The existence of karst cave at the bottom of bored piles has a great impact on projects under construction and the surrounding buildings. Since bored piles require slurry wall protection, the current geophysical exploration method cannot effectively detect the karst cave at the bottom of the piles in the slurry. Combined with the characteristics of stress wave propagation, the sonar detection method is proposed. JL sonar detector can realize the transmission and acquisition of on-site sonar signals. This method makes full use of the mud conditions of bored cast-in-place piles, and the development of karst caves can be tracked and detected within 10 meters at the pile bottom during the drilling process. It has several advantages, including low cost, high speed, and high precision. This paper verifies the application of sonar detection technology in practical engineering through specific engineering cases. The research results put forward a new solution for cave exploration in karst areas, especially in liquid environment.
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