基于非结构有限元的电阻率超前探测中旁侧异常影响特征研究

doi:10.11720/wtyht.2023.1437

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Abstract

To further explore the influence patterns of side anomalies in resistivity-based advance detection for roadways and to improve the detection accuracy,this study conducted three-dimensional forward modeling using an adaptive unstructured finite element method based on dual weighted posteriori error estimation.First,this study verified the applicability and accuracy of this method in the simulation of advanced detection using an infinite vertical plate model.Then,it established a model without considering side anomalies to simulate the advance detection response in roadways.Then,it conducted numerical simulations of high- and low-resistivity side anomalies' directions,the distances from side anomalies to roadways and mining faces,roadway sizes,power supply and reception ways,and the influence of side anomalies on advance detection in multi-layer media.Finally,this study analyzed the morphological characteristics of apparent resistivity anomaly curves.The results are as follows:(1)The actual positions of anomalies in front of roadways can be inferred from the extreme values of anomaly curves;(2)The responses of high- and low-resistivity side anomalies generally do not mask the response characteristics of anomalies in front of roadways.However,they can distort the anomaly curves in the corresponding range by making them convex or concave,with the distortion positions consistent with the actual positions of anomalies;(3)The presence of roadway cavities enhances the responses of anomalies on roadway floors.Although different roadway sizes impose different effects on anomalies on roadway rooves,they do not affect the responses of anomalies in front of roadways in general;(4)In multi-layer strata,anomaly response curves can still reflect the actual positions of side anomalies.Whether the response characteristics of anomalies in front of roadways are masked depends on the resistivity of each layer;(5)The identification of interference anomalies requires further research in combination with actual conditions.

Key words： resistivity-based advance detection side anomaly roadway adaptive finite element anomaly amplitude

Received: 15 September 2022 Published: 11 October 2023

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	Hai-Wen CHEN
	Yi-Xin YE
	Shuo-Jian YANG
	Jin-Sheng QIN

Cite this article:

Hai-Wen CHEN,Yi-Xin YE,Shuo-Jian YANG, et al. A study on the influence of side anomalies in resistivity-based advance detection based on an unstructured finite element method[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 975-985.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1437 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/975

Schematic diagram of the advance detection principle

Schematic diagram of the underground infinite plate body model profile

Local unstructured mesh profiles

Comparison of the numerical and analytical solutions of the apparent resistivity

Grid section of the local tunnel

Side anomalous body model with tunnel

Abnormal curves of distances d change

Abnormal curves of anomalous bodies ρ change

Fitting curves of the relationship between extreme position and actual position

Abnormal curves of side anomalous bodies in different directions

Abnormal response curves of upper and lower sides without tunnel

Side abnormal curves at different distances from the tunnel

Side abnormal curves at different distances from the tunnel face

Floor abnormal curves of different tunnel sizes

Roof abnormal curves of different tunnel sizes

Schematic diagram of power supply and reception in different ways

Side abnormal curves of power supply and reception in different ways

Schematic diagram of three-layered strata

Resistivity parameters of the three-layered layered modelΩ·m

Abnormal curves of different media resistivity

Abnormal curves of different h₂ thicknesses

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