综合物探方法在城市地下桩基地籍调查中的应用研究
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摘要
应用高密度电法与地质雷达开展综合物探方法研究,探测混凝土灌注桩的横向空间分布与桩顶垂直埋深等城市地下桩基地籍情况。通过模型实验比较了地下多个高阻异常体分布条件下两种物探方法各自在横向和纵向分辨率上的优势。研究了高密度电法中不同排列方式的横向分辨率,选用了横向分辨率更优的偶极排列;针对高密度电法在纵向分辨率上不够的问题,使用地质雷达圈定桩顶埋深。结果显示,应用高密度电法选取有效的排列方法在地下障碍物探测中可有效提高横向定位精度,同时采用地质雷达方法提高了纵向分辨率,两者综合最终得到一个较为精确的解释结果。
High density resistivity and ground penetrating radar(GPR) method are applied to exploration of horizontal position and depth of a number of underground concrete pile foundations at an electric field in Shanghai,Based on Synthetic modeling the horizontal and vertical resolution of different method is studied when using the model of several underground high-resistivity conductors.Different arrays is also studied in order to choose the best horizontal resolution and dipole array is finally chosen because of its higher resolution.Concerning the low-resolution of high density-resistivity method,GPR method is introduced to position the top of pile foundation.The final result reveals that the horizontal resolution of high density resistivity method may become higher when using effective array,and the higher-vertical resolution with the GPR method may lead to a more precise interpretation result.
High density resistivity and ground penetrating radar(GPR) method are applied to exploration of horizontal position and depth of a number of underground concrete pile foundations at an electric field in Shanghai,Based on Synthetic modeling the horizontal and vertical resolution of different method is studied when using the model of several underground high-resistivity conductors.Different arrays is also studied in order to choose the best horizontal resolution and dipole array is finally chosen because of its higher resolution.Concerning the low-resolution of high density-resistivity method,GPR method is introduced to position the top of pile foundation.The final result reveals that the horizontal resolution of high density resistivity method may become higher when using effective array,and the higher-vertical resolution with the GPR method may lead to a more precise interpretation result.
引文
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[2]孙宝,谷延凤.探地雷达在碎石桩检测中的应用[J].河北农业大学学报,2010,33(5):128-130.Sun B,Gu Y F.The application of ground penetrating radar inthe inspection of gravel pile composite foundation[J].Journal ofAgricultural University of Hebei,2010,33(5):128-130.
[3]程藐,傅焰林.高密度电法在查明潜伏断裂中的应用[J].工程地球物理学报,2011,8(4):417-420.Cheng M,Fu Y L.Application of high density resistivity methodto hidden fault investigation[J].Chinese Journal of EngineeringGeophysics,2011,8(4):417-420.
[4]邓娜,江长森.高密度电法在工程勘察中的应用实例[J].物探化探计算技术,2009,31(6):577-581.Deng N,Jiang C S.The case studies of high density resistivitymethod in engineering exploration[J].Computing Techniques forGeophysical and Geochemical Exploration,2009,31(6):577-581.
[5]朱自强,戴亦军.高密度电阻率法在高速公路岩溶探测中的应用[J].工程地球物理学报,2004,1(4):309-312.Zhu Z Q,Dai Y J.Application of high density resistivity method tothe detecting of Karst collapse on the freeway[J].Chinese Journalof Engineering Geophysics,2004,1(4):309-312.
[6]姬继法,袁洪克,袁云红.探地雷达在桩基工程检测中的应用[J].物探与化探,2001,25(2):148-151.Ji J F,Yuan H K,Yuan Y H.The application of ground penetratingradar to the inspection of pile foundation engineering[J].Geophysic&Geochemical Exploration,2001,25(2):148-151.
[7]谢朝晖.地下同目标体的探地雷达图像特征研究[J].工程地球物理学报,2005,2(1):8-11.Xie Z H.Analysis of the ground penetrating radar image of the different underground objects[J].Chinese Journal of Engineering Geophysics,2005,2(1):8-11.
[8]陈一平,李颜,陈桂芳.地质雷达在地下埋藏物检测中的应用研究[J].物探化探计算技术,2009,31(4):319-322.Chen Y P,Li Y,Chen G F.The application of geological radar indetection of burial bodies[J].Computing Techniques for Geophysical and Geochemical Exploration,2009,31(4):319-322.
[9]罗亨文,周平.坝陵河大桥东索塔桩基工程岩溶综合探测技术[J].路基工程,2006(4):118-120.Luo H W,Zhou P.Integrated Karst-exploring techniques for pile foundation of east cable support tower of Baling river bridge[J].Subgrade Engineering,2006(4):118-120.
[10]赵永辉,吴健生,万明浩.探地雷达与管线探测仪的联合反演解释[J].工程地球物理学报,2005,2(1):1-7.Zhao Y H,Wu J S,Wan M H.Joint inversion interpretation of detecting data using ground penetrating radar and pipeline locator[J].Chinese Journal of Engineering Geophysics,2005,2(1):1-7.
[11]向阳,李玉冰,易利,等.排列方式及电极距对高密度电法异常响应的影响分析[J].工程地球物理学报,2011,8(4):426-432.Xiang Y,Li Y B,Yi L,et al.The effect of array and electrode spacing on abnormal response of high density resistivity method[J].Chinese Journal of Engineering Geophysics,2011,8(4):426-432.
[12]李天成,牛滨华,孙春岩,等.2D电阻率正反演成像在水平和垂直模型上的异常响应研究[J].地球物理学进展,2007,22(3):940-946.Li T C,Niu B H,Sun C Y,et al.2D resistivity tomography for anomalous response study on horizontal layered and vertical model[J].Progress in Geophysics,2007,22(3):940-946.
[13]杨建刚.工程物探方法在上海城市建设与管理中的应用[J].上海地质,2006,27(4):14-18.Yang J G.The application of engineering geophysical technology in urban construction of Shanghai[J].Shanghai Geology,2006,27(4):14-18.
[14]饶险峰,王治华,孙正浩.地球物理技术在非开挖工程中的应用评价[J].上海地质,2007,28(2):52-55.Rao X F,Wang Z H,Sun Z H.The evaluation of geophysical technology application in trenchless engineering[J].Shanghai Geology,2007,28(2):52-55.
[15]王治华.地下空间地籍调查三维地震勘探技术应用研究[J].上海国土资源,2011,32(2):61-66.Wang Z H.Application of shallow3D seismic exploration technology in the cadastral survey of underground space in Shanghai[J].Shanghai Land&Resources,2011,32(2):61-66.
[16]孙秀容,夏学礼,赵东,等.双源面波数据采集与处理系统及其应用效果[J].上海国土资源,2011,32(3):87-92.Sun X R,Xia X L,Zhao D,et al.Dual-source surface wave data acquisition and processing system and its application effect[J].Shanghai Land&Resources,2011,32(3):87-92.
[17]刘伍,曾来,司永峰,等.地下障碍物探测井中地震散射波成像数值模拟[J].上海国土资源,2012,33(3):66-70.Liu W,Zeng L,Si Y F,et al.Numerical simulation of borehole seismic scattered wave imaging for the detection of underground obstacles[J].Shanghai Land&Resources,2012,33(3):66-70.
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