钻孔灌注桩桩底溶洞声呐探测方法及应用研究

发布时间：2018-04-28 19:51

本文选题：桩基工程 + 岩溶　；参考：《岩石力学与工程学报》2016年01期

【摘要】：钻孔灌注桩桩底溶洞的存在给在建工程和周围建筑造成重大影响。由于钻孔灌注桩需要泥浆护壁,现行的物探方法很难在钻孔灌注桩的泥浆内对桩底溶洞进行有效勘查。结合声呐应力波传播特点,提出一种钻孔灌注桩桩底溶洞声呐探测方法,并研发桩底溶洞声呐探测仪(JL-SONAR)和信号分析软件(PBCA)。JL-SONAR探测仪实现了现场声呐信号的发射与采集,PBCA软件完成了探测数据的分析与整理。该技术充分利用钻孔灌注桩的泥浆条件,可以在成孔过程中跟踪探测桩底10 m内溶洞发育情况,具有成本低、速度快、精度高等优点。并通过2个具体工程案例验证了声呐探测技术在实际工程中的应用。研究成果对岩溶地区尤其是液态环境下的溶洞勘查提出了一种新的解决方法。
[Abstract]:The existence of karst cave at the bottom of bored pile has great influence on the construction and surrounding buildings. Due to the need of mud wall protection for bored cast-in-place piles, it is very difficult for the current geophysical prospecting methods to effectively survey the caverns at the bottom of the bored piles in the mud. According to the characteristics of sonar stress wave propagation, a method for detecting sonar in karst cave bottom of bored pile is proposed. JL-SONAR) and the signal analysis software PBCA.JL-SONAR have been developed to realize the sonar signal emission and collection. The PBCA software has completed the analysis and collation of the detection data. This technique can make full use of the mud condition of bored cast-in-place pile and can track and detect the development of caverns within 10 m of the bottom of the pile in the process of drilling, which has the advantages of low cost, high speed and high precision. The application of sonar detection technology in practical engineering is verified by two concrete engineering cases. The research results provide a new method for karst cave exploration, especially in liquid environment.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;武汉长盛工程检测技术开发有限公司;
【基金】：“十二五”国家科技支撑计划项目(2012BAJ11B04) 广东省交通运输厅科技项目(2010 02 021) 国家自然科学基金资助项目(41372272)~~
【分类号】：TU473.1

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