can operate normally, and in order to protect the natural environment and reduce the occurrence of geological disasters. It is very necessary to study the stability and excavation process of slope engineering. In the process of continuous exploration, the researchers have a certain research basis and results on the slope problem. In this paper, ANSYS finite element software is used to simulate and analyze the slope stability and excavation process. First of all, a large number of domestic and foreign literature has been studied and studied, and the research status of slope stability analysis methods, the research course of slope engineering and the research status of slope numerical simulation methods have been understood. The research status of possible instability forms of various slopes, the influencing factors of stability, the supporting forms and applicable scope of slope are also introduced. In the third chapter, the theory of strength reduction method used in ANSYS simulation of slope stability is analyzed, and the judgment basis of stability evaluation by this method is compared with the similarities and differences of limit equilibrium method. Then, according to an example of slope engineering, the stability of slope is simulated and analyzed, and the elastic-plastic finite element model and strength reduction method are used in the simulation. The stability safety factor of the slope is determined by the position of the plastic zone of the slope and the convergence of the calculation process. In chapter 4, the nonlinear mechanical problems caused by the unloading of slope excavation are studied, and the application of ANSYS in analyzing slope excavation is introduced. Then the stability of the slope excavation is analyzed in the finite element method, and the stability of the slope is analyzed under three working conditions according to the engineering example, that is, the stability of the slope when the slope is not excavated. The stability of the slope after the excavation of the upper step and the stability state of the excavation of the lower step. The calculated results show that the slope is stable under the three working conditions and accords with the engineering practice. In the fifth chapter, the stability of loess high slope after support is monitored by remote automatic monitoring system. Through the analysis of each monitoring data, the stability state of slope after support and the trend of geological disaster can be obtained. The analysis results show that the slope structure after support is stable, and the supporting structure has a good reinforcement effect to meet the stability requirements of the structure. The field monitoring results can play a certain guiding role in the slope with similar geological conditions.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU43

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