盾构隧道穿越岩溶区注桨加固对地层及管片的影响

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Abstract：TheXiaoshui shieldtunelingsectionoftheGuangxi branch linealong the Xinjiangcoal-to-gaspipelineforexternal transmission，locatedinthekarst-developedregionofYongzhou City，HunanProvince，employsslurrybalanceshieldtuneling technologytotraversestronglydevelopedarststrata（karstandform）.Byfocusingonfourheterogeneouskarstcaves（fulfilled， partillyileandfild）istrbutedoundtuel，dimensioalfuddoupligumercalodelwaabld basedontheZK1ltypicalcross-section.Theinflunce mechanismsof thespatialdistributionofkarstcavesonsuroundingrock stabilityandteefectivensofgoutingeinforementweresystematicallyinvestigatedResultsindicatetatinuntreatedsenaios， theplasticzosofrckslbsetwenas1/andtheteloeintercoted，adngtoiumselemenof0.49m anda peak segment stress of1.76 MPa.Aftercement mortarreinforcement，te maximum ground settlementdecreases by 22.4%（0.38mm ） segment stress reduces by 4.6%＼～8.2 % ，and plastic zone volume diminishes by 58.7% . The findings reveal the progressive failure mechanismofsuroundingrockinkarst shieldtunnelsand proposeatreatmentthresholdforkarstcaves basedonplasticzone conectivitycriteria.Thisresearchprovidesafluid-solidcouplinganalysismethodandprocessoptimizationframewrkforriskontrol in the Xiaoshui Tunnel and similar engineering projects.

Keywords：shieldtunnel; karststrata;numericalsimulation;suroundingrockinstability;plasticzone;groutingreinforcement

在我国岩溶发育地区，盾构隧道工程建设常面临复杂地质挑战。（剩余7758字）