长沙理工大学学报（自然科学版）2025，Vol.22Issue(2)：78-86,9.DOI:10.19951/j.cnki.1672-9331.20241211002
短卸荷平台挡墙土压力解析计算模型
Analytical calculation model for earth pressure on retaining walls for short unloading platforms
摘要
Abstract
[Purposes]Retaining walls for short unloading platforms have been widely used in high fill slopes and have good economic efficiency.However,traditional earth pressure calculation models do not consider the stress reduction effect of vertical additional load transmitting downward according to the diffusion angle,resulting in deviation in calculation results.This paper aims to improve the theory of earth pressure calculation and provide theoretical support for the design of retaining walls for short unloading platforms.[Methods]Theoretical deduction was conducted,and the calculation formula for the resultant force of earth pressure was derived based on Rankine's earth pressure principle,without considering the viscosity of the backfill.The value of the diffusion angle was discussed based on the Flamant formula,and the analytical calculation model for earth pressure was established.The influence of the aspect ratio and step ratio of the short unloading platform on the resultant force of earth pressure was analyzed,and the width and placement of the short unloading platform were optimized.[Findings]When earth pressure is calculated,the diffusion effect needs to be considered.It is reasonable to arrange the additional lateral earth pressure in a rectangular manner,and the recommended diffusion angle is 45°.As the aspect ratio of the short unloading platform λ increases,the active earth pressure gradually decreases,and the optimal aspect ratio is λs=1-ξ.An analytical solution is obtained for the step ratio ξmin corresponding to the minimum earth pressure Ea,min.When λ ranges from 0.20 to 0.25,the corresponding step ratio is 0.62,which is close to the golden ratio.The earth pressure decreases to 56%-60%of that without a short unloading platform.[Conclusions]The research results have improved the analytical calculation model for earth pressure on retaining walls for short unloading platforms,optimized the width and placement of short unloading platforms,and provided guidance for the design of retaining walls for short unloading platforms.It also has important reference value for the support of difficult and complex slopes in high fill and deep foundation pits.关键词
解析计算模型/卸荷平台挡墙/附加应力/压力扩散角/分阶比Key words
analytical calculation model/retaining wall for unloading platform/additional stress/pressure diffusion angle/step ratio分类
土木建筑引用本文复制引用
陈柏林,王剑峰,王永甫,何飞,皮海洋,彭海游,叶晓明..短卸荷平台挡墙土压力解析计算模型[J].长沙理工大学学报（自然科学版）,2025,22(2):78-86,9.基金项目
重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX1618、CSTB2022NSCQ-MSX1466) （CSTB2022NSCQ-MSX1618、CSTB2022NSCQ-MSX1466）
中交建筑集团重大科技项目([2023]316-06) （[2023]316-06）
重庆市规划和自然资源局科技项目(DK-2023Z030210C、DK-2023Z030211C) General Program of Natural Science Foundation of Chongqing(CSTB2022NSCQ-MSX1618,CSTB2022NSCQ-MSX1466) （DK-2023Z030210C、DK-2023Z030211C）
Major Scientific and Technological Project of China Communications Construction Group([2023]316-06) （[2023]316-06）
Scientific and Technological Project of Chongqing Municipal Planning and Natural Resources Bureau(DK-2023Z030210C,DK-2023Z030211C) （DK-2023Z030210C,DK-2023Z030211C）
