陡坡偏压小净距隧道合理施工方法研究
Research on reasonable construction method of bias tunnels with small interval and steep slope

为了确定陡坡偏压条件下小净距隧道的合理施工方法,结合工程实例,考虑单侧壁导坑法与环形开挖留核心土法的3种不同组合下的施工方案,通过有限元软件ABAQUS建立三维弹塑性分析模型,对V级围岩陡坡偏压条件下小净距隧道的3种不同施工方案进行施工全过程数值模拟,重点分析隧道开挖对地表、围岩等的扰动效应,包括地表位移、围岩塑性区以及围岩特征区域的位移,确定了单侧壁导坑法为陡坡偏压条件下小净距隧道的合理施工方法,研究结果可为类似条件下陡坡偏压小净距隧道的设计、施工提供借鉴。
In order to determine the reasonable construction method of bias tunnels with small interval and steep slope, a engineering example is analysed, with the consideration of three different combination of the construction scheme of slide drift method, ABAQUS is used to establish the model of 3D elasto plastic analysis. Three construction methods of interval tunnel is simulated under the condition of V-grade rock and biased slope. The effect of tunnel excavation disturbance on the surface and the surrounding rock is analysed, including surrounding rock surface displacement, plastic zone and displacement of surrounding rock characteristic region. The single side drift method is a reasonable construction method of steep slope bias conditions of small interval tunnel. The results can provide the reference for the design and construction under similar conditions of bias tunnels with small interval and steep slope