基于水泥-地聚合物公路隧道衬砌裂缝修复试验研究  

Experimental Study on Lining Crack Repair with Geopolymer-cement Composite Material in Highway Tunnel

作　　者：韩颖异 崔达 HAN Ying-yi;CUI Da(Architectural Design&Research Institute of Zhejiang University Co.,Ltd.,Hangzhou,Zhejiang 310000,China;China Highway Engineering Consulting Corporation,Beijing 100089,China)

机构地区：[1]浙江大学建筑设计研究院有限公司,浙江杭州310000 [2]中国公路工程咨询集团有限公司,北京100089

出　　处：《公路交通科技》2024年第5期118-124,共7页Journal of Highway and Transportation Research and Development

摘　　要：为了研究地聚合物材料对隧道衬砌裂缝的修补效果和影响因素,通过隧道衬砌裂缝诊断与处治模拟平台开展裂缝修补试验研究。根据公路隧道马蹄形断面衬砌受力特点,平台通过两个拱形钢架来模拟衬砌轮廓形状并通过钢架绕铰支座转动实现裂缝修补截面非均布张拉的受力形态。基于该平台分别开展稳定状态、发展状态、不同渗漏水状态下的裂缝修补试验,并通过张开应力和张开后截面浆液分布形态来评价纯地聚合物、纯水泥砂浆、水泥+地聚合物3种材料的实际修补效果,分析不同材料组合、衬砌裂缝状态、以及渗水量对修补效果的影响并给出相关工程建议。结果表明:水泥作为一种碱激发剂能与地聚合物材料发生反应,水泥+地聚合物的裂缝修补效果要优于纯水泥砂浆或纯地聚合物。水泥+地聚合物组合材料的裂缝修补效果随张开加载速率增大而减弱,加载速率30 N/h工况下的黏结张拉应力为10 N/h工况下的46%,仅为无张力工况下的40%,建议衬砌裂缝基本稳定后再开展修补工作。水泥+地聚合物组合材料的修补效果随裂缝位置渗漏量增大而减弱,渗水状态(1 mL/min)对修补效果影响相对较小,7 d和28 d时的修补效果分别降低22%和19%,可直接进行裂缝修补;涌水状态下(20 mL/min)7 d和28 d时的修补效果分别降低42%和38%,不宜直接进行修补。To investigate the effect of geopolymer on tunnel lining crack repair and the influencing factors involved,the experimental study is carried out by using a simulation platform for crack diagnosis and treatment in tunnel lining structures.Based on the stress characteristics of horseshoe-shaped lining of highway tunnel,a platform is used to simulate lining profile through two arch steel frames.By rotating the steel frames around hinge support,the non-uniform tension of crack repair on section is achieved.Tests on crack repair under stable state,developing state,and different leakage conditions are conducted on this platform.The evaluation is based on the stress distribution and paste distribution of section after opening to assess the actual repair effects of 3 materials of pure polymer,pure cement mortar,and cement+polymer.The study analyzes the influence of different material combinations,lining crack conditions,and water leakage on repair effects,and provids relevant engineering recommendations.The result indicates that,as an alkali activator,the cement can react with polymer materials.The crack repair effect of cement+polymer is superior to pure cement mortar or pure polymer.The crack repair effect of cement+polymer composite material weakens as the opening loading rate increases.The bonding tension stress under a loading rate of 30 N/h is 46% of that under 10 N/h,and only 40% under no tension conditions.It is recommended to carry out repair work after the lining crack is basically stable.The repair effect of cement+polymer composite material weakens as the leakage amount at crack location increases.The effect of water seepage(1 ml/min)on repair is relatively small,with repair effects decreasing by 22% and 19% at 7d and 28 d respectively,allowing direct crack repair.Under gushing water conditions(20 ml/min),the repair effects at 7 d and 28 d decrease by 42 and 38% respectively,making direct repair inadvisable.

关 键 词：隧道工程 裂缝修补 裂缝诊治平台 水泥-地聚合物 衬砌裂缝 

分 类 号：U457[建筑科学—桥梁与隧道工程]