工作面回采速度对地表下沉的影响

The Influence of Working Face Mining Speed on Surface Subsidence

为分析工作面回采速度对地表下沉的影响,基于概率积分法静态下沉预计模型,引入时间参数,建立了概率积分法动态预计模型。采用数学模型分析回采速度与地表下沉、下沉速度、下沉加速度的关系,并通过Matlab直观表达。工作面回采速度对同一时间地表点下沉量、下沉启动时间、下沉时间、达到最大下沉时间、下沉速度、最大下沉速度、下沉加速度、下沉加速度峰值及达到峰值时间均有较大影响。回采速度与地表形变呈非线性关系,当回采速度达到一定阈值后,其与地表形变相关性越差。

To analyze the impact of mining speed on surface subsidence in working faces,based on the probability integral method static subsidence prediction model,it introduces time parameters to establish the probability integration method dynamic prediction model.By using mathematical models,it analyzes the relationship between mining speed and subsidence,subsidence speed,and subsidence acceleration,and expresses it intuitively through Matlab.The mining speed of the working face has a significant impact on the surface subsidence,subsidence initiation time,subsidence time,time to reach maximum subsidence,subsidence speed,maximum subsidence speed,subsidence acceleration,maximum subsidence acceleration,and time to reach maximum subsidence acceleration.The relationship between mining speed and surface deformation is non-linear.When the mining speed reaches a certain threshold,its correlation with surface deformation becomes worse.