【作者】 张涛；

【导师】 刘昌清；

【作者基本信息】 西南交通大学 ， 建筑与土木工程（专业学位）， 2018， 硕士

【摘要】 目前我国铁路路基支挡结构设计正在从总安全系数法向基于概率论的极限状态设计方法转轨过程中,需要系统的建立各种支挡结构的极限状态设计表达式。重力式(衡重式)挡土墙、锚杆挡土墙、桩板墙等类型支挡结构已经开展相应极限状态设计方法的研究,但目前对于加筋土挡土墙极限状态设计方法系统的研究相对较少。因此本论文针对加筋土挡土墙极限状态设计方法进行系统的研究,对于完善我国铁路路基支挡结构设计方法的转轨具有重要意义。本论文借鉴了其他类型支挡结构极限状态设计研究的思路,对加筋土挡土墙极限状态设计方法进行研究,论文的主要工作及成果有:(1)对加筋土挡土墙进行受力分析及设计,确定了加筋土挡土墙极限状态方程及功能函数。对加筋土挡土墙基本随机变量进行单因素敏感分析,确定关键随机变量,如综合内摩擦角、填料重度、填料与拉筋摩擦系数及拉筋极限抗拉强度等。(2)采用蒙特卡罗法计算可靠指标,运用Fortran语言编写蒙特卡罗法计算可靠指标的程序,对计算的可靠指标进行统计分析,提出了目标可靠指标建议值。(3)根据目标可靠指标建议值,采用一般分离法计算出加筋土挡土墙荷载和抗力的分项系数,并对分项系数进行检算,建立了加筋土挡土墙极限状态设计表达式。更多还原

【Abstract】 At present,design method on retaining structure of railway subgrade is in the process of the traditional general safety factor method to limit state design method based on the probability theory in China,and systematic limit state design expression of retaining structure needs to build.Retaining structure of pile plate retaining wall,anchored retaining wall,gravity retaining wall and so on,have been carrying out some research about the limit state design method.But so far,the research of reinforced earth retaining wall is relatively less,and the conclusion is lacking.Therefore,this paper is systematic research the limit state design method of reinforced earth retaining wall,It is great significance to improve transform of the design method on retaining structure of railway subgrade.In this paper,the research of the limit state design method about reinforced earth retaining wall reference to the research method of the other retaining structure’s limit state design method,The main works and conclusions of this paper are as follows:(1)The paper determines the limit state equations and functions of reinforced earth retaining wall with the analysis and calculate.The main random variables of the reinforced earth retaining wall are determined by the single factor sensitivity analysis,including the internal friction angle of soil,unit weight of soil,friction coefficient of soil and tension,the limit strength of tension and so on.(2)the reliability index are calculated by the Monte Carlo method procedure with Fortran language.Then statistical analysis the calculation results of reliability index,and put forward the target reliability index.(3)on the basis of the target reliability index,the resistance and load partial coefficient of reinforced earth retaining wall are calculated by the general separation method.and the partial coefficients are checked.and established the limit state design expression.更多还原