锚索预应力失效对边坡稳定性的影响研究

发布时间：2018-01-29 19:59

本文关键词： 锚索预应力失效稳定性分析岩质边坡数值模拟　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的不断发展,各类建设工程诸如高速公路工程、水利水电工程、铁路工程、工民建筑工程等建设中出现的边坡加固支护技术越来越多。预应力锚索就是其中一种广泛应用于边坡工程的加固技术。预应力锚索可以充分发挥岩石的自身承载力,也可以提高岩石的强度和自稳能力,从而减轻支护结构的自重。预应力锚索还具有节省工程成本、保证工程质量、提高施工的安全性的重要作用,具有显著的社会和经济效益。但由于施工过程中难免出现的不确定性,能影响预应力出现损失甚至失效的因素很多,在现实工程中,我们经常可以发现各种边坡失稳造成的事故,给国民经济和人民利益造成了不可挽回的损失。因而,探究预应力锚索在边坡工程中的作用原理和失效模式具有相当普遍的研究价值。在本文中,作者以应用研究为出发点,结合理论分析和数值分析两个方面来针对预应力锚索加固岩质边坡工程研究锚索预应力失效对边坡稳定性的影响,完成的主要工作如下:①根据预应力锚索在岩质边坡工程中的应用类型,作用状况等分析总结出预应力锚索加固边坡的作用原理。②研究了锚索预应力失效破坏的影响因素,同时通过分析一般常用的边坡稳定性分析方法,总结出了这些方法的优缺点和它们的适用范围。详细的介绍了影响边坡失稳的主要因素和破坏形式,并深入研究了单锚、群锚失效对边坡稳定性的影响。③对数值分析理论进行了研究,同时对边坡失稳的屈服准则和本构模型进行了选取。④采用数值分析软件FLAC3D对锚索加固边坡时预应力失效的各种不同情况下,边坡的水平位移、竖直位移、塑性区的发展情况进行了数值模拟。最后,本文通过对锚索预应力失效对边坡稳定性影响的研究,得出了边坡在锚索预应力各种不同失效情况下的变形情况和安全系数的变化规律,提出了一些改善锚索预应力失效的相关措施。
[Abstract]:With the continuous development of our economy, various construction projects such as highway engineering, water conservancy and hydropower projects, railway projects. There are more and more slope reinforcement and support technologies in the construction of engineering, such as workmen and civilian buildings. Prestressed anchor cable is one of the reinforcement techniques widely used in slope engineering. Prestressed anchor cable can give full play to the bearing capacity of rock itself. Force. It can also improve the strength and self-stability of rock, thus reducing the weight of the supporting structure. The prestressed anchor cable can also save the engineering cost, ensure the quality of the project and improve the safety of construction. It has remarkable social and economic benefits. However, due to the uncertainty in the construction process, there are many factors that can affect the loss or even failure of the prestressing force. We can often find all kinds of slope instability caused by accidents, to the national economy and the interests of the people caused irreparable losses. Exploring the action principle and failure mode of prestressed Anchorage cable in slope engineering has very common research value. In this paper, the author takes the application research as the starting point. Combined with theoretical analysis and numerical analysis to study the influence of prestressed cable failure on slope stability in view of pre-stressed anchor cable reinforcement rock slope engineering. The main work accomplished is as follows: 1 according to the application type of prestressed Anchorage cable in rock slope engineering. The action principle of prestressed anchor cable strengthening slope is summarized. 2. The influencing factors of pre-stress failure of anchor cable are studied. At the same time, the commonly used slope stability analysis method is analyzed at the same time. The advantages and disadvantages of these methods and their scope of application are summarized. The main factors and failure forms that affect the slope instability are introduced in detail, and the single anchor is deeply studied. The influence of Group Anchor failure on Slope Stability. 3 the numerical analysis theory is studied. At the same time, the yield criterion and constitutive model of slope instability are selected. 4. The horizontal displacement of slope is analyzed by numerical analysis software FLAC3D. The development of vertical displacement and plastic zone is numerically simulated. Finally, the influence of prestressed cable failure on slope stability is studied in this paper. The deformation and safety coefficient of the slope under various failure conditions of anchor cable prestress are obtained, and some relevant measures to improve the failure of anchor cable prestress are put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45

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