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| A sonar detection technology for karst cavities under bored piles and its application |
| SHI Zhenming1，2，LIU Liu1，2，PENG Ming1，2，TAO Fengjuan1，2，LIU Chunsheng3 |
| (1.Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Wuhan Conourish Engineering Exploration Technology Development Co.，Ltd.，Wuhan，Hubei 430312，China) |
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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.
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| [1] 石祥锋. 岩溶区桩基荷载下隐伏溶洞顶板稳定性研究[硕士学位论文][D]. 北京：中国科学院研究生院，2005.(SHI Xiangfeng. Study on the roof stability of concealed karst cave under pile foundation loading in karst areas[M. S. Thesis][D]. Beijing：Graduate University of Chinese Academy of Sciences，2005.(in Chinese))
[2] 闫双斌. 桩基荷载下溶洞顶板稳定性研究[硕士学位论文][D]. 长沙：中南大学，2013.(YAN Shuangbin. Research on the stability of cave roof under pile foundation[M. S. Thesis][D]. Changsha：Central South University，2013.(in Chinese))
[3] 周翰斌. 岩溶地质覆盖层及溶洞预处理嵌岩钻孔桩施工技术[C]//第二届全国地下、水下工程技术交流会论文集. 宁波：施工技术杂志社，2011：198–202.(ZHOU Hanbin. Built-in-rock bored pile construction technology of pre-treatment to cover layer and karst cave in karst geology[C]// Proceedings of The Second National Conference of Underground，Underwater Engineering Technology. Ningbo：Construction Technology Magazine，2011：198–202.(in Chinese))
[4] 胡朝彬，邓世坤，王宝勋，等. 探地雷达用于人工挖孔桩桩底岩溶探测的应用研究[J]. 地质灾害与环境保护，2009，(2)：74–78.(HU Chaobin，DENG Shikun，WANG Baoxun，et al. Application study of the GPR method in the detection of karsts beneath artificial excavated hole pile[J]. Journal of Geological Hazards and Environment Preservation，2009，(2)：74–78.(in Chinese))
[5] 崔志盛，夏才初，赵 凯. 大直径嵌岩桩桩底溶洞探测方法探讨和应用[J]. 西部交通科技，2011，(7)：46–50.(CUI Zhisheng，XIA Caichu，ZHAO Kai. Discussion on the method and application of detection method for large diameter rock-socketed pile bottom cave[J]. Western China Communication Science and Technology，2011，(7)：46–50.(in Chinese))
[6] 葛祖焕，胡纯清，向慧敏，等. 桩端灰岩溶洞探测[J]. 物探与化探，2004，28(1)：85–87.(GE Zuhuan，HU Chunqing，XIANG Huimin，et al. The exploration of limestone karst cave at the end of pile[J]. Geophysical and Geochemical Exploration，2004，28(1)：85–87.(in Chinese))
[7] 练光伟. 钻孔灌注桩桩底溶洞探测技术研究[硕士学位论文][D]. 重庆：重庆交通大学，2012.(LIAN Guangwei. Research on the detection technology of cave on the bottom of the cast-in-place pile[M. S. Thesis][D]. Chongqing：Chongqing Jiaotong University，2012.(in Chinese))
[8] 张 章，孙 涛，刘继东，等. 探地雷达频域分析法在桩底岩溶探测中的应用[J]. 土工基础，2014，(2)：163–166.(ZHANG Zhang，SUN Tao，LIU Jidong，et al. Frequency domain analysis of ground penetrating rader in detecting the karst rock cavity under pile tips[J]. Soil Engineering and Foundation，2014，(2)：163–166.(in Chinese))
[9] 刘文峰，张振勇. 探地雷达在岩溶地基探测中的应用[J]. 物探与化探，2014(3)：624–628.(LIU Wenfeng，ZHANG Zhenlei. The application of ground-penetrating radar to the karst foundation investigation[J]. Geophysical and Geochemical Exploration，2014(3)：624–628.(in Chinese))
[10] 陈剑华. 岩溶强发育地区深桩基础施工关键技术研究[硕士学位论文][D]. 长沙：中南大学，2014.(CHEN Jianhua. Research on the construction technology of the deep pile foundation in the strong karst development area[M. S. Thesis][D]. Changsha：Central South University，2014.(in Chinese))
[11] 赵 杰. 大直径桩桩位岩溶管波探测技术研究[硕士学位论文][D]. 青岛：中国海洋大学，2012.(ZHAO Jie. Research of tube wave prospecting karst development under large diameter pile[M. S. Thesis][D]. Qingdao：Ocean University of China，2012.(in Chinese))
[12] 中华人民共和国国家标准编写组. GB50021—2009岩土工程勘察规范[S]. 北京：中国建筑工业出版社，2009：52–55.(The National Standards Compilation Group of People?s Republic of China. GB50021— 2009 Code for Investigation of Geotechnical Engineering[S]. Beijing：China Architecture and Building Press，2009：52–55.(in Chinese))
[13] 王炳和，李宏昌. 声纳技术的应用及其最新进展[J]. 物理，2001，30(8)：491–495.(WANG Binghe，LI Hongchang. Application and development of sonar technology[J]. Physics，2001，30(8)：491–495.(in Chinese))
[14] 钟世航，孙宏志，王 荣，等. 陆地声呐法在探查单个溶洞方面的优势[J]. 物探与化探，2008，31(B10)：111–115.(ZHONG Shihang，SUN Hongzhi，WANG Rong，et al. The superiority of landsonar in karst cave survey[J]. Geophysical and Geochemical Exploration，2008，31(B10)：111–115.(in Chinese))
[15] 田 坦. 声呐技术[M]. 2版. 哈尔滨：哈尔滨工程大学出版社，2009：1–2.(TIAN Tan. Sonar technology[M]. 2nd ed. Harbin：Harbin Engineering University Press，2009：1–2.(in Chinese))
[16] 特尔福德. 应用地球物理[M]. 2版. 北京：科学出版社，2011. (TELFORD W M. Applied geophysics[M]. 2nd ed. Beijing：Science Press，2011.(in Chinese)) |
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2016, Vol. 35 
