In order to solve the outstanding problems in the management of stripping contractors in open-pit coal mines,through analyzing the current situation of contractor management in the domestic mining industry,the article proposes a"14212"systematic management model,abandoning the past all-passive management and forming an active+passive two-way management method.The results show that by improving the management system,standardizing the implementation of responsibilities and eliminating management loopholes,we can weaken a series of problems caused by high turnover of personnel from stripping contractors,low cultural level and disordered management and greatly reduce the difficulty of management.At the same time,we eliminate the phenomenon of prevarication and wrangling existing in the management and stripping of contractors by functional departments and teams at the mine level,strengthen the supervision and control of contractors,and ensure the safe production of open-pit mines.
Taking west slope soft rock slope of Buzhaoba Open-pit Mine as the research object,combined with the relevant geological data,a three-dimensional model was established,and the strength reduction method was used to study the local step slip mechanism of west slope soft rock slope of the Buzhaoba Open-pit Mine using FLAC3D software.According to the comparative analysis of the monitoring data and rainfall data before the landslide,the cause of the deformation was further clarified.At the same time,the basic process of deformation and disposal of soft rock slope in the west slope of the open-pit mine is introduced.The results show that rainfall is the main inducing factor of the slope deformation,the deformation is mainly located in the shallow layer of the slope free surface,the stress distribution is basically parallel to the slope surface,and the tensile stress and compressive stress are concentrated at the top and foot of the slope respectively,which is a push-type deformation and is consistent with the actual deformation characteristics of trailing edge settlement and leading edge uplift.
This article briefly elaborates the information systems and application status of the coal production business of Zhunneng Group,describes the construction of the production data standardization system and the production data real-time database platform,and uses big data analysis technology to realize the comprehensive statistical analysis of the coal production business data,production real-time monitoring data,and the centralized storage,management and display of the business data,fundamentally solving the problems of overlapping and mixing of information system business,uneven standards,independent data and weak decision-making support capabilities.The results show that through the construction and application of this platform,intelligence can effectively guide production operations,which provide reliable support for decision-makers to accurately issue instructions,and provide a foundation for the intelligent construction and high-quality development of enterprises.
Aiming at the problems of inclined basement dumping and dump stability,based on the engineering background of 15～17°basement in the north slope of Heishan Open-pit Coal Mine,the article carries out the research on the dumping scheme and stability.The article analyzes deformation characteristics and sliding mode of inclined base dumping,carries out analysis and research on 15 m single-bench dumping,combined-bench dumping and optimal dumping angle of inclined basement.According to the width of the transportation road and the storage capacity of the dumping,the optimal dumping scheme is selected.The results show that the width of the combined steps is more than 20 m,and the dumping steps do not affect each other;the slope angle is less than 21°,and the overall stability of the slope is greater than 1.3.Finally,the scheme combination step distance is 20 m and the slope angle is 20.2°.
The article discusses the ecological monitoring indicators and methods for open-pit coal mines from three aspects:soil parameters,meteorological and hydrological parameters and vegetation parameters,introduces the overall architecture of the intelligent ecological data management platform for open-pit coal mines,and elaborates the functions and key technologies of four modules:data collection,data storage,data analysis,and decision support.The article presents the intelligent ecological monitoring solution for open-pit coal mines has been proposed based on manual monitoring and an intelligent ecological data management platform for open-pit coal mines,forming an intelligent ecological maintenance platform for open-pit coal mines.
In order to timely judge and control the hydraulic and transmission system faults of D11T crawler bulldozer in Heidaigou Open-pit Coal Mine,avoid long-term downtime caused by the faults,and affect equipment operation,through studying the hydraulic and transmission system principles of D11T crawler bulldozer,the article analyzes the causes of hydraulic and transmission faults,proposes solutions and preventive methods for the faults.The results show that through fault analysis and fault prevention practices,the failure rate and failure time of D11T equipment in Heidaigou Open-pit Mine have been greatly reduced,which provide effective guarantee for safe production in the mine.
Aiming at the existing problems of unmanned driving communication systems in open-pit mines,in order to ensure the stability of the communication system,the article proposes a network application method that adopts dual network coverage in the main and backup modes.Based on dual link communication,the article introduces the selection of backup communication links for unmanned communication networks in mines,as well as the dual link communication architecture and dual link switching method.The practical application of Tianchi Energy South Open-pit Coal Mine shows that dual link hot backup communication can effectively solve the interruption of unmanned driving business caused by a single network fault,and the application effect is good.
In order to study the influence of different section forms of the open-pit mine slope on the slope stability,taking the south slope of Heishan Open-pit Mine as an example,based on the optimization method theory of the simplified Bishop method and the numerical simulation study of the strength reduction method,the article analyzes numerical variation relationship between the anti sliding force and the sliding force of the slope under different section shapes,explores the stability relationship of the slope under different section shapes,and proposes the slope section shape optimization method.The results show that there is a bottom dip angle θ,the slope is divided into"anti sliding section"and"sliding section".When the difference of slope section form is mainly distributed in the sliding section,it is not conducive to the slope stability.When the difference of slope section shape is mainly distributed in the anti sliding section,it is conducive to the slope stability.
In order to further research on the deformation failure mechanism and stability of slope along volcanic rock mines in the southeast region of Zhejiang Province,the article takes a slope on an island in Wenzhou City,Zhejiang Province as an example.Based on a comprehensive investigation of the structural characteristics and deformation-destruction characteristics of the slope rock mass,combined with the results of deformation monitoring,the article analyzes deformation-destruction mechanism of this type of slope,and carries out numerical simulation verification using 3DEC discrete element program.The results show that the deformation failure of rock slope is mainly controlled by its own structure and regional main discontinuities output state.The cracks intersecting with the large angle of the slope evolve into deformation side boundaries,while those intersecting with small angles or tending to outside of the slope or their combinations evolve into deformation bottom boundaries.The protruding parts of the slope are weak areas in terms of stability,so plane linear changes should be minimized in mine slope design to enhance overall stability.
In order to improve the work efficiency of electric shovels and ensure safe and efficient production in open-pit mines,the article analyzes the shortcomings of three commonly used methods for moving the tail line cables of electric shovels in major open-pit mines,and proposes to use the tail line cable retractable vehicle to cooperate with the electric shovel for walking and transferring,while also retracting and releasing cables.The article introduces walking,platform,machine room,safety fence,retraction and release device,electric control system of the tail line cable retractable vehicle of electric shovels,the distance detection anti dragging device and cable support frame,as well as eight main components.The results show that through on-site practice,the retractable vehicle is reasonable in coordination with the electric shovel,improving the production efficiency of open-pit mines,avoiding damage caused by cable dragging on the ground and causing safety accidents,reducing manual auxiliary layout and cable movement processes,and saving manpower and material resources.
In order to solve the problem of slope shape optimization of external dump in open-pit coal mine,based on the theory of horizontal shape optimization,the article puts forward a method of slope shape optimization of external dump.Taking the external dump slope of open-pit mine of Thar Coalfield Block II as the engineering background,the article analyzes the stability of each slope of the original designed dump using rigid body limit equilibrium method and numerical simulation technology,and optimizes the shape of each slope.The article analyzes the economic benefits brought by the shape optimization of the external dump.The results show that the width of the horizontal design plate of each slope of the external dump is 25 m and the width of the horizontal design is 20 m.The external dump of the new design parameters can hold more 9.16 Mm3 than the original design parameters,which can maximize the holding capacity of the dump on the premise of ensuring safety.
Taking the floor water of 9-1 coal seam in Shitoumei No.1 Open-pit Coal Mine of Santanghu as the research object,based on the occurrence status,hydraulic connection,water inflow pattern,hydrochemical type,sudden inflow characteristics and rock mechanics characteristics of coal seam floor water,the article analyzes the internal impact of coal seam floor water on coal seam mining,elaborates the hazards of coal seam floor water production,classifies and evaluates the hazards of coal seam floor water,which provide a certain basis for the prevention and control of water hazards in open-pit mining areas.
In order to improve the stability of the south slope of the stope in Shitoumei Open-pit Coal Mine,based on the analysis of the exploration data,field survey and slope monitoring data of the south slope of the stope,the article discusses the influencing factors and treatment measures of the south slope instability.The results show that optimizing the slope angle is the key to improve the stability of the slope.By taking the measures such as cutting the slope at the upper part of the slope to reduce the load,discharging the presser foot at the lower part,reducing the slope angle,and reducing the dynamic load,the stability of the south slope of the stope can be effectively improved,the hidden danger of the landslide of the south slope of the stope can be eliminated,and the safe production of the coal mine can be guaranteed.
In order to study the slope stability under the influence of weak layers in soft rock slopes,and establish a slope model containing weak layers,the article uses limit equilibrium method and finite element method to simulate the slope stability under the influence of weak layers,and explores various evaluation indicators to comprehensively describe the slope stability state.The results show that through finite element method calculation,when the weak layer is retained,the slope stability coefficient is less than 1,and the slope model is connected by shear strain bands.The bottom of the weak layer is sheared out,and the upper part shows a sliding trend.The slope failure mode is a sliding shear type.After removing some weak layers,the stability coefficient of the slope is greater than 1.3,and the shear strain band does not extend through the entire slope model.Using the limit equilibrium method to calculate slope stability,the slip arc is basically consistent with the shear strain band of the finite element method,thus verifying the accuracy of the calculation model.
To meet the actual requirements of mine ecological restoration projects and achieve accurate and efficient investigations of restoration areas,this article takes the ecological restoration project of Fushun West Open-pit Mine as an exemple.Unmanned aerial vehicles(UAV)equipped with high-definition cameras are employed to collect aerial tilt images,while PIX4D software is utilized to construct three-dimensional models of the mine's ecological restoration areas.By assigning value to each collection spot within the ecological restoration area,the area of each block in the mine is accurately summarized,resulting in the identification of 16 distinct ecological restoration areas covering a total of 449 hectares.The results show that UAV tilt photography surveying and mapping technology has characteristics of high efficiency and convenience.The surveying and mapping results prove to be accurate and intuitive,effectively reducing the work intensity and playing a crucial role in the formulation of ecological restoration plans.
In order to study the fault deformation law under the combined action of mining disturbance and groundwater,this article uses FLAC3D to establish a numerical model of slope with faults.By setting different excavation depths and groundwater extraction depths,the article explores the change characteristics of fault and slope displacement field and seepage field under the coupling action of mining and seepage flow.The results show that with the increase of mining depth,the maximum displacement of fault in X direction gradually increases.The main failure mode of the fault is tension fracture.With the development of mining and extraction,the distribution form of stress concentration changes from scattered point to linear distribution.The fault develops from discontinuous failure to through failure.With the deepening of mining,the range of plastic zone increases gradually.Affected by mining and groundwater seepage,the stability of the slope gradually decreases.Under the condition of groundwater,the overall stability coefficient of the slope decreases by 1.34%.
With the production capacity of Yimin Open-pit Mine increased to 35.00 Mt/a,the mining equipment was upgraded again.In order to effectively reduce the number of stripping steps,reduce mining intensity and stope space in the future,and then reduce the annual stripping amount,Yimin Open-pit Mine conducted a study on the height of the steps.By comparing and analyzing the height of different steps within the range of mining height of electric shovel,the height of the steps is finally determined to be adjusted to 14 m.
Taking Ha'erwusu Open-pit Coal Mine as an example,this article analyzes the intelligent development status of Ha'erwusu Open-pit Coal Mine.We find that the tracking system needs to be improved in time,the level of system integration needs to be improved,the intelligent safety management needs to be optimized and improved,the intelligent supervision system needs to be strengthened,and so on.We innovatively adopt the method of combining investigation and interview.According to the construction requirements of tracking system,we improve system integration level,optimize the construction of intelligent safety management system,strengthen the composition of personnel,improve the level of intelligent system construction.The results show that the corresponding optimization and improvement suggestions supplement the intelligent construction system of Ha'erwusu Open-pit Coal Mine.The working direction and content of intelligent construction are clarified.
In order to find the best ventilation and dust removal system and improve the heat dissipation and dust removal effect of the electric shovel in the machine room,the article analyzes the ventilation and dust removal system of six types of electric shovel in Pingshuo open-pit mining area,and compares and analyzes the relevant parameters of various ventilation and dust removal systems.The results show that the filter drum ventilation and dust removal system has high filtration accuracy and filtration efficiency,significant heat dissipation and dust removal effect,and improves the environment of the electric shovel engine room,reduce electrical faults,extend the service life of electrical components,and reduce equipment maintenance costs.
Through analyzing the development condition of green mines in open-pit coal mines and the opportunities and challenges faced by coal mining enterprises under the dual-carbon target,this article systematically sorted out the ecological and environmental problems faced by the green mine construction of coal mining enterprises in the grassland of eastern Inner Mongolia.The article summarizes the achievements in the scientific development methods,efficient utilization of resources,management informatization,environmental ecology,and mining community harmony,and reveals the green development path and existing problems of coal enterprises under the dual-carbon target,and points out that the coal industry should actively respond to the mandatory carbon emission reduction policy and take precautions.
