摘要
研究目的:在山区既有铁路沿线进行工程项目建设时,常常会影响原有边坡的稳定性,甚至形成工程滑坡,因此合理评价边坡稳定性是保证既有铁路安全运营的重要前提。本文建立了结合有限元强度折减法和点估计法的边坡可靠度分析方法,并以修建厂房开挖坡脚引起的既有线隧道口边坡失稳为例进行系统分析。研究结论:(1)基于可靠度理论的边坡稳定性评价方法,能较全面地反映岩土参数的空间离散性、时间变异性等不确定性因素的影响,分析结果更为符合工程实际;(2)将有限元强度折减法与点估计法相结合,用于既有铁路边坡稳定性的可靠度分析,克服了传统的安全系数法的缺点,可较为全面地反映岩土体参数变异性对边坡稳定性的影响;(3)计算结果与Monte-Carlo法计算结果基本一致,但计算过程较为简单,因此工程实用性较好,可为类似工程提供借鉴。
Research purposes： When there was new construction project near the existing railway, the excavation activities often affected the slope stability. Even worse, the landslide would be caused as a result of the construction project and associated accidents occurred frequently. So it is essentially important to evaluate the slope stability properly in order to ensure the safe operation of existing railway. In this paper, a new reliability slope stability method was established based on the finite element strength reduction method and the point estimate method, and it was applied to an actual project. Research conclusions： （ 1 ） Slope stability evaluation method based on reliability theory, can comprehensively reflect the influence of the geotechnical parameters of spatial discreteness and time variability, the analysis result more accord with the engineering practice. （2）The reliability slope stability method established in this paper can overcome the shortcomings of traditional safety factor method and can show a better interpretation for the slope stability analysis with the variation of geotechnique parameter. （3） By using the new reliability slope stability method established in this paper, the analysis process is simple and the calculation results is consistent with the Monte - Carlo method, so it is reliable method and has a good promotional value. It can provide a good reference for the similar engineering.
出处
《铁道工程学报》
EI
北大核心
2014年第2期33-37,共5页
Journal of Railway Engineering Society
关键词
既有铁路边坡
边坡稳定性
强度折减法
点估计法
可靠度
existing railway slope
slope stability
strength reduction method
point estimate method
reliability
