【作者】 罗乐；

【导师】 张建经；

【作者基本信息】 西南交通大学 ， 岩土工程， 2013， 硕士

【摘要】 衡重式挡上墙是我国特有的一种墙体形式,在西部山区公路建设中发挥着重要作用。而西部山区多处于高地震烈度地带,地震多发。地震往往造成挡土墙破坏,进而导致道路受损、桥梁破坏、边坡失稳,严重影响抢险救灾工作的进程。因此,研究衡重式挡土墙的抗震性能及影响因素,揭示墙体地震中的破坏机理和规律,对于指导设计和施工有着重要意义.为此,本文主要完成了以下工作：1、介绍了衡重式挡土墙地震土压力计算方法,包括计算上墙土压力的第二破裂面法,计算下墙土压力的延长墙背法、修正延长墙背法、力多边形法。2、阐述了有限元方法理论基础,对有限元软件plaxis进行了简单介绍。3、本文以汶川地震地区某一段衡重式挡土墙震害调查数据为基础,利用有限元软件plaxis模拟其中两例挡墙在地震时的动力反应。以墙顶震后永久位移作为反演控制参数,用有限元方法反演出墙背地震土压力等结果,从震后位移及破坏形式、地震上压力合力以及稳定系数三个方面研究衡重式挡上墙的抗震性能。并对规范方法和有限元方法的计算结果(有限元方法计算结果采用三种处理方式,记为方法1、方法1、方法3)进行比较,以探究挡墙地震破坏的机理。4、在研究典型工况的基础上,对衡重式挡土墙的动力响应进行一般性分析。研究挡墙在不同地震峰值加速度、不同衡重台宽度、墙前不同填上厚度以及不同地基上质条件下抗震性能的差异,并且从墙顶位移及破坏形式、地震土压力合力、稳定系数三个方面初步探究这种差异的机理所在。5、凝练全文主要研究结论,指出了有待进一步研究的问题。更多还原

【Abstract】 Gravity retaining wall with balancing platform is peculiar to our country,and plays an important role in road constructions in western mountains. But western mountains are always in high-seismic intensity and Earthquake-prone areas. Earthquakes tend to cause the damage to the retaining walls, Which in turn led to dmage to road and bridge,and even slope instability,and seriously affect the process of rescue and relief work. Therefore,to study the seismic performance and its influencing factors, and to reveal failure mechanism and laws of the wall in earthquake, is of great significance in guiding the design and construction of gravity retaining wall with balancing platform.Therefore, the mainly works we have done in this paper are as follows:1, Describe the calculation method of seismic soil pressure of gravity retaining wall with balancing platform, including the second failure surface method for calculating upper’ earth pressure, and for calculating bottom’ earth pressure the wall back extending method, the wall back extending amendment method and force polygon method.2, Describe the theoretical basis of the finite element method, and make a brief introduction on Finite element software plaxis.3, Based on damage survey data of some section of gravity retaining wall with balancing platform in Wenchuan earthquake regions, to simulate the dynamic response of the two cases of the retaining wall in the earthquake by use of the finite element software plaxis. Taking the permanent displacement after the earthquake on top of the wall as inversion of control parameters, to inverse the calculation results such as seismic soil pressure by the finite element method. From the three aspects of displacement post-earthquake and failure modes, the total force of seismic soil pressure and stability factor, to analysis the seismic performance of gravity retaining wall with balancing platform. In addition, compare calculation results of specification method and finite element method (there are three approaches to deal with the rasults of the finite element method, denoted as number one,numeber two and number three), to explore the failure mechanism of the retaining wall in earthquake.4, On the basis of the typical operating conditions., made a general analysis of dynamic response for gravity retaining wall with balancing platform. Study the differences of seismic performance for the retaining wall in the aspect of different earthquake peak ground acceleration, different balancing platform width, different filling thickness before wall, and different foundation soil conditions. And from the initial three aspects to explore the mechanism of this difference lies. 5, Condensed the main conclusions, and pointed out the areas for further research.更多还原