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Stability influence factors analysis and construction of a deep beam anchorage structure in roadway roof

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International Journal of Mining Science and Technology 2018年第3期28卷 445-451页

作者： Xie Shengrong Gao Mingming Chen Dongdong Sun Yanding Pan Hao Su Hai Lan Shizhong Faculty of Resource and Safety Engineering China University of Mining and Technology Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology School of Mechanics and Civil Engineering China University of Mining and Technology yuwu coal industry Group co.ltd. Shanxi Luan Mining Group

Deep beam anchorage structures based on spatial distribution analysis of the cable prestressed field have been proposed for roadway roof support, Stability and other factors that influence deep beam structures are studied in this paper using mechanical calculations, numerical analysis and field measurements, A mechanical model of deep beam structure subjected to multiple loading is established, including analysis of roof support in the return airway of S1203 working face in the yuwu coal mine, China, The expression of maximum shear stress in the deep beam structure is deduced according to the stress superposition criterion, It is found that the primary factors affecting deep beam structure stability are deep beam thickness, cable pre-tension and cable spacing, The variation of maximum shear stress distribution and prestressed field diffusion effects according to various factors are analyzed using Matlah and FLAC3DTM software, and practical support parameters of the S1203 return airway roof are determined, According to the observations of rock pressure, there is no evidence of roof separation, and the maximum values of roof subsidence and convergence of wall rock are 72 and 48 mm, respectively, The results show that the proposed roof support design with a deep beam structure is feasible and achieves effective control of the roadway roof,

关键词： Support structure Deep beam Maximum shear stress Influencing factors Stability control Roadway roof

Study on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application

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International Journal of Mining Science and Technology 2015年第3期25卷 503-510页

作者： Su Hai Bai Jianbiao Yan Shuai Chen Yong Zhang Zizheng School of Resources and Safety Engineering China University of Mining and Technology yuwu coal co. ltd Shanxi Lu’an Mining Group School of Mines China University of Mining and Technology State Key Laboratory of coal Resources and Safe Mining China University of Mining and Technology

Based on the engineering background of gob-side entry retaining in fully-mechanized longwall with top coal caving(GER-FLTC) on N2105 working face of yuwu coal mine, by adopting the methods of theoretical analysis and numerical calculation, the control techniques of surrounding rocks in GER-FLTC working face are studied in this paper. The two main difficulties of stability of surrounding rocks at gob-side retained entry in fully-mechanized longwall working face are the stability control of top coal and control of large deformation of GER-FLTC working face. Interaction mechanical model between roofing and roadside backfilling in GER-FLTC is established and the equations for the calculation of roof-cutting resistance of roadside backfilling are derived. Results of numerical calculation show that the damage zones of top coal can be categorized into the delaminating zone of top coal above the backfilling, tensile damage zone of top coal above the retained roadway and shear damage zone of the upper rib of the solid coal. Stability control of top coal is the critical part to success of GER-FLTC. With consideration of large deformation of surrounding rocks of gob-side retained entry in fully-mechanized longwall, the support technique of‘‘roofing control and wall strengthening'' is proposed where high strength and highly prestressed anchor rods and diagonal tensile anchor cables support are used for top coal, high strength and highly prestressed yielding anchor rod support is used for solid coal and roadside prestressed load-carrying backfilling is constructed by high-water material, in order to maintain the integrity of the top coal, transfer load, high resistance yielding load-carrying of solid coal, roof-cutting of roadside backfilling and support,and to achieve GER-FLTC. Results from this study are successfully applied in engineering practice.

关键词： Gob-side entry retaining in fully-mechanized longwan with top coal caving Stability control of top coalLarge deformation control Roofing control and wall strengthening

Research Progress of Atmospheric Volatile Organic compounds: A Case Study of Printing industry

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Meteorological and Environmental Research 2018年第4期9卷 94-99,105页

作者： Lin Zhao Huang Zhipeng Chen yuwu Guangdong Jizhizhun Testing co. Ltd.

In this paper, pollution harm, pollution source, emission characteristics and pollution control progress of VOCs are introduced. Taking printing industry as an example, pollution status and existing control measures of VOCs in printing industry are analyzed. Finally, prevention and control countermeasures of VOCs pollution in printing industry are proposed.

关键词： VOCs Printing industry Research progress

Capturing 2D van der Waals magnets with high probability for experimental demonstration from materials science literature

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InfoMat 2023年第4期5卷 39-47页

作者： Haiyang Song Yinghe Zhao Eleanor Turner yuwu Yuan Li Menghao Wu Guang Feng Huiqiao Li Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanthe People's Republic of China Department of Chemical&Biological Engineering Monash UniversityClayton CampusClaytonVictoriaAustralia School of Physics Huazhong University of Science and TechnologyWuhanthe People's Republic of China State Key Laboratory of coal combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhanthe People's Republic of China

2D van der Waals(vdW)magnets have opened intriguing prospects for next-generation spintronic *** learning techniques and density functional theory calculations enable the discovery of 2D vdW magnets to be accelerated;however,current computational frameworks based on these state-ofthe-art approaches cannot offer probability analysis on whether a 2D vdW magnet can be experimentally ***,a new framework can be established to overcome this *** the framework,2D vdW magnets with high probability for experimental demonstration are captured from materials science *** key to the successful establishment is the introduction of the theory of mutual *** validation of predictions substantiates the high reliability of the *** example,half of the 302D vdW magnets discovered in the literature published prior to 2017 have been experimentally demonstrated in the subsequent *** framework has the potential to become a revolutionary force for progressing experimental discovery of 2D vdW magnets.

关键词： 2D vdW magnets mutual information neural networks

Numerical analysis of matrix swelling and its effect on microstructure of digital coal and its associated permeability during co_(2)-ECBM process based on X-ray CT data

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Petroleum Science 2023年第1期20卷 87-101页

作者： Hui-Huang Fang Zhang-Fei Wang Shu-Xun Sang Yan-Hui Huang School of Earth and Environment Anhui University of Science and TechnologyHuainanAnhui232001China Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui230000China Low Carbon Energy Institute China University of Mining and TechnologyXuzhouJiangsu221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhouJiangsu221116China Jiangsu Key Laboratory of coal-based Greenhouse Gas control and Utilization China University of Mining and TechnologyXuzhouJiangsu221008China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China

Matrix swelling effect will cause the change of microstructure of coal reservoir and its permeability,which is the key factor affecting the engineering effect of co_(2)-ECBM *** Sihe and yuwu collieries are taken as research ***,visualization reconstruction of coal reservoir is ***,the evolution of the pore/fracture structures under different swelling contents is ***,the influence of matrix phase with different swelling contents on permeability is ***,the mechanism of swelling effect during the co_(2)-ECBM process is further *** results show that the intra-matrix pores and matrix-edge fractures are the focus of this study,and the contacting area between matrix and pore/fracture is the core area of matrix *** number of matrix particles decreases with the increase of size,and the distribution of which is isolated with small size and interconnected with large *** swelling effect of matrix particles with larger size has a great influence on the pore/fracture *** number of connected pores/fractures is limited and only interconnected in a certain *** the increase of matrix swelling content,the number,porosity,width,fractal dimension,surface area and volume of pores/fractures decrease,and their negative contribution to absolute permeability increases from 0.368% to 0.633% and 0.868%-1.404%,*** the increase of swelling content,the number of intra-matrix pores gradually decreases and the pore radius becomes shorter during the co_(2)-ECBM *** matrix continuously expands to the connected fractures,and the width of connected fractures gradually *** the influence of matrix swelling,the bending degree of fluid flow increases gradually,so the resistance of fluid migration increases and the permeability gradually *** study shows that the matrix swelling effect is the key factor affecting CBM recovery,and the application of this effec

关键词： Matrix swelling co_(2)-ECBM Absolutely permeability Numerical analysis X-ray CT Qinshui Basin