摘要
我国西南地区多山岭且地下水丰富,公路隧道在修建过程中面临的水文地质条件复杂多变,国内外大量工程实践表明,隧道在穿越高承压水岩溶地质时,由于围岩岩溶发育、自稳能力差、岩溶水丰富且水压力较高等特点常易发生突泥、涌水甚至塌方等工程灾害,为此开展基于流固耦合的高承压水岩溶隧道加固措施研究,并以巫溪隧道为依托工程,通过对采用不同加固措施包括帷幕注浆、超前小导管及径向注浆系统锚杆的隧道施工进行数值模拟,对比分析不同加固措施的效果。结果表明:1)隧道仅施作初期支护时,高承压水岩溶隧道易发生整体失稳破坏;2)采用帷幕注浆加固措施后,围岩变形及塑性区得到有效控制;3)采用帷幕注浆+超前小导管+径向注浆系统锚杆控制围岩变形效果更加显著,可进一步为隧道提供安全储备;4)根据加固效果及经济成本控制,推荐方案为帷幕注浆+径向注浆系统锚杆。
The southwestern region of China is mountainous and rich in groundwater.The hydrogeological conditions faced by highway tunnels during construction are complex and varied.Numerous engineering practices at home and abroad have shown that when tunnels pass through high pressure karst geology,they are prone to engineering disasters such as mud bursts,water inrush,and even collapse due to loose surrounding rock,poor self stabilization ability,abundant pore water,and full pore water pressure.For the purpose,research on reinforcement measures for high pressure water karst tunnels based on fluid structure coupling was carried out.In this paper,Wuxi Tunnel was used as a supporting project.Through numerical simulation of tunnel construction using different reinforcement measures,including curtain grouting,advanced small conduits,and radial system anchor rods,the effects of different reinforcement measures were compared and analyzed.The results show that:1)High pressure karst tunnels are prone to overall instability and damage,when only initial support is applied to the tunnel;2)After adopting curtain grouting reinforcement measures,the deformation and plastic zone of the surrounding rock are effectively controlled;3)The use of curtain grouting,advanced small conduits,and radial system anchor rods to control the deformation of surrounding rock has a more significant effect,which can further provide safety reserves for the tunnel;4)Based on the reinforcement effect and economic cost control,the recommended solution is curtain grouting+radial system anchor rod.
作者
王建华
樊戬
WANG Jianhua;FAN Jian(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067;China Communications Construction General Contracting Operation Branch,Beijing 100088)
出处
《公路交通技术》
2024年第3期133-140,共8页
Technology of Highway and Transport
关键词
流固耦合
帷幕注浆
加固措施
flow-solid coupling
curtain grouting
reinforcement measures
