第18卷增刊2地下空间与工程学报Vol.182022年12月ChineseJournalofUndergroundSpaceandEngineeringDec.2022考虑流变效应的围岩支护时机和应力释放分析朱建林1,唐思聪2,刘志强1,曹彧2,陈鹏1(1.中铁西南科学研究院有限公司,成都611731;2.中铁二院工程集团有限责任公司,成都610031)摘要:在围岩变形分析中引入流变效应,同时考虑支护对围岩变形的影响,根据Laplace变换和逆变换,推导了支护抗力和围岩变形随时间变化的解析解,从作用机理角度分析了支护时机对支护受力和围岩变形的影响,分析了围岩应力释放随时间的变化规律。研究表明:通过与数值解进行对比,验证了解析解推导过程的合理性;支护时机与支护受力呈正相关关系,支护越早,支护受力越大,与围岩变形呈负相关关系,支护越晚,围岩变形越大,且在隧道开挖后的早期对二者的影响更大;隧道开挖后,围岩应力释放随时间呈现出短时间内快速增加然后缓慢增加最后保持不变的三阶段变化过程,该规律可为支护时机的合理选取提供一定的参考依据。关键词:流变;围岩;支护时机;应力释放中图分类号:O373文献标识码:A文章编号:1673-0836(2022)增2-0560-06AnalysisonSurroundingRockSupportTimingandStressReleaseConsideringRheologicalEffectZhuJianlin1,TangSicong2,LiuZhiqiang1,CaoYu2,ChenPeng1(1.ChinaRailwaySouthwestResearchInstituteCo.,Ltd.,Chengdu611731,P.R.China;2.ChinaRailwayEryuanEngineeringGroupCo.,Ltd,Chengdu610031,P.R.China)Abstract:Therheologicaleffectisintroducedintothedeformationanalysisofsurroundingrock,andtheinfluenceofsupportonsurroundingrockdeformationisconsidered,accordingtoLaplacetransformandinversetransform,theanalyticalsolutionsofsupportresistanceandsurroundingrockdeformationwithtimearederived.Theinfluenceofsupporttimeonsupportstressandsurroundingrockdeformationisanalyzedfromtheperspectiveofactionmechanism.Thevariationlawofsurroundingrockstressreleasewithtimeisanalyzed.Theresearchshowsthattherationalityofthederivationprocessoftheanalyticalsolutionisverifiedbycomparingwiththenumericalsolution.Thereisapositivecorrelationbetweenthesupporttimeandthesupportforce.Withtheearliersupport,thesupportforceisgreater,andthereisanegativecorrelationwiththesurroundingrockdeformation.Withthelatersupport,thesurroundingrockdeform...
