基于土拱效应临界深度的新型主动土压力分布模式  

A Novel Active Earth Pressure Distribution Model Based on the Critical Depth of Soil Arching Effect

作　　者：蔡光远 CAI Guangyuan(Xiamen Metro Construction Co.,Ltd.,Xiamen 361004)

机构地区：[1]厦门地铁建设有限公司,厦门361004

出　　处：《现代隧道技术》2024年第6期29-34,共6页Modern Tunnelling Technology

摘　　要：考虑土拱效应的墙后主动土压力求解过程中,土拱并非是在整个区域内发挥作用,而是当达到一定深度时才开始发挥作用。基于此思想,利用考虑土拱效应的土压力理论与经典库仑土压力理论,对土拱发挥作用时的临界深度进行分析,并提出一种基于土拱效应临界深度的新型主动土压力分布模式,通过数值模拟方法对土拱效应临界深度进行验证,并对影响临界深度的参数进行敏感性分析。结果表明:临界深度受土体内摩擦角和墙土摩擦角的影响较大,随着内摩擦角的增加,临界深度会逐渐减小,土拱发挥作用的空间逐渐增大;墙体高度对临界深度的影响较小。In the process of solving active earth pressure behind retaining walls considering the soil arching effect,the soil arching effect does not act across the entire region but only starts to function after reaching a certain depth.Based on this concept,the critical depth at which the soil arching effect occurs is analyzed using the soil pressure theory considering the soil arching effect and the classical Coulomb earth pressure theory,and a novel active earth pressure model based on the critical depth of the soil arching effect is proposed.Numerical simulation methods are employed to validate the critical depth of the soil arching effect,and a sensitivity analysis is conducted on the parame-ters influencing the critical depth.Results indicate that the critical depth is significantly affected by the internal fric-tion angle of the soil and the wall-soil friction angle.As the internal friction angle increases,the critical depth decreases,and the spatial extent of the soil arching effect increases.The height of the retaining wall has a minor influence on the critical depth.

关 键 词：土拱效应 库仑土压力 主动土压力 挡土墙 

分 类 号：U451.1[建筑科学—桥梁与隧道工程]