Electrical Resistivity Tomography study above inaccessible old mine workings for safe erection of high voltage electricity power transmission terrestrial towers: a case study

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-09-13 DOI:10.1007/s10064-024-03893-6

Abhay Kumar Bharti, Amar Prakash, Sandip Oraon, Prerna Jaiswal, Sujit Kumar Mandal

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Abstract

Old and abandoned mine workings become inaccessible with time owing to safety issues thereby demanding insight review of strata overlying such areas. Electrical Resistivity Tomography (ERT) survey was carried out at locations within Kajora area of Eastern Coalfield Limited (ECL) in Raniganj coalfield, India to assess the present strata condition for the proposed high voltage electric transmission layout. Parallel 2D ERT profiles were carried out with 20 m offset covering the study area. Considering the sensitiveness in horizontal direction i.e., identification of vertical structures, the Dipole-Dipole array methodology was implemented. The acquired data sets were filtered and processed using Prosys-II software. L-curve criteria for misfit data was used for proper interpretation of subsurface features. Non-linear least-squares regularized optimization method and 3D ERT volumetric model were performed by combining 2D ERT parallel profiles data sets for better resolution of underground old mine working and accurately map the status of mine workings. High resistivity magnitude ranging between 200 Ωm to 1600 Ωm indicated intact bedrock and solid pillar. Depillared workings area (either dry-filling or air-filled) was identified through anomalous high resistivity magnitude of more than 1600 Ωm. The data generated were also validated with underground working plan and available borehole data. Combination of 2D ERT and 3D ERT techniques against each profile was found to be effective for detection of strata condition for safe installation of terrestrial high voltage electric transmission towers.

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为安全架设高压输电地面塔而在无法进入的旧矿井上方进行电阻率断层扫描研究：案例研究

由于安全问题，随着时间的推移，老旧和废弃的矿井工作面已无法进入，因此需要对这些区域上覆的地层进行深入研究。在印度 Raniganj 煤田的 Eastern Coalfield Limited（ECL）的 Kajora 地区进行了电阻率断层扫描（ERT）勘测，以评估拟议高压输电布局的地层现状。在研究区域内进行了 20 米偏移的平行二维 ERT 剖面测量。考虑到水平方向的敏感性，即垂直结构的识别，采用了偶极-偶极阵列方法。获取的数据集使用 Prosys-II 软件进行过滤和处理。为正确解释地下特征，采用了 L 曲线误拟合数据标准。结合二维 ERT 平行剖面数据集，采用非线性最小二乘正则化优化方法和三维 ERT 体积模型，以更好地解析地下老矿井的工作情况，并准确绘制矿井工作状况图。高电阻率范围在 200 Ωm 至 1600 Ωm 之间，表明基岩和固体矿柱完好无损。通过超过 1600 Ωm 的高电阻率异常值，确定了剥蚀采空区（干式充填或空气充填）。生成的数据还与地下作业计划和现有钻孔数据进行了验证。针对每个剖面结合使用二维 ERT 和三维 ERT 技术，可有效探测地层状况，从而安全安装地面高压输电塔。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.