【摘要】：本文運(yùn)用彈塑性理論,并結(jié)合Griffith破壞準(zhǔn)則對工作面端部屈服區(qū)破壞范圍進(jìn)行了分析,在此基礎(chǔ)上運(yùn)用滑移線場理論建立底板塑性區(qū)破壞力學(xué)模型,給出了底板最大破壞深度及其塑性區(qū)分布范圍的理論求解方法,并分析了底板最大破壞深度與其影響因素的關(guān)系。運(yùn)用材料力學(xué)理論將底板隔水層簡化為彈性梁,考慮巖體損傷區(qū)內(nèi)部孔隙壓力的影響,運(yùn)用損傷力學(xué)進(jìn)行了理論分析,并給出了臨界損傷變量Dc的計算公式。在此基礎(chǔ)上,運(yùn)用斷裂力學(xué)建立斷裂力學(xué)模型,并給出了采場隔水層承壓水導(dǎo)升裂紋端部應(yīng)力集中系數(shù)的計算公式。最后,確定出煤層底板有效隔水層厚度。運(yùn)用斷裂力學(xué)理論中優(yōu)勢裂紋角建立了采場裂隙巖體優(yōu)勢角應(yīng)力-滲透性耦合力學(xué)模型,確定了原巖應(yīng)力狀態(tài)下巖體中裂隙分布的角度。在此基礎(chǔ)上結(jié)合采場斷裂力學(xué)模型,推導(dǎo)建立了采場平面應(yīng)力狀態(tài)下滲透系數(shù)方程,分析了采場附近巖體的滲透系數(shù)及其影響因素的關(guān)系。 結(jié)合雙柳煤礦地質(zhì)資料,運(yùn)用FLAC3D數(shù)值模擬軟件,模擬了工作面不同推進(jìn)度、承壓含水層不同巖性的情況,并對采場巖體的塑性區(qū)分布規(guī)律、工作面沿走向、傾向及底板深度方向的應(yīng)力場分布特征,底板的位移特征進(jìn)行了分析。模擬了煤層工作面不同寬度情況,對煤層底板應(yīng)力場分布特征進(jìn)行了分析。
[Abstract]:In this paper, the elastic-plastic theory and Griffith failure criterion are used to analyze the failure range of the yield zone at the end of the working face. On the basis of the analysis, the failure force model of the plastic zone of the bottom plate is established by using the slip line field theory. The theoretical solution method of the maximum failure depth and the distribution range of the plastic zone of the bottom plate is given, and the relationship between the maximum failure depth of the bottom plate and its influencing factors is analyzed. Based on the theory of material mechanics, this paper simplifies the bottom layer as elastic beam, considers the influence of internal pore pressure in rock mass damage zone, and makes theoretical analysis by using damage mechanics, and gives the calculation formula of critical damage variable DC. On the basis of this, the fracture mechanics model is established by using fracture mechanics, and the formula of stress concentration factor at the crack end of confined water conductance lift in water-proof layer of stope is given. Finally, the thickness of effective water insulation layer of coal seam floor is determined. Using the dominant crack angle in fracture mechanics theory, a mechanical model of stress-permeability coupling of fractured rock mass in stope is established, and the angle of fracture distribution in rock mass under the condition of original rock stress is determined. Based on the fracture mechanics model of stope, the equation of permeability coefficient under plane stress of stope is derived, and the relationship between permeability coefficient and influencing factors of rock mass near stope is analyzed. Combined with the geological data of Shuangliu Coal Mine, using FLAC3D numerical simulation software, this paper simulates the different advance degree of working face, different lithology of confined aquifer, and the distribution law of plastic zone of rock mass in stope, and the working face along the direction. The distribution characteristics of the stress field in the depth direction of the bottom plate and the displacement characteristics of the bottom plate are analyzed. The distribution characteristics of stress field in coal seam floor are analyzed by simulating the different width of coal seam face.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD74

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