Back analysis of high density resistivity method in the water-bearing karst cave
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摘要: 在高密度电法勘探中，不同性质的溶洞其反演电阻率特征有差异，溶洞为空洞时反演电阻率表现为高阻，充满水时表现则为低阻，而充水溶洞的电阻率反演特征很难判断。文章通过构建不同充水程度的溶洞模型进行正演模拟，利用最小二乘法对模型的地电断面进行反演，对比不同反演成像模型的地电响应特征。结果表明，充水溶洞的电阻率随溶洞充水量的增加而减小，低阻的范围随着水量的增加而不断扩大，其可分辨性强。野外探查资料进一步验证了模拟结果，所获得的认识对地下溶洞的电法探测分析具有一定的指导意义。Abstract: In high-density electrical prospecting, karst caves may show different electricity resistivity (ER) characteristics due to the nature of cave fillings. When a cave is empty, its ER value appears extremely high, when being completely filled with water this value could be very low. However, for an unsaturated karst cave, the resistivity range is difficult to judge via ER data interpretation. By constructing different models with various cave moisture contents, forward modeling using the method of least square at geoelectric sections were conducted, compared with the different geoelectric response characteristics of their inversion imaging model. The results showed that the resistivity of water-bearing karst cave decreases with increasing water content. On the geoelectircal section the range of low resistance expanded with the amount of water increased, which was strongly distinguishable. Exploration data derived from the field work further has verified the validity of the simulated results shedding light on the significance of the model application and a better understanding of electrical analysis method for underground cavern detection.
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Key words:
- karst cave /
- high density resistivity method /
- numerical simulation /
- scene detection
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[1] 胡树林,陈烜,帅恩华.超高密度电阻率法在岩溶及破碎带探测中的应用［J］.物探与化探, 2011,35(6):821-824. [2] 谭磊, 张平松, 吴荣新. 隐伏洞体并行电法探查试验研究［J］. 昆明理工大学学报:自然科学版, 2015,(2):38-43. [3] 孟令星. 三维电阻率方法对含水溶洞的反演模拟研究［J］. 山西建筑, 2014,(28):58-59. [4] 祝卫东, 钱勇峰, 李建华. 高密度电阻率法在采空区及岩溶探测中的应用研究［J］. 工程勘察, 2006,(4):69-72. [5] 郑智杰, 甘伏平, 曾洁. 不同深度岩溶管道的高密度电阻率法反演特征［J］. 中国岩溶, 2015,34(3):292-297. [6] 郭清石. 高密度电法对溶洞勘探的数值模拟研究［D］. 西安：西南交通大学, 2013. [7] 吴荣新, 刘盛东,张平松. 双巷并行电法探测煤层工作面底板富水区［J］. 煤炭学报,2010,35(3): 454-457. [8] 王喜迁, 孙明国, 张皓,等. 高密度电法在岩溶探测中的应用［J］. 煤田地质与勘探, 2011,39(5):72-75. [9] 吴荣新, 张卫, 张平松. 并行电法监测工作面“垮落带”岩层动态变化［J］. 煤炭学报, 2012,37(4):571-577. [10] 吴荣新, 刘盛东, 张平松,等. 地面钻孔并行三维电法探测煤矿灰岩导水通道［J］. 岩石力学与工程学报, 2010, 29(A2):3585-3589. [11] 王海宁, 乔光建. 涞源岩溶地下水系统泉水量变化特征分析［J］. 南水北调与水利科技, 2011,9(6):54-57. [12] 王永亮,李昊洁,张昀保,等.高密度电法在子牙新河堤防隐患探测中的应用［J］.南水北调与水利科技,2010,8(4):145-147. [13] 李树琼, 蒋丛林, 马志斌. 高密度电法在岩溶地区勘查中的应用［J］. 矿物学报, 2013,33(4):540-544. [14] Loke M H，Dahlin T. A comparison of the Gauss-Newton and Quasi-Newton methods in resistivity imaging inversion［J］. Journal of Applied Geophysics,2002,49(3):149-162. [15] Loke M H， Barker R D. Practical techniques for 3D resistivity surveys and data inversion［J］. Geophysical Prospecting,1996,44(3):499-523. [16] 金聪, 刘江平. 二维高密度电阻率法数值模拟与应用［J］.地质与勘探,2014,50(5):984-990. [17] 谭磊,胡雄武,张平松,等.坝体浸润特征的并行电法连续监测技术［J］. 南水北调与水利科技, 2015，13(5):926-930. [18] 刘伟, 甘伏平, 赵伟,等. 高密度电法与微动技术组合在岩溶塌陷分区中的应用分析：以广西来宾吉利塌陷为例［J］. 中国岩溶, 2014，33(1):118-122. [19] 张欣, 赵明阶, 汪魁,等. 电法三维成像技术在隧道岩溶探测中的应用［J］. 中国岩溶, 2016，35(3):291-298. -
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