急倾斜煤层煤岩变形局部化特征现场监测

摘要

急倾斜煤层开挖扰动区煤体动态变形具有明显局部化特征,易诱致动力学破坏.以大洪沟矿巷道动压防治为目标,通过煤岩局部化变形指标分析,室内测试、现场光学观测和表面变形监测等方法,定量分析了动压巷道两帮和顶板不同深度的侧向与垂直变形及演化特征.结果表明:巷道局部化变形差异性显著,在两巷交汇区域,B3巷道最大侧向变形达0.5m,顶板最大垂直变形达0.6m.确定动压破坏严重区域范围为15.0 ～20.0 m.这为现场灾害预测和调控提供判据.%There exist the localization characteristics of coal-rockmass dynamic deformation surroundingrnexcavation disturbed zone(EDZ) in steep and heavy thick coal seam. The dynamic destabilization and damage would be induceded. For the purpose of the dynamic pressure prevention to roadway of Dahong-gou mine, the analysis of coal-roakmass localization deformation index, expeiment test, field optic observation and superficies deformation,etc. ,had been performed. The lateral and perpendicular deformation and their evolvement characteristics upon the wall and roof were quantitatively analyzed at various depth in dynamic pressure roadway. The results indicated that the diversity of roadway localization deformation is very remarkable. At the roadway crossing zone,the maximal lateral and roof perpendicular deformation of B3 roadway is 0. 5 m and 0.6 m,respectively. The 15.0～20.0 m range of dynamic pressure destabilization were determined. Those provides necessary basis for hazard prediction and dynamic control.