采用极限状态法和容许应力法进行铁路路堤边坡稳定性分析的对比

针对铁路路基设计理论从容许应力法向极限状态法转轨的需求,依托银西(银川-西安)高速铁路,分别采用容许应力法和极限状态法,以Q/CR 9127-2015《铁路路基极限状态法设计暂行规范》中给定的计算表达式和分项系数为基础,对持久状况下多种路堤边坡高度和坡率进行路堤边坡稳定性计算,通过对比分析容许应力法和极限状态法的计算结果,验证出边坡稳定性极限状态法计算结果是可靠的。同时对极限状态法的分项系数进行研究和优化,提出了在满足安全要求的前提下,为使结构设计更加经济,Q/CR 9127-2015中边坡稳定性计算表达式中的分顶系数可提高0.348%。

Comparative Analysis Between Limit State Design and Allowable Stress Design on Railway Subgrade Slope Stability

To meet the demand of railway subgrade design theory transforming from allowable stress design to limit state design,taking Yinchuan-Xi′an high speed railway as an example,this paper used allowable stress design and limit state design respectively to calculate railway subgrade slope stability under persistent conditions with various slope heights and slope rates based on the calculation expressions and partial coeff icients from Q /CR 9127-2015 Interim Codes for Limit State Design of Railway Earth Structure. By comparing the results of the allowable stress design and the limit state design,it is proved that the limit state design is reliable.Partial coeff icients of the limit state design were studied and optimized,then this paper put forward that,on the premise of meeting the safety requirements,the partial coeff icients of the slope stability calculation expression in Q /CR 9127-2015 can be increased by 0.348 % to make the structural design more economical.