加筋土挡土墙设计毕业设计.doc

摘要
加筋土挡墙是由拉筋、墙面板和填土构成的一种新型复合支挡结构物。相对于传统的重力式挡土墙,加筋土挡墙为一种柔性结构,具有较好的变形协调性和抗震性能,对地基的承载能力要求也不高,且具有很好的经济性和造型美观性等一些其他结构无法比拟的优越性。因此,被广泛应用与公路、水利、城市建设和铁路等工程中。
加筋挡土墙虽有较好的抗震性能,但并非能够抵抗任何等级的地震作用。对于规范要求的抗震设计加筋土挡墙工程,在设计计算时须考虑地震力对其的影响。根据现行相关规范,地震烈度在6度以上的地区,加筋土挡墙应进行抗震设计。采用拟静力法来考虑地震作用,不计竖向地震力的影响,只需考虑水平地震力作用。
本文对加筋挡土墙的构造、特点及其发展应用状况作了概述。通过加筋挡土墙的构造,分析了加筋挡土墙的加固机理和破坏模式。加筋土本身是一种复合结构,在工作态下,各组成部分之间的相互影响使其具有一定的复杂性。
关键词:加筋土挡墙;地震力;稳定性分析与计算
Abstract
Reinforced earth retaining wall is a posite supporting prised of reinforcement, wall sheathing and filling. Compared with traditional gravity retaining wall, the reinforced earth retaining wall is a flexible structure with better patibility and seismic , the reinforced earth retaining wall requires low foundation bearing capacity and has advantages like economical efficiency as well as better appearance which are parable to other structures. Therefore, it is widely used in the construction of road, water conservancy, city construction and railway.
The reinforced earth retaining wall having good seismic behavior does not mean it can resist the earthquake effect of any grade. To reinforced earth retaining wall with seismic design required in the specification, the effect of seismic force should be taken into account in design calculation. According to the current standard, in the area where seismic intensity is level six or above, the reinforced earth retaining wall should be designed to resist earthquake. If adopting pseudo-static method to calculate seismic effect, the effect of vertical seismic force should be neglected, only calculating the effect of horizontal seismic force.
This thesis gives a brief introduction to the structure, characteristics, development and application of the reinforced earth retaining wall, at the same time, analyzes its reinforcement mechanism and failure modes through the structure of the reinforced earth retaining wall. Reinforced earth is posite structure itself, and interrelationship of ponen