地铁盾构用高黏度速凝触变泥浆配制及应用  

Preparation and application of high viscosity fast curing thixotropic slurry for metro shield tunneling

作　　者：李子华 LI Zihua(Guangdong Construction Co.,Ltd.of China Railway No.3 Engineering Group Co.,Ltd.,Guangzhou Guangdong 511493,China)

机构地区：[1]中铁三局集团广东建设工程有限公司,广东广州511493

出　　处：《现代城市轨道交通》2024年第5期104-111,共8页Modern Urban Transit

摘　　要：为适应深圳市轨道交通14号线工程昂鹅车辆段试车线盾构机始发防水及掘进过程中地层沉降控制需要,通过对不同种类泥浆用土、水玻璃固化剂比较及泥浆黏度变化规律试验,配制出一种以膨润土、水玻璃、水玻璃固化剂为主要材料的高黏度防水触变泥浆。该种泥浆生产成本低廉,现场生产工序简单,成品浆液前期黏度低、可注性好,随龄期增长,黏度有较大幅度提升,可较好满足盾构机始发及掘进过程的防水需要。同时,因其具备较高的承载能力,在掘进过程中地层沉降控制、掘进线形纠编方面同样可以应用,结合常规的施工控制措施、监控量测和地质雷达检测手段,证明高黏度触变泥浆在盾构施工中应用效果显著,特别是浅覆土且沉降控制严格的盾构或顶管工程。To meet the waterproofing requirements for shield tunneling machine launching and ground settlement control during the excavation process at the train testing line project for the Ang'e depot of Shenzhen metro line 14,based on the viscosity change law of the slurry,a high viscosity waterproof thixotropic slurry was prepared by comparing and testing the different clay used in slurry and water glass hardeners.This slurry is mainly composed of bentonite,water glass,and water glass hardeners.The slurry production is optimized in terms of cost with a simple preparation process and is characterized with a low viscosity of the finished slurry in the early stage,which brings better grouting performance.As its age increases,the viscosity significantly increases,which better satisfies the waterproof requirements of the shield tunneling machine during the launching and excavation process.At the same time,due to its high load capacity,it’s also suitable for settlement control and excavation alignment correction during the excavating process.Combined with conventional construction control measures,monitoring measurement and geological radar detection methods,it has been proven that the remarkable effect has been achieved by applying high viscosity thixotropic slurry in shield tunneling construction,especially in shield tunneling or jacking constructions with shallow cover and strict settlement restriction.

关 键 词：地铁盾构 膨润土 水玻璃 固化剂 高黏度 

分 类 号：U25[交通运输工程—道路与铁道工程]