摘要
为给浅埋偏压小净距隧道结构抗震设计提供科学依据,以极限平衡法原理为基础,通过引入水平地震力系数推导出一种能够考虑后行洞施工对先行洞围岩压力影响的浅埋偏压小净距隧道围岩压力计算方法。通过算例分析水平地震作用力对围岩破裂角的影响规律,得出以下结论:先行洞与后行洞深浅埋侧围岩破裂角均随所处围岩级别增大而减小;随着水平地震力系数的增大,先行洞与后行洞浅埋侧破裂角逐渐增大,深埋侧则逐渐减小;水平地震作用力对先行洞深埋侧破裂角的影响大于浅埋侧,且破裂角随围岩级别增大而显著增大;水平地震作用力对后行洞深埋侧破裂角的影响规律与先行洞浅埋侧相似,对于后行洞浅埋侧围岩,水平地震作用力对围岩破裂角的影响程度随围岩级别增大而逐渐减小。
To offer a scientific research basis for the anti-seismic design of shallow tunnels with small spacing under unsymmetrical pressure,a general calculation method,which considers the influence of the construction of the following tunnel under the surrounding rock pressure of the advanced tunnel,is deduced by taking the horizontal seismic force coefficient into consideration based on the limit equilibrium theory.Several calculation examples are computed to study the influence of the horizontal seismic force on the break angle of surrounding rock.The results show that the break angle of the deeper and shallower sides of the advanced and following tunnels decreases with the increase of the surrounding rock grade;with the increase of the horizontal seismic force,the break angle of the shallower side of the advanced and the following tunnels gradually increases,and the break angle of the deeper side gradually decreases;the influence of horizontal seismic force on the break angle of the deeper side of the advanced tunnel is more obvious than that of the shallower side,and the change of the break angle of surrounding rock increases with the increase of the surrounding rock grade;the influence of horizontal seismic force on the break angle of the deeper side of the following tunnel is similar to that of the shallower side of the advanced tunnel;for the surrounding rock of the shallower side of the following tunnel,the influence of the horizontal seismic force on the break angle gradually decreases with the increase of the surrounding rock grade.
作者
王赶
杜建明
房倩
仪珂
WANG Gan;DU Jianming;FANG Qian;YI Ke(Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044.China;School of Civil and Architectural Engineering,Shandong University of Technology,Zibo 255022,China)
出处
《铁道标准设计》
北大核心
2021年第9期133-139,共7页
Railway Standard Design
基金
国家自然科学基金高铁联合基金重点支持项目(U1934210)
北京市自然科学基金资助项目(8202037)。
关键词
小净距隧道
浅埋偏压隧道
水平地震力
围岩压力
破裂角
small spacing tunnel
shallow unsymmetrical pressure tunnel
horizontal seismic force
surrounding rock pressure
beak angle
