基于上限定理的带裂缝边坡稳定性分析  

Analysis on Stability of Slope with Crack Based on Upper Limit Theorem

作　　者：高洪滨 罗家易 陈聪 张安康 胡超[2] 徐鹏 GAO Hongbin;LUO Jiayi;CHEN Cong;ZHANG Ankang;HU Chao;XU Peng(CCCC First Harbor Engineering Bureau City Traffic Engineering Co.,Ltd.,Tianjin 300461,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中交一航局城市交通工程有限公司,天津300461 [2]中铁二院工程集团有限责任公司,成都610031 [3]石家庄铁道大学,石家庄050043 [4]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2024年第4期118-123,共6页Subgrade Engineering

基　　金：中国中铁股份有限公司科技研究开发计划(2022-重大-02);山东省重点研发计划(2020CXGC010310)。

摘　　要：裂缝对边坡的稳定性有重要影响,然而目前边坡稳定性规范设计中通常忽视裂缝。基于极限分析中的上限定理,采用有限元极限分析法对不同裂缝长度、倾角、强度(内摩擦角)及筋材长度对边坡稳定性与破裂面形状的影响进行研究。结果表明:随着裂缝长度增大,边坡稳定性逐渐降低,尤其是当边坡坡率较小时;边坡安全系数随着裂缝倾角增大,呈先增大后减小的趋势,垂直裂缝时的安全系数最大;边坡安全系数随着裂缝强度的增大而增大,尤其是边坡内存在长裂缝时;筋材可使破裂面远离坡面并增强边坡的整体性,进而提高边坡稳定性。工程设计中应加强防排水设计,减小雨水诱发裂缝的风险;为避免裂缝发育导致边坡失稳,建议铺设筋材。Cracks have an important effect on the stability of slope,but they are usually neglected in the design of slope stability codes.Based on the upper limit theorem of limit analysis,the stability and fracture surface shape of slope with different crack length,dip angle,strength(internal friction angle)and reinforcement are studied by finite element limit analysis.The results show that the slope stability decreases with the increase of crack length,especially when the slope ratio is small.The safety factor of slope increases first and then decreases with the increase of crack inclination,and the safety factor of vertical crack is the largest.The safety factor of slope increases with the increase of crack strength,especially when there are long cracks in the slope.Reinforcement can keep the fracture surface away from the slope surface and enhance the integrity of the slope,thus improving the stability of the slope.In engineering design,the design of prevention and drainage should be strengthened to reduce the risk of rain-induced cracks.In order to avoid slope instability caused by crack development,it is recommended to lay reinforcement.

关 键 词：边坡 裂缝 极限分析 稳定性 上限定理 

分 类 号：TU473.2[建筑科学—结构工程]