铁道标准设计2025，Vol.69Issue(9)：48-58,71,12.DOI:10.13238/j.issn.1004-2954.202401300002
挡墙绕墙底转动模式有限宽度黏土被动土压力研究
Study on Passive Earth Pressure of Finite Width Clay under Rotation around Retaining Wall Base Mode
摘要
Abstract
Retaining structures are inevitably constructed near existing buildings to maintain the stability of limited soil masses.To investigate the passive earth pressure of the limited soil behind the retaining wall,the finite element limit analysis method was employed to explore the failure mode of the wall and provide a theoretical basis for model development.The study focused on finite-width clay,assuming a straight sliding surface through the heel of the wall.Under a rotational displacement mode around the wall base,the soil behind the wall was assumed to form a curved principal stress arch.A layering method along simplified principal stress traces was used to divide the soil behind the retaining wall into several tilted thin-layer units.Considering the wall displacement and the uneven stress distribution at the upper and lower interfaces of each unit,a method for calculating the passive earth pressure of limited soil under the rotation-around-wall-base mode was proposed.Analytical solutions for the resultant force of the passive earth pressure and its point of action were derived,and the reliability of the method was verified.The results showed that the tilted thin-layer unit method effectively captured the stress characteristics of soil elements and more accurately reflected the variation pattern of passive earth pressure in limited soil under rotational conditions.The passive earth pressure of limited soil increased monotonically with depth,with a sharper increase near the wall base.A sensitivity analysis was conducted considering soil cohesion,internal friction angle,wall-soil friction angle,and the aspect ratio B/H.When B/H was less than 1.76,increasing the aspect ratio resulted in a gradual decrease in passive earth pressure and a corresponding rise in the height of the resultant force point.Reducing the internal friction angle φ and soil cohesion c also contributed to reducing the passive earth pressure acting on the retaining wall.When B/H was greater than or equal to 1.76,both the passive earth pressure and the height of its resultant force tended to stabilize.For soils of any aspect ratio,reducing the aspect ratio B/H and soil cohesion c,and increasing the friction angle φ and δ,all help to lower the height of the resultant force point of passive earth pressure.关键词
挡土墙/有限土体/被动土压力/主应力迹线/倾斜薄层单元Key words
retaining wall/limited soil/passive earth pressure/principal stress trace/tilted thin-layer unit分类
交通工程引用本文复制引用
李新军..挡墙绕墙底转动模式有限宽度黏土被动土压力研究[J].铁道标准设计,2025,69(9):48-58,71,12.基金项目
国家重点研发计划项目(2023YFC3009304) （2023YFC3009304）
中铁第四勘察设计院集团有限公司科技研究开发计划课题(KY2023024S) （KY2023024S）
