摘要
地裂缝为西安特有的地质灾害,地裂缝的变形对地铁的施工与运营均有不同程度的影响。首先通过1∶5的大型模型试验,对平行于地裂缝的地铁隧道的致灾模式进行研究,得出结果:地铁隧道随着地裂缝上盘沉降量的增大,结构没有出现扭剪变形,且随着平行距离的增加,地裂缝处滑动土楔对隧道的侧向挤压作用也逐渐减弱。通过数值模拟计算,对以上模型试验分析的结果进行更深入的验证,最后得出结论:地铁隧道与地裂缝上盘间30 m为地铁隧道的安全避让距离。该结论对今后西安地铁建设的选线具有重要的参考价值。
Ground fissure is a unique type of geological disasters in Xi＇an. The deformation of ground fissures has different influences on metro construction and its operation. Firstly, through the 1 ： 5 large scale model tests, I have researched the disaster mode of metro tunnel which is parallel to ground fissures to get the following results： shearing torsion deformation in the structure of metro tunnel will not apper along with the increasing of the hanging side settlement of ground fissures, and along with the increasing of the parallel distance, the tunnel lateral extrusion, which comes from the sliding soil wedge at the point of ground fissures, gradually becomes weaker. Secondly, through numerical simulation, I have conducted deeper research on the result of the above - mentioned model analysis. Finally, I have drawn a conclusion that the safety distance between metro tunnel and the hanging side of ground fissures is 30m, which provides significant reference to the future metro construction in Xi＇an.
出处
《都市快轨交通》
北大核心
2015年第4期89-93,99,共6页
Urban Rapid Rail Transit
基金
中铁第一勘察设计院集团有限公司科研(2010 38)
关键词
西安地铁
地裂缝
平行
模型试验
数值分析
Xi＇an metro
ground fissure
parallel
model test
numerical analysis
