浅埋双侧偏压小净距隧道围岩压力变化规律研究

Study on the Variation Law of Surrounding Rock Pressure in Shallow Buried Double-sided Biased Small Clear Distance Tunnel

为研究浅埋双侧偏压小净距隧道在不同影响因素下的围岩压力变化规律,以朝阳隧道为工程背景,采用FLAC 3D数值模拟软件,对浅埋双侧偏压小净距隧道在不同地表坡度、隧道埋深和隧道净距下的围岩位移场和塑性区的变化规律进行分析。结果表明:随着地表坡度和隧道埋深的不断增大,围岩位移和塑性区不断增大;随着隧道净距不断增大,围岩竖向位移呈现先增大再减小最后增大的变化,水平位移不断增大;当隧道净距较小时,隧道周围的塑性区域较大,净距增大时则相反。

In order to study the variation law of surrounding rock pressure in shallow buried double sided bias small spacing tunnels under different influencing factors,taking Chaoyang Tunnel as the engineering background,using FLAC 3D numerical simulation software,the variation law of surrounding rock displacement field and plastic zone in shallow buried double sided bias small spacing tunnels under different surface slopes,tunnel burial depths,and tunnel clearance was analyzed.The research results show that with the continuous increase of surface slope and tunnel burial depth,the displacement and plastic zone of surrounding rock continue to increase,while with the continuous increase of tunnel clearance,the vertical displacement of surrounding rock first increases,then decreases,and finally increases,and the horizontal displacement continues to increase.When the clear distance of the tunnel is small,the plastic area around the tunnel is larger,and the opposite is true when the clear distance is increased.