西安地铁工程涉及的地裂缝灾害与隧道设防

Ground Fissure Disaster and Tunnel Fortification Involved in Xi'an Subway Project

以西安地铁6号线隧道工程穿越地裂缝为研究背景,通过现场调查与资料收集,具体分析地裂缝在与地铁线路交汇处的发育和灾害特征及其年活动速率;利用空间几何关系,提出相邻分段隧道之间在空间上会产生三向位移,从而引起其内部净空减小;运用数学公式定量计算得到地铁6号线穿越地裂缝的纵向影响长度参数。建议在设计地铁线路走向时,应尽量与地裂缝呈大角度相交。

Based on the field investigation and data collection, the development and disaster characteristics of the ground fissure at the intersection with the metro line and its annual activity rate were analyzed in detail by studying the tunnel of Xi＇an Metro Line 6 crossing ground fissure. Using the spatial geometrical relationship, it was proposed that the three-way displacement between the adjacent segmental tunnels will be generated, which will cause the decrease in internal clearance. And the mathematical formula was used to calculate the longitudinal influence length of the Xi＇an Metro Line 6 crossing ground fissure. It is suggested that the metro line should be designed to intersect the ground fissure at a large angle.