Abstract:To solve the problem of efficient mining of the end slope of an open-pit mine,taking the east slope of Yuanbaoshan Open-pit Coal Mine as the engineering background,combining the relative stability theory of slope and numerical simulation technology,the article analyzes the potential landslide mode,current situation and the stability of the original design slope of the east slope,optimizes the parameters of the east slope to the boundary,and proposes a reasonable compression plan,and finally determines the tracking distance between the internal dump and the working slope.The research shows that the potential landslide modes of the east slope of the stope are the shear-bedding sliding with the arc as the slope interface the weak bed as the bottom interface,and the shear-bedding sliding with the fault as the slope interface,and the weak bed as the bottom interface.The width of the flat plate at the end of the east slope of the stope to the coal bottom of the boundary slope 6 is 30 m,which is 5° higher than the current slope angle and 1° higher than the original design.The slope stability can meet the design threshold by controlling the tracking distance between the horizontal mining working slope and the internal dump within 50 m.This scheme can realize the safe and efficient mining of east slope resources and solve the problem of production continuity caused by the lag of the river improvement project.

Abstract:In view of the problems of discontinuous stripping production,high transportation cost,great influence of natural factors such as rain and snow,and low construction efficiency in most open-pit coal mines adopting excavator+mining truck process form topsoil stripping,the design concept of a fully continuous stripping and transferring system for open-pit coal mines is proposed.Through the topsoil stripping device,transfer device and soil discharge device,the fully continuous stripping and transferring system is built to realize the fully continuous stripping,transfer and discharge of topsoil.The design key points and working principle of topsoil stripping device,transfer device and discharge device are analyzed,and the application method of the system is described in detail.

Abstract:In order to solve the fault problems in the daily maintenance process of 4100XPC electric shovel switching system in Pingshuo Open-pit Mine,the article analyzes the control mode,operation principle and working characteristics of the electric shovel switching system.Through the analysis and description of common faults of the switching system,the article presents the corresponding troubleshooting methods.The results show that the cooling and dust removal effect of adding filter system is remarkable,which extends the service life of the armature contactor,reduces the electrical failure,and improves the equipment availability.

Abstract:In order to solve the problems of low reliability of 2800XPB shovel open bucket motor,such as non-self-winding and short service cycle of wire rope,combining the open bucket action and the working principle of electrical control system,the article analyzes the manifestations of actual faults on site,and upgrades and transforms the original open bucket device from high efficiency of bucket opening,low failure rate,maintenance free operation process,and problem of tangled steel wire ropes.The results show that the operation smoothness,wire rope life,energy consumption and failure rate of the modified open bucket system have been significantly improved,which not only improves the reliability and operation efficiency of the equipment,but also provides a strong guarantee for the smooth progress of mine production.

Abstract:In order to solve the problems of low control accuracy,difficulty in purchasing simulation plug-in boards,and difficulty in troubleshooting in the current 2800XPB electric shovel simulation electrical control system,we optimizes and transform 2800XPB electric shovel simulation electrical control system,analyze the advantages and expected effects of transforming the electric shovel control system into a digital DC speed control system,and introduce the objectives,tasks and innovative points of the optimization transformation.The operational effects show that the optimized control system responds more promptly and accurately,achieving precise dynamic control of the motor,effectively reducing electrical failures and lowering equipment maintenance costs.

Abstract:In order to improve the efficiency of outsourcing construction management of open-pit mine capital construction and build the efficient coordination mechanism,this article analyzes the problems and challenges,information asymmetry,poor communication and coordination,and unreasonable resource allocation in the management of construction outsourcing.The results show that the introduction of information management system,strengthen cross-departmental cooperation,optimize the allocation of resources and establish a clear division of responsibility and performance evaluation system,which can significantly improve the efficiency of construction management,promote information sharing and cooperation among the participants,reduce communication costs,reduce the waste of resources and ultimately achieve the goal of project completion on time.

Abstract:In order to accelerate the application of UAV LiDAR measurement technology in open-pit mines,taking Yunnan Xiaolongtan mine area as test area,the article adopts the DJI M350RTK equipped with GS-260X LiDAR system to comprehensively verify the reliability of the technology through equipment parameter compliance analysis,point comparison measurement,multi model stripping volume calculation(section method/model superposition method)accuracy,and repeatability testing of different sorties,systematically verifies the accuracy and applicability of unmanned aerial vehicle LiDAR measurement technology.The results show that the experimental equipment parameters,point accuracy,and volume acceptance results are all better than the standard specifications,and the operational efficiency has been greatly improved,meeting the actual needs of open-pit mines and the direction of intelligent development.

Abstract:In order to solve the current issues of weak data analysis capabilities and low efficiency in the initial and intermediate stages of intelligent open-pit coal mine,this article analyzes the status of intelligent construction in large,medium and small open-pit coal mines in Inner Mongolia,Shanxi,Xinjiang and other regions,concludes that open-pit coal mines need to advance to the high-level intelligent stage and proposes a comprehensive collaborative framework for high-level intelligent open-pit coal mines.Based on this framework,the article gives six specific measures for high-level intelligent construction:precise slope landslide early warning,intelligent mining design auxiliary decision-making,real-time ecological monitoring via aerial,space,and ground-based systems,integration and application of new productive forces,digital twin simulation for auxiliary decision-making,and unmanned mining operations,also identifies the development path for high-level intelligent open-pit coal mine,encompassing breakthroughs in foundational theories,cultivation of interdisciplinary talent teams,promotion of technological innovation,and enhanced research on key core technologies.High-level intelligent construction in open-pit coal mine is a systematic project,which provides a developmental direction for the next phase of China's open-pit coal minies.

Abstract:In order to quickly solve the problems such as road transportation interruption and threat to the safety of operation equipment and personnel caused by the collapse and instability of the open-pit end slope,taking the local collapse of the east end slope in Antaibao Open-pit Mine as an example,the article constructs a typical slope engineering geological model of the study area,and studies the typical failure and instability model of the end slope rock slope by combining numerical simulation and limit equilibrium analysis,evaluatesand predicts the stability of slope.From the technical and economic aspects,the article compares and analyzes control effects and advantages and disadvantages of the measures such as slope cutting and load reduction,main road reconstruction and monitoring and inspection,and puts forward the rapid response measures combining"main road reconstruction"and"monitoring and inspection"to ensure open-pit mine safe and efficient production.

Abstract:In order to study the influence of rainfall infiltration on the stability of loess slopes in open-pit coal mines,based on existing geological data,survey results,limit equilibrium theory and numerical simulation research methods,the article carries out stability calculation and analysis of loess slopes under multiple factors.By using Seep/W module to simulate the slope after rainfall infiltration,the article studies the distribution of pore water pressure inside the slope after rainfall infiltration,reveals the deformation and failure law of loess slope.The results show that the overall pore water pressure is highest in the upper loess layer,mainly due to the fact that the loess layer is a water conducting layer.After rainfall infiltration into the slope,the internal porosity is not dense,and surface water gradually flows down through the internal pores.The infiltration line gradually increases,and the overall stability of the upper slope decreases,leading to a decrease in the overall stability of the slope and easy occurrence of overall sliding.

Abstract:Taking the raw rock working face of Xinjiang Dananhu No.2 Mine as the research object,the article adopts FLUENT 19.2 software to establish the three-dimensional flow field model of water injection and pre-wetting in the open-pit coal mine working face,and analyzes the effects of water injection composition,water injection flow rate and water injection pressure on the water injection and pre-wetting effect in the open-pit coal mine working face,and designs the validation test for raw rock dust the water injection and pre-wetting.The results show that the effect of dust suppressant solution water injection pre-wetting is better than that of water injection pre-wetting only;the optimal water injection flow rate is 6 m/s and the optimal water injection pressure is 4 MPa,respectively;and the results of water injection pre-wetting validation test of the raw rock dust coincide with the numerical simulation results.The study provides a theoretical basis for the realization of dust suppression by water injection and pre-wetting of raw rock in the working face of open-pit coal mines.

Abstract:In order to improve the precision and collection efficiency of mine terrain data,based on UAV photogrammetry technology,this article explores the methods for terrain data acquisition and precision optimization in Baiyinhua No.1 Open-pit Coal Mine of Inner Mongolia.By establishing appropriate control points,planning flight routes and adjusting data processing parameters,the article adopts aerial triangulation densification and point cloud data precision analysis to improve data collection precision.The results show that the proposed systematic error compensation method and image data processing parameters optimized scheme effectively enhance the accuracy and reliability of mine terrain data,providing precise data support for earthwork calculations and engineering construction in mining projects.

Abstract:Based on the current situation of slope deformation and instability restricting the mining and safety stability in Beipingba dump of Xiaolongtan Open-pit Mines,the article studies the slope deformation mechanism of Beipingba dump and proposes the measures such as groundwater drainage and flood control ditch relocation to control the slope deformation.The results show that the adopted governance measures slow down the deformation rate of the slope,the groundwater level is reasonably controlled,the regional surface displacement rate is significantly reduced,the blind ditch inflow increases and tendsto stabilize,and the slope stability coefficient increases from 1.008 to 1.497,slople improvement from unstable state to stable state.

Abstract:To address the harmful effects and defects in traditional blasting methods for open-pit mining,the article presents gas-explosive combined blasting technology,monitors and analyzes the effect of blasting vibrations and characteristic of energy distribution.The results indicate that the vibration frequency of gas-explosion combined detonation is mainly in the mid low frequency range,and the vibration frequency shows the characteristics of fast high-frequency attenuation and relatively stable low-frequency during propagation.The duration of gas rock breaking energy is about one-third of that of explosive blasting,and the energy attenuation is stronger compared to explosive blasting.The combined detonation technology can save 3%to 11%of explosives,increase shoveling efficiency by 5.3%,reduce crushing energy consumption by 4.5%,and improve overall efficiency by an average of 5%,resulting in significant economic benefits.When conditions permit,the detonation method of"first rupture,then explosion"should be adopted as much as possible to reduce secondary disasters caused by blasting and achieve green,safe,and efficient construction.

Abstract:To study the dynamic identification rules of the starting point of landslide acceleration under different time windows,based on the characteristics of the uniform deformation stage in the three-stage creep deformation theory,the hypothesis testing method was applied to dynamically identify the critical moment point between the uniform stage and the acceleration stage.The influence of different time windows on the identification of the starting point of acceleration deformation was investigated.Combined with the case of landslide early warning,the effect of the identified acceleration moment point on the prediction of landslide time using the reciprocal of speed model was discussed.The results show that the hypothesis testing method can effectively determine the critical moment point between the uniform and acceleration stages of creep deformation.Different time windows have certain adaptability to the identification of the starting point of acceleration,and a larger time window cannot obtain an effective starting point of acceleration.When applying the landslide prediction model to predict the landslide time,the data after the acceleration moment point determined by using a smaller time window is more accurate for prediction.

Abstract:To address the critical issues during the transition period of Heishan Open-pit Coal Mine,including insufficient external dump capacity,urgent internal dumping demand,unbalanced release rates,and extended transportation distances,we conduct a comprehensive comparison between potential dumping spaces and transportation system distances,present solutions including the prioritized eastern-slope mining combined with reverse internal dumping,transportation system optimization by retaining Line No.2 and backfilling Line No.3,and a prioritized boundary expansion scheme for the southern external dump.The results demonstrate that the total capacity of the reverse internal dump reaches 25 876.97×104 m3,retaining Line No.2 and backfilling Line No.3 can release an additional 7 418×104 m3 of external dumping capacity.The prioritized boundary expansion scheme for the southern external dump effectively minimizes land occupation for external disposal.

Abstract:In order to improve the safety management level of outsourced contractors in Heishan Open-pit Mine,this article analyzes the prominent problems and causes of outsourced contractors safety management,and puts forward the corresponding improvement measures.There are deficiencies in safety education and training,responsibility implementation,site management and safety input of outsourcing contractors,leading to frequent accidents.By strengthening safety education and training,improving safety production responsibility system,strengthening on-site safety management,increasing safety investment and optimizing supervision mechanism,it can not only improve the safety management level of outsourcing contractors,but also provide a strong guarantee for mine safety production and effectively reduce accident risks.

Abstract:In response to the issues of damage to the rubber rollers of the rope protection frame,breakage of anchor bolts,and frequent damage to the scoop rod due to high-speed movement in 2800XPB electric shovel,this article proposes new type large rope protection frame,analyzes the advantages of the modified rope protection frame,and tests the modified rope protection frame on the machine.The article conducts the statistical and comparative analysis of the downtime caused by the failure of the rope protection frame before and after the renovation.The results show that the redesigned rope protection frame reduces failure time,decreases maintenance costs and spare parts usage expenses,enhances safety production,promotes waste utilization,and mitigates environmental pollution.

Abstract:To address the complex geological conditions of irregular permafrost layer and rock concretions in the full continuous process system,as well as the safety threats to the conveyor belt posed by the top of the non-working slope,the article presents a"five-step method"and an inverted"H"-shaped excavation method,which effectively solve the production challenges brought by special geological structures.Meanwhile,"three-step"approach combining technical prevention,personnel prevention and special supervision has been implemented to systematically enhance the safety of the conveyor belt transportation system.The research results show that these methods have successfully resolved practical issues related to permafrost layer,rock concretions,and frozen slope tops,and have laid a solid foundation for the stable succession of the subsequent mining field's"two quantities"(ore reserves and production capacity).

Abstract:In order to reduce the waste hole rate of drilling rigs,save operating costs,improve the blasting rate per meter,and optimize the overall technical and economic effects of drilling and blasting projects,the production technicians of East Open-pit Mine sort out the reasons for the high waste hole rate and collapse during drilling operations,summarize the root cause of the high waste hole rate,and successfully solve the technical problems of high waste hole rate,low blasting rate,and low cost and efficiency of drilling and blasting projects by optimizing the drainage system,changing the excavation and depth reduction process,refining process connections,implementing management measures and other engineering,process and management methods.