Research on Detection and Safety Analysis of Unfavorable Geological Bodies Based on OCTEM-PHA

Abstract

The caving method and mining disturbance may cause geological issues. The advance prediction of unfavorable geological bodies should be conducted to ensure product safety in the underground mine. In this study, we proposed the OCTEM-PHA analysis process and analyzed the Tongkeng Mine in Guangxi. Further, we conducted opposing-coil transient electromagnetic method (OCTEM) detection on four detection lines in T5-1 stope at mine level 386 by using portable geological remote sensing equipment and created inversion maps. Plot profiles and coupling were analyzed with inversion maps to explore the five types of risk factors presented in the mine. The preliminary hazard analysis (PHA) method was used for five types of risk factors to predict the accident consequence and develop safety countermeasures. The results indicate the following: (1) the OCTEM-PHA safety analysis process for unfavorable geological bodies is realistic and feasible. (2) OCTEM shows an excellent response to both high- and low-resistance anomalies in practical engineering applications. The coupling analysis of profiles and inversion maps helps visually analyze the area of apparent resistivity anomalies. (3) The studied mine did not show overhanging formed by the overlying rock layer and large loose void areas. However, the crumbling mining area should be further optimized for balanced mining, the treatment of groundwater and surface water should be improved, and the comparative analysis with the follow-up detection results should be increased.

A Case Study of Accident Analysis and Prevention for Coal Mining Transportation System Based on FTA-BN-PHA in the Context of Smart Mining Process

“…To determine key influencing factors and identify accident causal event chains of autonomous surface ships, Zhang et al [33] proposed a PHA-based causal logic method to provide references for maritime autonomous surface ship design and safety assessment processes. Combined with inversion temperature charts, Zhu et al [34] proposed an OCTEM-PHA analysis model to analyze and predict five risk factors present in Guangxi mine and propose corresponding safety measures. To identify hazardous scenarios, Nicolau et al [35] developed a PHA-based quantitative analysis method for the radioactive and chemical risks in uranium isotope enrichment facilities and defining the characteristics of each hazard and their causes and consequences.…”