本文選題：煤層群 + 上保護層　； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：隨著煤層開采向深處發(fā)展,煤層具有的低滲透性、高瓦斯壓力和高地應(yīng)力嚴(yán)重增加了卸壓開采難度,降低了瓦斯抽采效果,而保護層是增透卸壓提高瓦斯抽采效果主要方法之一。本文主要針對近距離煤群瓦斯涌出礦井開采,運用理論分析、相似材料物理模擬實驗和數(shù)值模擬相結(jié)合的研究方法,系統(tǒng)的研究了在上保護層重復(fù)開采條件下被保護層多重增透卸壓后的瓦斯?jié)B流變化規(guī)律。通過自主設(shè)計實驗系統(tǒng)和實驗方法,開展相似材料物理模擬實驗,并結(jié)合采動對滲流影響的理論分析,得出保護層開采過程中被保護層瓦斯?jié)B流呈現(xiàn)規(guī)律性變化,對實驗結(jié)果處理分析得出:走整個走向上滲透率變化曲線呈駝峰狀,在推進過程中滲透率均經(jīng)歷降低、升高、降低、趨于平穩(wěn)的過程,且隨著保護層數(shù)增加,與被保護層的層間距變小,被保護層的滲透率越大。通過采用FLAC3D數(shù)值模擬軟件,建立多層上保護層重復(fù)采動三維數(shù)學(xué)模型,模擬得出不同保護層開采過程中被保護層的卸壓特性以及底板破壞程度,在保護層開采完全穩(wěn)定后,卸壓曲線呈現(xiàn)與滲透率變化曲線相反的駝峰狀,開采多層保護層,被保護層卸壓更充分,底板破壞越深、破壞程度越大。結(jié)合數(shù)值模擬和物理相似模擬,根據(jù)走向上底板應(yīng)力變化規(guī)律,得出在底板不同應(yīng)力區(qū)域內(nèi)的滲流變化規(guī)律,得出被保護層滲流呈區(qū)域性變化,其中應(yīng)力集中區(qū)減滲減流,卸壓膨脹區(qū)增透增流,應(yīng)力恢復(fù)區(qū)減滲減流且滲流大于原始應(yīng)力區(qū),并得出隨著保護層層數(shù)的增加影響滲流的主要原因。為優(yōu)化卸壓瓦斯抽采系統(tǒng)布置,使煤層增透卸壓,提高卸壓效果和瓦斯抽采率提供一定理論依據(jù)。
[Abstract]:With the development of coal seam mining, the coal seam has low permeability, high gas pressure and high ground stress seriously increase the pressure relief mining difficulty, and reduce the gas drainage effect. The protective layer is one of the main methods to improve the gas drainage effect. In this paper, aiming at the coal gushing out of the coal mine in the near distance, the research method of the combination of theoretical analysis, physical simulation experiment of similar material and numerical simulation is used. The variation law of gas seepage under the condition of repeated mining in the upper protective layer after multiple antireflection and pressure relief of the protective layer is systematically studied in this paper. Through the independent design of experimental system and experimental method, the physical simulation experiment of similar materials is carried out, and the theoretical analysis of the influence of mining on seepage flow is combined, and it is concluded that the gas seepage of protected layer presents regular changes during the mining process of protective layer. The analysis of the experimental results shows that the permeability change curve of the whole strike is hump, and the permeability decreases, increases, decreases, and tends to steady in the course of propulsion, and with the increase of the number of protective layers, The smaller the interval between the protected layer and the protected layer, the greater the permeability of the protected layer. By using FLAC3D numerical simulation software, the 3D mathematical model of repeated mining of multi-layer upper protective layer is established. The pressure relief characteristics of the protective layer and the damage degree of the bottom plate in the mining process of different protective layers are obtained by simulation. After the mining of the protective layer is completely stable, The pressure relief curve presents the hump shape contrary to the permeability change curve. When the multi-layer protective layer is mined, the pressure relief of the protected layer is more fully, the deeper the damage of the bottom plate is, the greater the damage degree is. Combined with numerical simulation and physical similarity simulation, according to the law of stress variation of strike upper floor, the law of seepage flow variation in different stress regions of bottom plate is obtained, and regional variation of seepage flow in protected layer is obtained, in which seepage reduction and flow reduction in stress concentration area are obtained. The seepage in the stress recovery area is larger than that in the original stress zone, and the main reason for the influence of seepage is obtained with the increase of the number of protective layers. This paper provides a theoretical basis for optimizing the arrangement of pressure relief gas drainage system, making the coal seam anti-permeability and pressure relief, improving the pressure relief effect and the gas extraction rate.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712

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