新型复合抗滑支挡结构的抗震分析与设计

发布时间：2018-09-05 13:42

【摘要】：我国是一个地震多发国家,曾发生过多次大型地震,直接造成巨大的生命和财产损失。边坡失稳及震后降雨等引发的山体滑坡也导致了不容忽视的次生灾害。地震对交通设施的破坏,阻碍了救援工作的有序进行。现有的支挡结构虽然在一定程度上能够保持边坡和路基的稳定,但是在强震条件下,支挡效果还有进一步提高的必要。本文针对加筋土挡墙不适用于陡峭山坡及高烈度地震区的问题进行了分析和验证,在此基础上选取支挡结构中抗震性能较好的锚定板桩墙与加筋土挡墙复合,组成一种新型复合抗滑支挡结构(以下简称“复合结构”)。二者构成了桩—锚复合、刚—柔复合的整体形式,可充分发挥加筋土挡墙提高路基整体稳定性和锚定板桩墙有效控制边坡滑移的优势。本文利用有限元软件ABAQUS数值模拟了复合结构,分析其抗震性能,就设计参数进行影响性分析,对该结构的抗震设计提出一些思考和建议。本文主要在以下方面开展了分析与研究工作:①通过研读相关资料,归纳总结了国内外在加筋土挡墙、桩板墙以及抗滑支挡结构的抗震等三方面的研究现状。②整理并阐述了加筋土挡墙与锚定板桩墙的工作原理,进而分析得到复合结构的特点及工作原理。③针对规范中规定的加筋土挡墙不适用于陡峭山坡及高烈度地震区的问题,利用大型有限元软件ABAQUS对模型进行了数值分析与验证,在此基础上重点研究了复合结构在地震作用下的力学响应,并与锚定板桩墙做以比较分析,以便了解复合结构在抗震性能方面的表现和优势。④分析复合结构在地震作用下,桩间距、桩截面尺寸、桩锚固深度、加筋材料竖向间距等设计参数对结构抗震性能的影响,并针对复合结构的抗震设计提出建议。通过以上分析及研究工作,本文取得以下主要成果和结论:①提出了复合结构的结构形式,即以挡土板为中介将加筋土挡墙与锚定板桩墙复合成为整体。对复合结构的特点及工作原理进行了阐述。②通过有限元软件的数值分析,验证了加筋土挡墙不适用于陡峭山坡和高烈度地震区的问题。③与锚定板桩墙比较,在地震作用下复合结构的施用可有效降低结构的位移和应力,特别是对水平应力具有明显的降低作用。复合结构的抗震性能较单一支挡结构有明显提升。④设计参数的变化对复合结构抗震性能的影响呈现多样性。其中桩间距的变化对桩与挡土板的水平应力影响显著。桩截面尺寸对挡土板的水平应力影响较明显。锚固深度对结构各部件的影响相对较小。加筋材料竖向间距对桩的水平应力产生较大影响。⑤在复合结构的抗震设计中,应重点关注桩根部、桩与挡土板连接处以及挡土板边角处的受力情况,避免应力集中现象发生。
[Abstract]:China is an earthquake-prone country, which has caused great loss of life and property. Landslide caused by slope instability and rainfall after earthquake also leads to secondary disasters that can not be ignored. The destruction of transportation facilities by the earthquake hindered the orderly conduct of rescue work. Although the existing retaining structure can maintain the stability of slope and roadbed to a certain extent, it is necessary to further improve the retaining effect under strong earthquake conditions. In this paper, the problem that reinforced earth retaining wall is not suitable for steep slope and high intensity seismic area is analyzed and verified. On this basis, the composite of anchoring plate pile wall with reinforced earth retaining wall with good seismic performance in retaining structure is selected. A new type of compound anti-slide retaining structure (hereinafter referred to as "composite structure") is formed. Both of them constitute the integral form of pile-anchor composite, rigid-flexible composite, which can give full play to the advantages of reinforced earth retaining wall to improve the overall stability of roadbed and anchor sheet pile wall to effectively control slope slip. In this paper, the finite element software ABAQUS is used to simulate the composite structure, the seismic performance of the composite structure is analyzed, the influence of the design parameters is analyzed, and some thoughts and suggestions on the seismic design of the structure are put forward. This paper mainly carried out the analysis and research work in the following aspects: 1. Through reading the relevant materials, summarized the reinforced earth retaining wall at home and abroad. The research status of pile-slab wall and anti-slide retaining structure is summarized and the working principle of reinforced earth retaining wall and anchored plate pile wall is expounded. The characteristics and working principle of the composite structure are analyzed. 3. Aiming at the problem that the reinforced earth retaining wall specified in the code is not suitable for steep slopes and seismic areas with high intensity, the model is numerically analyzed and verified by using the large-scale finite element software ABAQUS. On the basis of this, the mechanical response of composite structure under earthquake action is studied emphatically, and compared with the anchoring plate pile wall, in order to understand the performance of composite structure in seismic performance and the superiority of 4. 4 to analyze the composite structure under earthquake action. The effects of design parameters such as pile spacing, pile cross-section size, pile anchoring depth and vertical spacing of reinforced materials on seismic performance of structures are discussed. Suggestions for seismic design of composite structures are put forward. Through the above analysis and research work, this paper obtains the following main achievements and conclusions: 1 puts forward the structure form of composite structure, that is, the reinforced earth retaining wall and anchored sheet pile wall are combined as a whole with retaining plate as intermediary. In this paper, the characteristics and working principle of composite structure are expounded. 2. Through numerical analysis of finite element software, it is proved that reinforced earth retaining wall is not suitable for steep hillside and high intensity seismic area. 3 is compared with anchoring plate pile wall. The application of composite structure under earthquake can effectively reduce the displacement and stress of the structure, especially the horizontal stress. The seismic performance of composite structure is much higher than that of single retaining structure. 4. The influence of the variation of design parameters on the seismic performance of composite structure is diverse. Among them, the change of pile spacing has a significant effect on the horizontal stress of pile and retaining plate. The influence of pile section size on horizontal stress of retaining plate is obvious. The effect of anchoring depth on each component of the structure is relatively small. The vertical spacing of reinforced material has a great influence on the horizontal stress of pile. In the seismic design of composite structure, the stress situation of pile root, the connection between pile and retaining plate and the corner of retaining plate should be paid more attention to, so as to avoid the phenomenon of stress concentration.
【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】：U417.1

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