基于极限状态设计法的重力式挡墙设计研究

Design Research of Gravity Retaining Wall Based on Limit State Design Method

研究目的:重力式挡土墙极限状态设计的研究,是以墙身自重支撑侧向土压力的明挖基础支挡结构极限状态设计研究的基础。本文通过对重力式挡土墙研究思路的总结和主要计算结果的分析,为悬臂式挡土墙、扶壁式挡土墙、槽型挡土墙等明挖基础支挡结构设计研究提供参考。研究结论:(1)重力式挡土墙极限状态设计研究步骤:建立极限状态方程→计算可靠指标并确定目标可靠指标→计算分项系数及建立设计表达式;(2)影响重力式挡土墙极限状态的最关键因素是综合内摩擦角;(3)现行规范中重力式挡土墙不同的功能检算、不同设计状况,其隐含可靠指标不同,对应的分项系数也应不同;(4)研究结论可直接用于重力式挡土墙的设计,并为其他明挖基础支挡结构设计研究提供参考。

Research purposes： Gravity retaining wall limit state design research is based on the design research of retaining structure limit state of open - cut foundation with the lateral earth pressure supported by wall body weight. This paper sums up the research thought of gravity retaining wall and analyzed their main calculation results, which provides reference for the open - cut foundation retaining structure design research of cantilever retaining wall, counterfort retaining wall, groove type retaining wall and so on. Research conclusions： （ 1 ） The steps for design research of the gravity retaining wall limit state are to establish a limit state equation, to calculate reliability index and determine the target reliability index, calculate partial coefficient and set up the design expression. （2） The most critical factor influencing gravity retaining wall limit state is comprehensive internal friction angle. （3） There are different function calculations and different design conditions for the gravity retaining wall in the current specification, their underlying reliability index is different, the corresponding partial coefficient should also be different. （4） The research conclusion can be used to guide the design of gravity retaining wall, which provides the reference to the design research of other open - cut foundation retaining structure.