探地雷达用于人工挖孔桩桩底岩溶探测的应用研究
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摘要
在岩溶地区进行楼房建设、工厂修建、修路架桥时,其桩基的设计很多采用人工挖孔嵌岩灌注桩(人工挖孔桩)。通过对人工挖孔桩桩底目前几种探测手段的对比分析,运用探地雷达方法对桩底进行岩溶探测有其独特的优势。文章首先介绍了探地雷达桩底探测的具体方法,并根据介质介电常数的变化分析了探地雷达天线在桩底的辐射特征;其次,对桩底的两种地质模型进行了正演模拟;最后对岩溶地区人工挖孔桩底实测探地雷达剖面进行了分析解释。
In the construction of high storied buildings,factories,roads and bridges in karsts regions,artificial excavated hole pile basements are often designed and adopted.Having analyzed and compared several methods of detection of karsts beneath the artificial excavated hole used at present,we found that GPR method possesses unique advantages.In this paper,at first,the GPR detection method of karsts beneath artificial excavated hole pile was introduced and discussed in detail,and based on the change of media permittivity,the antenna radiation characteristics beneath artificial excavated hole pile was analyzed.Secondly,we constructed two kinds of horizontal layered geological models and calculated their synthetic GPR records.Finally,some GPR records collected in the karsts detection beneath the artificial excavated holes were analyzed and interpreted.
In the construction of high storied buildings,factories,roads and bridges in karsts regions,artificial excavated hole pile basements are often designed and adopted.Having analyzed and compared several methods of detection of karsts beneath the artificial excavated hole used at present,we found that GPR method possesses unique advantages.In this paper,at first,the GPR detection method of karsts beneath artificial excavated hole pile was introduced and discussed in detail,and based on the change of media permittivity,the antenna radiation characteristics beneath artificial excavated hole pile was analyzed.Secondly,we constructed two kinds of horizontal layered geological models and calculated their synthetic GPR records.Finally,some GPR records collected in the karsts detection beneath the artificial excavated holes were analyzed and interpreted.
引文
[1]刘金林.岩溶地区人工挖孔桩的应用探析[J].中国水运,2007,5(9):46-47.
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[7]邓世坤.探地雷达野外工作参数选择的基本原则[J].工程地球物理学报,2005,2(5):323-329.
[8]Yuren Jiao,George A.McMechan,Elena Pettinelli.In situ 2-D and 3-D measurements of radiation patterns of half-wave di-pole GPR antennas[J].Journal of Applied Geophysics,2000,43:69-89.
[9]邓世坤.地质雷达图像的正演合成[J].地球科学———中国地质大学学报,1993,18(3):285-393.
[10]黄南晖.地质雷达探测的波场分析[J].地球科学———中国地质大学学报,1993,18(3):294-302.
[2]张顺东,方成,黄圣棕.地质雷达在桩底岩溶探测中的应用[J].地震地磁观测与研究,2005,26(4),103-106.
[3]刘勇,陈征宙.桩底岩溶的地质雷达探测[J].勘察科学技术,2003,(4):54-60.
[4]Annan AP.Ground-penetrating radar principles,procedures&applications[M].Canada:Sensors and Software Inc,2003.
[5]Davis JL,Annan AP.Ground-penetrating radar for high-reso-lution mapping of soil and rock stratigraphy[J].GeophysicalProspecting,1986,37:531-551.
[6]邓世坤.湖北水泥装备制造有限公司扩建工程挖孔桩地质雷达探测报告[R].2008.
[7]邓世坤.探地雷达野外工作参数选择的基本原则[J].工程地球物理学报,2005,2(5):323-329.
[8]Yuren Jiao,George A.McMechan,Elena Pettinelli.In situ 2-D and 3-D measurements of radiation patterns of half-wave di-pole GPR antennas[J].Journal of Applied Geophysics,2000,43:69-89.
[9]邓世坤.地质雷达图像的正演合成[J].地球科学———中国地质大学学报,1993,18(3):285-393.
[10]黄南晖.地质雷达探测的波场分析[J].地球科学———中国地质大学学报,1993,18(3):294-302.
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