2022·12·BuildingConstruction2836岩溶极发育地质条件下的旋挖灌注桩施工技术陈祖军1邓边员2许利东21.云南省建设投资控股集团有限公司云南昆明650501；2.云南建投基础工程有限责任公司云南昆明650501摘要：岩溶极发育地区存在见洞率高、竖向溶洞发育、溶洞充填物力学性质差、基岩面起伏较大、基岩内部溶蚀裂隙较发育等不良地质现象，采用传统旋挖成孔灌注桩施工工艺极易发生溶洞充填物坍孔、钻孔偏斜、漏浆、桩身混凝土流失、断桩等不良现象。基于此，对云南省典型岩溶极发育地区某高层建筑旋挖灌注桩施工参数（钻进压力、钻速、提钻速度等）进行分析，提出该地质条件下的最优施工参数，并利用地质钻孔注浆填充预处理和施工参数解决溶洞充填物垮塌问题，利用双钢护筒护壁解决土岩交界面存在的坍孔问题，从而提高施工工效，为类似工程的施工提供参考。关键词：岩溶极发育；钻孔灌注桩；地质钻孔预注浆；双钢护筒中图分类号：TU753文献标志码：A文章编号：1004-1001(2022)12-2836-05DOI：10.14144/j.cnki.jzsg.2022.12.008ConstructionTechnologyofRotaryDiggingCast-in-placeBoredPileUnderConditionofKarstExtremelyDevelopedGeologyCHENZujun1DENGBianyuan2XULidong21.YunnanConstructionandInvestmentHoldingGroupCo.,Ltd.,Kunming,Yunnan650501,China;2.YunnanConstructionEngineeringFoundationEngineeringCo.,Ltd.,Kunming,Yunnan650501,ChinaAbstract:IntheextremelydevelopedKarstarea,therearesomeunfavorablegeologicalphenomena,suchashighcavepenetrationrate,developmentofverticalKarstcaves,poorphysicalandmechanicalpropertiesofKarstcavefilling,largeundulationofbedrocksurface,andrelativelydevelopeddissolutionfissuresinbedrock.Thetraditionalrotarydiggingcast-in-placeboredpileconstructiontechnologyispronetocavecollapse,boreholedeflection,slurryleakage,pilebodyconcreteloss,pilebreakageandotheradversephenomena.Basedonthis,theconstructionparameters(drillingpressure,drillingspeed,drill-liftingspeed,etc.)ofahigh-risebuildinginatypicalKarstextremelydevelopedareainYunnanProvinceisanalyzed,andtheoptimalconstructionparametersunderthisgeologicalconditionareproposed.ThegeologicaldrillinggroutingfillingpretreatmentandconstructionparametersareusedtosolvethecollapseproblemofKarstcav...
