分岔隧道相交区围岩变形规律的数值模拟

Numerical simulation of deformation laws of surrounding rock at the intersection of bifurcate tunnel

针对大连地铁促春段横通隧道建设工程,采用有限差分软件FLAC^(3D)对0°~90°不同相交角的斜T型分叉岔隧道进行了数值模拟,通过分析变形数据、变形云图、变形矢量图以及实测数据的分析对比,得出相交区围岩变形规律.模拟结果表明:横通道的建设造成交叉区的围岩2次扰动,交叉角为15°时围岩扰动最大;交叉角度在45°~90°之间时由交叉角度造成的围岩变形量并不明显而交叉角度在15°~45°之间很明显;斜隧道开挖造成的交叉区围岩的2次变形量,小于主隧道开挖时造成的围岩变形量.

As a kind of complex tunnel form, the bifurcate tunnel will come across the choice of the best intersecting angle and understand the deformation law of surrounding rock at the intersection. Based on the project of cross tunnel in the cu-chun interval of Dalian Metro as background, the process of construction of T bifurcate tunnel which angle range from 00 to 90 are simulated by using finite different method software FLAC3D. The deformation law of intersection is concluded by simulative data, deformation nephogram, deformation vector diagram from FLAC3D simulation and measured data. Result of simulation show that the construction of inclined channel causes the surrounding rock disturbed. When intersecting angle is 15°, disturbance of surrounding rock is the largest. The variation of surrounding rock deformation is not obvious when intersecting angle between 45° and 90°, but it is quite obvious when angle between 15° and 45°. The deformation of the surrounding rock caused by excavation of inclined channel is less than the excavation of main tunnel.