岩溶地区桩基嵌岩缺陷的分析及处理措施

Analysis and treatment of piles of defective tip in karst area

结合多项嵌岩桩检测实例,系统地对沉渣厚度超标、桩端未嵌岩、桩底出现岩溶裂隙、桩底出现软弱夹层等嵌岩缺陷的基桩进行原因分析,并提出相应的补强处理方案,强化桩位超前钻的实施,建议在必要时增加超前钻孔数以充分了解桩底岩土性状,将隐患控制在基桩施工之前,对保证岩溶地区桩基施工质量和安全有着重要意义.

Based on some foundation projects, the defect piles of thick sediment and insufficient bottom bearing capacity and the bearing stratum which appear crack and soft stratum are tested by cross hole sonic logging and core drilling method. These piles are analyzed systematically, and the reinforcement treatments of defective piles are correspondingly discussed. The pre-construction exploration drilling is very important and the number of drilling hole will be increased if it is necessary. These can identify the geology environment to control the hidden danger before pile construction. It is of great significance to ensure the quality and safety of pile foundation construction in karst area.