挡土墙地震土压力分析新方法研究

发布时间：2018-03-07 10:09

本文选题：地震动土压力　切入点：水平层分析法　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：挡土墙是现实工程中应用最广的特种结构之一,被广泛的用于民用建筑、公路工程、桥梁工程、水利港口工程、铁路工程中。在地震中挡土墙的破坏普遍存在且形式多样,损坏的挡土墙不仅危及人民生命,更严重的会阻塞交通,给震后救援带来难度。挡土墙的抗震设计一直是国内外相关学者研究的课题之一。物部-冈部公式是挡土墙抗震设计中计算动土压力的常用方法,M-O公式的许多假设条件使得它的使用范围有限,且不能得到地震土压力的合力作用位置以及土压力强度分布情况。本文采用旋转挡土墙的计算方法,将地震作用下求解挡土墙主动和被动土压力的问题转换成在静力条件下主、被动土压力的求解问题,采用水平层法分析原理,求得了地震作用下主、被动土压力强度分布、动土压力的合力及墙背作用点高度的解析式,采用图解法原理获得了临界破裂角的解析解。计算模型中考虑了竖向和水平地震加速度、填土与墙背之间存在粘聚力及摩擦角、填土表面存在均布超载、墙背倾角、填土粘聚力等诸多因素的影响,公式适用于常规边界条件和地震作用下粘性土和非粘性土的主、被动土压力求解。案例分析结果表明,在简化条件下本文所得到的公式与M-O公式相同。根据适当假设条件,对采用旋转挡土墙墙法所得到的地震土压力计算式进一步简化,得出了计算地震土压力的简化计算式,汾析结果验证了简化计算式的适用性,旋转挡土墙法简化了主、被动地震土压力计算式的推导过程,统一了挡土墙地震土压力求解。
[Abstract]:Abstract: retaining wall is one of the most widely used special structures in practical engineering. It is widely used in civil construction, highway engineering, bridge engineering, water conservancy and port engineering. In railway engineering, the destruction of retaining walls in earthquakes is widespread and varied in form. The damaged retaining walls not only endanger people's lives, but also block traffic more seriously. Seismic design of retaining wall has always been one of the topics studied by scholars at home and abroad. Object-Okangbu formula is a common method of calculating dynamic earth pressure in seismic design of retaining wall and many false formulas of M-O formula are used in seismic design of retaining wall. Set conditions so that its use is limited, The position of the earth pressure and the distribution of the earth pressure intensity can not be obtained. In this paper, the problem of active and passive earth pressure of retaining wall under seismic action is transformed into the solution of active and passive earth pressure under static condition by using the calculation method of rotating retaining wall, and the principle of horizontal layer analysis is adopted. The analytical expressions of the intensity distribution of active and passive earth pressure, the resultant force of dynamic earth pressure and the height of the action point on the back of the wall under earthquake action are obtained. The analytical solution of critical fracture angle is obtained by using the principle of graphic method. The vertical and horizontal seismic acceleration is considered in the calculation model, the cohesive force and friction angle exist between the fill and the back of the wall, the surface of the fill is overloaded, and the inclination angle of the wall back is considered. The formula can be used to solve the active and passive earth pressure of cohesive soil and non-cohesive soil under conventional boundary conditions and seismic action. Under the simplified condition, the formula obtained in this paper is the same as that of M-O formula. On the basis of proper assumptions, the formula for calculating seismic earth pressure obtained by using the method of rotating retaining wall is further simplified, and the simplified formula for calculating seismic earth pressure is obtained. The result of analysis verifies the applicability of the simplified formula. The method of rotating retaining wall simplifies the calculation process of active and passive seismic earth pressure and unifies the solution of seismic earth pressure of retaining wall.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476.4;TU432

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