基于跨孔电阻率CT的地铁盾构区间孤石探测方法及物理模型试验研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
跨孔电阻率CT方法在地铁盾构区间孤石探测方面具有一定优势,但仍然存在孤石定位精度低、小尺寸孤石难以识别等工程实际难题。首先,提出了电阻率CT不等式约束反演成像方法和偏导数矩阵的并行解析快速求解方法,从施加先验信息约束和提高反演精度两个方面共同改善了电阻率CT反演的多解性与成像效果。在此基础上,通过大量常规观测模式的成像效果对比试验,提出了一种组合式观测模式,可以综合多种常规观测模式的探测优势并增加采集的数据量,从而提高对异常体的识别能力。针对影响探测效果的两个因素——孔距和电极间距进行了数值模拟试验研究,获得了在组合式观测模式下的有效孔距范围和合理的电极间距参数,并进一步检验了对小粒径孤石的识别效果。在此基础上,提出了地面物探普查与电阻率CT详查相结合的孤石探测方案。最后,开展了物理模型试验研究进行验证,探测结果与实际情况比较一致,具有较好的应用前景。
The cross-hole resistivity tomography method has certain advantages in boulder detection in metro shield zones, but some practical engineering problems, such as low location accuracy and difficult identification of small-size boulders, still exist.First of all, the inequality constrained inversion imaging method and the parallel analytical fast solving method for partial derivative matrix are proposed for reducing the multiple solutions and improving the imaging results in cross-hole resistivity inversion. On this basis, a combined detection mode is raised from numerous results of inversion imaging comparison experiments by routine detection modes. The advantages of various routine detection modes and the collected data amount are integrated in this mode, which is good for improving the recognition ability of abnormal bodies. Then, numerical simulation tests for borehole distance and electrode spacing which affect the detection results are performed. Under the combined detection mode, the effective range of borehole distance and the reasonable electrode spacing parameters are obtained. Further tests on the identification effects of small-size boulders are carried out. On this basis, the boulder detection scheme, which combines the ground geophysical screening and cross-hole resistivity tomography detection, is put forward. Finally, physical model tests are carried out to verify this method. The detection results are almost the same with the actual situation, so the proposed method has good application prospects.
引文
[1]王俊茹,吕继东.地下障碍物雷达定位探测的技术应用[J].地质与勘探,2003,39(3):84-86.(WANG Jun-ru,L(U|")Ji-dong.Technical application of applying ground penetrating radar to the detection of obstruction[J].Geology and Prospecting,2003,39(3):84-86.(in Chinese))
    [2]刘宏岳.地震反射波CDP叠加技术在海域花岗岩孤石探测中的应用[J].工程地球物理学报,2010,7(6):714-718.(LIU Hong-yue.Marine seismic reflection for the detection of the weathering residues in the granite[J].Chinese Journal of Engineering Geophysics,2010,7(6):714-718.(in Chinese))
    [3]李红立,张华,汪传斌.跨孔超高密度电阻率法在花岗岩球状风化体勘探中的试验研究[J].工程勘察,2010(8):88-92.(LI Hong-li,ZHANG Hua,WANG Chuan-bin.Experimental study on the cross-hole ultra-density resistivity method used in the exploration for the spheric lightly-weathered granite[J].Geological Investigating&Surveying,2010(8):88-92.(in Chinese))
    [4]徐佩芬,侍文,凌苏群,等.二维微动剖面探测“孤石”以深圳地铁7号线为例[J].地球物理学报,2012,55(6):2120-2128.(XU Pei-fen,SHI Wen,LING Su-qun,et al.Mapping spherically weathered"boulders"using 2D microtremor profiling method:a case study along subway line 7 in Shenzhen[J].Chinese Journal of Geophysics,2012,55(6):2120-2128.(in Chinese))
    [5]刘斌,李术才,李树忱,等.基于不等式约束的最小二乘法三维电阻率反演及其算法优化[J].地球物理学报,2012,55(1):260-268.(LIU Bin,LI Shu-cai,LI SHU-chen,et al.3D electrical resistivity inversion with least-squares method based on inequality constraint and its computation efficiency optimization[J].Chinese Journal of Geophysics,2012,55(1):260-268.(in Chinese))
    [6]刘斌,李术才,聂利超,等.矿井突水灾变过程电阻率约束反演成像实时监测模拟研究[J].煤炭学报,2012,37(10):1722-1731.(LIU Bin,LI Shu-cai,NIE Li-chao,et al.Real-time monitoring of mine water inrush catastrophic process using electrical resistivity constrained inversion imaging method[J].Journal of China Coal Society,2012,37(10):1722-1731.(in Chinese))
    [7]RODI W L A.Technique for improving the accuracy of finite element solutions for magnetotelluric data[J].Geophysical Journal of the Royal Astronomica Society,1976,44(2):483-506.
    [8]底青云,王妙月.积分法三维电阻率成像[J].地球物理学报,2001,44(6):843-852.(DI Qing-yun,WANG Miao-yue.3-D resistivity tomography by integral method[J].Chinese Journal of Geophysics,2001,44(6):843-852.(in Chinese))
    [9]阮百尧.视电阻率对模型电阻率的偏导数矩阵计算方法[J].地质与勘探,2001,37(6):39-41.(RUAN Bai-yao.The calculation method of partial derivative matrix of apparent resistivity on model resistivity[J].Geology and Prospecting,2001,37(6):39-41.(in Chinese))
    [10]HUANG Kuo-chan,WANG Feng-jian,TSAI Jyun-hwei.Two design patterns for data-parallel computation based on master-slave model[J].Information Processing Letters,1999,70(4):197-204.
    [11]CHEN Li,QIU Jian-lin,CHEN Jian-ping,et al.Improved mater-slave parallel task-allocating algorithm and its implement[C]//Proceeding-2011 International Conference on Network Computing and Information Security.Guilin,2011:209-212.
    [12]刘耀儒,杨强,刘福深,等.基于并行改进遗传算法的拱坝位移反分析[J].清华大学学报(自然科学版),2006,46(9):1542-1550.(LIU Yao-ru,YANG Qiang,LIU Fu-shen,et al.Inverse analyses of arch dam displacements using improved parallel genetic algorithm[J].Journal of TSinghua University(Natural Science),2006,46(9):1542-1550.(in Chinese))
    [13]张志增,李仲奎,程丽娟.基于主从式并行遗传算法的岩土力学参数反分析方法[J].工程力学,2010,27(10):21-26.(ZHANG Zhi-zeng,LI Zhong-kui,CHENG Li-juan.Back analysis on geomechanical parameters based on a master-slave parallel genetic algorithm[J].Engineering Mechanics,2010,27(10):21-26.(in Chinese))
    [14]ZHOU Bing,REENHALGHS A G.Cross-hole resistivity tomography using different electrode configurations[J].Geophysical Prospecting,2000,48(5):887-912.
    [15]GOES B J M,MEEK J A C.An effective electrode configuration for the detection of DNAPLs with electrical resistivity tomography[J].Journal of Environmental and Engineering Geophysics,2004,9(3):127-141.
    [16]DANIELSEN B E,DAHLIN T.Numerical modeling of resolution and sensitivity of ERT in horizontal boreholes[J].Journal of Applied Geophysics,2010,70(3):245-254.
    [17]KONSTANTINOS L,APOSTOLOPOULOS George V.Laboratory study of the cross-hole resistivity tomography:the model stacking(MOST)technique[J].Journal of Applied Geophysics,2012,80(1):67-82.
    [18]魏建新,牟永光,狄帮让.三维地震物理模型的研究[J].石油地球物理勘探,2002,37(6):556-561,660.(WEI Jian-xin,MOU Yong-guang,DI Bang-rang.Study on the 3D seismic physical model[J].Oil Geophysical Prospecting,2002,37(6):556-561,660.(in Chinese))

版权所有:© 2021 中国地质图书馆 中国地质调查局地学文献中心