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Mechanical analysis of effective pressure relief protection range of upper protective seam mining

矿业科学技术学报：英文版 2017年第3期27卷 537-543页

作者： Yin Wei miao xiexing Zhang Jixiong Zhong Sijian School of Mines Key Laboratory of Deep Coal Resource Ministry of Education China University of Mining & Technology Xuzhou 221116 China State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining & Technology Xuzhou 221116 China

This paper analyzes the control mechanism of coal and gas outbursts and proposes the concept of an effective pressure relief protection range, based on the stress relief of the underlying coal-rock mass and the development of a plastic zone. Also this study developed a stress change and fracture development model of the underlying coal-rock mass. In addition, the stress and depth of fracture of any point in the floor were deduced with the application of Maple Calculation Software. The specific engineering parameters of the Pingdingshan No. 12 colliery were applied to determine the relationship between the depth of fracture in the floor and the mining height. The pressure-relief principle of the underlying coal-rock mass was analyzed while varying the mining height of the upper protective seam. The findings indicate that as the depth of fracture in the floor increases, the underlying coal-rock mass experiences a limited amount of pressure relief, and the pressure relief protection range becomes ***, the stress distribution evolves from a ‘‘U" shape into a ‘‘V" shape. A 2.0 m mining height of protective seam situates the outburst-prone seam, Ji_(15), within the effective pressure relief protection range. The fracture development and stress-relief ratio rises to 88%, ensuring the pressure-relief effect as well as economic benefits. The measurement data show that: after mining the upper protective seam, the gas pressure of Ji_(15) dropped from 1.78 to 0.35 MPa, demonstrating agreement between the engineering application and the theoretical calculation.

关键词： Upper protective seam Principle of pressure relief Effective protection range Gas pressure

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Non-destructive testing and pre-warning analysis on the quality of bolt support in deep roadways of mining districts

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International Journal of Mining Science and Technology 2017年第6期27卷 989-998页

作者： Zhang Houquan miao xiexing Zhang Guimin Wu Yu Chen Yanlong State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou 221116 China School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou 221116 China

The bolt support quality of coal roadways is one of the important factors for the efficiency and security of coal production. By means of a self-developed technique and equipment of random non-destructive testing, non-destructive detection and pre-warning analysis on the quality of bolt support in deep roadways of mining districts were performed in a number of mining areas. The measured data were obtained in the detection instances of abnormal in-situ stress and support invalidation etc. The corresponding relation between axial bolt load variation and roadway surrounding rock deformation and stability was summarized in different mining service stages. Pre-warning technology of roadway surrounding rock stability is proposed based on the detection of axial bolt load. Meanwhile, pre-warning indicators of axial bolt load in different mining service stages are offered and some successful pre-warning cases are also *** research results show that the change rules of axial bolt load in different mining service stages are quite similar in different mining areas. The change of axial bolt load is in accord with the adjustment of surrounding rock stress, which can consequently reflect the deformation and stability state of roadway surrounding rock. Through the detection of axial bolt load in different sections of roadways, the status of real-time bolt support quality can be reflected; meanwhile, the rationality of bolt support design can be evaluated which provides reference for bolting parameters optimization.

关键词： Deep roadways Bolt support quality Random nondestructive testing Surrounding rock stability Prediction and pre-warning

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Gateside packwall design in solid backfill mining-A case study

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International Journal of Mining Science and Technology 2016年第2期26卷 261-265页

作者： Jiang Haiqiang miao xiexing Zhang Jixiong Liu Shiwei School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education of China

Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway support system has been *** on the Winkler foundation and beam model,the current study presents a static analysis of the model,thus permitting acquisition of a theoretical formula pertaining to roof *** use of working face 6304-1(Jisan Colliery) as the research setting,the association between roof convergence magnitude and both packwall strength and width have been *** upon observed conditions at the working face,realistic packwall parameters have been formulated,with numerical simulation results and field application results indicating that design parameters garnered from the developed formula successfully adapted to local geological movement and ***,roadway deformation was shown to be within the permissible range,thus satisfying mine production *** proposed method in the current study may give a design basis for pack design in the context of SBM under similar conditions.

关键词： Packwall design Solid backfill mining Roof convergence Winkler foundation and beam model Numerical simulation

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Overlying strata movement of recovering standing pillars with solid backfilling by physical simulation

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International Journal of Mining Science and Technology 2016年第2期26卷 301-307页

作者： An Baifu miao xiexing Zhang Jixiong Ju Feng Zhou Nan School of Mines China University of Mining & Technology State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology

To analyze the overlying strata movement law of recovering room mining standing pillars with solid *** simulation experiments with sponge and wood as the backfilling simulation material were *** results show that:(i) The covering-rock mechanics of the overly strata comes from "two-arch structures + hinged girder + bend beam" to "backfilling material + hinged girder + bent beam" by increasing the fill ratio from 0%to 85%,the beginning of overlying strata movement appears later and the total duration of subsidence velocity increased from zero to the highest value *** trend of "single polarization" of the subsidence velocity curves becomes noticeable and the velocity variation trend becomes stable,(ii) The equiponderate aeolian sand was added to improve the anti-pressure ability of the loess,and the corresponding ground processing & transportation system was designed.

关键词： Room mining standing pillars Solid backfilling Physical simulation experiment Overlying strata movement

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Discrimination conditions and process of water-resistant key strata

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Mining Science and Technology 2010年第2期20卷 224-229页

作者： WANG, Lianguo miao, xiexing WU, Yu SUN, Jian YANG, Hongbo state key laboratory of geomechanics & deep underground engineering china university of mining & technologyxuzhou 221008china

Water-preservation mining is one of the most important parts of the ‘Green Mining' technology system,which can realize the effective regulation of groundwater resources by controlling strata movement,changing passive prevention and governance of water disasters to active conservation and utilization of groundwater resources and thus obtaining coal and water simultaneously in *** concept of water-resistant key strata further enriches the content of the key stratum theory and provides a theoretical basis for water-preservation *** order to realize the idea of water-resistant key strata as a guideline in the design of water-preservation mining and engineering applications,the conditions for discrimination in the process of water-resistant key strata,we have presented a mechanical model,as well as its corresponding computer program,based on a large number of theoretical analyses and field measurements,as well as on a comprehensive consideration of the position,structural stability and seepage stability of key *** engineering applications indicate that this discrimination method and its corresponding computer program on water-resistant key strata are accurate and reliable and can satisfy the actual design needs of water-preservation mining and thus have instructional importance for water-preservation mining in mining areas lacking water.

关键词： water-resistant key stratum water-preservation mining structural stability seepage stability

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Green coal mining technique integrating mining-dressing-gas draining-backfilling-mining

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International Journal of Mining Science and Technology 2017年第1期27卷 17-27页

作者： Zhang Jixiong Zhang Qiang Spearing A.J.S.(Sam) miao xiexing Guo Shuai Sun Qiang Ministry of Education's Key Laboratory of Deep Coal Resource Mining School of MinesChina University of Mining and TechnologyXuzhou 221116China Western Australian School of Mines Curtin UniversityKalgoorlie 6433Australia State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

Aiming to address the following major engineering issues faced by the Pingdingshan No. 12 mine:(1) difficulty in implementing auxiliary lifting because of its depth(i.e., beyond 1000 m);(2) highly gassy main coal seam with low permeability;(3) unstable overlying coal seam without suitable conditions for implementing conventional mining techniques for protective coal seam; and(4) predominant reliance on ‘‘under three" coal resources to ensure production output. This study proposes an integrated, closed-cycle mining-dressing-gas draining-backfilling-mining(MDGBM) technique. The proposed approach involves the mining of protective coal seam, underground dressing of coal and gangue(UDCG), pressure relief and gas drainage before extraction, and backfilling and mining of the protected coal seam. A system for draining gas and mining the protective seam in the rock stratum is designed and implemented based on the geological conditions. This system helps in realizing pressure relief and gas drainage from the protective seam before extraction. Accordingly, another system, which is connected to the existing production system, is established for the UDCG based on the dense medium-shallow trough process. The mixed mining workface is designed to accommodate both solid backfill and conventional fully mechanized coal mining, thereby facilitating coal mining, USCG, and backfilling. The results show that: The mixed mining workface length for the Ji15-31010 protected seam was 220 m with coal production capacity 1.2 million tons per year, while the backfill capacity of gangue was 0.5 million tons per year. The gas pressure decreased from 1.78 to 0.35 MPa, and the total amount of safely mined coal was 1.34 million tons. The process of simultaneously exploiting coal and draining gas was found to be safe, efficient, and *** process also yielded significant economic benefits.

关键词： Integrated green mining technique Protective and protected coal seams Mixed workface Solid backfill with gangueGas drainage

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Construction and stability of an extra-large section chamber in solid backfill mining

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International Journal of Mining Science and Technology 2014年第6期24卷 763-768页

作者： Ju Feng Li Meng Zhang Jixiong miao xiexing Liu Zhan State Key Laboratory of Geomechanics & Deep Underground Engineering China University of Mining & Technology School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education of China China University of Mining & Technology

In solid backfill mining without gangue removal, the gangue is separated directly underground and backfilled into goaf. This necessitates the underground construction of an extra-large section chamber for separation equipments. For the construction of an extra-large section chamber in the Tangshan mine, we proposed an active support through a combination of bolting, anchor cables, lining, and a reinforced chamber floor by inverted arch pouring. ABAQUS software was used to analyze the surrounding rock deformation and the plastic zone development of the chamber under different excavation *** best excavation scheme was determined, and the effectiveness of the combined supports was verified. In practice, the engineering installation showed good overall control of the movement of the surrounding rock, with roof-to-floor and side-to-side convergences of 154.6 and 77.5 mm, respectively,which meets the requirements for underground coal gangue separation.

关键词： Solid backfill coal mining Extra-large section chamber Effective support Numerical simulation

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Effects of annealing condition and Al content on novel Fe_(73.5)Si_(13.5)B_9Cu_1Nb_(3-x)Al_x alloys

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Rare Metals 2008年第5期27卷 545-549页

作者： LIU Haishun DU Youwei miao xiexing HAN Kui SHEN Xiaopeng BU Wankui School of Sciences China University of Mining ＆ Technology Xuzhou 221008 China National Key Laboratory of Solid State Microstructure Nanjing University Nanjing 210093 China

The annealing condition, AI content, and field amplitude dependences of the complex permeability for Nb-poor Finemet type alloys, Fe73.5Si13.5B9Cu1Nba-xAlx （x = 0, 0.5, 1.5, 2.0, and 3.0）, were investigated using an impedance analyzer and X-ray diffraction. The results show that different AI contents lead to different optimum annealing conditions, and the A1 content exerts a distinct effect on microstructure thus resulting in a variety of real permeability value. For the samples annealed at 793 K for 0.5 h, the real permeability increases with an increase in A1 content when the AI content is below 2.0 at.%; as for those annealed at 793 K for 1 h and at 813 K for 0.5 h, an overall increase in real permeability can be obtained compared to those annealed at 793 K for 0.5 h. The permeability under different field amplitudes is also studied and it is found that the relaxation frequency in the lower frequency region tends to moving toward a higher frequency with an increase in field amplitude. All these might be because of the role of Nb in the annealing process and the solubility of AI in the amorphous matrix and nanocrystallized crystallites.

关键词： magnetism magnetic property impedance analysis Fe-based alloys

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采动岩体的力学行为研究与相关工程技术创新进展综述

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岩石力学与工程学报 2010年第10期29卷 1988-1998页

作者：缪协兴中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221008

简要回顾采动岩层结构破断与运动研究的发展过程,指出:采动岩层结构破断与运动不仅控制采场与回采巷道矿压显现,同时还控制采动岩层移动与地表沉陷以及控制采动岩体裂隙演化与渗流。随着对采动岩体特殊力学行为规律研究的深入,利用与控... 详细信息

简要回顾采动岩层结构破断与运动研究的发展过程,指出:采动岩层结构破断与运动不仅控制采场与回采巷道矿压显现,同时还控制采动岩层移动与地表沉陷以及控制采动岩体裂隙演化与渗流。随着对采动岩体特殊力学行为规律研究的深入,利用与控制这些特殊力学行为就形成系列的采矿工程技术创新,在此用工程图例的方式列出一组成果。重点综述在研究岩层移动与地表沉陷规律基础上开发出的综合机械化固体(废弃物)直接充填采煤技术和快速充填大断面沿空留巷技术;在研究采动岩体裂隙演化与渗流规律基础上开发出的煤与瓦斯共采技术和保水采煤技术,包括这4项创新技术的发展过程、最新进展和重要技术参数指标等。

关键词：采矿工程采动岩体结构固体充填采煤煤与瓦斯共采保水采煤

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A CREEP DAMAGE EQUATION FOR ROCKS

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Acta Mechanica Solida Sinica 1994年第4期7卷 318-322页

作者： miao xiexing Chen Zhida (China University of Mining & Technology,Xuzhou 221008,P.R.China) China University of Mining and Technology Xuzhau 221008 China

In this paper,based on many experimental results,a creep damage equation for rocks with a creep modulus that can describe the history of damage has been *** to the equation,a creep damage model for rock materials is constructed,and it is shown that the extent of their damage,or damage degree,during creep can be determined by means of simple experiments.

关键词： rock creep rock damage rock damage model

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