钻孔灌注桩桩底溶洞声呐探测方法及应用研究

doi:10.13722/j.cnki.jrme.2015.0125

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Abstract Those karst cavities beneath the bottom of cast piles in bore hole have significant impact on the project itself and the surrounding buildings. Due to the necessary mud protection in bored pile construction，many geophysical methods at current stage are not applicable for the karst cavity detection. A sonar technology for the detection of karst cavities located beneath the bored pile was proposed utilizing the features of sonar stress wave propagation. A sonar detector(JL-SONAR) and a signal analysis software PBCA were developed. JL-SONAR detector was responsible for the transmission and collection of sonar signals，and PBCA software was designed to analyze and sort the detection data. The technology makes full use of drilling mud，and enables the detection of the karst cavities within the range of 10 meters below the pile bottom during drilling. The technology was applied in two projects successfully and has the advantages of low cost，high speed and high precision.

Key words： foundation engineering karst karst cavity detection sonar reflected wave method bored pile

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0125 OR http://www.rockmech.org/EN/Y2016/V35/I1/177

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