Abstract:Based on the data of coal mine safety accidents in China in 2023,the characteristics of coal mine safety accidents were ana-lyzed from four aspects:accident types,time distribution,regional distribution,and accident causes.The results indicate that roof acci-dents are still the focus of various safety accidents in coal mines,and differentiated prevention and control strategies should be adopted to address the high frequency and low mortality rates of transportation and mechanical and electrical accidents,as well as the low fre-quency and high mortality rates of gas and fire accidents.The time distribution shows three high-risk periods:the resumption period at the beginning of the year,the high-temperature operation period,and the year-end sprint period.The regional distribution is more in the north and less in the south.Among them,Shanxi Province is affected by factors such as a large coal mine base,complex geological con-ditions,difficulties in intelligent transformation,and uneven technical equipment,resulting in a double high trend in the number of acci-dents and deaths.The direct causes of coal mine accidents in 2023 are concentrated in unsafe human behavior,unsafe conditions of ob-jects,and management deficiencies.It is necessary to establish a rigorous,refined,and intelligent dual prevention mechanism and control system to effectively control unsafe factors of people and objects,and ensure production safety from the source.

Abstract:The mining of steeply inclined coal seams is a major technical challenge in coal mining,especially in areas with complex geo-logical conditions.As an important coal producing country in Central Asia,Uzbekistan's coal mines generally have characteristics such as large coal seam dip angles and complex geological structures,which pose great challenges to coal mining.In recent years,with the in-creasing demand for coal and the deepening of mining,the problem of steeply inclined coal seam mining in Uzbekistan's coal mines has become increasingly prominent,and targeted technical research and application practice are urgently needed.In response to the technical challenges faced by the mining of steeply inclined coal seams in Uzbekistan's coal mines,taking Angren Coal Mine as the research object,based on the analysis of its geological characteristics and mining status,a technical scheme for steeply inclined coal seam mining applica-ble to the mine was proposed and applied in practice.The application results show that this technical solution effectively improves the ef-ficiency and safety of coal mining,providing reference and demonstration for coal mining under similar geological conditions.

Abstract:Regarding whether the Mengba Coal Mine can carry out four layer mining after three layer mining,in order to solve the problem of production continuity in the northern mining area where the development project is seriously lagging behind and cannot be put into pro-duction on schedule,numerical simulation methods were used to analyze and study the development height of water conducting fracture zones and the observation rules of surface rock movement.The successful implementation of the first four layered mining face in No.1412 working face has released a large amount of coal resources,extended the mining time in the central mining area,and ensured the sustain-able development of mine.The research results have positive significance for promoting the regional economic development of Bangladesh.

Abstract:The comprehensive information supervision platform for coal mines utilizes modern information technology to collect,organize,and analyze information data,achieving comprehensive functions such as on-site safety control,production scheduling and command,e-mergency rescue,and communication and liaison support.It achieves the digitization,intelligence,standardization,refinement,and stand-ardization of entire safety production system through the"five modernizations"system management.Taking a mine in Inner Mongolia as the research background,the construction of a comprehensive information supervision platform for coal mines was explored from three aspects:system composition,scheme design,and system functions.The platform aims to achieve comprehensive processing of business processing,data analysis,intelligent management,dynamic monitoring,and supervision,which will help promote the construction process of smart mines.

Abstract:A study was conducted on the dynamic effects and risk assessment of the potential risk of rock burst induced by the retained coal pillar area on the No.8301 working face of a certain mine.Taking the hard rock layer on the roof of working face as the research object,the energy release mechanism of initial rupture of shock source layer was analyzed based on the fixed beam model,and the ener-gy released by the rupture was obtained.Combined with microseismic data,the energy attenuation coefficient was calculated,and the re-sidual energy when the vibration wave propagated to the key position was obtained.By analyzing the energy consumption of the roadway support system,a kinetic potential energy balance model was constructed,and the critical peak velocity of the supporting system failure was determined.Research has shown that the existing supporting system theoretically has the ability to resist 5th power strong mining earthquakes,and has identified the risk of dynamic and static load coupling in the area due to the combination of"retained coal pillar static load concentration and hard roof dynamic load breakage".A comprehensive prevention and control measure of"monitoring and warning-strengthening supporting-stress regulation"has been proposed to ensure the safe mining of working face.

Abstract:In response to the requirements of the"Coal Mine Safety Regulations"for linkage control of dust reduction at the transfer point of the fully-mechanized tunneling machine,a dust reduction device with linkage and joint control based on air-water mixing atom-ization was designed for the poor dust reduction effect in A4303 return airway of a mine in Xinjiang.Through solenoid valve and pres-sure relay,it realizes synchronous control with the starting of fully-mechanized tunneling machine,and adopts air-water two-phase spray technology(compressed air mixed with water),which significantly improves the atomization effect and coal dust wetting ability.On-site application shows that the device reduces the dust production rate at the transfer point by 74％to 81％,and solves the problem of nozzle blockage by adding a water purification device.

Abstract:In response to the technical difficulties and challenges faced by Tianshan Mining Industry Company in promoting the con-struction of intelligent mines,such as communication barriers,remote precise control difficulties,and data transmission bottlenecks,5G communication technology was introduced,and its core characteristics,deployment architecture,key application scenarios,and AI video technology were analyzed.The application effect,innovation points,and development prospects of 5G in the construction of intelligent mines were sorted out in order to help promote the construction of intelligent mines.

Abstract:In response to the problems of freezing and cracking of mechanical ventilation towers in northern China,the antifreeze meas-ures of mechanical ventilation towers were studied and analyzed based on the engineering background of Jiangsu Energy Ulagai Power Plant.Analysis indicates that the main reasons for freezing are environmental,equipment,and operational factors.Targeted antifreeze measures and inspection systems have been proposed to reduce the risk of ice formation in the mechanical ventilation tower during win-ter,providing a guarantee for the safe and stable operation of the flue gas water extraction system.

Abstract:The Shilaosu Coal Mine in Inner Mongolia is covered with thick weakly cemented sandstone,and there is an abnormal subsid-ence pattern during mining.The subsidence rate(maximum subsidence/mining thickness)of the first mining face after mining is about 0.03,and the subsidence rate of the second mining face after mining has sharply increased to around 0.3.In order to study the evolution law of surface subsidence caused by high mining height in the southern mining area of Shilaosu Coal Mine,the No.1208 fully-mecha-nized mining face of Shilaosu Coal Mine was taken as the research object.Based on the measured data of surface subsidence,the move-ment and deformation law of surface subsidence caused by fully-mechanized mining and the predicted parameters of probability integra-tion method were obtained through data sorting,curve drawing,parameter calculation,and comprehensive analysis.The preliminary reve-lation of the evolution law and characteristics of surface subsidence under the geological mining conditions provides a scientific basis for the subsequent prediction and control of mining subsidence in the area.

Abstract:In the context of"dual carbon"target,the low-carbon transformation of thermal power industry,as the core area of carbon e-missions in China,is crucial.Taking the 700 MW supercritical circulating fluidized bed unit of a certain thermal power company as the research object,a systematic study was conducted from the management and technical paths to address the problems of incomplete car-bon emission statistical accounting system,extensive coal source control,and incomplete carbon asset management system.By introdu-cing multiple linear regression models to quantify influencing factors and combining innovative practices such as"high-level secondary air"technology and intelligent control systems,significant results have been achieved in reducing coal consumption and carbon emission intensity in power supply,providing reference and inspiration for low-carbon transformation of thermal power enterprises.

Abstract:Shuanglong Company uses ground directional drilling to explore and grout seal the fracture zone of coal seam roof along the boundary curtain line direction,and to explore and treat possible small coal mine out of bounds goaf areas,in order to form a curtain wall to block the old empty water from entering the Fangzhuang through the Daihe and Shitai mine field boundary coal pillar collapse water.Based on the prevention and control of secondary water hazards caused by the closure of Shuanglong Company's mine field boundary curtain grouting project,the design,construction technology,and grouting effect of ground curtain grouting project were analyzed.The in-fluencing factors of curtain grouting volume were studied through grey correlation method and multiple linear regression method.The re-sults indicate that the grouting material used is cement fly ash slurry,and its ratio meets the requirements of grouting treatment.

Abstract:In the process of coal resource mining,the excavation of"three soft"coal seams along the goaf faces a prominent contradic-tion between safety and resource recovery.The problems of easy deformation of surrounding rocks,instability of coal pillars,and high risk of water damage urgently need to be solved.To address these challenges,theoretical analysis and on-site measurement methods were comprehensively applied to determine that a coal pillar width of 6 meters is a reasonable choice.At the same time,a joint support-ing scheme of anchor rods and cables was proposed for surrounding rock control,and effective water exploration and drainage technical measures were developed.The research results not only improve the resource recovery rate and reduce the supporting cost,but also sig-nificantly enhance the safety and stability of roadway,providing a scientific and practical solution for gob-side entry driving of"three soft"coal seams.

Abstract:Mine water inrush is one of the main disasters in the production process of coal mines.The effluent from the 4th limestone aq-uifer on the floor of Zhangshuanglou Coal Mine is about 200 m3/h,accounting for 41％ of normal inflow of mine.Analyzing the geolog-ical structure and mining method of the mine,it was found that the shallow mining face and mining area can be treated with drainage and depressurization methods for the floor of 4th limestone aquifer.Further research is needed on the prevention and control of the floor of 4th limestone aquifer during deep coal resource mining.On this basis,research methods such as mathematical statistics,on-site and indoor testing,and vulnerability index method were used to analyze and evaluate the water yield and water inrush risk of 4th limestone aquifer,and on-site engineering verification of water yield and water inrush risk was carried out.The results show that the 4th limestone aquifer extend deeper with the level of mining,and the degree of karst development and water abundance gradually weaken.They are di-vided into medium rich water areas,weak rich water areas,and extremely weak rich water areas from shallow to deep,with obvious verti-cal and block characteristics.Using the vulnerability index method combined with the vertical zoning of karst,it is divided into three zones:the safe zone for water inrush from the floor(Iv≤0.15),the transitional zone for water inrush from the floor(0.10＜Iv ≤0.52),the relatively vulnerable zone for water inrush(0.52＜Iv ≤0.72),and the vulnerable zone for water inrush(Iv＞0.72).A comprehensive evaluation of the risk of water inrush in Taiyuan Formation's 4th limestone aquifer areas,and the implementation of geophysical and drilling field engineering verification of water richness and water inrush risk,can provide theoretical basis for water prevention and con-trol work in the mine.

Abstract:The traditional coal mine fire monitoring system mainly adopts the method of collecting gas samples underground and sending them to the surface,and a gas chromatography analyzer for component and concentration analysis.There are problems such as long anal-ysis cycle,long gas sample transportation distance,and difficult maintenance of gas pipelines.In response to this,a design scheme for a spontaneous combustion fire bundle tube monitoring and early warning system for underground coal mines based on the principle of micro chromatography analysis was proposed.Gas samples were taken from key areas such as goaf,working face,and high outburst area nearby,and sent it to the main station of the intrinsically safe fire monitoring system for mining for analysis of its composition and content.The a-nalysis results can be synchronously transmitted to the ground center station or underground display screen through the industrial Ether-net platform,providing scientific basis for coal mine fire monitoring and prevention work,and ensuring coal mine safety production.

Abstract:The problem of low oxygen in the fully-mechanized mining face of coal mines is serious and threatens production safety.Its causes involve the coupling effect of multiple factors and the dynamic evolution law of gas.Taking the No.34205 fully-mechanized working face in No.3 Underground Mine of China Coal Pingshuo Group as the research object,through the dynamic analysis of environ-mental parameters such as annual gas volume fraction monitoring(O2,CH4,CO,CO2)and temperature and humidity pressure,combined with four machine learning prediction models of support vector regression(SVR),random forest(RF),decision tree(DT)and gradient boosting(GB),the causes of low oxygen in the return corner were revealed and the prediction model was constructed.Research has shown that sudden drops in ground pressure and slow propulsion speed exacerbate low oxygen phenomena through the"breathing effect"of goaf and the oxidation of residual coal,respectively.The lowest O2 volume fraction during the morning shift is 17.58％;comparison of prediction models shows that the GB model has the best prediction performance(MSE=0.011 6,R2=0.936 4),with an error reduction of 86.57％ compared to SVR,and can accurately capture low oxygen dynamic fluctuations.The study provides a theoretical basis for low oxygen warning and management in coal mines through the analysis of gas dynamic evolution laws,low oxygen causation,and multi mod-el comprehensive prediction optimization.

Abstract:In the emergency response process of coal mine emergencies,there are situations where rescue personnel cannot directly enter the accident site.At this time,it is crucial to quickly and accurately analyze the operation status of mine ventilation system through re-mote means to assist the mine rescue team in making scientific decisions.To this end,by combining tracer gas technology and computa-tional fluid dynamics(CFD)modeling methods,specific tracer gases were released into the coal mine ventilation system,and CFD mod-els were used to numerically simulate the airflow flow inside the mine.Four ventilation failure scenarios were established to simulate dif-ferent degrees or types of ventilation system failures,and the model prediction results were compared and verified with field experimental datas to ensure the effectiveness and accuracy of model analysis.The experimental and model analysis results show that combining direct observation of tracer gas profiles with numerical simulation of CFD model can effectively identify the changing characteristics of mine ventilation systems,which helps to improve the response speed and decision-making quality of mine emergency rescue.

Abstract:Focusing on the technical challenges of unloading gas in the protective layer of close range coal seam group mining of Pan-jiang Clean Coal Co.,Ltd.,the technology of pressure relief gas extraction from adjacent layers by drilling through layers under pressure cutting was studied based on the analysis of development of mining induced fractures and gas flow patterns.By pre extracting gas from the protected layer before mining and efficiently extracting gas from adjacent layers to relieve pressure during mining,the main channel for the formation of separation layer cracks after mining was intercepted,effectively controlling the influx of gas from adjacent layers into the mining space.The application effect of pressure relief gas extraction technology in Shanjiaoshu Coal Mine is significant,which solves the problem of gas gushing from adjacent layers into the mining space of working face,ensures safety production,and has good applica-tion and promotion value.

Abstract:Under the fully-mechanized top coal caving mining method,in order to reduce the loss of coal resources and improve the top coal release rate,it is necessary to determine a reasonable coal caving technology.Taking the No.8 coal seam,which is the main mining area of a certain coal mine,as the engineering background,the PFC numerical simulation method was applied to analyze the top coal ca-ving under different coal caving technology conditions for its complex structure with interbedded gangue layers.Combined with actual production,the coal caving parameters were determined as a mining height of 2.5 meters and a coal caving step spacing of 1.2 meters,and the fully-mechanized top coal caving mining technology with multiple rounds of interval sequential coal caving was adopted.Appli-cation practice has shown that the fully-mechanized top coal caving technology under this condition is conducive to achieving safe and efficient production of working face.

Abstract:Based on the geological conditions of a mine in Shanxi Province,FLAC3D numerical simulation software was used to analyze the influence mechanism of parameters such as mining depth,weak structural planes,and surrounding rock strength on the evolution law of zonal disintegration in roadway.The simulation results show that a high stress environment is a necessary mechanical condition for the occurrence of zonal disintegration in surrounding rock of deep roadways.The development and spatial distribution characteristics of weak structural planes inside the surrounding rock play a key role in the formation of zonal disintegration.Changes in the strength parameters of surrounding rock have a significant impact on the expansion range and degree of damage of disintegration zone.The research results provide theoretical and data support for revealing the formation principle of zonal disintegration of surrounding rock in deep roadways.

Abstract:The No.5 mine in the western area of the Dananhu mining area in Hami contains high salinity mine water with a mineraliza-tion degree at about 16 g/L,and the processing and operation costs are high.In order to solve the shortage of water resources and a-chieve the maximum comprehensive utilization of mine water,ecological green space planting experiments were carried out to study the survival rate and growth trend of salt tolerant plants such as tamarisk,haloxylon ammodendron,nitraria tangutorum,and calligonum mon-golicum,and explore suitable irrigation methods.Experiments have shown that in high salinity environments,drip irrigation has a higher survival rate for seedlings than furrow irrigation.After 75 days of planting,the survival rate of nitraria tangutorum and calligonum mongo-licum was higher than 65％,and the growth of tamarisk,haloxylon ammodendron,nitraria tangut orum,and calligonum mongolicum was stable.Based on the experimental results,an ecological vegetation practice aimed at 100％ utilization of mine water has been carried out,successfully achieving vegetation restoration and planting in 1.47 km2 desert areas.This not only significantly reduces the cost of environmental governance,but also creates an ecological and economic value of about 1.1 million yuan/a,demonstrating good environ-mental and economic benefits.