地铁隧道斜交穿越地裂缝带的纵向设防长度  

The Longitudinal Fortified Length of Metro Tunnel Obliquely Crossing the Active Ground Fissure Zones

作　　者：黄强兵[1] 彭建兵[1] 高虎艳 王海祥[3] 

机构地区：[1]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]西安市地下铁道有限责任公司,陕西西安721000 [3]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《铁道学报》2010年第1期73-78,共6页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(4053402140772183)

摘　　要：以西安地铁1号线斜交穿越地裂缝带为工程背景,通过地裂缝活动的大型物理模型试验和有限元数值模拟,对西安地裂缝活动的影响范围和西安地铁1号线隧道穿越地裂缝带的纵向设防长度进行研究。结果表明:地裂缝活动时引起其上盘地层中出现应力降低和下盘地层中出现应力增强现象,且在垂直于地裂缝走向上其两侧地层中应力变化大致呈现出反对称分布特征。隧道设计埋深处地裂缝活动的影响区宽度为30 m,即上盘17.5m,下盘12.5 m;考虑安全系数时地铁隧道穿越地裂缝带的设防宽度为55 m,即上盘35 m,下盘20 m。根据地铁隧道与地裂缝带的斜交夹角,确定地铁区间隧道不同夹角斜交穿越地裂缝带的纵向设防长度。研究结果对西安地铁1号线区间隧道斜穿地裂缝带的结构处理及设计具有一定参考价值。Through a large-scale physical model test of ground fissures movement and FEM numerical simulation against the engineering background of Xi＇an Metro Line No. 1 obliquely intersecting active ground fissure zones, the influential zone of active ground fissures and designed longitudinal fortified length of the metro tunnel obliquely crossing the active ground fissure zones were studied. The results show as follows： Soil stress reducing appears in strata of the hanging wall of the ground fissure and soil stress intensifying appears in the foot- wall of the ground fissure, approximate anti-symmetric distribution of soil stresses appears on both sides of the ground fissure; the influential zone of active ground fissure is 30 m wide, i. e. , 17.5 m in the hanging wall and 12.5 m in the footwall of the ground fissure; considering the safety factor and active characteristics of the ground fissure, the suggested fortified width in design of the metro tunnel crossing the active ground fissure zone is 55 m, i. e. , 35 m in the hanging wall and 20 m in the footwall of the ground fissure; the longitudinal lengths of different sections of Xi＇an Metro Line No. 1 obliquely crossing active ground fissure zones are calculated according to different intersecting angles between the metro tunnel and the active ground fissures. The conclusions provide reference for the structural treatment and design of Xi＇an Metro Line No. 1 which obliquely crosses active ground fissure zones.

关 键 词：隧道工程 西安地铁1号线 地裂缝 模型试验 纵向设防长度 

分 类 号：U231.1[交通运输工程—道路与铁道工程]