富水岩溶越江盾构隧道注浆材料试验与应用研究  

Experiment and application for grouting materials for karst under conditions of underground water flow before shield tunneling

作　　者：张聪[1] 阳军生[1] 谢亦朋 龚方浩 梁雄 雷金山[1] 苏保柱 ZHANG Cong;YANG Junsheng;XIE Yipengl;GONG Fanghao;LIANG Xiong;LEI Jinshan;SU Baozhu(School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;China Railway 14th Bureau Group Tunnel EngineeringCo.,Ltd,Jinan,Shandong 250013,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中铁十四局集团隧道工程有限公司,山东济南250013

出　　处：《岩石力学与工程学报》2018年第9期2120-2130,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金："十三五"国家重点研发计划(2016YFC0802500)~~

摘　　要：考虑传统材料难以同时满足富水岩溶充填注浆与后续盾构掘进要求,研制一种环保型可控膏状注浆材料(TGM)。通过大样本室内试验,测试TGM材料的主要性能参数及其在岩溶水下浆材的特性,最后将研究成果成功应用于长沙地铁3号线水下岩溶越江盾构隧道注浆工程。研究结果表明:研制的TGM材料具有凝结时间快、屈服应力增长迅速、流动度高、析水率低、结石体收缩率小以及早期强度起效快,后期强度适中等特点;当注浆材料黏土原浆相对密度为1.30,水固比1∶1,添加剂a掺量1%,添加剂b掺量0.15%时,TGM材料的主要性能最优;岩溶水流速低于1 m/s,留存率可达75%以上,岩溶水养护条件下结石体完全压滤后12 h抗压强度可达2MPa,90 d抗压强度8 MPa,渗透系数低至10-7 cm/s,微观结构显示内部呈明显的块团状稳定结构。通过现场注浆应用表明,TGM材料能有效填充水下岩溶,浆液与岩溶充填物胶结紧密,渗透系数降至4.7×10^(-5) cm/s,后续盾构掘进过程无异常突变情况,盾构机姿态可控,注浆与掘进效果达到预期。可以预见,TGM是一种比较理想的水下岩溶越江盾构隧道注浆材料。Normal materials are difficult to satisfy the requirements of filling and grouting the water rich karst for subsequent shield tunneling,an environmentally friendly controllable paste grout（TGM） is thus developed.The main performance parameters of TGM material and the behavior of grout in underwater Karst were tested through laboratory test on large samples.The TGM materials were successfully applied to grout the underwater karst in the project of the river cross shield tunnel of Metro Line 3 in Changsha.The TGM material solidifies fast,increases fast in strength,has high fluidity,low rate of water desorption,low rate in volume contraction and rapid onset of early strength,moderate late strength.When the clay pulp accounts for 1.30,the ratio of water to solid additives 1∶1,the content of additives a is 1%,and the content of additive b is 0.15%,the main performance of TGM is the best.Karst water flow rate is lower than 1 m/s,the retention rate is above 75%.The karst water cured grout after 12 h of solidification has the compressive strength of up to 2 MPa,90 d compressive strength 8 MPa,permeability coefficient 10-7 cm/s and has a stable microstructure.The on-site grouting application shows that TGM material can effectively fill the water karst,the permeability coefficient is approaching 4.7×10-5 cm/s,the shield tunnels successfully.

关 键 词：隧道工程 越江盾构隧道 富水岩溶 注浆 TGM材料 长沙地铁3号线 

分 类 号：U45[建筑科学—桥梁与隧道工程]