【摘要】：淺埋近距離煤層群上覆巖層受重復(fù)采動影響,裂隙疊加發(fā)育易形成采空區(qū)與地表連通。以典型近距離開采煤層群為例,采用物理模擬實驗和數(shù)值分析的方法對上、下煤層開采過程中上覆巖層的裂隙演化時空規(guī)律和應(yīng)力分布特征進行了模擬。結(jié)果表明:兩煤層開挖結(jié)束后,裂隙高度呈駝峰式分布,沿傾向和走向方向的兩側(cè)上方形成了較為明顯的應(yīng)力集中區(qū);上部煤層開挖結(jié)束后,最大豎向裂隙發(fā)育高度為75 m,但并未連通地表;隨著下部煤層開挖,裂隙重復(fù)發(fā)育,裂隙高度隨工作面推進逐漸增加,兩側(cè)裂隙率先與地表連通。
[Abstract]:The overlying strata of shallow buried and close distance coal seam group are affected by repeated mining, and the goaf is easy to be connected with the surface by the superimposed development of fissures. Taking the typical close mining coal seam group as an example, the temporal and spatial law of fracture evolution and stress distribution characteristics of overlying strata in the process of upper and lower coal seam mining are simulated by means of physical simulation experiment and numerical analysis. The results show that after the excavation of the two coal layers, the crack height is humped, and an obvious stress concentration area is formed along both sides of the tendency and strike direction; after the excavation of the upper coal seam, the maximum vertical fracture development height is 75 m, but it is not connected to the surface; with the excavation of the lower coal seam, the crack development is repeated, the crack height increases gradually with the advance of the working face, and the cracks on both sides are first connected to the surface.
【作者單位】： 西安科技大學(xué)能源學(xué)院;西部礦井開采及災(zāi)害防治教育部重點實驗室;中國礦業(yè)大學(xué)安全工程學(xué)院;煤礦瓦斯與火災(zāi)防治教育部重點實驗室;
【基金】：國家自然科學(xué)基金重點資助項目(51134019);國家自然科學(xué)基金青年科學(xué)基金資助項目(51404195)
【分類號】：TD31;TD752.2
，

本文編號：2504657