摘要
针对桥墩基坑边坡设计中,经典库仑土压力理论未考虑空间约束与土拱效应,导致计算结果偏于保守的问题,开展考虑土拱效应的土压力计算方法研究。在分析桥墩基坑空间受力特征的基础上,综合借鉴普氏理论、圆心成拱法等思想,建立了考虑水平向土拱效应的桥墩基坑边坡分析模型,推导了相应的土压力计算公式。通过算例分析表明,对于具有形成土拱条件的基坑(如黏性土),采用该方法计算所得主动土压力值较传统库仑理论计算结果减小20%~25%,能更合理地反映其空间受力分布。该方法揭示了桥墩基坑边坡的土拱力学机理,为在类似条件下优化边坡支挡结构设计提供了理论依据。
In the design of bridge pier foundation pit slopes,the classical Coulomb earth pressure theory often yields conservative results as it fails to account for spatial constraints and the soil arching effect.This study focuses on developing a calculation method for earth pressure that incorporates the soil arching effect.Based on an analysis of the spatial stress characteristics of bridge pier foundation pits,an analytical model for the slope is established by synthesizing concepts from Protodyakonov’s theory and the centric arch formation method,which comprehensively considers the horizontal soil arching effect.Corresponding formulas for calculating earth pressure are derived.A case study analysis demonstrates that for foundation pits where soil arching conditions are favorable(e.g.,in cohesive soils),the active earth pressure value computed using this proposed method is approximately 20%to 25%lower than the result obtained from the traditional Coulomb theory.This indicates that the proposed method can more accurately reflect the actual spatial distribution of stresses.The research elucidates the mechanical mechanism of soil arching in bridge pier foundation pit slopes,providing a theoretical basis for optimizing the design of slope retaining structures under similar conditions.
作者
于振涛
李飞
于振江
邓睿
Yu Zhentao;Li Fei;Yu Zhenjiang;Deng Rui(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China;Xu Zhengxuan Expert(Model Worker)Geological Innovation Studio,China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)
出处
《山西建筑》
2026年第8期127-131,共5页
Shanxi Architecture
关键词
桥墩边坡
库仑理论
土压力
土拱效应
pier slope
Coulomb theory
soil pressure
soil arch effect
