富水软弱围岩隧道全断面帷幕注浆变形机理及控制研究  

The Deformation Mechanism and Control of Full-Section Curtain Grouting in Tunnels with Rich Water and Weak Surrounding Rocks

作　　者：王荣飞 WANG Rongfei(Zhenjiang Planning Survey and Design Group Co.,Ltd.,Zhenjiang 212004,China)

机构地区：[1]镇江市规划勘测设计集团有限公司,江苏镇江212004

出　　处：《河南科技》2024年第2期52-58,共7页Henan Science and Technology

摘　　要：【目的】为进一步揭示富水软弱围岩隧道全断面帷幕注浆浆液扩散规律以及地层加固、防渗止水原理。【方法】以莞惠城际GZH-4标暗挖隧道穿越人工湖底全风化岩层为工程背景,通过现场取样及数值计算分析,对全断面帷幕注浆隧道的掌子面变形、岩层取芯率、地层水平收敛及地表沉降等进行探讨,深入分析隧道帷幕注浆浆液扩散规律及地层加固、防渗止水原理。【结果】结果表明:注浆浆脉构成的浆脉骨架可与周围岩体相黏接形成结石体,能有效提高岩体强度及地层抗渗透性能;高压注浆导致掌子面易于鼓胀或开裂,精准控制注浆初始条件和超前预测,可有效避免这一现象的发生;隧道的全断面帷幕注浆可增强岩体自承载能力,能有效抑制隧道的水平净空收敛变形;全断面帷幕注浆对富水软弱地层隧道开挖时的地表沉降有很好的抑制作用。【结论】研究成果揭示了富水软弱围岩隧道全断面帷幕注浆的变形机理,并提出了相应的控制方法,可为类似地质环境下岩体注浆提供理论支撑与技术指导。[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 preventive 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 effectively 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 technical guidance for rock mass grouting in similar geological environments.

关 键 词：富水软弱围岩 隧道全断面帷幕注浆 加固地层 防渗止水 

分 类 号：TU941[建筑科学—建筑技术科学]