三维高密度电法在古城墙缺陷探测中的应用  

Application of 3D High Density Resistivity Method in Ming Dynasty Wall Defect Detection

作　　者：孙海福 朱占升 王兵[3] Sun Haifu;Zhu Zhansheng;Wang Bing(Hengda Century(Beijing)Geophysics Technology Co.,Ltd.,Beijing 100020,China;Beijing Huan an Engineering Inspection and Test Co.,Ltd.,Beijing 100082,China;School of Architecture and Urban Planning,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]恒达新创(北京)地球物理技术有限公司,北京100020 [2]北京环安工程检测有限责任公司,北京100082 [3]北京建筑大学建筑与城规学院历史建筑保护系,北京100044

出　　处：《铁道勘察》2020年第2期66-69,共4页Railway Investigation and Surveying

摘　　要：为了探测年久失修的明代古城墙的内部缺陷结构及位置,在墙顶部布设48个不锈钢电极(电极间距取1.5 m,呈L形排列),将不锈钢电极串联连接到SYSCAL PRO主机上,并使用高精度RTK记录48个不锈钢电极的三维坐标。使用偶极-偶极和施伦贝格两种高密度采集装置,将两种装置采集的高密度数据输入ERTLAB64三维电阻率层析正反演软件中,得到沿着测线的电阻率反演剖面和L形测线下的三维电阻率数据体。研究表明,古城墙顶部东部区域2~6 m深度区域内和古城墙西南角浅层区域存在高阻,推测为裂缝或空洞等风险区域。48 stainless steel electrode poles which are connected into SYSCAL PRO host unit,are inserted onto the top of the old city wall(the spacing is 1.5 meter and the layout is like L shape)in order to detect the internal defect structures of old city wall of Ming dynasty without any repair for long years,while the RTK with high accuracy is used to locate the 3D coordinates of 48 electrode poles.The Dipole-Dipole and Schlumberger collection devices are used one by one and two types of high density data are integrated together into the ERTLAB643D resistivity tomography forward and inversion software so as to achieve the resistivity inversion section along the measurement line and the 3D data volume of resistivity under the L shape surface.It is demonstrated based on the research that the high resistivity exists at the eastern area in 2~6 meters depth and the southwestern shallow layer along the L shape line with the guess that there may be risk region with fracture or void etc in these two areas.

关 键 词：古城墙 缺陷探测 三维高密度电法 电阻率反演 

分 类 号：P642[天文地球—工程地质学]