Fault tree analysis and prevention strategies for gas explosion in underground coal mines of Pakistan

Shahani, Niaz Muhammad; Sajid, Muhammad Jawad; Zheng, Xigui; Jiskani, Izhar Mithal; Brohi, Manzoor Ali; Ali, Muhammad; Ullah, Barkat; Qureshi, Abdullah Rasheed

doi:10.33271/mining13.04.121

Cited by 13 publications

(4 citation statements)

References 13 publications

(13 reference statements)

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“…Coal and gas outburst refers to the phenomenon in which there is a sudden outburst of coal and gas from inside the coal wall to the mining face in a short period of time, causing immeasurable casualties and serious losses. The causes of coal and gas outburst are mainly the result of ground pressure, tectonic stress and mine pressure, gas content and gas pressure, and the physical and mechanical properties of rock and coal [15]. Many researchers have utilized new methods to study the mining methods targeting coal and gas outburst in coal seams.…”

Section: Methodsmentioning

confidence: 99%

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

et al. 2022

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Coal will continue to play an important role in China’s economic development and social development in the coming decades. However, due to the complex distribution conditions of coal resources, the mining of coal resources is subject to various restrictions. Coal and gas outburst is an important issue in coal mining, and the threat to the mining of coal resources caused by high gas outburst activity has been receiving more attention. In order to solve the problems related to safe and efficient mining under coal seams with gas outburst, such as mining difficulties, large amounts of work, resource waste, no guaranteed gas treatment time, and low economic efficiency, it is necessary to innovate mining technology and methods for managing gas outburst in coal seams to improve the efficiency of coal mines and to solve the above problems. This study proposes a green mining technical method system known as the “L-H method”, which is applicable to the safe and efficient mining of coal seams with gas outburst based on combined theoretical analysis and numerical simulation. The following research results are achieved: (1) The “L-H method” is proposed, and a mining area model of coal seams with gas outburst is established. The specific details of the method and the implementation process are introduced. (2) Examples of H coal mine applications are presented, and the effects of the implementation of the “L-H method” are analyzed and summarized through mine pressure observations from roadways, and it is concluded that the implementation of top-cutting and pressure-relief technology has a good control effect on the roadway-surrounding rock and that gas extraction reaches the national standard of less than 8 m3/t for protrusion prevention; this ensures safety and also achieves efficient mining. This study will provide a good reference for the implementation of green mining methods to similar coal and gas outburst mines.

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Section: Methodsmentioning

confidence: 99%

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

et al. 2022

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“…The Geological Survey of Pakistan (GSP) and the United States Agency for International Development (USAID) have surveyed the area. Thar lignite, Pakistan has been declared the 7 th largest coal reserves in the world [42][43][44][45].…”

Section: Case Studymentioning

confidence: 99%

Numerical modeling of longwall top coal caving method at thar coalfield

et al. 2020

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Thar Coalfield in Pakistan is the largest reserve of lignite coal in the country, which is outlined by thick coal seams. The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in LTCC that must be adequately explained and examined. Moreover, in order to achieve the ideal coal production, a comprehensive modeling of deformation and induced stress is mandatory. In this study, a 12 m thick coal seam with cutting to caving height ratios like 1:2 and 1:3 has been modelled, and the mechanism of longwall top coal caving demonstrated and front abutment vertical stress distribution in front of face line values were computed with the help of UDEC at Block-IX, Thar Coalfield. The results reveal that a thick layer of top coal can be progressively caved behind the face at the ratio 1:3 instead of 1:2 (which explained the incompetent caving progress of top coal). Similarly, the maximum vertical abutment stress of 20 MPa was observed at 6m in front of the face when cutting to caving height ratio was 1:2 and at 3m in front of face with 1:3 (which is comparatively capable for the face advancement), respectively. Therefore, this numerical modeling study proposes the reasonable height of top coal caving at cutting to caving height ratio 1:3 for the efficient production of thick coal seams at Thar Coalfield.

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“…The use of an appropriate ventilation system should ensure not only the continuity of extraction and obtaining of certain economic results but also safe operation (and safety of the employees involved) [3]. The effectiveness of ventilation system is conditioned by the equipment used [4].…”

Section: Introductionmentioning

confidence: 99%

Selection of Employees for Performing Work Activities in Currently Used Ventilation Systems in Hard Coal Mining

et al. 2022

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The way in which rescue actions are carried out in a hard coal mine is conditioned by a number of factors, including the type, scale, and location of the hazard; location of employees at the danger and level of their endangerment; and the ventilation system used in the impacted area. In this article, the importance and necessity to take into account a human factor, specifically the propensity for risky behavior, alongside the selection of rescuers for rescue action is pointed out. As an introduction to the key research studies presented in this article, main ventilation systems used in hard coal mines are described and three real cases of natural hazard occurrences in hard coal mines are discussed. An analysis of these events has shown that the degree of difficulty of a rescue action depends, among other aspects, on the ventilation system applied. Next, a study covering a synthetic assessment of 25 mining rescuers taking into account the ‘risky behavior’ parameter is presented. The results were interpreted considering the—described earlier—cases of hazard occurrence in coal mines and ventilation systems applied there. For the research sample, a selection of rescuers to carry out actions in particular types of ventilation systems, taking as a criterion the mark they obtained in the synthetic assessment, is proposed.

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Fault tree analysis and prevention strategies for gas explosion in underground coal mines of Pakistan

Cited by 13 publications

References 13 publications

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

Numerical modeling of longwall top coal caving method at thar coalfield

Selection of Employees for Performing Work Activities in Currently Used Ventilation Systems in Hard Coal Mining

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