基于数值模拟的深埋输水隧洞支护研究与安全评价

结合国内外的研究成果，研究不同支护情况下隧洞掌子面的安全情况，运用FLAC3D软件模拟不同围岩条件和二次衬砌厚度下隧洞水平收敛值与拱顶沉降值，总结出隧洞开挖的一般规律。同时计算二次衬砌的安全系数，得出了最危险截面的位置，进行二次衬砌不同位置的安全评价。通过数值分析与以往的施工经验，给出输水隧洞的不同围岩区域的支护方式，并给出全隧洞的安全评价，提出施工建议措施。

Study on Supporting of Deep Buried Water-conveyance Tunnel Based on Numerical Simulation and the Safety Evaluation

According to the domestic and foreign research achievements, the safety of tunnel face under different supporting conditions was studied in such manner that, with FLAC3D software, the horizontal convergence and vault subsidence of tunnel in different surrounding rock conditions and different secondary lining thickness, were simulated so as to summarize the general law of tunneling; at the same time, the safety coefficient of secondary lining was calculated to find out the most dangerous section and make the safety evaluation on different parts of the secondary lining. Depending on the numerical analysis and the previous construction experience, the supporting method in different rock areas along water-conveyance tunnel was provided with the safety evaluation on the tunnel and the suggestions on the construction measures.