支护参数对软弱围岩隧道辅助坑道支护结构的稳定性影响分析

Analysis on the Influence of Supporting Parameters on the Stability of Auxiliary Tunnel Supporting Structure in Weak Surrounding Rock

依托观音坪隧道辅助坑道施工实际,探究隧道结构在穿越软弱围岩时的稳定性问题,并探索最优支护参数。通过采用MIDAS GTS NX数值模拟软件,针对不同围岩等级、不同钢架间距以及不同初期支护材料建立模型,研究不同的围岩等级与支护组合,对初期支护变形及应力、锚杆轴向变形以及钢拱架最大变形等支护结构的稳定性影响。

Based on the actual construction of auxiliary adit of Guanyinping Tunnel,this paper explores the stability of the tunnel structure when it passes through the weak surrounding rock,and explores the optimal supporting parameters.MIDAS GTS NX numerical simulation software was used to establish models for different surrounding rock grades,different steel frame spacing and different initial support materials,and to study the influence of different combination of surrounding rock grades and support on the stability of initial support deformation and stress,axial deformation of anchor bolt and maximum deformation of steel arch structure.