喀斯特地质突涌水对城市隧道影响及注浆堵水措施研究

Research on the Impact of Karst Geological Sudden Water Inflow on Urban Tunnels and Grouting for Water Blocking Scheme

喀斯特地质区域因其特殊的地质构造和地表形态,经常遭遇突涌水等水文地质问题,对城市隧道的稳定性和安全性构成潜在威胁。本文结合现场监测及数值模拟方法探究了喀斯特地质突涌水对城市隧道的影响,并提出了相应的注浆堵水方案。研究结果表明:根据不同位置变形量变化速率可将整个监测期内的变形划分为三个阶段即快速变化阶段、缓慢发展阶段及趋于稳定阶段;可将溶腔水头为10 m时作为临界溶腔水头值;水源压力大于0.5 MPa时隧道发生突涌水且随着水源压力的增大,突涌水量不断增大;填充物厚度小于10 m时隧道发生突涌水且随着填充物厚度的减小,突涌水量不断增大。采用注浆堵水方案及时治理了隧道开挖支护期间的渗漏水,有效确保了施工质量,减少了施工人员及机械设备的闲置浪费,节约了成本。

Due to its unique geological structure and surface morphology,karst geological areas often encounter hydrogeological problems such as sudden water inflow,which pose potential threats to the stability and safety of urban tunnels.This article combines on-site monitoring and numerical simulation methods to explore the impact of karst geological sudden water inflow on urban tunnels,and proposes corresponding grouting for water blocking scheme.The research results indicate that the deformation during the entire monitoring period can be divided into three stages based on the rate of change in deformation at different locations:rapid change stage,slow development stage,and stabilization stage.When the water head of the dissolution chamber is 10 m,it can be used as the critical water head value of the dissolution chamber.When the water source pressure exceeds 0.5 MPa,a sudden water inflow occurs in the tunnel,and as the water source pressure increases,the amount of sudden water inflow continues to increase.When the thickness of the filling material is less than 10 m,a sudden water inflow occurs in the tunnel,and as the thickness of the filling material decreases,the amount of sudden water inflow continues to increase.The grouting for water blocking scheme was adopted to timely treat the leakage water during tunnel excavation and support,effectively ensuring construction quality,reducing idle waste of construction personnel and mechanical equipment,and saving costs.