2013年4月上 施工技术 第42卷第7期 CONSTRUCTIONTECHNOLOGY 93 DOI:10. 7672/ sgjs2013070093 断层对隧道围岩稳定性影响的有限元分析 李文华"，李昊'，古银城²，张一凡² （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) 【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。
【关键词]隧道工程；断层；围岩；稳定性；有限元分析；位移 [中图分类号】TU74；U459.2 [文献标识码]A[文章编号】1002-8498（2013)07-0093-04 FiniteElementAnalysison theInfluenceofFault tothe StabilityofSurroundingRock Li Wenhua'，Li Hao'，Gu Yincheng²，Zhang Yifan² (1.Jiangxi Highway Investment Group Co.，Ltd.，Nanchang，Jiangxi 330025，China; 2.Department of Geotechnical Engineering，Tongji University,Shanghai 200092, China）、 Abstract;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 bees 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 incli...
