水—巖耦合作用下花崗巖力學特性試驗研究
發(fā)布時間：2019-01-02 17:52
【摘要】：深部圍巖在高圍壓和高孔隙水壓力條件下所表現出來特殊的力學性質一直是影響煤礦深部開挖的問題,也是巖石力學需要解決的關鍵問題。選取花崗巖為研究對象,通過室內試驗模擬巖石在深部時的水-巖耦合條件,對花崗巖的強度和變形特性進行了研究�；谠囼灲Y果,以能量原理為基礎分析了花崗巖變形破壞全過程,主要的研究內容如下：通過四組圍壓和四組孔隙水壓力對比試驗的結果,分析得出水-巖耦合作用時圍壓對花崗巖強度的影響要遠大于孔隙水壓力。引用有效應力的概念,分析了有效圍壓對花崗巖有效峰值強度的作用效果,得出水-巖耦合作用下花崗巖有效峰值強度與有效圍壓為二次函數的關系,花崗巖有效剪切強度和有效正應力基本符合摩爾庫倫強度準則,而且可以通過有效峰值強度折減系數來描述孔隙水壓力對有效峰值強度的折減效果。通過分析不同水-巖耦合作用條件下體積應變與應力的關系,得出水-巖耦合作用下花崗巖擴容起點隨著圍壓的增大而發(fā)生滯后,隨著孔隙水壓力的增大而有提前現象。以應變軟化參數為中間橋梁,對水-巖耦合作用下花崗巖峰后應變軟化階段的力學參數進行分析,得出隨著應變軟化參數的增大廣義粘聚力不斷減小,相同應變軟化參數對應的廣義內摩擦角隨著孔隙水壓力的增大也有減小趨勢,廣義內摩擦角基本保持不變。在對水-巖耦合作用下花崗巖基本力學特性有了初步了解的基礎上,以能量原理為基礎對水-巖耦合作用下花崗巖的變形破壞全過程進行了解釋,然后對基于能量原理破壞準則的參數進行修正,得出了適用于水-巖耦合作用下花崗巖的破壞準則。將水-巖耦合作用下理論計算的花崗巖破壞強度與試驗結果和霍克-布朗破壞準則計算結果的進行對比,得出了修正后基于能量原理的破壞準則是偏安全的,可以作為以后工程應用的理論基礎。
[Abstract]:The special mechanical properties of deep surrounding rock under the condition of high confining pressure and high pore water pressure are always the problems that affect the deep excavation of coal mine and are also the key problems to be solved in rock mechanics. The strength and deformation characteristics of granite were studied by laboratory experiments to simulate the water-rock coupling condition in the deep part of the rock. Based on the experimental results, the whole process of granite deformation and failure is analyzed on the basis of energy principle. The main research contents are as follows: through four groups of confining pressure and four groups of pore water pressure contrast test results, The influence of confining pressure on the strength of granite is much greater than that of pore water pressure. Based on the concept of effective stress, the effect of effective confining pressure on the effective peak strength of granite is analyzed, and the relationship between the effective peak strength of granite and the effective confining pressure of granite under the coupling of water and rock is obtained. The effective shear strength and effective normal stress of granite basically accord with the Moore Coulomb strength criterion, and the effective peak strength reduction coefficient can be used to describe the reduction effect of pore water pressure on effective peak strength. Based on the analysis of the relationship between volume strain and stress under different water-rock coupling conditions, it is concluded that the starting point of granite expansion lags with the increase of confining pressure and advances with the increase of pore water pressure. Taking the strain softening parameter as the intermediate bridge, the mechanical parameters of the post-peak strain softening stage of granite under water-rock coupling are analyzed. It is concluded that the generalized cohesive force decreases with the increase of the strain softening parameter. The generalized internal friction angle corresponding to the same strain softening parameters also decreases with the increase of pore water pressure, and the generalized internal friction angle remains basically unchanged. Based on the preliminary understanding of the basic mechanical properties of granite under water-rock coupling, the whole process of deformation and failure of granite under water-rock coupling is explained on the basis of energy principle. Then the parameters of the failure criterion based on the energy principle are modified and the failure criterion for granite under water-rock coupling is obtained. By comparing the calculated failure strength of granite under water-rock coupling with the experimental results and the calculated results of Hawk-Brownian failure criterion, it is concluded that the modified failure criterion based on the energy principle is relatively safe. It can be used as the theoretical basis of engineering application in the future.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU45
本文編號：2398791
[Abstract]:The special mechanical properties of deep surrounding rock under the condition of high confining pressure and high pore water pressure are always the problems that affect the deep excavation of coal mine and are also the key problems to be solved in rock mechanics. The strength and deformation characteristics of granite were studied by laboratory experiments to simulate the water-rock coupling condition in the deep part of the rock. Based on the experimental results, the whole process of granite deformation and failure is analyzed on the basis of energy principle. The main research contents are as follows: through four groups of confining pressure and four groups of pore water pressure contrast test results, The influence of confining pressure on the strength of granite is much greater than that of pore water pressure. Based on the concept of effective stress, the effect of effective confining pressure on the effective peak strength of granite is analyzed, and the relationship between the effective peak strength of granite and the effective confining pressure of granite under the coupling of water and rock is obtained. The effective shear strength and effective normal stress of granite basically accord with the Moore Coulomb strength criterion, and the effective peak strength reduction coefficient can be used to describe the reduction effect of pore water pressure on effective peak strength. Based on the analysis of the relationship between volume strain and stress under different water-rock coupling conditions, it is concluded that the starting point of granite expansion lags with the increase of confining pressure and advances with the increase of pore water pressure. Taking the strain softening parameter as the intermediate bridge, the mechanical parameters of the post-peak strain softening stage of granite under water-rock coupling are analyzed. It is concluded that the generalized cohesive force decreases with the increase of the strain softening parameter. The generalized internal friction angle corresponding to the same strain softening parameters also decreases with the increase of pore water pressure, and the generalized internal friction angle remains basically unchanged. Based on the preliminary understanding of the basic mechanical properties of granite under water-rock coupling, the whole process of deformation and failure of granite under water-rock coupling is explained on the basis of energy principle. Then the parameters of the failure criterion based on the energy principle are modified and the failure criterion for granite under water-rock coupling is obtained. By comparing the calculated failure strength of granite under water-rock coupling with the experimental results and the calculated results of Hawk-Brownian failure criterion, it is concluded that the modified failure criterion based on the energy principle is relatively safe. It can be used as the theoretical basis of engineering application in the future.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU45
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