深厚表土综放采场顶板运动特征实测与数值分析

In-situ observation and numerical analysis of roof movement features of fully-mechanized sublevel caving face with deep alluvium

应用现场实测和数值模拟方法,对深厚表土综放采场顶板运动特征进行系统研究。结果表明:深厚表土综放采场支架载荷的时间效应显著;随着采场推进,直接顶周期性的形成"岩—矸"结构,低位、高位基本顶先后破断并造成采场来压;沿倾斜方向采场来压顺序符合一般采场顶板断裂特征;采场支架需控岩层范围大,高位基本顶破断、回转迫使低位基本顶破断、回转造成的采场来压强度大;采场超前应力动态监测技术为采场来压预报提供了一种方法。最后,给出了深厚表土综放采场顶板事故防治的建议。

By using the in-situ observation and numerical simulation, the roof moving features of ful-ly-mechanized sublevel caving face with deep alluvium has been studied. The results can be drawn as follows：1） The time effect of the load of supports in the fully mechanized caving face with deep allu-vium is significant. 2） While with advance of working face, the break of the immediate roof forms“rock-gangue”structure periodically and the break of the basic roof induces weighting of working face. 3） The weighting order along incline direction of the working face follows roof fracture characteristics of general working face. 4） The area of overlying strata area to be controlled by supports is large, and the strength of weighting induced by the upper basic roof breaking is large. 5） The advance stress fluc-tuation monitoring technology offers a new method for weighting prediction in working face. Finally, the suggestion about roof accident prevention of fully-mechanized sublevel caving face with deep allu-vium was proposed. The study results can be useful for roof control design and roof accidents preven-tion in fully-mechanized sublevel caving face with deep alluvium.