摘要
山岭深埋隧洞具有丰富的地下水,有压隧洞在施工和运营的不同工况条件下,隧洞围岩第一主应力会发生变化。为了研究有压隧洞施工和运营阶段的地下水的渗流影响,文章基于D-P屈服准则,在平面应变条件下推导了深埋有压圆形隧洞第一主应力分别为径向应力和切向应力时考虑渗流影响的弹塑性解。结果表明:D-P准则模型计算结果与M-C准则计算结果基本吻合,且计算结果较M-C准则偏于安全,验证了该模型的正确性;考虑渗流作用时弹性区径向应力和切向应力随着径向距离的增加不再关于地应力对称,且随着渗透压力的增大,其偏离地应力程度越大;同种条件下,低内水压阶段随着渗透压力的增大塑性区半径增大,高内水压阶段随着渗透压力的增大塑性区半径减小。
Groundwater is normally rich in the deep-buried mountain tunnels,and the major principal stress of surrounding rocks will change under the different conditions of construction and operation stages of the tunnels.In order to study the effect of groundwater seepage,based on D-P yield criterion and considering seepage effect,the elastoplastic solution for the deep-buried and pressured circular tunnel was derived under the condition of plane strain for cases of the major principal stress to be the radial stress and tangential stress.The study shows that the results of D-P criterion model are mainly consistent with those of M-C criterion and more conservative;the radial stress and tangential stress are no longer symmetrical with ground stress with an increase of radial distance in the elastic zone considering the effect of seepage,moreover the larger of the seepage pressure the greater of the deviations;under the same condition,the radius of plastic zone increases with an increase of seepage pressure in the stage of low internal water pressure while the radius of plastic zone decreases with an increase of seepage pressure in the stage of high internal water pressure.
作者
王睢
钟祖良
刘新荣
WANG Sui;ZHONG Zuliang;LIU Xinrong(School of Civil Engineering,Chongqing University,Chongqing 400045;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045)
出处
《现代隧道技术》
EI
CSCD
北大核心
2019年第1期39-46,共8页
Modern Tunnelling Technology
基金
国家自然科学基金项目(51108485)
重庆市自然科学基金计划资助项目(cstc2013jcyjA30005)
关键词
深埋圆形隧洞
渗流
D-P准则
弹塑性解
Deep-buried circular tunnel
Seepage
D-P criterion
Elastoplastic solution
