采场上覆岩层结构的形态与受力分析

本文以开采后岩层移动实测的形态曲线为基础，建立了断裂岩块间的铰合关系，进一步证明了“砌体梁”力学模型是层状矿体开采后岩层的基本结构形式。决定此结构平衡与否的关键块是离层区上方的铰接岩块。本文以此结构的力学模型为基础推得岩层内部位移曲线应以（Ｗｘ）ｉ＝（Ｗ０）ｉ（１－ｅ＾－ｘ／２ｌｉ）表示较为合适。上下层结构位移曲线的曲率变化导致了离层区的形成。

THEORETICAL ANALYSIS ON THE STRUCTUKAL FORM AND STABILITY OF OVERLYING STKATA IN LONGWALL MINING

Based on the displacement behaviour of the overlying strata in longwall mining,theinteraction between the fractured blocks of the overlying strong strata has been discussedin this paper and then a model of the voussior beam in this condition is oerformed.Thekey block of this structure is the 1-st and 2-nd block of the fractured stratum. The stabili-ty of this structure will be determined by the interaction between these blocks. Then thedisplacement curve of the structure is also discussed. The form will be as follows It is obvious that the separated zone above the mined area is performed by the variations of the curvature of the strata displacement.