采矿与岩层控制工程学报2025，Vol.7Issue(4)：92-105,14.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1415
井下矸石级配特征及承压变形规律研究
Gradation characteristics and load-bearing deformation rule of gangue in underground
摘要
Abstract
Filling the gob directly with gangue generated during underground mining can not only reduce the ground land occupation,but also effectively control the stability of the gob roof.However,under the influence of time effect,the gangue will weaken the support of the roof due to load-bearing deformation,and then lead to surface collapse.To investigate the particle size gradation characteristics of underground gangue and its load-bearing deformation rule,image information extraction technology was used to obtain the particle size gradation of gangue,and gangue samples consistent with the distribution of gangue gradation were allocated according to the principle of equal scaling.The load-bearing deformation law of gangue samples under the same loading time of 24 hours and different constant loading of 5,10,15 and 20 MPa was studied by using the load-bearing deformation test apparatus.The particle size distribution of the underground gob pile exhibits a trend where smaller-sized waste rock particles predominate in quantity,decreasing as size increases.In terms of mass,smaller particles contribute less,showing an initial increase and then a decrease as particle size increases.The compression process of the gob sample comprises two stages:loading and constant load.With the increase of the constant load,the proportion of deformation occurring during the loading stage shows an increasing trend.The constant load stage can be further subdivided into rapid deformation and slow deformation phases.For the same duration of constant load,samples subjected to lower constant load settings produce greater strain.During compressive deformation,the proportion of smaller-sized particles continuously increases while larger-sized particles decrease.Waste rock particles in the 10-15 mm size range are identified as the stable particle size.Under a specific constant load,the degree of damage to typical waste rock particles gradually decreases as their layer's distance from the load application surface increases.Similarly,the vertical compression of a gob layer diminishes with increasing distance from the load application surface.Furthermore,under different constant load settings,the vertical pressure borne by the gob sample consistently exhibits a gradual decreasing trend as the distance of the layer from the load application surface increases.The vertical load transfer attenuation effect within the gob sample is verified from three aspects:particle breakage,deformation,and stress distribution.关键词
矸石充填/级配特征/承压变形/载荷传递折减/图像处理Key words
gangue filling/gradation characteristics/bearing deformation/load transfer discount/picture processing分类
矿业与冶金引用本文复制引用
王海龙,王晓帆,王晓卿,孟祥旭,赵振华,翟利军..井下矸石级配特征及承压变形规律研究[J].采矿与岩层控制工程学报,2025,7(4):92-105,14.基金项目
国家自然科学基金资助项目(51704152) （51704152）
中国博士后科学基金资助项目(2022M711969) （2022M711969）
山东省高等学校青创团队计划资助项目(2022KJ112) （2022KJ112）
