考虑土拱效应的多层土体墙后主动土压力模式研究  

Study on active earth pressure mode behind multi-layer soil considering soil arching effect

作　　者：李文彪[1] 吕延豪[1] 游龙飞[1] LI Wenbiao;LYU Yanhao;YOU Longfei(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《人民长江》2024年第6期204-210,共7页Yangtze River

基　　金：中铁第四勘察设计院集团有限公司科技研究开发计划项目(2021K027)。

摘　　要：土拱效应已经被广泛证明存在于岩土工程中,然而关于土拱效应的土压力研究目前常局限于单层土体,对于多层土体墙后主动土压力的分布规律尚不清楚。基于土拱效应理论,提出了多层土体挡土墙后非线性主动土压力求解公式,并通过两种典型地层研究了土体内摩擦角和墙土摩擦角对主动土压力分布规律的影响。结果表明:所提出的计算公式能够很好地描述多层土体墙后主动土压力分布规律,计算结果与数值模拟结果基本一致;当上、下土层参数一致时,该公式可以退化成单一土层土压力计算模型;当墙土摩擦角充分发挥时,上层土体墙后土压力受土体内摩擦角影响明显,而当墙土摩擦角部分发挥时,下层土体墙后土压力受墙土摩擦角影响更大。The soil arching effect is widely proven to be in geotechnical engineering.However,research on the soil pressure caused by the soil arching effect is currently limited to single-layer soil,and the distribution of active soil pressure behind multi-layer soil is still unclear.Therefore,based on the soil arching effect theory,this article proposed a solution for nonlinear active earth pressure behind retaining walls of multi-layer soil,and studied the influence of internal friction angle and friction angle between wall and soil on the distribution pattern of active earth pressure based on two typical strata.The results show that the proposed solution can effectively describe the distribution of active earth pressure behind multi-layer soil.The calculation results are basically consistent with the numerical simulation results.When the parameters of the upper and lower soil layers are consistent,the proposed solution can degenerate into a soil pressure calculation model of single soil layer.When the friction angle between wall and soil is fully utilized,the soil pressure behind the upper soil wall is significantly affected by the internal friction angle of the soil,while the friction angle between wall and soil is partially utilized,the soil pressure behind the lower soil wall is more affected by the wall soil friction angle.

关 键 词：土拱效应 挡土墙 多层土体 主动土压力 

分 类 号：TU432[建筑科学—岩土工程]