The Deformation Mechanism and Control of Full-Section Curtain Grouting in Tunnels with Rich Water and Weak Surrounding Rocks
[Purposes]In order to further elucidate the diffusion law of grouting fluid and the mechanism of ground reinforcement and water stopping in the full section curtain of a tunnel with rich water and weak surrounding rock.[Methods]Taking the GZH-4 mined tunnel crossing the artificial lake bottom fully weathered rock layer in the Guan-Hui intercity as the background,the deformation of the tunnel face,the rate of core recovery,the horizontal convergence of the strata,and the surface subsidence were studied through on-site sample and numerical calculation analysis.In-depth analyses were done of the stratum reinforcement,water sealing,and the grouting slurry's diffusion law.The corresponding preven-tive measures were proposed.[Findings]The results show that the grouting veins'framework could unite with the nearby rock to form a stone body,which significantly increased the strength and permeability of the formation.High-pressure grouting caused the tunnel face to swell or crack.This phenomenon could be effectively avoided by precisely managing the initial grouting conditions and forecasting in advance.The full-section grouting of the tunnel could enhance the self-bearing capacity of the rock mass and ef-fectively suppress the horizontal clearance convergence of the tunnel.[Conclusions]The results of this study reveal the deformation mechanism of full-section curtain grouting in tunnels with rich water and weak surrounding rocks and propose corresponding control methods that can provide theoretical support and techni-cal guidance for rock mass grouting in similar geological environments.
water-rich and weakly fractured rock massfull-section curtain grouting of the tunnelstrengthening the formationimpermeability performance
万方数据
维普
