【作者】 张永波； 崔海英；

【Author】 ZHANG Yongbo~①CUI Haiying~②(①Taiyuan University of Technology,Taiyuan 030024)(②Land Resource Government of Shanxi Province,Taiyuan 030024)

【机构】 太原理工大学； 山西省国土资源厅；

【摘要】 以霍州矿务局辛置煤矿2204工作面为背景,通过相似模拟实验,分析老采空区覆岩破坏的结构类型、覆岩失稳"活化"的机理以及老采空区砌体梁结构的失稳形式及其稳定条件。研究结果表明,采动破坏后老采空区及其上覆地层的岩体结构可以划分为四种类型,这种次生岩体结构对老采空区的"活化"有重要影响,其存在形式将决定老采空区"活化"的基本特点。通过对老采空区砌体梁结构进行的力学分析,得出滑落失稳主要取决于关键块和邻近岩体的物理力学特性和W/T的比值以及地表建筑物等对其施加附加荷载的大小,回转失稳与关键块和邻近岩体的物理力学特性和悬露岩块的厚长比h/l值有关。更多还原

【Abstract】 Taking the 2204 working face of Xinzhi Colliery in Huozhou as the background,through experiment of analog simulation,analyze the structure type of old goaf overburden rock breakage,instability activation mechanism of overburden rock and instability form and condition for stability of voussoir beam of old goaf.As the result,after mining and breakage,the rock mass structure of old goaf and overburden rock can be divided four types.This secondary rock structure has an important effect on old goaf activation.The existence form will decide the basic characteristic of old goaf activation.Through the mechanics analysis on voussoir beam of old goaf,it is obtained that instability due to sliding mainly depend upon the physical mechanics characteristic of key block and sideward rock, W/T value,and additional load of building on surface and so on.Rotational instability is related to the physical mechanics characteristic of key block and sideward rock and thick and length ratio h/l of the hanging rock.更多还原