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

【摘要】：隨著煤層開(kāi)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(kāi)采難度,降低了瓦斯抽采效果,而保護(hù)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(duì)近距離煤群瓦斯涌出礦井開(kāi)采,運(yùn)用理論分析、相似材料物理模擬實(shí)驗(yàn)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(hù)層重復(fù)開(kāi)采條件下被保護(hù)層多重增透卸壓后的瓦斯?jié)B流變化規(guī)律。通過(guò)自主設(shè)計(jì)實(shí)驗(yàn)系統(tǒng)和實(shí)驗(yàn)方法,開(kāi)展相似材料物理模擬實(shí)驗(yàn),并結(jié)合采動(dòng)對(duì)滲流影響的理論分析,得出保護(hù)層開(kāi)采過(guò)程中被保護(hù)層瓦斯?jié)B流呈現(xiàn)規(guī)律性變化,對(duì)實(shí)驗(yàn)結(jié)果處理分析得出:走整個(gè)走向上滲透率變化曲線呈駝峰狀,在推進(jìn)過(guò)程中滲透率均經(jīng)歷降低、升高、降低、趨于平穩(wěn)的過(guò)程,且隨著保護(hù)層數(shù)增加,與被保護(hù)層的層間距變小,被保護(hù)層的滲透率越大。通過(guò)采用FLAC3D數(shù)值模擬軟件,建立多層上保護(hù)層重復(fù)采動(dòng)三維數(shù)學(xué)模型,模擬得出不同保護(hù)層開(kāi)采過(guò)程中被保護(hù)層的卸壓特性以及底板破壞程度,在保護(hù)層開(kāi)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(kāi)采多層保護(hù)層,被保護(hù)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(hù)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(hù)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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 謝和平;張澤天;高峰;張茹;高明忠;劉建鋒;;不同開(kāi)采方式下煤巖應(yīng)力場(chǎng)-裂隙場(chǎng)-滲流場(chǎng)行為研究[J];煤炭學(xué)報(bào);2016年10期

2 李圣偉;高明忠;謝晶;譚強(qiáng);邱治強(qiáng);;保護(hù)層開(kāi)采卸壓增透效應(yīng)及其定量表征方法研究[J];四川大學(xué)學(xué)報(bào)(工程科學(xué)版);2016年S1期

3 邱治強(qiáng);高明忠;汪文勇;劉珂宏;;不同保護(hù)層開(kāi)采模式卸壓增透差異性研究[J];礦業(yè)研究與開(kāi)發(fā);2016年04期

4 程志恒;齊慶新;李宏艷;張浪;劉曉剛;;近距離煤層群疊加開(kāi)采采動(dòng)應(yīng)力-裂隙動(dòng)態(tài)演化特征實(shí)驗(yàn)研究[J];煤炭學(xué)報(bào);2016年02期

5 吳家浩;王兆豐;王立國(guó);曹超;;開(kāi)采上保護(hù)層下伏煤巖應(yīng)力效應(yīng)演化規(guī)律[J];煤礦安全;2015年10期

6 魏建平;秦恒潔;王登科;姚邦華;;含瓦斯煤滲透率動(dòng)態(tài)演化模型[J];煤炭學(xué)報(bào);2015年07期

7 張勇;張春雷;趙甫;;近距離煤層群開(kāi)采底板不同分區(qū)采動(dòng)裂隙動(dòng)態(tài)演化規(guī)律[J];煤炭學(xué)報(bào);2015年04期

8 王新華;王晨;白麗;;煤炭消費(fèi)結(jié)構(gòu)趨勢(shì)分析與調(diào)控機(jī)制研究[J];煤炭經(jīng)濟(jì)研究;2014年11期

9 謝和平;周宏偉;薛東杰;高峰;;我國(guó)煤與瓦斯共采:理論、技術(shù)與工程[J];煤炭學(xué)報(bào);2014年08期

10 宋衛(wèi)華;呂鵬飛;劉晨陽(yáng);趙健;;近距離煤層群上保護(hù)層開(kāi)采煤巖體動(dòng)力學(xué)演化[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年09期

相關(guān)博士學(xué)位論文 前3條

1 胡少斌;多尺度裂隙煤體氣固耦合行為及機(jī)制研究[D];中國(guó)礦業(yè)大學(xué);2015年

2 王海鋒;采場(chǎng)下伏煤巖體卸壓作用原理及在被保護(hù)層卸壓瓦斯抽采中的應(yīng)用[D];中國(guó)礦業(yè)大學(xué);2008年

3 張百勝;極近距離煤層開(kāi)采圍巖控制理論及技術(shù)研究[D];太原理工大學(xué);2008年

相關(guān)碩士學(xué)位論文 前2條

1 郭良經(jīng);火成巖下上保護(hù)層開(kāi)采底板煤巖體卸壓保護(hù)范圍研究[D];安徽理工大學(xué);2012年

2 高明松;上保護(hù)層開(kāi)采煤巖變形與卸壓瓦斯抽采技術(shù)研究[D];安徽理工大學(xué);2011年

，

本文編號(hào)：2049566