论文部分内容阅读
库尉输水隧洞前段地下水位远高于洞顶(均在洞顶10 m以上),洞内呈淋雨状,施工过程中塌方事故频发,多处洞顶形成塌方廊道,给工程施工和长期运行造成了隐患。在对塌方事故调查和分析的基础上,通过有限差分软件FLAC3D对其坍塌机制进行系统的研究,并对典型塌方洞段的加固效果进行论证。研究表明:(1)地层岩性是该隧洞塌方事故频发的内在原因,地下水进一步增加了坍塌的可能性(致使洞周变形增加了约2.0倍);(2)初期支护不及时和开挖循环进尺过长是塌方事故发生的直接原因(致使洞周变形分别增加了约0.8和0.2倍);(3)加固处理方案的合理性和施工质量的可靠性对隧洞的安全稳定性至关重要。
The underground water level in the front of Kuwei Water Conveyance Tunnel is much higher than that of the top of the tunnel (all above the top of the tunnel for more than 10 m), and the inside of the cave is rainy. The landslide accidents occur frequently in the construction process, And long-term operation caused a hidden danger. Based on the investigation and analysis of the landslide accident, the collapse mechanism was systematically studied by the FLAC3D finite difference software, and the reinforcement effect of typical cave sections was demonstrated. The results show that: (1) Formation lithology is the internal cause of frequent tunnel collapse accidents. Groundwater further increases the possibility of collapse (resulting in an increase of about 2.0 times in the deformation of the cave); (2) The initial support is not timely and open Long digging cycle is a direct cause of landslip accidents (resulting in an increase of about 0.8 and 0.2 times in the deformation of the cave); (3) The rationality of the reinforcement treatment program and the reliability of the construction quality of the safety and stability of the tunnel important.