Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes

The sealing depth of a gas-drainage borehole is critically important as it directly affects the efficiency of the whole drainage system. In order to determine the shortest reasonable sealing depth, in this paper, a theoretical drainage model using different sealing depths was proposed. Based on theo...

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Autores principales:	Pu Li, Zhiheng Cheng, Liang Chen, Hongbing Wang, Jialin Cao
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/26c76fa07d744da9a8cd0f83369fe6e6
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id	oai:doaj.org-article:26c76fa07d744da9a8cd0f83369fe6e6
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spelling	oai:doaj.org-article:26c76fa07d744da9a8cd0f83369fe6e62021-11-08T02:36:10ZImprovement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes1687-809410.1155/2021/5521666https://doaj.org/article/26c76fa07d744da9a8cd0f83369fe6e62021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/5521666https://doaj.org/toc/1687-8094The sealing depth of a gas-drainage borehole is critically important as it directly affects the efficiency of the whole drainage system. In order to determine the shortest reasonable sealing depth, in this paper, a theoretical drainage model using different sealing depths was proposed. Based on theoretical analysis presented, two parts of the fractures system surrounding the drainage borehole were proposed, i.e. the fractures induced by roadway excavation and the fractures induced by borehole drilling. A series of geological in-situ tests and simulations research were conducted to determine the stress and fracture distributions in the surrounding rock of the borehole. The depths of crushing zones, plastic zones and stress concentration zones were determined as 5 m, 2 m and 12 m, respectively. Meanwhile, stress simulation shows that the depth of the stress concentration zone was 12 m from the roadway wall and the stress peak was located at the depth of 8 m, which can be verified by the results of drilling penetration velocity analysis. To determine the optimum sealing depth, gas drainage holes with different sealing depths were drilled in the field. The field results revealed that the crushing zones were the main area for air leakage, and the stress concentration induced by roadway excavation assisted in the reduction of air leakage. Therefore, the optimized sealing depth should both cover the plastic zone and the stress concentration zone. The research achievements can provide a quantitative method for the determination of optimum sealing depth in cross-measure drainage boreholes.Pu LiZhiheng ChengLiang ChenHongbing WangJialin CaoHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Pu Li Zhiheng Cheng Liang Chen Hongbing Wang Jialin Cao Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
description	The sealing depth of a gas-drainage borehole is critically important as it directly affects the efficiency of the whole drainage system. In order to determine the shortest reasonable sealing depth, in this paper, a theoretical drainage model using different sealing depths was proposed. Based on theoretical analysis presented, two parts of the fractures system surrounding the drainage borehole were proposed, i.e. the fractures induced by roadway excavation and the fractures induced by borehole drilling. A series of geological in-situ tests and simulations research were conducted to determine the stress and fracture distributions in the surrounding rock of the borehole. The depths of crushing zones, plastic zones and stress concentration zones were determined as 5 m, 2 m and 12 m, respectively. Meanwhile, stress simulation shows that the depth of the stress concentration zone was 12 m from the roadway wall and the stress peak was located at the depth of 8 m, which can be verified by the results of drilling penetration velocity analysis. To determine the optimum sealing depth, gas drainage holes with different sealing depths were drilled in the field. The field results revealed that the crushing zones were the main area for air leakage, and the stress concentration induced by roadway excavation assisted in the reduction of air leakage. Therefore, the optimized sealing depth should both cover the plastic zone and the stress concentration zone. The research achievements can provide a quantitative method for the determination of optimum sealing depth in cross-measure drainage boreholes.
format	article
author	Pu Li Zhiheng Cheng Liang Chen Hongbing Wang Jialin Cao
author_facet	Pu Li Zhiheng Cheng Liang Chen Hongbing Wang Jialin Cao
author_sort	Pu Li
title	Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
title_short	Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
title_full	Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
title_fullStr	Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
title_full_unstemmed	Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes
title_sort	improvement of gas drainage efficiency via optimization of sealing depth of cross-measure boreholes
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/26c76fa07d744da9a8cd0f83369fe6e6
work_keys_str_mv	AT puli improvementofgasdrainageefficiencyviaoptimizationofsealingdepthofcrossmeasureboreholes AT zhihengcheng improvementofgasdrainageefficiencyviaoptimizationofsealingdepthofcrossmeasureboreholes AT liangchen improvementofgasdrainageefficiencyviaoptimizationofsealingdepthofcrossmeasureboreholes AT hongbingwang improvementofgasdrainageefficiencyviaoptimizationofsealingdepthofcrossmeasureboreholes AT jialincao improvementofgasdrainageefficiencyviaoptimizationofsealingdepthofcrossmeasureboreholes
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Improvement of Gas Drainage Efficiency via Optimization of Sealing Depth of Cross-Measure Boreholes

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