铁路路基本体结构极限状态设计方法研究

Study on Method in Railway Embankment Limit State Design

极限状态设计方法是工程结构设计方法发展的必然趋势,它基于概率统计论以可靠指标β和失效概率Ff,考虑计算参数的均值同时也考虑了各参数的概率分布特征,不同于以往以容许应力为基础的安全系数设计方法。针对铁路路基本体的结构特点,从概率统计的原理出发,对铁路路基极限状态设计方法进行综合性分析研究,提出以基床表层变形控制的铁路路基基床极限状态设计方法和以瑞典条分法为功能函数铁路路基边坡极限状态设计方法,并利用分离函数建立铁路路基边坡实用设计表达式。

Limit state design is an inevitable trend in the development of engineering structures design. Itdiffers form previous safety factor design in that it considers the mean calculation parameter and also theprobability distribution characteristics of each parameter based on reliability index 茁and failureprobability Ff. According to the structural features of railway subgrade body, the method for design oflimit state railway subgrade is analyzed with reference to the principle of probability and statistics andcomprehensive research is conducted. This paper proposes the design method for the control of surfacedeformation of railway subgrade bed limit state and Sweden method of slices as a function for the design ofrailway subgrade slope limit state, and uses the separation function to establish the expression for thedesign of railway subgrade slope.