不同開采條件下煤巖損傷演化與煤層瓦斯?jié)B透機理研究
發(fā)布時間：2018-07-15 07:27
【摘要】：煤礦開采歷程中，長期以來將煤層瓦斯視作煤礦井下安全生產(chǎn)第一災(zāi)害，提高煤層滲透率，從而增強煤層瓦斯抽采效果，減少安全生產(chǎn)隱患，并抽采出來作為清潔能源加以利用，因此，，煤巖損傷演化及其滲透機理一直是我國煤礦安全研究領(lǐng)域的重點和難點。為增強對煤巖損傷演化及滲透性的認識，本文以重慶松藻煤電有限責任公司松藻煤礦K1煤層、K2煤層和山西晉城無煙煤業(yè)集團有限責任公司趙莊礦3#煤層的煤為研究對象，從煤巖三軸應(yīng)力狀態(tài)、周期性采掘擾動及煤層降壓瓦斯抽采等條件出發(fā)，采用實驗室測試和理論研究結(jié)合的方法，系統(tǒng)地開展了煤巖孔裂隙特征及其吸附解吸特性、三軸應(yīng)力狀態(tài)下煤巖損傷演化與滲透機理、周期性采掘擾動下煤巖損傷演化與滲透機理、煤層降壓瓦斯抽采過程中煤巖損傷演化與滲透機理、多場耦合滲透率模型及滲透率敏感性分析等方面的研究，并結(jié)合巖石力學(xué)、滲流力學(xué)及損傷力學(xué)從理論層面上進行了一系列有益的探討。通過本文研究，在以下方面取得了一些進展： 1)分析了煤巖原生孔裂隙結(jié)構(gòu)特征，并利用HCA型高壓容量法吸附裝置對其吸附瓦斯特性進行了試驗研究，得到了不同溫度下的等溫吸附曲線及吸附常數(shù)a、b值隨溫度的變化規(guī)律。 2)開展了三軸應(yīng)力狀態(tài)下不同溫度、不同粒徑、不同瓦斯壓力條件下(溫度)的力學(xué)特性及滲流特性試驗研究，并在不同開采方式下的加卸載試驗中進行了三種不同卸載速率條件下的試驗研究，分別探討了煤巖的變形特性、滲透特性等損傷演化規(guī)律及其煤巖變形與滲透率關(guān)系。 3)利用統(tǒng)計損傷的概念和方法，建立了考慮三軸應(yīng)力狀態(tài)及溫度的煤巖統(tǒng)計損傷本構(gòu)模型，并通過試驗所測得數(shù)據(jù)對其實用性及合理性進行了驗證，結(jié)果表明，考慮溫度的煤巖統(tǒng)計損傷本構(gòu)模型的理論曲線能夠較好地反映實測煤巖損傷演化趨勢，其統(tǒng)計損傷本構(gòu)模型理論計算數(shù)據(jù)能夠較好與實驗測定曲線吻合。 4)通過不同溫度、不同粒徑和不同穩(wěn)定時間條件下的煤巖周期性荷載試驗研究了周期性采掘擾動下煤巖損傷演化與滲透機理，系統(tǒng)地探討了煤巖加、卸載階段的主應(yīng)力差、滲透率與軸向應(yīng)變關(guān)系，并分析了3種條件下的單次循環(huán)變形及滲透特性，變形、滲透率隨時間和循環(huán)次數(shù)關(guān)系等變化規(guī)律；探討了不同穩(wěn)定時間條件下煤巖滲透率變化滯后于體積應(yīng)變。 5)通過不同溫度條件下周期性荷載試驗，探討了煤變形的能量演化機制，從能量角度出發(fā)，突出了煤在不同溫度條件下循環(huán)荷載作用過程中的能量轉(zhuǎn)化關(guān)系及應(yīng)變能轉(zhuǎn)化速率的研究，分析了吸收能、彈性應(yīng)變能、耗散能隨循環(huán)次數(shù)及溫度的變化規(guī)律；基于能量耗散分析建立的煤巖損傷演化方程進行了驗證，測定了相關(guān)參數(shù)指標，較好地描述煤巖在壓縮時的損傷演化過程，探討了能量耗散與損傷的關(guān)系。 6)通過不同應(yīng)力、不同溫度條件下(CH4、He)的氣體壓力降低滲流試驗，分析了煤層降壓瓦斯抽采過程中煤巖變形特性和滲透特性，并探討了不同應(yīng)力條件下煤巖的吸附膨脹、解吸基質(zhì)收縮變形和有效應(yīng)力對滲透率影響、不同溫度下煤巖應(yīng)變隨氣體壓力和溫度的變化趨勢、煤巖滲透率隨氣體壓力下降呈先減小后增大的趨勢、煤巖滲透率隨溫度的升高呈現(xiàn)先減小后增大的趨勢以及滲透率和體積應(yīng)變關(guān)系，研究了煤巖割理壓縮系數(shù)的可變性。 7)基于Jishan Liu模型、Shi-Durucan模型以及煤巖多孔介質(zhì)均質(zhì)、各向同性熱彈性的有效應(yīng)力與應(yīng)變關(guān)系，在考慮應(yīng)力、溫度和瓦斯的吸附解吸等因素以及改進其算法和條件的基礎(chǔ)上，建立了多場耦合滲透率模型，通過試驗數(shù)據(jù)驗證和及其與PM模型和SD模型的對比分析，證明所構(gòu)建的滲透率模型能夠較好地反映實測滲透率的變化趨勢；通過定義氣體壓力敏感性系數(shù)和溫度敏感性系數(shù)，推導(dǎo)了基于敏感性系數(shù)的煤巖滲透率與氣體壓力、溫度的函數(shù)關(guān)系式開展了不同氣體壓力和不同溫度條件下煤層滲透性的敏感性分析。
[Abstract]:In the course of coal mining, coal seam gas is considered as the first disaster of safety production in coal mine for a long time, improving the permeability of coal seam, thus enhancing the effect of coal seam gas extraction, reducing the hidden danger of safety production and exploiting it as clean energy. Therefore, the evolution of coal rock damage and its permeation mechanism have always been the research of coal mine safety in China. In order to enhance the understanding of the evolution and permeability of coal and rock damage, this paper takes Chongqing song alga coal and electricity limited liability company, K1 coal seam in pines coal mine, K2 coal seam and Shanxi Jincheng smokeless coal industry Refco Group Ltd Zhao Zhuangkuang 3# coal seam as the research object, from coal rock three axis stress state, periodic mining disturbance and coal seam Based on the conditions of gas extraction and gas extraction, the characteristics and adsorption desorption characteristics of the coal and rock holes, the mechanism of coal rock damage evolution and infiltration under the three axis stress state, the mechanism of coal rock damage evolution and infiltration under the periodic excavation disturbance, the coal seam depressurization in the process of gas extraction in the coal seam are carried out in a combination of laboratory test and theoretical research. The study of rock damage evolution and permeability mechanism, multi field coupling permeability model and permeability sensitivity analysis, and a series of beneficial discussions on the theoretical level of rock mechanics, seepage mechanics and damage mechanics. Some progress has been made in the following aspects:
1) the characteristics of the fracture structure of the primary pore of the coal and rock are analyzed. The adsorption gas characteristics of the adsorption gas are studied by the HCA high pressure capacity adsorption device. The isothermal adsorption curve and the adsorption constant a and the b value with the temperature are obtained at different temperatures.
2) the mechanical properties and percolation characteristics of different temperatures, different particle sizes and different gas pressure conditions (temperature) were carried out under the three axis stress state, and three different unloading rates were carried out in the loading and unloading tests under different mining methods, and the deformation characteristics and permeability characteristics of the coal and rock were discussed respectively. The evolution law of damage and the relationship between coal and rock deformation and permeability.
3) by using the concept and method of statistical damage, a statistical damage constitutive model of coal and rock with three axis stress state and temperature is established and verified by the data measured by the test. The results show that the theoretical curve of the constitutive model of the statistical damage of coal and rock considering the temperature can better reflect the measured coal and rock loss. The theoretical calculation data of the statistical damage constitutive model agree well with the experimental curve.
4) through the cyclic loading test of coal and rock under different temperature, different particle size and different stable time, the damage evolution and permeability mechanism of coal and rock under periodic excavation disturbance are studied. The main stress difference, permeability and axial strain of coal rock adding and unloading stage are systematically discussed, and the single cyclic deformation and seepage under 3 conditions are analyzed. The permeability of coal and rock is lagged behind the volume strain under the conditions of different time and time.
5) through the periodic load test under different temperature conditions, the energy evolution mechanism of coal deformation is discussed. From the point of view of energy, the energy conversion relation and the strain energy conversion rate of coal in the process of cyclic loading under different temperatures are studied. The absorption energy, elastic strain energy and dissipative energy are analyzed with the cycle times and temperature. The evolution equation of coal rock damage based on energy dissipation is verified and the related parameters are measured. The damage evolution process of coal and rock in compression is described well, and the relationship between energy dissipation and damage is discussed.
6) through the seepage test of gas pressure reduction under different stress and different temperature conditions (CH4, He), the deformation characteristics and permeability characteristics of coal and rock in the process of coal seam lowering gas extraction are analyzed, and the adsorption expansion of coal and rock under different stress conditions, the effect of the shrinkage deformation of the desorption matrix and the effective stress on the permeability, and the coal rock under different temperatures are discussed. With the change trend of gas pressure and temperature, the permeability of coal and rock decreases first and then increases with the decrease of gas pressure. The permeability of coal rock decreases first and then increases, and the relationship between permeability and volume strain, and the variability of the compression coefficient of coal and rock cleats is studied.
7) based on the Jishan Liu model, the Shi-Durucan model and the homogeneous porous medium of coal and rock, the relationship between the effective stress and strain of isotropic thermoelastic. On the basis of considering the factors such as stress, temperature and gas adsorption and desorption, and improving the algorithm and conditions, the multi field coupling permeability model is established, which is verified by the test data and with the PM. The contrast analysis of the model and the SD model proves that the permeability model can reflect the change trend of the measured permeability better. By defining the sensitivity coefficient of gas pressure and the temperature sensitivity coefficient, the permeability and gas pressure based on the sensitivity coefficient are derived, and the function of temperature is carried out with different gas pressure. Sensitivity analysis of coal seam permeability under different temperature conditions.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TD712.6
本文編號：2123307
[Abstract]:In the course of coal mining, coal seam gas is considered as the first disaster of safety production in coal mine for a long time, improving the permeability of coal seam, thus enhancing the effect of coal seam gas extraction, reducing the hidden danger of safety production and exploiting it as clean energy. Therefore, the evolution of coal rock damage and its permeation mechanism have always been the research of coal mine safety in China. In order to enhance the understanding of the evolution and permeability of coal and rock damage, this paper takes Chongqing song alga coal and electricity limited liability company, K1 coal seam in pines coal mine, K2 coal seam and Shanxi Jincheng smokeless coal industry Refco Group Ltd Zhao Zhuangkuang 3# coal seam as the research object, from coal rock three axis stress state, periodic mining disturbance and coal seam Based on the conditions of gas extraction and gas extraction, the characteristics and adsorption desorption characteristics of the coal and rock holes, the mechanism of coal rock damage evolution and infiltration under the three axis stress state, the mechanism of coal rock damage evolution and infiltration under the periodic excavation disturbance, the coal seam depressurization in the process of gas extraction in the coal seam are carried out in a combination of laboratory test and theoretical research. The study of rock damage evolution and permeability mechanism, multi field coupling permeability model and permeability sensitivity analysis, and a series of beneficial discussions on the theoretical level of rock mechanics, seepage mechanics and damage mechanics. Some progress has been made in the following aspects:
1) the characteristics of the fracture structure of the primary pore of the coal and rock are analyzed. The adsorption gas characteristics of the adsorption gas are studied by the HCA high pressure capacity adsorption device. The isothermal adsorption curve and the adsorption constant a and the b value with the temperature are obtained at different temperatures.
2) the mechanical properties and percolation characteristics of different temperatures, different particle sizes and different gas pressure conditions (temperature) were carried out under the three axis stress state, and three different unloading rates were carried out in the loading and unloading tests under different mining methods, and the deformation characteristics and permeability characteristics of the coal and rock were discussed respectively. The evolution law of damage and the relationship between coal and rock deformation and permeability.
3) by using the concept and method of statistical damage, a statistical damage constitutive model of coal and rock with three axis stress state and temperature is established and verified by the data measured by the test. The results show that the theoretical curve of the constitutive model of the statistical damage of coal and rock considering the temperature can better reflect the measured coal and rock loss. The theoretical calculation data of the statistical damage constitutive model agree well with the experimental curve.
4) through the cyclic loading test of coal and rock under different temperature, different particle size and different stable time, the damage evolution and permeability mechanism of coal and rock under periodic excavation disturbance are studied. The main stress difference, permeability and axial strain of coal rock adding and unloading stage are systematically discussed, and the single cyclic deformation and seepage under 3 conditions are analyzed. The permeability of coal and rock is lagged behind the volume strain under the conditions of different time and time.
5) through the periodic load test under different temperature conditions, the energy evolution mechanism of coal deformation is discussed. From the point of view of energy, the energy conversion relation and the strain energy conversion rate of coal in the process of cyclic loading under different temperatures are studied. The absorption energy, elastic strain energy and dissipative energy are analyzed with the cycle times and temperature. The evolution equation of coal rock damage based on energy dissipation is verified and the related parameters are measured. The damage evolution process of coal and rock in compression is described well, and the relationship between energy dissipation and damage is discussed.
6) through the seepage test of gas pressure reduction under different stress and different temperature conditions (CH4, He), the deformation characteristics and permeability characteristics of coal and rock in the process of coal seam lowering gas extraction are analyzed, and the adsorption expansion of coal and rock under different stress conditions, the effect of the shrinkage deformation of the desorption matrix and the effective stress on the permeability, and the coal rock under different temperatures are discussed. With the change trend of gas pressure and temperature, the permeability of coal and rock decreases first and then increases with the decrease of gas pressure. The permeability of coal rock decreases first and then increases, and the relationship between permeability and volume strain, and the variability of the compression coefficient of coal and rock cleats is studied.
7) based on the Jishan Liu model, the Shi-Durucan model and the homogeneous porous medium of coal and rock, the relationship between the effective stress and strain of isotropic thermoelastic. On the basis of considering the factors such as stress, temperature and gas adsorption and desorption, and improving the algorithm and conditions, the multi field coupling permeability model is established, which is verified by the test data and with the PM. The contrast analysis of the model and the SD model proves that the permeability model can reflect the change trend of the measured permeability better. By defining the sensitivity coefficient of gas pressure and the temperature sensitivity coefficient, the permeability and gas pressure based on the sensitivity coefficient are derived, and the function of temperature is carried out with different gas pressure. Sensitivity analysis of coal seam permeability under different temperature conditions.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TD712.6
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