本文選題：含瓦斯煤體　切入點：瓦斯?jié)B流理論　出處：《中國礦業(yè)大學(xué)》2013年博士論文　論文類型：學(xué)位論文

【摘要】：含瓦斯煤層的動力災(zāi)害主要包括煤與瓦斯突出和沖擊地壓，動力災(zāi)害發(fā)生后會摧毀巷道等采掘空間，并伴隨著瓦斯涌出異常，嚴(yán)重威脅著煤礦安全高效生產(chǎn)和礦山工作人員的生命安全。含瓦斯煤層動力災(zāi)害發(fā)生時應(yīng)力場和瓦斯?jié)B流場是相互影響的，因此研究含瓦斯煤層應(yīng)力場和瓦斯場的氣固耦合效應(yīng)對進(jìn)一步揭示動力災(zāi)害機(jī)理及預(yù)防動力災(zāi)害發(fā)生有著十分重要的作用。本文利用理論建模和數(shù)值模擬手段系統(tǒng)研究了煤層應(yīng)力與瓦斯?jié)B流的耦合規(guī)律，，主要得到以下結(jié)論： （1）根據(jù)煤體結(jié)構(gòu)特點，采用雙重孔隙結(jié)構(gòu)模型描述煤體的多孔基質(zhì)和裂隙結(jié)構(gòu)特征。分析了煤體基質(zhì)在應(yīng)力作用下的壓縮變形規(guī)律，得到了基質(zhì)系統(tǒng)孔隙率、滲透率與應(yīng)力的變化關(guān)系；分析了裂隙受壓縮而閉合和受剪切而張開的規(guī)律，并采用分形理論建立了裂隙開度與應(yīng)力的變化模型，在此基礎(chǔ)上建立了三維空間裂隙系統(tǒng)的孔隙率、滲透率與復(fù)雜應(yīng)力場的關(guān)系。 （2）分析了受裂隙作用形成的煤體部分分割和部分連接的特殊結(jié)構(gòu)，得到了瓦斯吸附膨脹或解吸收縮應(yīng)變對煤體連接部分的有效應(yīng)力的影響，并在此基礎(chǔ)上建立了在瓦斯吸附膨脹或解吸收縮應(yīng)力作用下的含瓦斯煤體有效應(yīng)力方程。采用體積應(yīng)變量衡量裂隙煤體的損傷程度，建立了煤體的損傷演化方程；采用Mohr-Coulomb屈服準(zhǔn)則作為判斷破壞的依據(jù)，并分別對剪切破壞和拉伸破壞后的應(yīng)變量進(jìn)行塑性修正；同時分析了煤體粘聚力隨應(yīng)變增加而降低的特征，采用煤體粘聚力應(yīng)變軟化模型表征煤體的應(yīng)變軟化特征。 （3）根據(jù)瓦斯氣體的滲流規(guī)律和狀態(tài)方程，分別建立了基質(zhì)系統(tǒng)和裂隙系統(tǒng)內(nèi)瓦斯氣體的質(zhì)量守恒方程�；赥OUGH2多相流模擬軟件開發(fā)了TOUGH2(CH4)瓦斯?jié)B流模擬軟件，模擬分析了煤樣內(nèi)瓦斯?jié)B流過程，驗證了本軟件的合理性；采用C++語言編寫了煤體損傷本構(gòu)模型的dll庫文件，通過FLAC3D軟件對煤體單軸壓縮過程進(jìn)行了模擬，其結(jié)果準(zhǔn)確的反映了煤體的損傷破壞過程。應(yīng)力場對滲流參數(shù)產(chǎn)生影響，同時瓦斯?jié)B流場對煤體有效應(yīng)力產(chǎn)生影響，結(jié)合滲流參數(shù)與應(yīng)力關(guān)系和煤體有效應(yīng)力方程即構(gòu)成了氣固耦合模型。根據(jù)建立的氣固耦合模型，開發(fā)了TOUGH2(CH4)-FLAC氣固耦合數(shù)值模擬軟件，并模擬分析了有圍壓加載時煤體內(nèi)瓦斯?jié)B流規(guī)律，模擬結(jié)果與理論結(jié)果相符。根據(jù)模擬結(jié)果可以證明本文提出的氣固耦合模型和數(shù)值計算方法具有一定的可靠性。 （4）以鶴崗南山礦為工程背景，將開發(fā)的TOUGH2(CH4)-FLAC軟件應(yīng)用于現(xiàn)場，對巷道圍巖損傷演化和瓦斯?jié)B流情況進(jìn)行了模擬研究，得到了圍巖受沖擊擾動前后的損傷特征和瓦斯?jié)B流規(guī)律，揭示了沖擊擾動造成瓦斯涌出異常的機(jī)理。研究成果對深入認(rèn)識含瓦斯煤層動力災(zāi)害機(jī)理、制定預(yù)防措施等具有重要的意義，同時煤層氣固耦合程序的應(yīng)用為進(jìn)行煤層瓦斯?jié)B流規(guī)律分析提供了一種研究方法。
[Abstract]:Dynamic disaster of coal seams mainly include coal and gas outburst and rock burst, power after the disaster will destroy the roadway excavation space, and accompanied by abnormal gas emission, a serious threat to the safe and efficient production of coal mine and mine safety of staff. Gas containing coal layer dynamic disaster stress field and seepage field of gas is the mutual influence, so the study of gas bearing coal seam stress field and gas field gas solid coupling effect to further reveal the mechanism of dynamic disaster prevention and disaster power generation plays a very important role. This paper studies the coupling of seepage force should be coal and gas by using simulation model and numerical method to build theoretical system, mainly by the following conclusion:
(1) according to the structural characteristics of coal, porous matrix and fracture structure with dual pore structure model of coal was analyzed. The coal matrix in deformation under the action of stress, the porosity of the matrix system, change the relationship between permeability and stress; analysis of fracture under compression and shear closure open the law, and the open degree of crack model and the change of stress is established based on the fractal theory, the three-dimensional fracture system of porosity, permeability and complex stress field.
(2) analyzed by coal body part segmentation and part fracture formation of special structure connection, the expansion of gas adsorption or absorption solution of shrinkage strain of coal body connecting part of the effective stress effect is established based on the solution absorption expansion or shrinkage stress under the action of coal containing gas effectively stress equation in gas. The adsorption volume should damage variable to measure the fissures of coal, a coal damage evolution equation; Mohr-Coulomb yield criterion is used to estimate the failure as the basis, and the shear failure and tensile failure strain after plastic correction; and analyzes the coal cohesion with strain increase and reduce the strain characteristics, coal cohesion strain softening model characterization of coal softening characteristics.
(3) according to the seepage and gas state equation, mass conservation equation of gas matrix system and fracture system were established respectively. TOUGH2 multiphase flow simulation software is developed based on TOUGH2 (CH4) software to simulate the gas seepage, gas coal samples in the simulation analysis of infiltration process, verify the rationality of the software the use of C++ language; coal damage constitutive model of the DLL library, through the FLAC3D software of coal under uniaxial compression is simulated, the results reflect the failure process of coal damage. The stress field on the seepage parameters influence at the same time, gas flow field on the effective stress of coal production effect of combination of seepage parameters and stress and effective stress of coal gas equation constitutes a solid coupling model. According to the established gas solid coupling model, the development of TOUGH2 (CH4) numerical -FLAC gas solid coupling simulation software and simulation The law of gas seepage in coal is analyzed under the condition of confining pressure. The simulation results are consistent with the theoretical results. According to the simulation results, it is proved that the gas solid coupling model and numerical calculation method proposed in this paper are reliable.
(4) in Hegang Nanshan coal mine as the engineering background, the development of TOUGH2 (CH4) -FLAC software is applied to the scene, on the surrounding rock damage evolution and gas seepage simulation studies have been carried out, obtained by rock impact damage characteristics and gas seepage law before and after the disturbance, reveals the impact of disturbance caused by the abnormal gas emission mechanism. Research on understanding the mechanism of dynamic disaster of coal seams, is of great significance to develop preventive measures at the same time, application of coalbed gas solid coupling procedure for the analysis of seepage law of coal seam gas provides a kind of research method.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TD712

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