暗挖区间小角度穿越地裂缝设计研究

A Study of Tunneling Tunnels Across Earth Fissure from a Small Angle

结合西安地铁一号线半坡—纺织城区间的穿越地裂缝的情况,利用有限元计算分析了暗挖区间小角度穿越地裂缝的变形缝设置方式、断面形式等设计中遇到的问题。根据分析表明小角度穿越地裂缝,采用马蹄形断面通过,变形缝设置间距以15m和10m相结合较为合理。地裂缝活动是极为缓慢的过程,需要根据其对结构的影响进行监测和信息反馈,以促进地裂缝处理技术的发展完善。

With the tunnel of the Banpo-Textile City Section of the First Line of the Xi＇an metro running across the earth fissure as a practical example,the design of the space between deformation joints in the tunneling section of the tunnel across the earth fissure from a small-angle and problems arising in the section form design are dealt with and analyzed in the light of the Finite Element Method in the paper.The results of the analysis show that when tunneling a tunnel across the earth fissure from a small-angle the horse-shoe cross-section is most advisable,with the deformation joint space set to 15 meters and 10 meters most reasonable.In the future,it is advisable to promote the development and perfection of the treating techniques of earth fissure according to the data obtained from monitoring and information feedback on the effects of earth fissure on the structure.