Study on Surface Subsidence Regularity of Block Caving Mining Method Based on UAV Aerial Survey
The block caving method is known to result in a specific range of surface subsidence,which is a major safety risk in mining operations.UAV aerial survey technology offers numerous advantages,including enhanced safety,simple operation process and high precision in monitoring large and complex surface areas.Therefore,this study concentrates on the largest block caving mine in China,employing UAV aerial survey techniques to remotely monitor surface subsidence caused by block caving mining methods.The development of UAV aerial survey technology has led to the proposal of a 3D modeling method for surface subsidence based on UAV aerial survey.An accuracy analysis method for the 3D modeling process was also presented.By cons-tructing 3D models,analyzing the extent of surface subsidence affected areas,examining profile data of subsidence affected areas,and conducting theoretical analysis,this study investigates changes in the subsidence area of the mine from March 2022 to March 2023.Based on an analysis of the subsidence range and orebody profile within the vein,as well as predictions of surface subsidence using the probability integral method(PIM),it can be inferred that the extent of active subsidence is influenced by the distribution of active drawpoints.Furthermore,by utilizing PIM to forecast subsidence values,a comparison between the calculated and actual subsidence amounts at the Pulang copper mine,the maximum error is less than 0.18 m.The prediction of surface subsidence patterns in this mine can be achieved through the application of the probability integral method,which is grounded in the principles of stochastic medium theory.Utilizing the PIM allows for the anticipation of surface subsidence regularity,thereby facilitating effective surface treatment and mitigation of debris flow within the mine.By integrating 3D modeling with surface subsidence patterns,various recommendations can be formulated for the management of subsidence pits and the development of a drawing plan for the mine.
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