第43卷第1期2023年2月防灾减灾工程学报JournalofDisasterPreventionandMitigationEngineeringVol.43No.1Feb.2023软岩隧道预应力锚固系统中钢带的结构效应研究∗李金津1,汪波1,喻炜1,郭新新2(1.西南交通大学交通隧道教育部重点实验室,四川成都610031;2.成都理工大学环境与土木工程学院,四川成都610059)摘要:预应力锚固系统为核心的变形主动控制技术为隧道挤压大变形的治理开辟了新途径,作为其中协同支护的钢带,其受力特性及结构效应未明确。鉴于此,在分析钢带主要结构形式的基础上,理论分析与数值仿真结合,开展了软岩隧道预应力锚固系统中钢带的结构效应研究。研究结果表明:基于单跨简支梁理论,得到随钢带惯性矩增大,围岩(跨中)挠度和最大主应力均呈现“先急后缓再平”的减小趋势,以此建议软岩隧道优先采用W形钢带、且惯性矩>2.92E⁃01cm4;通过建立“预应力锚杆+钢带”与围岩作用模型,发现较单一预应力锚杆支护,钢带协同预应力锚杆支护具有更优的围岩变形控制效果和更佳的围岩应力改善功效,同时,锚杆的受力减小,相互间也更趋均匀。关键词:软岩隧道;预应力锚杆;协同作用;钢带;惯性矩中图分类号:U45;X947文献标识码:A文章编号:1672⁃2132(2023)01⁃0041⁃09StudyonStructuralEffectofSteelBeltofPrestressedAnchorageSystemforSoftRockTunnelLIJinjin1,WANGBo1,YUWei1,GUOXinxin2(1.KeyLaboratoryofTransportationTunnelEngineering,MinistryofEducation,SouthwestJiaotongUniversity,Chengdu610031,China;2.CollegeofEnvironmentalandCivilEngineering,ChengduUniversityofTechnology,Chengdu610059,China)Abstract:Theactivedeformation-controltechnologywiththeprestressedanchoragesystemasthecorehasopenedanewwayforthetreatmentoflargeextrusiondeformation.Asthesteelbeltforthecooperativesupport,itsmechanicalcharacteristicsandstructuraleffectsarenotclear.Inviewofthis,basedonanalyzingthemainstructuralformsofthesteelbelt,themethodofcombiningtheoreticalanal⁃ysisandnumericalsimulationisusedtostudythestructuraleffectofsteelbeltintheprestressedan⁃choragesystemofsoftrocktunnel.Theresultsshowthat:basedonthesingle-spansimplysupportedbeamtheory,itisobtainedthatwiththeincreaseofthemomentofinertiaofthesteelbelt,thedeflec⁃tionofthesurroundingrock(mid-span)andt...