浅埋风化岩质隧道初支护后黏弹性变形性态分析

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1、第26卷第9期岩石力学与工程学报Vol.26No.92007年9月ChineseJournalofRockMechanicsandEngineeringSept.，2007浅埋风化岩质隧道初支护后黏弹性变形性态分析许建聪(同济大学地下建筑与工程系，上海200092)摘要：为分析浅埋风化岩质隧道围岩初支护后变形随时间变化的黏弹性效应，首先采用逆反分析法推导出圆形隧道围岩的等效弹性模量和等效侧压力系数的解析解；然后结合具体工程实践，选择典型断面采集围岩初支护后的位移实测数据，采用数理统计方法，获取该类型隧道围岩初支护后的等效侧压力系数与等效弹性模量之比随时间的变化规律，建

2、立围岩初支护后的黏弹性模型，研究隧道围岩初支护后变形随时间变化的黏弹性效应。研究结果表明：浅埋风化岩质隧道围岩初支护后在无降雨等外部因素作用下等效侧压力系数与等效弹性模量之比随时间呈Monomolecular增长模式并最终稳定于某一常数，即围岩变形随时间变化的黏弹性效应也符合此规律，并且其应变与等效侧压力系数成反比变化；在围岩刚度较大和地下水活动较弱的地段，初支护后围岩变形将较快趋于稳定。关键词：隧道工程；浅埋风化岩质隧道；逆反分析法；数理统计；黏弹性效应中图分类号：U45文献标识码：A文章编号：1000–6915(2007)09–1781–06ANALYSISOFV

3、ISCOELASTICDEFORMATIONBEHAVIOROFSHALLOW-BURIEDDECOMPOSED-ROCKTUNNELAFTERPRELIMINARYSUPPORTXUJiancong(DepartmentofGeotechnicalEngineering，TongjiUniversity，Shanghai200092，China)Abstract：Inordertoanalyzetheviscoelasticeffectofshallow-burieddecomposed-rocktunnelsurroundingrockdeformationwit

4、htimeafterpreliminarysupport，theanalyticsolutionsofequivalentelasticmodulusandequivalentcoefficientofconfiningpressurewerederivedadoptinginversebackanalysismethodsfirstly.Secondly，takingtheconcreteengineeringpracticeofshallow-buriedandblindexcavateddecomposed-rocktunnelforexample，whichb

5、elongstotheshoresegmentofXiang′ansubseatunnelengineeringinXiamen，FujianProvince，andtherepresentativesectionsandcollectingtheirsurroundingrockmeasureddisplacementdataafterpreliminarysupportareselected，theregularityoftheratioofequivalentcoefficientofconfiningpressuretoequivalentelasticmod

6、ulusvaryingwithtimeaftersurroundingrockpreliminarysupportofthistypetunnelwasderivedbytheanalyticmeansofmathematicstatistics；andtherepresentativesectionsandcollectingtheirsurroundingrockmeasureddisplacementdataafterpreliminarysupportareselected.Finally，theviscoelasticmodelofsurroundingro

7、ckdeformationafterpreliminarysupportisestablished；anditsviscoelasticeffectofdeformationwithtimewasresearched.Theresearchresultsshowthatinthefirstplace，theratioofequivalentcoefficientofconfiningpressuretoequivalentelasticmodulusincreasesinmonomoleculargrowthmodelwithoutexternala