浅埋偏压双洞隧道开挖支护模拟分析研究

Simulation Analysis and Study of Shallow Buried Offset Double Tunnel Tunnel Excavation Support

本文依托蒋峪隧道项目,采用COMSOL软件进行建模分析,考虑0kPa、100kPa、200kPa、300kPa洞壁围压下,浅埋偏压双洞隧道的应力和变形规律,主要结论为:(1)随着隧道洞壁支护压力增加,应力分布形态仍保持两侧大、上下小的特点。(2)随着隧道洞壁支护应力增加,塑性区域的覆盖范围减小。(3)支护后,竖向沉降减小幅度由大到小排序:中部、左侧、右侧。(4)隧道洞室内壁各部位应力由大到小排序:拱腰、拱底、拱顶。(5)在300kPa围压支护条件下,整个设计周期中,左线隧道的拱顶沉降约为377mm,右线隧道的拱顶沉降约为154mm。

Based on Jiangyu Tunnel project,COMSOL software is used for modeling analysis,considering the stress and deformation rules of shallow buried bias double hole tunnel under 0kPa,100kPa,200kPa and 300kPa.The main conclusions are as follows:(1)With the increase of the tunnel wall support pressure,the stress distribution pattern is still large on both sides and small on both sides.(2)With the increase of the tunnel wall support stress,the coverage range of the plastic area decreases.(3)After support,the vertical settlement decreases from large to small:middle,left and right.(4)The stress of each part of the inner wall of the tunnel chamber ranks from large to small:arch waist,arch bottom and vault.(5)Under the condition of 300 kPa enclosure support,the settlement of the left line tunnel is about 377mm,and the settlement of the right line tunnel is about 154mm.