建筑施工·第44卷·第12期2841桩基础冲击钻成孔在坚硬倾斜岩层中偏钻的水下爆破解决法毕伟郑磊张顺张丽萍祝能清云南建投第六建设有限公司云南昆明650217摘要:为解决西南地区岩溶地质条件下坚硬倾斜岩层中,桥梁桩基冲击成孔施工中遇到偏钻且偏钻位置不能突破的问题,通过实践,采用乳化炸药水下爆破的方法,并辅以测绳法绘制水下地形图、倾斜岩层爆破处理、钻孔深度计算等,在较少处理次数内迅速突破偏钻位置,解决了偏钻问题。冲击钻成孔与水下爆破相结合,可以适用于岩溶地质条件下的坚硬倾斜岩层,同时减少了卡钻事故,提升了桩基质量,并缩短了施工工期。关键词:桩基础;冲击钻成孔;岩溶;灰岩;偏钻;乳化炸药;水下爆破中图分类号:TU753文献标志码:A文章编号:1004-1001(2022)12-2841-03DOI:10.14144/j.cnki.jzsg.2022.12.009UnderwaterExplosionMethodforSolvingDeviationDrillingofPileFoundationPunchDrillPore-forminginHardInclinedRockStratumBIWeiZHENGLeiZHANGShunZHANGLipingZHUNengqingYCIHNo.6ConstructionCo.,Ltd.,Kunming,Yunnan650217,ChinaAbstract:InthehardandinclinedrockstratumundertheKarstgeologicalconditionsofSouthwestChina,theproblemofdeviationdrillinganditspositioncannotbebrokenthroughisencounteredintheconstructionofpunchdrillpore-formingforbridgepilefoundation.Themethodofunderwaterblastingwithemulsionexplosiveisadopted,andtheunderwatertopographicmap,inclinedrockblastingtreatmentanddrillingdepthcalculationaredrawnbymeasuringropemethod.Theproblemofdeviationdrillingissolvedbyquicklybreakingthroughthepositionofdeviationdrillinginlessprocessingtimes.Thecombinationofpunchdrillpore-formingandunderwaterblastingcanbeappliedtothehardandinclinedrockstratumunderKarstgeologicalconditions,whileatthesame,itcanreducethedrillstickingaccidents,improvethequalityofpilefoundation,andshortentheconstructionperiod.Keywords:pilefoundation;punchdrillpore-forming;Karst;limestone;deviationdrilling;emulsionexplosive;underwaterblasting1工程概况碧阳二道快速化改造工程位于贵州省毕节市。毕节市地处云贵高原急剧抬升地段,地势崎岖,岩溶地貌如石芽、峰丛、峡谷、溶洞、溶蚀洼地、天生桥与地下河分布普遍。沿线地貌有构造侵蚀、浅切低中山侵蚀、溶蚀地貌,可...