本文選題：裂隙巖體 + 突水潰沙　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：我國目前煤炭資源開發(fā)重心已逐步向西部轉(zhuǎn)移,而西部礦區(qū)總體具有煤層埋深淺、基巖比較薄、上覆厚風(fēng)積沙的特點,易發(fā)生突水潰沙災(zāi)害,嚴(yán)重威脅安全生產(chǎn)和生態(tài)環(huán)境。因此開展裂隙巖體水沙滲流特性研究具有重要的意義。本文主要通過對裂隙巖體基本力學(xué)特性和裂隙巖體水沙滲流作用機理的研究,建立裂隙巖體水沙滲流耦合模型,數(shù)值分析裂隙巖體水沙流動特性。主要的研究工作如下:(1)裂隙巖體基本力學(xué)特性分析�；陔x散元方法對裂隙巖石加載過程中應(yīng)力應(yīng)變特性與聲發(fā)射特性之間的關(guān)系進行研究,基于摩爾庫倫準(zhǔn)則對裂隙巖體結(jié)構(gòu)面的強度效應(yīng)進行分析,數(shù)值模擬分析不同傾角裂隙巖石破壞情況以及不同曲線型裂隙巖石破壞過程裂隙擴展變化。研究表明,巖體強度不但取決于裂隙發(fā)育程度,還取決于裂隙面發(fā)育方向,裂隙傾角、形態(tài)的變化會對巖石整體強度產(chǎn)生不同影響。(2)建立裂隙巖體水沙滲流計算模型。首先對單個固體顆粒在液體中流動進行理論分析和數(shù)值模擬,得出固體沙顆粒在水中流動具有復(fù)雜的紊流狀態(tài)。其次對固體顆粒相互作用機理進行分析,定義裂隙上覆松散層固體顆粒所形成的三個動態(tài)區(qū)域。最后基于平行板理論對裂隙巖體進行簡化,建立裂隙巖體網(wǎng)絡(luò)水沙滲流模型并對水沙滲流進行模擬。研究表明,裂隙巖體內(nèi)部裂隙貫通性、裂隙拐角、裂隙寬度以及裂隙傾角都會對水沙滲流速率產(chǎn)生影響,水沙滲流過程中,固體沙顆粒以及水流對巖體的作用力與裂隙傾角和裂隙寬度有關(guān)。(3)裂隙巖體水沙滲流規(guī)律研究。在研究了上覆含水松散層壓力分布特征基礎(chǔ)上,對裂隙寬度以及裂隙傾角影響上覆松散層運動的規(guī)律進行分析�；陔x散元數(shù)值方法,系統(tǒng)分析了巖體內(nèi)部裂隙寬度、裂隙形態(tài)以及水壓力對水沙滲流運動的影響規(guī)律。通過理論分析及數(shù)值模擬對潰沙過程地表漏斗動態(tài)演變規(guī)律進行研究,潰沙所形成漏斗深度及擴展半徑隨時間變化具有冪函數(shù)關(guān)系。
[Abstract]:At present, the development center of coal resources in China has gradually shifted to the west, and the west mining area is generally characterized by shallow coal seam, thin bedrock and thick aeolian sand overlying, which is prone to water inrush and sand collapse, which seriously threatens the safety of production and ecological environment.Therefore, it is of great significance to study the seepage characteristics of fractured rock mass.Based on the study of the basic mechanical characteristics of fractured rock mass and the mechanism of water-sediment seepage in fractured rock mass, the coupled model of water-sediment seepage in fractured rock mass is established in this paper, and the characteristics of water-sediment flow in fractured rock mass are numerically analyzed.The main research work is as follows: 1) Analysis of basic mechanical properties of fractured rock mass.Based on discrete element method, the relationship between stress-strain characteristics and acoustic emission characteristics of fractured rock during loading is studied, and the strength effect of structural plane of fractured rock mass is analyzed based on the Moore Coulomb criterion.The fracture propagation of rock with different dip angle and different curve fracture is analyzed by numerical simulation.The results show that the strength of rock mass depends not only on the degree of fracture development, but also on the development direction of fracture surface, and the variation of fracture inclination and shape will have different effects on the overall strength of rock mass.Firstly, the theoretical analysis and numerical simulation of the flow of a single solid particle in a liquid are carried out, and it is concluded that the flow of a solid sand particle in water has a complex turbulent state.Secondly, the interaction mechanism of solid particles is analyzed, and three dynamic regions formed by solid particles with loose layer on fracture are defined.Finally, based on the parallel plate theory, the fractured rock mass is simplified, and the water and sediment seepage model of the fractured rock mass network is established and simulated.The results show that the fracture penetration, crack corner, crack width and crack inclination will affect the seepage rate of water and sediment in the process of water and sediment seepage.The effect of solid sand particles and water flow on rock mass is related to crack inclination and crack width.Based on the study of the pressure distribution characteristics of the overlying water-bearing loose layer, the law of the influence of crack width and crack dip angle on the movement of the overlying loose layer is analyzed.Based on discrete element numerical method, the influence of fracture width, fracture shape and water pressure on seepage movement in rock mass is systematically analyzed.Through theoretical analysis and numerical simulation, the dynamic evolution of the surface funnel in the process of sand collapse is studied. The variation of the funnel depth and the spreading radius with time has a power function relationship.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD313

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本文編號：1740028