覆盖型岩溶发育区灌注桩施工案例分析OA

The bedrock surface in the covered karst development area is undulating and the karst development is complicated.During the construction process of cast-in-place piles,problems such as hole collapse,leakage,deviation,drilling jamming,and concrete loss will be encountered,resulting in great difficulty in the construction of cast-in-place piles.The construction technology of cast-in-place piles in covered karst areas has always been a popular research topic.This article takes the construction of foundation piles for a 500 kV transmission line spanning the Yangtze River as an example,and proposes a karst grading treatment method suitable for cast-in-place piles construction based on karst development,including direct rotary drilling method,grouting pre reinforcement method,high pressure jet grouting pre reinforcement method,and pile hole grouting method.The final results have achieved good results and can provide reference for similar projects in the future.