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Research on downward crack closing of clay aquiclude in shallow coal seam safety mining

Journal of coal Science & Engineering(China) 2011年第3期17卷 349-354页

作者： HUANG Qing-xiang ZHANG Wen-zhong School of Energy Engineering Key Laboratory of Western Mine Exploitation and Hazard Prevention of Ministry of Education Xi＇an University of Science and Technology Xi＇an 710054 China

The water resisting property of aquiclude is the key factor of water conservation and safety mining, and the mining induced cracks in aquiclude is major factor of water resisting property. The aquiclude is composed by loess layer and red clay layer in Yushuwan coal Mine, and the water reaction property of clay and loess of aquiclude was tested by soil mechanics method. The permeability coefficient of the loess is 0.856 m/d and the clay is 0.434 m/d. The dilatability coefficient of the loess is 16.1% and the clay is 14.6%. Through physical solid-liquid simulation with whole stress-stain similarity, the distribution of ＂downward crack zone＂ and ＂upward crack zone＂ was found to be the major factor of aquiclude stability. The downward crack closing length is about 30% of the downward crack length. The expanding of clay and loess with water are principal factors of downward crack closing. At last, the mechanical model of downward crack closing was constructed, and the criterion of crack closing was put forward at all. This work will provides the theoretical base for aquiclude stability research and safety mining in shallow seam.

关键词： shallow coal seam simulation clay aquiclude downward crack crack closing

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Mechanism of Mining-induced Slope Movement for Gullies Overlaying shallow coal seams

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Journal of Mountain Science 2013年第3期10卷 388-397页

作者： WANG Xu-feng ZHANG Dong-sheng ZHANG Cheng-guo FAN Gang-wei School of mines China University of Mining and Technology State Key Laboratory of coal Resource and Mine Safety Key Laboratory of Deep coal Resource Mining Ministry of Education of China The University of New South Wales

This paper provides an improved understanding of the movement mechanisms of both bed-rock gully and sandy soil gully when underground mining occurs underneath,followed by systematic analysis of the contributing factors such as mining advance direction,gully slope angle,gully erosion coefficient and mining *** paper presents the results from monitoring,theoretical analyses and up to date modeling based on the geological features in the gully affected area,and the implications of these results to the success of roof support *** was observed that when mining occurred towards the gully,sliding of slope block along the fracture surface occurred,which resulted in unstable roof condition;when mining progressed away from the gully,polygon blocks developed in the gully slope and rotated in reversed direction forming hinged structure;within the bed-rock slope,the hinged structure was unstable due to shear failure of the polygon block;however,within the sandy soil slope,the structure was relatively stable due to the gradual rotating and subsiding of the polygon *** increase of the value of slope angle and mining height lead to a faster and more intensive fracture development within the gully slope,which had a pronounced effect on gully slope stability and underground *** remediation approaches are hence proposed in this paper including introducing more powerful support and reasonable mining height,setting up working face along or away from gullies,using room and pillar,strip mining and backfill instead of longwall mining.

关键词： coal mine shallow coal seam Gullyslope Movement mechanism Roof control Miningmethod

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Characteristics and stability of slope movement response to underground mining of shallow coal seams away from gullies

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International Journal of Mining Science and Technology 2012年第1期22卷 47-50页

作者： Zhang Dongsheng Fan Gangwei Wang Xufeng College of Geology and Exploration Engineering Xinjiang UniversityUrumchi 830046China School of Mines China University of Mining&TechnologyXuzhou 221116China State Key Laboratory of coal Resource and Mine Safety China University of Mining&TechnologyXuzhou 221008China

Underground pressure is abnormal during mining of shallow coal seams under gullies. We studied gully slope movements, subject to underground mining, with physical simulation and theoretical analysis. The rules disclose that the slope rock slides horizontally in response to mining in the direction of gullies and rotates reversely with the appearance of a polygon block in mining away from gullies. We focused our attention on the case of mining away from a gully. We built a mechanical model in terms of a polygon block hinged structure and investigated the variation of horizontal thrust and shear force at the hinged point in relation to the rotation angle under different fragmentations. The Sliding-Rotation instability conditions of the polygon block hinged structure are presented based on the analyses of sliding instability and rotation instability. These results can serve as a theoretical guide for roof control during mining away from gullies in a coalfield defined by gullies.

关键词： shallow coal seam Mining away from gullies Polygon block hinged structure Sliding instability Rotation instability

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Simulation research on the influence of eroded primary key strata on dynamic strata pressure of shallow coal seams in gully terrain

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International Journal of Mining Science and Technology 2012年第1期22卷 51-55页

作者： Zhang Zhiqiang Xu Jialin Zhu Weibing Shan Zhenjun State Key Laboratory of coal Resources and Mine Safety Xuzhou 221008China School of Mines China University of Mining&TechnologyXuzhou 221116China School of Geology&Exploration Engineering Xinjiang UniversityUrumqi 830046China

In Huojitu coal Mine of Shendong mining area, the dynamic strata pressure (DSP) accidents occurred when the working faces passed the gully terrain. Focusing on this problem, we used physical simulation experimental method to thoroughly study the influence of eroded overlying primary key strata (PKS) in the gully terrain on DSP of shallow coal seams in this paper. The result show that when mining activities took place in the uphill section of shallow coal seams in gully terrain and the PKS were eroded, the blocks could not form stable bond-beam structures since the horizontal force of PKS blocks in adjacent sloping surfaces were relatively small. The sliding instability of blocks caused rapid increase of the load on the sub-key strata (SKS) blocks, which resulted into coal slide and roof fall as well as sharp drop of active columns. This led to DSP phenomenon. When the PKS blocks were intact, there was no DSP phenomenon to enable blocks provide certain horizontal force to maintain stable bond-beam structure. The simulation results were verified by the mining practices of working face 21306 crossing the gully terrain in the Huojitu coal Mine.

关键词： strata (KS) Being eroded Gully terrain shallow coal seam Dynamic strata pressure

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