声呐探测法在桩底岩溶探测中的应用分析

Application analysis of sonar detection method in pile bottom karst detection

昆明至倘甸高速公路多段穿越岩溶发育区,在建设阶段,岩溶是桩基工程的主要工程地质问题.岩溶区桩基施工中采用声呐探测法对桩底岩体完整程度及岩溶进行探测,声呐探测法将声呐技术应用于地质勘探中,利用桩孔中的泥浆作为声波传播和耦合的介质,探测桩底的溶洞发育情况,能有效地判断桩底以下10 m范围内岩溶发育情况,分析判断溶洞顶板的稳定性,并针对性的对桩长进行调整,可确保桩基的稳定.通过施工验证表明,该探测方法的准确性较高,具有检测周期较短、成本低的优点,可在岩溶发育地区桩基施工中发挥重要的作用,具有推广应用的价值.

Many sections of the Kunming-Tangdian expressway under construction pass through the karst development area,and karst is the main engineering geological problem of the pile foundation engineering.In the pile foundation construction in the karst area,the sonar detection method is used to detect the integrity of the rock mass at the bottom of the pile and the karst.The sonar detection method applies sonar technology to geological exploration,and uses the mud in the pile hole as a medium for acoustic wave propagation and coupling to detect the development of karst caves at the bottom of the pile,which can effectively judge the karst development within 10m below the pile bottom,analyze the stability of the karst cave roof.The length of the pile is adjusted in a targeted manner to ensure the stability of the pile foundation.The construction verification shows that the detection method has high accuracy,and has the advantages of short detection period and low cost.It can play an important role in the construction of pile foundations in karst developmentareas,and has the value of popularization and application.