【作者】 黄强兵； 彭建兵； 王启耀； 高虎艳；

【Author】 HUANG Qiangbing~(1,2),PENG Jianbing~(1,2),WANG Qiyao~3,GAO Huyan~4 (1.Department of Geological Engineering,Chang’an University,Xi’an,Shaanxi 710054,China;2.Key Laboratory of Western China’s Mineral Resources and Geological Engineering,Ministry of Education,Chang’an University,Xi’an,Shaanxi 710054, China;3.School of Civil Engineering,Chang’an University,Xi’an,Shaanxi 710061,China;4.Xi’an Underground Railway Co., Ltd.,Xi’an,Shaanxi 721000,China)

【机构】 长安大学地质工程系； 长安大学西部矿产资源与地质工程教育部重点实验室； 长安大学建筑工程学院； 西安市地下铁道有限公司；

【摘要】 西安地铁穿越多条活动地裂缝带,地裂缝未来活动对地铁隧道结构造成严重威胁。论述西安地裂缝成因、活动方式和剖面特征,对未来地裂缝活动趋势和地铁设计使用期内地裂缝最大垂直位移量进行分析和预测。通过浅埋暗挖马蹄形地铁隧道穿越地裂缝带的三维有限元数值模拟,得出当地裂缝垂直位移量达到20 cm时隧道出现开裂破坏,隧道结构抗裂设计时需分段设缝和扩大断面以适应地裂缝的大变形。基于数值模拟结果,建立地裂缝作用下地铁隧道与地裂缝正交和斜交条件下分段隧道三维运动位移模式,确定正交和斜交条件下结构抗裂的垂直位移、横向位移和轴向位移预留量。其结果可为西安地铁隧道穿越地裂缝带的结构设计提供参考。更多还原

【Abstract】 Xi’an metro under construction pass through many ground fissure active zones,the future large deformations of active ground fissure zones make a serious threat on Xi’an metro tunnel.The genesis,moving mode and profile characteristics of active ground fissures in Xi’an are analyzed,the active tendency and maximum vertical displacements of active ground fissures in the design life time of metro tunnel are estimated.The behaviors of metro tunnel passing through active ground fissure are studied with three-dimensional FEM,the results show that tunnel lining appears cracks when the vertical displacement of ground fissure increases to 20 cm,structural measures such as setting up seams in tunnel segmentation,adding flexible joints between segmented tunnel and enlarging tunnel lining cross-section should be adopted in structural design of metro tunnel passing through active ground fissure zones.Based on the deformation characteristics of active ground fissures and numerical simulation results,the three-dimensional moving model of metro tunnel which is perpendicular and oblique to active ground fissure zones,is respectively established,the reserved value of vertical,transverse and axial displacements for metro tunnel in design are calculated.The conclusions can be presented as the reference for lining structure design of tunnel passing through the ground fissure active zones.更多还原