断层对隧道围岩稳定性影响的有限元分析  

Finite Element Analysis on the Influence of Fault to the Stability of Surrounding Rock

作　　者：李文华 李昊 古银城[2] 张一凡[2] 

机构地区：[1]江西高速公路投资集团有限责任公司,江西南昌330025 [2]同济大学地下建筑与工程系,上海200092

出　　处：《施工技术》2013年第7期93-96,110,共5页Construction Technology

基　　金：江西省交通厅课题:大型断层破碎带隧道安全施工控制技术研究

摘　　要：为分析断层与隧道相对位置及断层倾角对隧道围岩稳定性的影响,以石吉高速五峰山1号隧道为例,研究了基于断层特征下的围岩稳定性。结果表明,断层距离隧道2倍洞宽以内时,断层对围岩稳定性的影响较大。隧道两侧围岩位移的分布和变化趋势不再对称;隧道穿越断层对围岩稳定性影响最大,在拱肩时次之,在拱脚时较小;随着断层与隧道距离的减小,断层对围岩稳定性的影响增加;随着断层倾角的增加,断层上盘围岩测点竖向位移先减后增,下盘测点竖向位移先增后减。断层倾角为45°左右时,隧道围岩最为稳定。To understand the influence of the relative location of a fault to a tunnel and the inclination angle of the fault on the stability of the surrounding rock, using the Wufengshan Tunnel of Shiji Highway as an example, this paper performed finite element analysis to study stability of surrounding rock based on fault characteristic. The result shows that when the distance between the fault and the tunnel is less than twice of the tunnel diameter, the fault has significant influence to the stability of the surrounding rock. Also, the distribution and variation of deformation along the two sides of the surrounding rock are no longer symmetrical. The fault imposes maximum influence to the tunnel when the tunnel passes the fault. The influence reduces at the spandrel, and becomes relatively small at the skewback. As the distance between the fault and tunnel decreases, the influence of the fault to the stability of surrounding rock increases. With the increase of inclination of the fault, vertical displacement of the surrounding rock at the hanging wall of the fault increases first and followed by decrease, while the vertical displacement at footwall shows opposite tendency. When the inclination angle of the fault is 45, the surrounding rock is the most stability.

关 键 词：隧道工程 断层 围岩 稳定性 有限元分析 位移 

分 类 号：TU74[建筑科学—建筑技术科学] U459.2[建筑科学—桥梁与隧道工程]