滑坡防治预应力格构锚固技术物理模型试验研究

发布时间：2018-05-30 11:09

本文选题：滑坡防治 + 预应力格构锚固体系　；参考：《长安大学》2015年硕士论文

【摘要】：预应力格构锚固体系是一种主动抗滑结构,具有表面护坡和深层加固双重兼顾,结构轻便,施工简单,技术风险低等优点。在滑坡防治工程中可以和抗滑桩等技术组合协调使用,与植被护坡技术相配合,既可以达到保证滑坡稳定性的目的,又可以对滑坡进行有效的绿化,是一种高效、经济、环保的滑坡治理加固措施。但由于该技术在工程中应用时间不长,直至目前尚未建立有效、完善的设计理论,对其设计主要还是依据工程实践经验,因此对预应力格构锚固体系设计理论开展研究,具有重要的理论意义和工程应用价值。本文依托中国地质调查局项目“滑坡防治格构锚固技术大型物理模型试验(项目编号:1212011220145)”,重点研究了预应力格构锚固体系的抗滑机理、变形特点和破坏模式,通过研究得出如下主要成果:(1)根据相似理论确定了模型试验相似常数,对预应力格构锚固物理模型试验进行了设计。(2)通过全站仪监测和位移计测试,得到了滑坡体和格构梁位移变形情况;通过埋设在坡脚和坡体的压力盒,对格构锚固体系中滑体内部应力分布规律进行了测试;通过在格构梁底部埋设微型压力盒,测试了格构梁底部地基反力分布规律;通过安装在锚头的锚杆拉力计和在锚杆主筋上粘贴应变片,研究了预应力格构锚固体系中锚杆受力特点、分布规律以及变形情况;通过粘贴在格构梁钢筋上的应变片,测试得到滑坡时格构梁应力变化规律。(3)运用故障类型与影响分析(FMEA)方法对预应力格构锚固体系破坏类型进行了分析,总结了体系主要破坏类型,分析了设计和施工阶段加强要点,对预应力格构锚固体系设计具有一定的参考价值。
[Abstract]:Prestressed latticed Anchorage system is an active anti-slide structure, which has the advantages of both surface slope protection and deep reinforcement, lightweight structure, simple construction, low technical risk and so on. In landslide prevention and control engineering, it can be used in coordination with anti-slide piles and other technologies, and with vegetation slope protection technology. It can not only ensure the stability of landslide, but also make effective greening of landslide. It is an efficient and economical method. Environmental protection measures for landslide treatment and reinforcement. However, since the application of this technology in engineering is not long, until now, the effective and perfect design theory has not been established, and its design is mainly based on engineering experience, so the design theory of prestressed latticed Anchorage system is studied. It has important theoretical significance and engineering application value. Based on the project of China Geological Survey "Large-scale physical Model Test of landslide Prevention and Control Lattice Anchorage Technology (Project No.: 1212011220145)", this paper focuses on the anti-sliding mechanism, deformation characteristics and failure mode of prestressed latticed Anchorage system. According to the similarity theory, the similarity constant of the model test is determined, and the physical model test of prestressed lattice Anchorage is designed. The displacement and deformation of sliding body and lattice beam are obtained, the stress distribution of sliding body in lattice Anchorage system is measured by the pressure box embedded in slope foot and slope body, and the micro pressure box is embedded at the bottom of lattice beam. The distribution law of the reaction force at the bottom of the lattice beam is tested, and the stress characteristics, distribution and deformation of the anchor rod in the prestressed latticed Anchorage system are studied by means of the anchor tension meter installed on the anchor head and the strain gauge affixed to the main reinforcement of the anchor bar. By means of the strain gauge attached to the steel bar of lattice beam, the stress variation law of lattice beam during landslide is obtained. The failure type and influence analysis are used to analyze the failure type of prestressed lattice Anchorage system, and the failure type of prestressed lattice Anchorage system is analyzed by FMEA method. The main failure types of the system are summarized, and the key points of strengthening in design and construction are analyzed, which has certain reference value for the design of prestressed lattice Anchorage system.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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