盾構(gòu)隧道穿越巖溶區(qū)注槳加固對地層及管片的影響

打開文本圖片集

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

在我國巖溶發(fā)育地區(qū)，盾構(gòu)隧道工程建設(shè)常面臨復(fù)雜地質(zhì)挑戰(zhàn)。（剩余7758字）