考虑保护层特性与重车偏压影响的引水隧洞底板混凝土受力变形特征  

Stress and Deformation of Diversion Tunnel Floor Concrete Considering the Material Characteristics of Protection Layer and the Influence of Heavy Truck Bias Crush

作　　者：王湃 王康 刘清 杨磊[1] 屠文锋 王小龙 杨洋 WANG Pai;WANG Kang;LIU Qing;YANG Lei;TU Wen-feng;WANG Xiao-long;YANG Yang(Geotechnical&Structural Engineering Research Center,Shandong University,Jinan 250061,China;Sinohydro Bureau 14 Co.,Ltd.,Kunming 650041,China;Yunnan Central Water Diversion Engineering Co.,Ltd.,Kunming 650041,China;State key Laboratory of Mining Disaster Prevention and Control(Shandong University of Science and Technology),Ministry of Education,Qingdao 266590,China)

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]中国水利水电第十四工程局有限公司,昆明650041 [3]云南省滇中引水工程有限公司,昆明650041 [4]山东科技大学矿山灾害预防控制教育部重点实验室,青岛266590

出　　处：《科学技术与工程》2025年第7期2931-2942,共12页Science Technology and Engineering

基　　金：云南省重点研发计划(202103AA080016);国家自然科学基金青年科学基金(52209138);山东科技大学矿山灾害预防控制教育部重点实验室开放课题(JMDPC202404)。

摘　　要：在引水隧洞开挖与混凝土衬砌平行作业施工过程中,底板混凝土被重车碾压破坏严重影响施工质量。针对引水隧洞“边挖边衬”平行作业中由于重车碾压所导致的底板混凝土保护难题,利用ABAQUS建立底板保护数值计算模型,采用上覆“洞渣-混凝土”复合保护层的底板保护措施,开展隧洞底板成品混凝土保护数值模拟研究,分析保护层材料特性与重车偏压距离对底板受力变形的影响规律,评估不同工况下的底板保护效果。研究结果表明:该底板保护措施可有效提升底板混凝土保护效果,随着保护层混凝土标号提高,底板混凝土的受力与变形减小,减小率最高分别可达17.5%和12.4%,随着重车偏压距增大,底板混凝土最大变形量增大且变形区域范围扩散显著,且边缘处应力增长极其明显,最大增长率高达222.6%,研究结果可为隧洞底板混凝土防碾压破坏提供理论与技术指导。During the parallel operation of excavation and concrete lining construction in the diversion tunnel,the quality of construction was significantly affected due to the severe damage to the floor concrete caused by heavy truck crush.In response to the challenging problem of floor concrete protection caused by heavy truck crush during the“excavation-lining”parallel operation in the diversion tunnel,a numerical calculation model for floor protection was established using ABAQUS.Adopting the floor protection measure of overlaying“tunnel excavation debris-concrete”composite protection layer,a numerical simulation study on the protection of tunnel floor concrete was conducted.The influence patterns of the material characteristics of the protection layer and the bias distance of the heavy truck on the stress and deformation of the floor concrete were analyzed,and the effectiveness of protection under different working conditions was evaluated.The study results indicated that the floor protection measures could effectively improve the protection of the floor concrete.As the concrete grade of the protection layer increased,the stress and deformation of the floor concrete decreased,with the reduction rate reaching up to 17.5%and 12.4%respectively.Furthermore,as the bias distance of the heavy truck increased,the maximum deformation of the floor concrete increased,and the range of deformation expanded significantly.Moreover,stress growth was extremely pronounced at the edges,with a maximum growth rate of up to 222.6%.The research results can provide theoretical and technical guidance for the protection of the floor concrete against crush damage in the diversion tunnel.

关 键 词：引水隧洞 边挖边衬 偏压碾压 底板保护 数值模拟 

分 类 号：TV544[水利工程—水利水电工程]