倾斜基底作用对挡土墙可靠指标的影响-《高速铁路技术》

文章信息/Info

Author(s):: GUO Haiqiang; LUO Yinong; LI Anhong; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: retaining wall|sloped base|limit state design|partial coefficient|reliability index

摘要:: 目前，Q/CR 9127-2015《铁路路基极限状态法设计暂行规范》已经发布，《铁路路基支挡结构极限状态设计规范》正在编制过程中。因此急需对支挡结构分项系数的合理性进行系统验证，以为规范修订编制提供依据。经过验证和研究发现，在斜底的影响下，挡土墙在一般地区与浸水地区（常水位）的抗滑分项系数不能统一。文章针对该问题，采用蒙特卡洛法对有、无斜底的挡土墙抗滑动可靠指标进行对比分析。结果表明：（1）在总安全系数法抗滑稳定性系数Kc控制设计情况下，挡土墙采用有斜底设计较采用无斜底设计的结构抗滑动可靠指标小。（2）建议《铁路路基支挡结构极限状态设计规范》在对分项系数统一时采用无斜底所对应的分项系数。

Abstract:: At present, Q/CR 9127-2015 Tentative Specification for Railway Subgrade Limit State Method Design has been published. The Code for Limit State Design of Retaining Structure of Railway Subgrade is being compiled. The partial coefficient of retaining structures is needed to be systemically validated and provide the bases for revision of the standards mentioned above. In the process of validation research, find that the anti-slide partial coefficients of retaining wall can’t be unified between general district and soaking district (normal water level) because of the influence of sloped base. Aiming at this problem, comparative analysis on the anti-slide reliability indexes of retaining wall with sloped base and without sloped base by using monte-carlo method is done. The research conclusion shows that:(1) In the case of design on retaining wall controlled by anti-slide stability coefficient (K_c), the anti-slide reliability index of retaining wall with sloped base is smaller than that without sloped base. The risk of design on retaining wall with sloped base is larger than that without sloped base. (2) The anti-slide partial coefficient of retaining wall without sloped base should be accepted by Code for Limit State Design of Retaining Structure of Railway Subgrade when unifying the partial coefficients.