【摘要】：實(shí)踐證明保護(hù)層開(kāi)采是預(yù)防煤與瓦斯突出最有效的區(qū)域防突措施；而卸壓效應(yīng)與覆巖條件密切相關(guān)。本文針對(duì)三種覆巖模型,運(yùn)用UDEC數(shù)值模擬軟件研究了層間距、層間巖層巖性、層間關(guān)鍵層位置、被保護(hù)層上關(guān)鍵層厚度以及關(guān)鍵層的破斷距等不同開(kāi)采因素下保護(hù)層開(kāi)采卸壓效應(yīng),研究表明：(1)層間距越大,被保護(hù)層膨脹率越低、卸壓系數(shù)越小。(2)隨著層間巖層硬度的增加,卸壓始動(dòng)距增加,卸壓程度減��；被保護(hù)層膨脹率、膨脹區(qū)間有所增加。(3)層間關(guān)鍵層層位越高、破斷距越長(zhǎng),被保護(hù)層裂隙發(fā)育不明顯,卸壓效果越差。(4)被保護(hù)層上方關(guān)鍵層厚度、破斷距增加,被保護(hù)層卸壓特征參數(shù)越大,越利于被保護(hù)層的卸壓與瓦斯解吸。 在相同層間距條件下,詳細(xì)分析了不同采場(chǎng)覆巖數(shù)值模型采動(dòng)過(guò)程中煤巖應(yīng)力分布、卸壓煤層變形特征、裂隙場(chǎng)動(dòng)態(tài)演化與時(shí)空關(guān)系、關(guān)鍵層破斷前后以及破斷距離增加后煤巖層卸壓效應(yīng),得出結(jié)論：(1)三種模型沿走向應(yīng)力分區(qū)、膨脹分區(qū)特性相同,各個(gè)區(qū)間的寬度及時(shí)間不同,有明顯的時(shí)間效應(yīng)；(2)關(guān)鍵層的位置以及破斷距離對(duì)煤巖裂隙場(chǎng)演化、應(yīng)力分布、膨脹變形規(guī)律的影響很大。 上述結(jié)論為下保護(hù)層開(kāi)采實(shí)現(xiàn)區(qū)域性預(yù)防煤與瓦斯突出提供一定的理論依據(jù)。
[Abstract]:It has been proved that the mining of protective layer is the most effective measure to prevent coal and gas outburst, and the pressure relief effect is closely related to the overburden condition. In this paper, for three kinds of overburden models, the interval between layers, the lithology of interlayer and the position of key layer between layers are studied by using UDEC numerical simulation software. Under different mining factors, such as the thickness of the key layer on the protected layer and the breaking distance of the critical layer, the research shows that: (1) the bigger the interval between the layers, the lower the expansion rate of the protected layer, The pressure relief coefficient is smaller. (2) with the increase of interlayer hardness, the initial pressure relief distance increases and the pressure relief degree decreases, while the expansion rate of the protected layer increases, and the expansion interval increases. (3) the higher the key layer position between layers, the longer the fracture distance. (4) the thickness of the key layer above the protective layer and the breaking fault distance increase, the larger the characteristic parameters of the protected layer is, the more favorable the pressure relief and gas desorption of the protected layer are. Under the condition of the same interval, the stress distribution of coal and rock, the deformation characteristics of pressure relief coal seam, the dynamic evolution of fracture field and the relationship between time and space in mining process of overburden rock in different stope are analyzed in detail. The results show that: (1) the three models have the same characteristics of expansion zone along the strike stress zone, the width and time of each interval are different and have obvious time effect; (2) the location of the critical layer and the breaking distance have great influence on the evolution, stress distribution and expansion deformation of the fracture field of coal and rock. The above conclusions provide some theoretical basis for regional prevention of coal and gas outburst.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD713;TD32

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本文編號(hào)：2278205