富水软岩力学特性时效演化模式及隧道稳定性控制机制研究

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中图分类号：P642；U25 文献标识码：A 文章编号：2097-5465（2025）05-0067-09

Abstract：Thesuroundingrock mechanical propertiesof the water-rich softrock tunnelareseverelydegradedbywater，which greatlyreducesthstabilityofthetunel.Therefore，clarifyingthesofteningcharacteristicsofthemechanicalpropertiesofthe surroundingrockwhenencountering Waterandrevealingthestabilitycontrolmechanismofthesurroundingrockofthewater-rich tunnelhaveimportantguidingsignificanceforthedesignofsupportstructures．Therefore，thepaperfirstestablishesatimedependentevolutionmodelforthemechanicalpropertiesofsoftsuroundingrocksbystatisticallanalyzingthevariationofrock mechanicalpropertieswithwatercontentandtime.Atthesametime，basedonthetre-dimensionalspatialmechanicalffectsof softrock tunnelexcavationandthetheoryofelastic-plasticmechanics，anelastic-plasticcalculationmodelforthemechanical propertiesofsoftrocktunnelsuroundingrockconsideringthecouplingefectofsoftrock watersofteningtimeefectandtunnel constructionspatialefectwasestablished.Finally，throughparameteranalysis，thespatiotemporalevolutionlawofthestress displacementfieldofsoftsuroundingrockwasclarifed，andthestabilitycontrolmchansmofthesuroudingrockofthewater richsoftrock tunelwasrevealed.Inashortperiodof time，therockmechanicalpropertiesof thesoftandweaksuroundingock intherich waterareadeteriorateseverelyndhedeformationandplasticzonerangeofthesuroundingrockicreaserapidlyafter excavation.Therefore，inordertoensurethestabilityoftheunsupportedsectionoftheunnel，theinitialsupportstructureis quicklyappliedafterexcavationtovoidinstabilityofthsuroundingockintheunsupportedsectionduetolongconstructiontie.

Keywords：water-rich tunnel；soft surrounding rock；mechanical properties；timely mode；stability control

0 引言

围岩作为地下工程的特殊岩体，极易受到围岩所处环境的影响，进而对围岩的稳定性产生影响，如地下水对围岩的软化作用，难免会对围岩力学性能产生劣化影响，导致围岩稳定性下降。（剩余8751字）