QUALITY TEST AND DEFECT TREATMENT OF PERCUSSION DRILLING BORED PILE IN KARST AREAS

Combining with the case of percussion drilling bored piles for tall buildings in Guangxi karst area,it was analyzed the factors influencing the quality of such piles in the karst area and detection methods and comprehensively compared the advantages and disadvantages of low strain reflection wave method,ultrasonic transmission method and the drilling pumping core.According to the different situation of percussion drilling bored piles,it was put forward how to comprehensively use the different combinations of low strain reflected wave method,ultrasonic transmission method and borehole core,it was carried out testing and analysis of the quality of punching perfusion pile located in karst zone.In addition,According to the defective piles,it was put forward effective treatment plan of high pressure grouting method,and the treated piles were detected using ultrasonic detector test again,the effect was ideal.