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从矿山压力角度出发研究顶、底板岩层破坏高度的确定方法,用来预测矿井突水,比较重要。因为,为了防止矿井突水和安全、经济、合理地开发富水区的煤层,仅定性掌握回采工作中的突水规律是不够的,还须定量确定回采工作面对釆场顶底隔水层破坏的高度或深度。这样才能把握住井下突水规律。兹将我们对这一问题的初步分析研究介绍如下: 一、有关概念的介绍 1.单元采空区:所谓单元采空区是指从“开切眼”开始,沿走向回采煤层至老顶初次来压时的距离b(工作面宽度),工作面实际倾斜长度或倾向水平长度L和煤层的实际采厚m(或累计釆厚)所构成的采空区。 2.顶板有效破坏带;顶板有效破坏带,包括回采工作面顶板的冒落带、有效裂隙带的高
From the point of view of mine pressure, it is more important to study the method of determining the failure height of top and bottom rock stratum to predict mine water inrush. Because, in order to prevent mine water inrush and safety, economic and rational development of water-rich coal seam, only qualitative grasp of the law of water in the recovery work is not enough, but also to determine the quantitative recovery work face Boutong top floor aquifuge Destroy height or depth. In order to grasp the law of underground water inrush. We will introduce the preliminary analysis of this issue as follows: I. INTRODUCTION TO THE CONCEPT 1. Unit Gob: The so-called unit gob area refers to the area from the “open cut” to the coal seam to the top of the roof The distance b (face width), the actual slope length of the working face or the horizontal length of inclination L and the actual coal mining thickness m (or the cumulative thickness). 2. Roof effectively destroy belt; Roof effective destruction of the belt, including mining face roof caving zone, effective fracture zone high