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Your search keyword '"Lin, Baiquan"' showing total 147 results
Start Over Author "Lin, Baiquan" Publisher elsevier bv
147 results on '"Lin, Baiquan"'

25. Blasting-enhanced water injection for coal and gas out-burst control

Author

Sankhaneel Sinha, Lin Minghua, Gabriel Walton, Li Guangtao, Yang Wei, Changzheng Lu, and Lin Baiquan

Subjects
021110 strategic, defence & security studies, Environmental Engineering, business.industry, General Chemical Engineering, Water injection (oil production), 0211 other engineering and technologies, Coal mining, 02 engineering and technology, 010501 environmental sciences, Gas concentration, 01 natural sciences, Stress relief, Stress (mechanics), Mining engineering, Environmental Chemistry, Environmental science, Coal, Water volume, Safety, Risk, Reliability and Quality, business, 0105 earth and related environmental sciences, Rock blasting
Abstract

Coal and gas out-bursts are a major risk in deep gassy coal mines. In order to minimize the out-burst potential during the mining process, we propose a novel blast-injection integrated (BII) technology. In this technology, a group of de-stress blasts are first used to de-stress the area near the active mining face and push the stress peak further away from the mining face. The cracks generated by the blasting improve the connectivity between the pre-existing fractures and promote gradual release of gas at the mining face. This is followed by water injection directly into the coal seam through the blast holes. The injection of water can greatly improve coal plasticity and reduce the initial speed of gas diffusion, ultimately reducing the potential for violent out-bursts. To implement this technology, a set of devices were developed that include hole packers and transport and safety accessories. The BII technology was subsequently tested at an active mine. It was found that the stress relief zone in front of the coal face increased longitudinally by ∼5 m, and the rate of gas emission at the mining face doubled within 30 min after the de-stress blasting. The injection water volume after the de-stress blasting also increased by 25 times compared to the un-blasted condition, and the monthly gas concentration in the return airway decreased from 0.58% to 0.36%. Additionally, the concentration of dust in the return airway was found to decrease. Based on the field test results, it was concluded that BII technology is an effective measure to limit coal and gas out-burst potential.

Published
2020

40. A new method for determining coal seam permeability redistribution induced by roadway excavation and its applications

Author

Chenglin Jiang, Liu Huihui, and Lin Baiquan

Subjects
animal structures, Environmental Engineering, General Chemical Engineering, 0211 other engineering and technologies, Borehole, ComputerApplications_COMPUTERSINOTHERSYSTEMS, 02 engineering and technology, 010501 environmental sciences, complex mixtures, 01 natural sciences, Mining engineering, Environmental Chemistry, Coal, Safety, Risk, Reliability and Quality, 0105 earth and related environmental sciences, 021110 strategic, defence & security studies, business.industry, Coal mining, Gas emissions, Excavation, Permeability (earth sciences), embryonic structures, Initial permeability, Environmental science, business, Stage iv
Abstract

Changes in coal seam permeability induced by roadway excavation may lead to many engineering problems, such as low gas extraction concentration in in-seam boreholes, coal and gas outburst disasters, and gas emissions in the process of coal roadway excavation. To solve these problems, this paper proposed a new method to directly determine the distribution of coal seam permeability around roadways. For this purpose, method principle was analyzed, equipment was developed, and field experiments were carried out in Baiyangling coal mine. Finally, the engineering applications of the method were analyzed, and a field application effect experiment was conducted to verify the new method. The results showed that the coal seam permeability around roadways was divided into four stages. In stages I and II, permeability increased, in stage III, permeability decreased, and stage IV maintained the initial permeability of the coal seam. These test results will aid in increasing the gas extraction concentration of in-seam boreholes and will guide the design of gas control areas. Using the verification experiment, it was concluded that the new method is able to accurately determine the redistribution of coal seam permeability caused by roadway excavation and provide theoretical guidance in solving engineering problems.

Published
2019

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