偏压隧道施工方案选型及地质灾害评价

Selection of Construction Scheme for Biased Tunnel and Evaluation of Geological Hazards

针对偏压隧道施工方案会引发地质灾害的问题,结合某公路扩建项目偏压隧道区段,基于偏压隧道施工引发地质灾害的评价结果,采用FLAC软件模拟偏压隧道2种典型断面初衬施工工况,计算分析各断面隧道的竖向位移、水平位移、混凝土衬砌层弯矩与锚杆轴力。结果表明,偏压隧道进出口拱顶、侧脚部位和拱底受力较大,拱顶和拱底部位竖向位移最大,拱左下脚水平位移最大,施工时应加强这些部位的支护措施。

In view of the problem of the geological disaster caused by the bias tunnel construction scheme, combined with the bias tunnel section of a highway expansion project, based on the evaluation results of geological disasters caused by bias tunnel construction, FLAC software was used to simulate the initial lining of two typical sections of the bias tunnel, and the vertical displacement, horizontal displacement, concrete lining layer bending moment and anchor axial force of each section tunnel were calculated and analyzed. The results show that the stress on the vault, side foot and arch bottom of the entrance and exit of bias tunnel is greater, the vertical displacement of the vault and the arch bottom is the largest, and the horizontal displacement of the left foot is the largest. The supporting measures of these parts should be strengthened during construction.