Abstract:In order to solve the deformation problem of the internal dump in an open-pit mine,this article takes the internal dump in Dadang Shengli East No.2 Open-pit Coal Mine as the research background,based on the theory of rigid body limit equilibrium,analyzes the slope stability of the internal dump,and takes the corresponding measures aiming at the existing risks,and verifies the slope stability under different foot pressing distances.The research results show that when the local status slope of+888-＋918 m platform in the internal dump reaches a toe depth of 40 m,the stability coefficient of the slope is 1.293,which meets the safety reserve coefficient and the slope is in a stable state.

Abstract:In order to elucidate the deformation and failure mechanism of the north slope in Xiaolongtan Open-pit Mine and the influencing factors,this article conducts stability analysis and prevention measures research on three typical profiles through on-site engineering geological investigation.The research results indicate that the north slope is in the early stage of weak deformation of the landslide and belongs to a potential large-scale translational landslide.The stability coefficient of the profile ranges from 1.041～1.085,and the overall state is under stable to basically stable.Further research has found that the stability of slopes is influenced by multiple factors such as topography,soil properties,and geological structures.Among them,surface water infiltration and groundwater seepage are the key factors that induce slope deformation.A treatment plan is proposed for blind ditch+precipitation,pressure reducing funnel measures(dewatering wells),slope cutting and load reduction of 2.1 million m3,and supporting"soil ditch+anti-seepage membrane"waterproof and drainage system.After calculation and verification,the minimum stability coefficient of the slope is increased to 1.159 under natural conditions and remain at 1.059 under earthquake conditions.

Abstract:An efficient and reasonable truck transportation scheduling plan is the key way to achieve the dual goals of saving cost and improving efficiency of mining enterprises.The existing truck scheduling research in open-pit mines is difficult to apply to the actual mine production guidance because of the lack of consideration of uncertain factors.A driverless truck scheduling model for open-pit mining is proposed,and the chance constrained goal programming method is used to balance the risks caused by the uncertainties in the solution of the scheme.The scheduling model is verified by an example,and on the basis of fully considering the uncertainties of the truck carrying capacity,the optimization strategy significantly promotes the improvement of mine transportation efficiency,not only realize the optimal reduction of transportation cost,but also significantly shorten the waiting time of trucks,and effectively reduce the overall deviation of ore grade between each unloading point,thus comprehensively optimizing the comprehensive benefit of mine production.

Abstract:In order to enhance the stability and fault handling efficiency of SF33900 dump truck's electric drive control system,this article investigates the magnetic field instantaneous overcurrent issue in the GE system's main generator,analyzes the phenomenological characteristics,operational impacts and technical causes of excitation overcurrent,and proposes a comprehensive solution integrating hardware inspection,system commissioning and preventive maintenance.The results show that adopting a"step-by-step detection+dynamic commissioning"strategy significantly improves fault handling efficiency,periodic maintenance and intelligent upgrades effectively reduce the annual failure rate,which provide technical reference for fault management of similar equipment.

Abstract:In order to clarify the characteristics of soil bulk density changes in reclaimed areas and the response to reclamation time and methods,Pingshuo Open-pit Mine reclamation flat plate is taken as the research object.A combination of field sampling and indoor analysis is used to analyze the effects of different reclamation years and land use methods on soil bulk density numerical changes.The results show that the bulk density of the reclaimed flat soil ranged from 1.21 to 2.01 g/cm3,with an average of 1.58±0.17 g/cm3.As the depth of the soil layer increases,the soil bulk density shows a trend of first increasing and then decreasing.The soil bulk density decreases with the increase of reclamation time,and the soil bulk density after more than 20 years of reclamation is significantly lower than that of other reclamation periods(P＜0.05).The soil bulk density of forest land is lower than that of cultivated land and grassland in all soil layers,while cultivated land only has a lower surface bulk density than grassland,and the soil layers of 20～60 cm and 60～100 cm are higher than grassland.There is an interaction between the reclamation period and land use mode.As the reclamation period increases,the soil bulk density of cultivated land increases,while the soil bulk density of forest land and grassland shows a trend of first increasing and then decreasing.Therefore,based on long-term reclamation results,forest and grassland reclamation have better effects.The research results can provide data support for soil improvement,soil quality improvement,and rational utilization of land resources in reclaimed land in mining areas,which also provide scientific basis for the implementation of land reclamation models and ecological reconstruction measures in mining areas.

Abstract:In order to study the evolution law of stress displacement of high and steep rock slope during excavation and unloading,FLAC3D software is used to analyze the stress displacement state of the slope,and the influence law of excavation depth and slope angle on the stress field,displacement field and stability of the slope during excavation is explored.The results show that the curvature radius of horizontal stress decreases with the increase of excavation depth,forming a"wedge"stress structure in the slope,and the peak horizontal stress decreases with the increase of excavation depth.The displacement increases with the increase of excavation depth,and the vertical displacement presents an arc spreading trend from the bottom plate to the bottom,and gradually evolves into a circular arc sliding trend with the continuous increase of excavation depth.With the increase of slope angle,the total displacement curve of slope body can be divided into three stages:steep increase in the early stage,slow increase in the middle stage and gentle development in the late stage.The stability coefficient of slope decreases with the increase of slope angle and excavation depth,and the potential failure mode is circular sliding failure.

Abstract:In order to solve the problem of direct aiming and loading truck of open-pit mine wheel bucket truck semi continuous process,the coordinate conversion among four coordinate systems of CCD(charge coupled device)imaging and the corresponding relationship between real position points and image position points are analyzed.A guide is placed at the wheel bucket discharge arm,and according to the principle of the projector,the vehicle is driven to the set position based on the image projected onto the ground by the guide to locate the loading area.The upper end of the bucket discharge arm is equipped with dual CCD cameras.Based on the principle of dual CCD positioning,the truck bucket is determined to be located in the spatial position of the bucket excavator coordinate system.The dual positioning points of the truck are aligned with the image calibration points to achieve intelligent alignment and loading of the bucket excavator.Taking Hami No.1 Mine as an example,empirical research is conducted,and the results show that the dual positioning points of trucks can achieve aiming and loading when the world coordinates of the wheel excavator coordinate system are x1w=-3.19 m、y1w=0 m、z1w=3.82 m,x2w=2.59 m、y2w=0 m、z2w=3.82 m,and coordinates of coordinate system are u1=53、v1=246,u2=506、v2=246.

Abstract:In order to solve many practical problems on site,such as the serious shortage of station staff in recent years,the urgent need to update some signal equipment,and the high efficiency of manual intervention in train operation organization,Fushun East Open-pit Mine carries out microcomputer interlocking upgrade and renovation work in conjunction with the existing station overhaul.In the renovation,combined with the highly dispersed and centralized command of train operation organization characteristics of the station,a regional centralized control center for the internal waste dump is tentatively established and achieved complete success.The construction of the centralized control center not only optimizes the transportation system,reduces personnel,improves efficiency and ensures safety,but also realizes a new mode of train operation organization for unmanned remote centralized control of subordinate stations,which lays a solid foundation for the subsequent optimization of centralized control at the east pit and west pit stations,and ultimately interconnection with the ministry of transport,forming the overall integration of the electric railway transportation system.

Abstract:In order to master the slope deformation law of grand stand area in the east slope of Wucaiwan No.1 Open-pit Coal Mine,based on the geological section of the slope engineering,the numerical calculation model of the slope is established,and the displacement deformation law is analyzed by FLAC3D software.Combined with the displacement data of two monitoring points,the latent sliding mode and deformation characteristics of the slope are comprehensively analyzed.The results show that the failure mode of the slope is the bedding sliding failure mode along the coal seam floor.The local deformation area is formed at the dumping step and the original rock step,and the abandoned material resists the deformation of the original rock step.Displacement monitoring shows that the slope has an overall horizontal displacement trend to the free surface,and the discarded materials are in the stage of constant settlement.The deformation law of numerical simulation is consistent with the research results of monitoring deformation.

Abstract:To address the progressive instability of soft rock dump slopes in open-pit coal mines under multi-factor coupling(self-weight,rainfall,blasting vibration,freeze-thaw),take the south external dump of Zahanao'er Open-pit Coal Mine as a case,based on rigid body limit equilibrium methods,FLAC3D finite difference method,and particle discrete element method,the slope failure mechanism and stability coefficient are systematically revealed.The results show that the slope exhibits dual failure modes—subsidence-sliding failure along quaternary weak layers and circular shear failure in dumped material zones.Under extreme conditions,the comprehensive safety factor is 1.20～1.25,meeting the long-term stability criteria for external dumps specified in relevant codes.Discrete element dynamic simulation predicts a maximum sliding distance of 4.3 m,volume of 9 690 m3,and velocity of 0.4～0.7 m/s,posing no impact on surrounding structures.The outcomes provide an accurate basis for safety assessments of structures near dump sites and serve as a reference for stability evaluation of external dumps and construction planning in similar mines.

Abstract:Based on the development status of open-pit coal mines in China, this article summarizes the development achievements of open-pit coal mines in terms of mining theory, mining technology, mining equipment, production safety, environment protection, comprehensive utilization of resources and informatization.Under the overall goal of green, safe and efficient open-pit coal mine construction in the new era, this article puts forward the specific methods to realize the goal from three aspects of technology, equipment and management, and scientifically grasps and predicts the future development tendency of the open-pit coal mines in terms of mining technology, equipment and management, so as to further promote the scientific development of coal industry.