Comprehensive investigation of water-conducting channels in near-sea limestone mines using microtremor survey, electrical resistivity tomography, and tracer tests: a case study in Beihai City, China

Su, Maoxin; Cheng, Kai‐Wen; Li, Haiyan; Xue, Yiguo; Wang, Peng; Ma, Xiaoyin; Li, Congcong

doi:10.1007/s10064-022-02684-1

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…The high-density resistivity method is actually a resistivity method based on the difference of electrical properties of underground media [54][55][56], which integrates the electric profiling and electric sounding methods [57]. Similar to the DC method, the direct current I is supplied through electrodes A, B to the earth, and the potential difference between the measuring electrodes M, N (ΔU MN ) is recorded, after which the apparent resistivity of the measuring point can be obtained using the formula ρ s = KðΔU MN /IÞ, where K is the coefficient of the device.…”

Section: High-density Resistivity Methodmentioning

confidence: 99%

Review and Challenges in the Geophysical Mapping of Coal Mine Water Structure

Chen

Zhang

et al. 2022

Geofluids

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Generally, the water-bearing structures of coal mines mainly include coal seam, roof, coal seam, floor, and goaf, while the main water-conducting structures include faults, collapsed columns, and collapsed goaf areas. The most commonly used methods for the detection of the above structures include the seismic method, high-density electrical method, controlled source audio-frequency magnetotelluric method, and transient electromagnetic method. Theoretically, the seismic methods have a higher resolution, which can be used to determine the targets’ geometry, but unable to determine whether the target is filled with water, while the electromagnetic methods are capable of this, although with lower resolution. Therefore, it is necessary to adopt the comprehensive geophysical prospecting in the actual field measurement of the coal mine water to guarantee the detection accuracy. Based on this, in the passage, first, we introduced the characteristics of the water-bearing and water-conducting structures and then analyzed the detection results of different methods by examples. Finally, we pointed out that, first, it is essential to develop the mine or airborne methods for the sake of convenience; and second, it is time that we adopt three-dimensional detection technology, multisource and multiresolution detection technology, and electromagnetic big data technology for high accuracy.

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Section: High-density Resistivity Methodmentioning

confidence: 99%

Review and Challenges in the Geophysical Mapping of Coal Mine Water Structure

Chen

Zhang

et al. 2022

Geofluids

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“…An approach based on the Brillouin optical time-domain reflectometry was proposed [15,16]. In addition, tracer tests were used to identify the water-conducting channels [17][18][19]. However, these methods not only consume time and economic cost but are also influenced by the operating circumstances.…”

Section: Introductionmentioning

confidence: 99%

An Improved Back Propagation Neural Network Based on Differential Evolution and Grey Wolf Optimizer and Its Application in the Height Prediction of Water-Conducting Fracture Zone

Wang,

Zhu,

2024

Applied Sciences

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Given that the conventional back propagation neural network (BPNN) easily falls into the local optimal solutions, resulting in poor prediction accuracy, an improved BPNN based on the differential evolution and grey wolf optimizer (DEGWO) is proposed, the so-called DEGWO-BPNN. The prediction of the water-conducting fracture zone (WCFZ) height is significant for mine safety operations. A total of 104 sample data are trained and 25 sample data are tested to identify the optimal prediction model. Five evaluation indexes are selected to assess the prediction performance of the models quantitatively. Finally, the DEGWO-BPNN model is applied to a specific engineering case. The main conclusions are as follows: (1) Mining height, mining depth, coal seam dip, panel width, and ratio of hard rock as the main factors affecting the WCFZ height are selected. The topology structure of the model is defined as ‘5-12-1’; (2) the bias between the predicted value and the actual value of the training samples is smaller with an average error of 2.39. Test samples further validate the prediction precision through evaluation indexes. The values of MAE, RMSE, MAPE, and R2 are 2.3952, 3.4674, 5.3148%, and 0.99077, respectively. The prediction accuracy is 94.6852%; (3) ‘Mining Code’, MLR, BPNN, and GWO-BPNN models are treated as the comparison groups. The comparative analysis shows that the prediction performance of ‘Mining Code’ is the worst, while that of DEGWO-BPNN is the best, and it outperforms other algorithms and statistical approaches; (4) the prediction of WCFZ height in the 11601 panel is in line with the actual value. The prediction error of the DEGWO-BPNN model is lower than that of the comparison models. As such, the DEGWO-BPNN model can be well applied to the prediction of WCFZ height and is suitable for coal mines with different regional geological conditions. It can provide a valuable reference for mine safety operations.

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“…In northeastern Hungary, 39 two-dimensional reflection seismic profiles are used to delineate and evaluate underground geothermal resources [12]. Microtremor survey [13][14][15][16][17] is also one of the hot spots of research in the field of engineering physical prospecting at present. Through a microtremor survey, Xu Peifen et al [18] analyzed the stratigraphic structure and buried fault characteristics, Zhang Wei et al [19] rapidly identified overburden thickness and karst development characteristics, and many other scholars have made great achievements in solving engineering geological problems [20].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Geophysical Measurement in Seismic Safety Evaluation: A Case Study of East Lake High-Tech Development Zone, China

et al. 2022

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Wuhan East Lake High-tech Development Zone is a National Innovation Demonstration Zone where several major projects are under construction. For the seismic safety evaluation of the zone, it is urgent to find out basic data such as stratigraphic structure, geometric characteristics of buried faults, and overburden thickness. In this study, seismic reflection and microtremor surveys are adopted in seismic safety evaluation in urban areas for the first time. Combined with borehole data, the overburden thickness and buried faults in the target area are detected and analyzed. The results are as follows: ① The seismic reflection detection is carried out for the possible hidden locations of the Xiangfan-Guangji Fault and Macheng-Tuanfeng Fault in the target area, and the obtained high-resolution seismic reflection profiles can be used to precisely divide the stratigraphic structure and preliminarily find out the geometric characteristics such as the strike, tendency, and the buried depth of the upper breakpoint of the buried faults. ② A microtremor survey is carried out in key regions of the target area, and the obtained velocity structure imaging can provide a perspective window into the urban underground space structure and accurately determine overburden thickness and the depth of strongly and moderately weathered bedrock. Comprehensive geophysical measurements can better realize the acquisition of basic data such as the stratigraphic structure of complex regions and characteristics of urban buried faults, which provides an important basis for seismic fortification. At the same time, the combined application of geophysical methods avoids the detection of the blind area and provides a guarantee for urban safety and sustainable development. Furthermore, the study has reference value for seismic safety evaluation in similar areas of the world. If comprehensive geophysical measurement can be popularized, its economic and scientific value will be immeasurable.

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Comprehensive investigation of water-conducting channels in near-sea limestone mines using microtremor survey, electrical resistivity tomography, and tracer tests: a case study in Beihai City, China

Cited by 7 publications

References 47 publications

Review and Challenges in the Geophysical Mapping of Coal Mine Water Structure

Review and Challenges in the Geophysical Mapping of Coal Mine Water Structure

An Improved Back Propagation Neural Network Based on Differential Evolution and Grey Wolf Optimizer and Its Application in the Height Prediction of Water-Conducting Fracture Zone

Comprehensive Geophysical Measurement in Seismic Safety Evaluation: A Case Study of East Lake High-Tech Development Zone, China

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