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International Journal of Mining Science and Technology 2019年第6期29卷 955-962页

作者： Defu Zhu shihao tu Hongsheng tu Zhenqian Yang State Key Laboratory of Deep Coal Resource China University of Mining and Technology

In the practice of mining shallow buried ultra-close seams,support failure tends to occur during the process of longwall undermining beneath two layers of room mining goaf(TLRMG).In this paper,the factors causing support failure are summarized into geology and mining *** column lithology and composite beam theory,the key stratum of the rock strata is determined.A finite element numerical simulation is used to analyze the overlying load distribution rule of the main roof for different plane positions of the upper and lower room mining *** tributary area theory(TAT)is adopted to analyze the vertical load distribution of each pillar,and dynamic models of coal pillar instability and main roof fracture are *** key block instability analysis,two critical moments are established,of which critical moment A has the greater dynamic load *** economic losses and safety hazards are created by the dynamic load of the fracturing of the main *** reduce these negative effects,a method of pulling out supports is developed and two alternative measures for support failure prevention are proposed:reinforcing stope supports in conjunction with reducing mining height,or drilling ground holes to pre-split the main *** on a comprehensive consideration of economic factors and the two categories of support failure causes,the method of reinforcing stope supports while reducing mining height was selected for use on the mining site.

关键词： Multiple room mining goaf Mechanism of supports failure Numerical simulation Prevention measure

Rules of distribution in a plastic zone of rocks surrounding a roadway affected by tectonic stress

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Mining Science and Technology 2010年第1期20卷 47-52页

作者： LU Yan tu shihao State Key Laboratory of Coal Resources and Mine Safety Xuzhou 221116 China School of Mining Engineering China University of Mining & Technology Xuzhou 221116 China

In order to study the rules of distribution in a plastic zone of rocks, surrounding a roadway, affected by tectonic stress, we first analyzed the mechanics of a roadway affected by tectonic stress and derived a theoretical formula for the plastic zone of rocks surrounding a roadway. We also analyzed the distribution characteristics of the plastic zone under different levels of tectonic stress, vertical pressure, cohesion and friction angle of the surrounding rock. Secondly, we used numerical simulation to analyze the range and shape features of the plastic zone of rocks surrounding the roadway, given different tectonic stress levels. Finally we used a rock drilling detector to carry out field measurements on the broken state of rock surrounding the roadway at the –700 substation and channels in the Xinzhuang mine of the Shenhuo mining area. Given the measured ground stress, we analyzed the relationship between tectonic stress and the distribution of this plastic zone. Our results show that the range of the plastic zone at the top and bottom of the roadway increases with an increase in tectonic stress and this increase is especially obvious at the roadway corner.

关键词： tectonic stress rock surrounding a roadway plastic zone

Theoretical analysis on the deformation characteristics of coal wall in a longwall top coal caving face

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International Journal of Mining Science and Technology 2015年第2期25卷 199-204页

作者： Bai Qingsheng tu shihao Li Zhaoxin tu Hongsheng School of Mines Key Laboratory of Deep Coal ResourceMinistry of EducationChina University of Mining & Technology

Against the background of analyzing coal wall stability in 14101 fully mechanized longwall top coal caving face in Majialiang coal mine,based on the torque equilibrium of the coal wall,shield support and the roof strata,an elastic mechanics model was established to calculate the stress applied on the coal *** displacement method was used to obtain the stress and deformation distributions of the coal *** study also researched the influence of support resistance,protective pressure to the coal wall,fracture position of the main roof and mining height on the coal wall *** following conclusions are drawn:(1) The shorter the distance from the longwall face,the greater the vertical compressive stress and horizontal tensile stress borne by the coal *** coal wall is prone to failure in the form of compressive-shear and tension;(2) With increasing support resistance,the revolution angle of the main roof decreases *** the support resistance and protective force supplied by the face guard increases,the maximum deformation of the coal wall decreases linearly;(3) As the face approaches the fracture position of the main roof,coal wall horizontal deformation increases significantly,and the coal wall is prone to instability;and(4) The best mining height of 14101 longwall face is 3.0 m.

关键词： Longwall top coal caving face Coal wall deformation Torque equilibrium Displacement method Parametric analysis

Auxiliary transportation mode in a fully-mechanized face in a nearly horizontal thin coal seam

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International Journal of Mining Science and Technology 2015年第6期25卷 963-968页

作者： Wang Chen tu shihao Zhang Lei Yang Qianlong tu Hongsheng School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining & Technology China-Australia Mining Research Center China University of Mining & Technology

On fully-mechanized faces in nearly horizontal thin coal seams （NHTCS）, the selection of the auxiliary transportation mode is difficult. Generally, auxiliary transportation mainly includes trackless or rail transportation. Combined with a familiar NHTCS fully-mechanized face, a multi-attribute decision- making model was set up for the decision. The index weight was objectively determined with the fuzzy number and entropy method. The priority order of auxiliary transportation modes was obtained from the Preference Ranking Organization Method for Enrichment Evaluation （PROMETHEE）. The results show that： the net flow of the mode can be expressed by the function of the surrounding rock deformation of the roadway, the dimension of equipment and the thickness of the coal seam; Based on the cost type index, there is a positive correlation between the net flow with the height and width of the trackless auxiliary transportation equipment, respectively. The trackless auxiliary transportation equipment selection principle should be ＂height first then width＂. Combined with the field application of the trackless auxil- iary transportation in Liangshuijing coal mine, the proper method to achieve the safe and high-efficient exploitation of a NHTCS fully-mechanized face is trackless tvred vehicle auxiliary transportation.

关键词： Nearly horizontalTrackless transportationRail transportationPROMETHEEEntropy methodEquipment selection

Hydraulic support crushed mechanism for the shallow seam mining face under the roadway pillars of room mining goaf

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International Journal of Mining Science and Technology 2017年第5期27卷 853-860页

作者： Wang Fangtian Duan Chaohua tu shihao Liang Ningning Bai Qingsheng State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining&TechnologyXuzhou 221116China School of Economics and Management Longyan UniversityLongyan 364000China

While the fully-mechanized longwall mining technology was employed in a shallow seam under a room mining goaf and overlained by thin bedrock and thick loose sands, the roadway pillars in the abandoned room mining goaf were in a stress-concentrated state, which may cause abnormal roof weighting, violent ground pressure behaviours, even roof fall and hydraulic support crushed(HSC) accidents. In this case,longwall mining safety and efficiency were seriously challenged. Based on the HSC accidents occurred during the longwall mining of 3-1-2 seam, which locates under the intersection zone of roadway pillars in the room mining goaf of 3-1-1 seam, this paper employed ground rock mechanics to analyse the overlying strata structure movement rules and presented the main influence factors and determination methods for the hydraulic support working resistance. The FLAC3 D software was used to simulate the overlying strata stress and plastic zone distribution characteristics. Field observation was implemented to contrastively analyse the hydraulic support working resistance distribution rules under the roadway pillars in strike direction, normal room mining goaf, roadway pillars in dip direction and intersection zone of roadway pillars. The results indicate that the key strata break along with rotations and reactions of the coal pillars deliver a larger concentrated load to the hydraulic support under intersection zone of roadway pillars than other conditions. The ‘‘overburden strata-key strata-roadway pillars-immediate roof" integrated load has exceeded the yield load that leads to HSC accidents. Findings in HSC mechanism provide a reasonable basis for shallow seam mining, and have important significance for the implementation of safe and efficient mining.

关键词： Shallow seam Room mining goaf Longwall mining Hydraulic support crushed mechanism Safe and efficient mining

Technology of back stoping from level floors in gateway and pillar mining areas of extra-thick seams

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International Journal of Mining Science and Technology 2014年第2期24卷 143-149页

作者： tu Hongsheng tu shihao Zhang Xiaogang Li Zhaoxin Jia Shuai School of Mines China University of Mining & TechnologyKey Laboratory of Deep Coal Resource MiningMinistry of Education

According to the special requirements of secondary mining of resources in gateway-and-pillar goal in extra-thick seams of Shanxi, this paper presents a technical proposal of back stoping from level floors. Numerical simulation and theoretical analysis are ccsed to investigate the compaction characteristics of cavities under stress as well as an appropriate mining height of the primary-mining layer based on dif- ferent mining widths and pillar widths. For Yangjian coal mine, the mining thickness of the first seam during back stoping from level floor is determined to be 3 m, which meets the relevant requirements. Gateway-and-pillar goaf of a single layer has a range of influence of 9 m vertically. If gateway-and-pillar goaf occurs both in 9-1 and 9-5 layers, the range is extended to within 11.2 m. When the mining width of a gateway is less than 2 m or larger than 5 m, the gateway-and-pillar goal in the upper layer of the primary-mining seam can be filled in and compacted after stoping. When the working face is 2 m away from the gateway and pillar before entering into it and after passing through it, the coal body under the gateway and pillar is subjected to relatively high stress. During mining of the upper layer, moreover, the working face should interlock the goaf in primary-mining layer for 20 m.

关键词： Gateway-and-pillar goaf Back stoping from level floor Secondary mining Numerical simulation Stress evolution

Study of energy-efficient heat resistance and cooling technology for high temperature working face with multiple heat sources in deep mine

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International Journal of Coal Science & Technology 2023年第3期10卷 92-107页

作者： Hongbin Zhao shihao tu Xun Liu Jieyang Ma Long Tang Key Laboratory of Deep Coal Resource Mining(Ministry of Education of China) School of MinesChina University of Mining and TechnologyXuzhou 221116China

In the present research,we proposed a scheme to address the issues of severe heat damage,high energy consumption,low cooling system efficiency,and wastage of cold capacity in *** elucidate the seasonal variations of environmental temperature through field measurements,we selected a high-temperature working face in a deep mine as our engineering *** enhance the heat damage control cability of the working face and minimize unnecessary cooling capac-ity loss,we introduced the multi-dimensional heat hazard prevention and control method called"Heat source barrier and cooling equipment".First,we utilize shotcrete and liquid nitrogen injection to eliminate the heat source and implemented pressure equalization ventilation to disrupt the heat transfer path,thereby creating a heat ***,we establish divi-sional prediction models for airflow temperature based on the variation patterns obtained through numerical ***,we devise the location and dynamic control strategy for the cooling equipment based on the prediction *** results of field application show that the heat resistance and cooling linkage method comply with the safety requirement throughout the entire mining cycle while effectively reducing energy *** ambient temperature is maintained below 30℃,resulting in the energy saving of 10%during the high-temperature period and over 50%during the low-temperature *** findings serve as a valuable reference for managing heat damage in high-temperature working faces.

关键词： High-temperature working face Heat source barrier Multiple heat source effect Airflow temperature prediction Dynamic control strategy

System dynamics model of the support-surrounding rock system in fully mechanized mining with large mining height face and its application

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International Journal of Mining Science and Technology 2013年第6期23卷 879-884页

作者： Yuan Yong tu shihao Zhang Xiaogang Li Bo School of Mines China University of Mining&Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining&Technology

Fully mechanized mining with large mining height(FMMLMH)is widely used in thick coal seam mining face for its higher recovery ratio,especially where the thickness is less than 7.0 ***,because of the great mining height and intense rock pressure,the coal wall rib spalling,roof falling and the instability of support occur more likely in FMMLMH working face,and the above three types of disasters interact with each other with complicated *** order to get the relationship between each two of coal wall,roof,floor and support,and reduce the occurrence probability of the three types of disasters,we established the system dynamics(SD)model of the support-surrounding rock system which is composed of"coal wall-roof-floor-support"(CW-R-F-S)in a FMMLMH working face based on the condition of No.15104 working face in Sijiazhuang coal *** the software of Vensim,we also simulated the interaction process between each two factors of roof,floor,coal wall and the *** results show that the SD model of"CW-R-F-S"system can reveal the complicated and interactive relationship clearly between the support and surrounding rock in the FMMLMH working *** increasing the advancing speed of working face,the support resistance or the length of support guard,or by decreasing the tipto-face distance,the stability of"CW-R-F-S"system will be higher and the happening probability of the disasters such as coal wall rib spalling,roof falling or the instability of support will be *** research findings have been testified in field application in No.15104 working face,which can provide a new approach for researching the interaction relationship of support and surrounding rock.

关键词： FMMLMH Support-surrounding rock system SD model Disaster control Simulation analysis

Overburden fracture evolution laws and water-controlling technologies in mining very thick coal seam under water-rich roof

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International Journal of Mining Science and Technology 2013年第5期23卷 693-700页

作者： Zhang Youxi tu shihao Bai Qingsheng Li Jianjun School of Mines Key Laboratory of Deep Coal ResourceMinistry of Education of ChinaChina University of Mining & Technology Datong Coal Mine Group Co.Ltd.

Considering the danger of water inrush in mining very thick coal seam under water-rich roof in Majialiang Coal Mine,the universal discrete element(UDEC)software was used to simulate the overburden fracture evolution laws when mining 4#coal ***,this study researched on the influence of face advancing length,speed and mining height on the height of the water flowing fractured zones(HWFFZ),and analyzed the correlation of face advancing length and change rules of aquifer water levels and goaf water *** on those mentioned above,this research proposed the following water-controlling technologies:draining the roof water before mining,draining goaf water,reasonable advancing speed and mining *** water-controlling technologies were successfully used in the feld,thus ensured safely mining the very thick coal seam under water-rich roof.

关键词： Water-rich roof Very thick coal seam Mining induced fracture Evolution law Water-controlling technology

Mechanics of rib spalling of high coal walls under fully-mechanized mining

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Mining Science and Technology 2011年第1期21卷 129-133页

作者： Yuan Yong tu shihao Wu Qi Ma Xiaotao tu Hongsheng Sun Lulu State Key Laboratory of Coal Resources and Safety Mining. China University of Mining ＆ Technology Xuzhou 221008 China School oy Mines Chino University of Mining ＆ Technology. Xuzhou 221116 China

In order to solve the problem of rib spalling of high coal walls in fully-mechanized（HCWFM）mines,we used the principle of damage mechanics to analyze coal wall rib *** results show that coal wall rib spalling is,to a certain degree,a macro-performance of the development of *** built a mechanical model to simulate the damage to the front of coal walls,carried out theoretical calculations of the damage parameters,analyzed the effect of mining height,original cracks,seam strength,horizontal stress,vertical displacement of the coal walls and other parameters on coal wall rib spalling, which conform well with the results of our field measurements and numerical *** key to control coal wall rib spalling is to control the development of cracks in coal *** the speed of advancing the working face,improving the setting load of support and the horizontal force of the guard board,strengthening coal walls and other technical measures can effectively reduce the degree of damage to the coal walls and control coal wall rib spalling at HCWFM faces.

关键词： HCWFM Rib spa/ling Damage mechanics Control technology