期刊文献+

Coulomb模型下考虑墙体侧向位移的土压力计算

Relationship between earth pressure and wall displacement based on Coulomb earth pressure model
收藏 分享 导出
摘要 墙体侧向位移对土压力有显著影响。基于墙体位移–土压力关系是墙后土体应力应变特征的宏观体现这一基本认识,通过构建Coulomb土压力模型下的几何与平衡方程,将直剪试验中微观的土体单位长度剪切位移ε同剪应力τ关系转化成宏观上的墙体位移与土压力曲线,推导了极限位移可求、涵盖主动至被动状态全过程的墙体位移–土压力计算模型。分析表明:滑移区范围、初始应力状态及土体的ε–τ关系是影响墙体位移–土压力曲线的核心要素;相对于主动区,被动区范围对墙土摩擦作用更加敏感,导致静止与被动状态之间的位移–土压力关系受墙土摩擦影响更加显著;墙后土体初始应力状态对墙体位移的影响主要体现为静止土压力系数K_0,随着K_0的增大主动与被动状态下的墙体位移相应增加和减小;极限状态下墙体位移与工程经验吻合,理论模型能基本反映土压力随位移的变化规律。 The magnitude of earth pressure is greatly influenced by wall displacement. Based on the viewpoint that the relationship between wall displacement and lateral earth pressure is the macroscopic embodiment of soil stress-strain behavior, the relationship between soil shear displacement and shear stress is transformed into the wall displacement-earth pressure curve by using the geometric and equilibrium equation. The analysis indicates that the wall displacement-lateral earth pressure curve is primarily governed by the active or passive zones, initial stress state of retaining soil mass and soil stress-strain behavior. The passive zone is more easily changed with the interface friction angle compared with the active one, making that the wall displacement-lateral curve from the initial state to the passive state is affected by the interface friction angle more significantly. The influence of initial earth pressure state lies in the lateral pressure coefficient K0 at rest, and the required wall displacement reaching the active state tends to grow with the increase of K0, while the required displacement reaching the passive state tends to decline. Reasonable agreement between the results of model tests and the predicted values using the proposed method shows that the solution can provide accurate relationship between lateral earth pressures and wall displacement.
作者 谢涛 罗强 张良 蒋良潍 连继峰 XIE Tao1, 2, LUO Qiang1, 2, ZHANG Liang1, 2, JIANG Liang-wei1, 2, LIAN Ji-feng1, 2 (1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 6 10031 ; 2. MOE Key Laboratory of High-Speed Railway Engineering, Chengdu 610031, China)
出处 《岩土工程学报》 CSCD 北大核心 2018年第1期194-200,共7页 Chinese Journal of Geotechnical Engineering
基金 国家重点基础研究发展计划(“973”计划)项目
关键词 墙体位移–土压力曲线 Coulomb土压力模型 剪切位移–剪应力 滑移区范围 初始应力状态 wall displacement-earth pressure curve Coulomb earth pressure model shear displacement-shear stress active or passive zone initial stress state
作者简介 谢涛(1991-),男,博士研究生,主要从事土力学及路基工程方面的研究。E-mail:1535009557@qq.com。
  • 相关文献

参考文献5

二级参考文献49

共引文献109

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈