支挡结构安全风险识别与设计参数自洽-《高速铁路技术》

文章信息/Info

Title:: Study on Identification of Safety Risks of Retaining Structures and Self-consistency of Design Parameters

Author(s):: WEI Yongxing; WANG Zhansheng; LUO Yinong; LIU Huijuan; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: retaining structure|risk identification|safety factor|partial factor|self-consistency

摘要:: 支挡结构在铁路路基工程中极为常用,对于铁路工程的整体安全至关重要。本文先以桩板墙为例分析了支挡结构面临的主要风险及因素,并从极限状态设计的角度分析了这些因素的类型以及可在设计中予以风险规避的措施。再从可靠性设计的基本原理出发,提出了支挡结构设计中设计变量之间的相关性广泛存在,且是导致自洽规律不满足的主要原因,并给出了保证设计参数自洽的计算方法和流程。最后,从提升极限状态设计适用性、完善极限状态设计功能项、基于极限状态梳理材料参数取值、给出满足自洽规律的设计参数4个方面提出了支挡结构极限状态设计建议。

Abstract:: The retaining structure is commonly used for railway subgrade, and is of great importance to the overall safety of railway. Taking the sheet-pile wall as an example, this paper analyzed the main risks and factors for the retaining structure, classified these factors from the perspective of limit state design, and proposed the risk avoidance measures that can be taken in the design. Based on the basic principle of reliability design, this paper put forward the general existence of correlation among the design variables in the design of retaining structure, which is the main cause of the non-satisfaction of self-consistency law, and proposed the calculation method and procedure to ensure the self-consistency of the design parameters. Finally, some suggestions on limit state design of retaining structure were put forward from four aspects: improving the applicability of limit state design, perfecting the function terms of limit state design, sorting out the values of material parameters based on limit state, and giving the design parameters that meet the self-consistent law.