深部坚硬顶板充填工作面支架–围岩耦合作用与支护参数优化

doi:10.13722/j.cnki.jrme.2024.0130

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Abstract Backfilling mining is an effective method to reduce the mining pressure，rock movement and surface subsidence. To guide the selection of support parameters for the backfilling longwall face，taking the 1123 longwall panel of Gucheng coal mine as the background，theoretical analysis，physical simulation and on-site measurement are used to study the characteristics of rock movement under the conditions of backfilling mining with thick top coal and hard roof，to reveal the coupling relationship between the support and the surrounding rock，and to propose the optimization method of support parameters for backfilling face with thick top coal. The results show that the maximum height of mining-induced fractures under the support of backfilling body is located at the lower edge of the hard roof. The number of microseismic events in the roof is less than that in the floor，and the maximum height is 30 m. The roof load time series curve is dominated by the descending resistance type，and there is no periodic variation characteristics，indicating that the hard roof is characterised by continuous settlement. The settlement model of the hard roof is constructed and the settlement curve of“?”shape is obtained. The backfilling rate of the gob reaches 90%，and the movement mode of the hard roof changes from periodic fracture to continuous settlement type. Through uniaxial and triaxial compression experiments，combined with CT scans，it is found that after thick top coals loss restriction of the gob side，the internal fractures expand severely and the crushing coefficient increases，which reduces the backfilling ratio. A method for determining the support resistance in backfilling face is proposed. The interaction relationship between support and surrounding rock is analyzed from two aspects of stiffness coupling and strength coupling. Considering the stiffness and strength of thick top coal，the identification of support parameter optimization area is realized，and the optimization principle of support parameters of backfilling face is proposed. The resistance surface is divided into high sensitive area and low sensitive area，and it is proposed that the stiffness should be selected in the high sensitive area. The lower limit of the initial support force is the immediate roof and thick top coal load，and the upper limit value is the residual strength of thick top coal. The site industrial test of support parameters optimization of 1123 panel is carried out. It is found that the initial support force of 24 MPa exceeds the upper limit of support strength，which directly leads to the secondary breakage of thick top coal and the resistance reduction of support load time series curve. When the initial support force is reduced to 10 MPa，the load time series curve is transformed into a increase of resistance throughout the whole process，and the thick top coal in the roof control area is continuously settled. The secondary crushing and roof fall phenomenon are reduced，which significantly improves the backfilling mining efficiency.

Key words： mining engineering backfilling mining hard roof subsidence curve support-rock relation supporting parameter

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	Articles by authors
	LI Meng1
	WANG Zhaohui1
	2
	SUN Wenchao1
	WU Chuanping1
	SUN Shaolong3
	CAO Peng4
	SUN Chenglei5

Cite this article:

LI Meng1,WANG Zhaohui1,2, et al. Support-rock interaction and supporting parameter optimization in deep backfilling longwall faces with hard roof[J]. , 2024, 43(11): 2753-2765.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0130 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2753

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