新建放空冲砂隧洞开挖及支护数值模拟研究

Numerical Simulation Study on Excavation and Support of Newly Built Blasting Sand Tunnel

现有隧洞开挖时两帮变形程度较大,隧洞稳定性低,为此,研究新建放空冲砂隧洞开挖及支护数值模拟。以龙颈下水库新建放空冲砂隧洞为研究对象,获取新建放空冲砂隧洞开挖与支护方案,并设置相关参数。运用FLAC3D有限差分软件对其进行数值模拟。模拟结果表明,隧洞两帮变形收敛量均在60 mm之内,收敛量明显减小,增长速度较为平缓,基本控制了隧洞两帮的变形程度,整体施工效果较好。

The deformation of the two sides is significant.The stability of the tunnel is low.Therefore,the numerical simulation of excavation and support of newly built blasting sand and flushing tunnel is studied.Taking the newly built emptying and sand flushing tunnel of Longjingxia Reservoir as the research object,the excavation and support plan for the newly built emptying and sand flushing tunnel is obtained.And the relevant parameters are set.The numerical simulation was carried out by using FLAC3D finite difference software.The simulation results show that the convergence of deformation on both sides of the tunnel is within 6Omm,with a significant decrease in convergence and a relatively gentle growth rate.The deformation degree of both sides of the tunnel is basically controlled.The overall construction effect is good.