【摘要】：深部圍巖在高圍壓和高孔隙水壓力條件下所表現(xiàn)出來特殊的力學(xué)性質(zhì)一直是影響煤礦深部開挖的問題,也是巖石力學(xué)需要解決的關(guān)鍵問題。選取花崗巖為研究對(duì)象,通過室內(nèi)試驗(yàn)?zāi)M巖石在深部時(shí)的水-巖耦合條件,對(duì)花崗巖的強(qiáng)度和變形特性進(jìn)行了研究�；谠囼�(yàn)結(jié)果,以能量原理為基礎(chǔ)分析了花崗巖變形破壞全過程,主要的研究?jī)?nèi)容如下：通過四組圍壓和四組孔隙水壓力對(duì)比試驗(yàn)的結(jié)果,分析得出水-巖耦合作用時(shí)圍壓對(duì)花崗巖強(qiáng)度的影響要遠(yuǎn)大于孔隙水壓力。引用有效應(yīng)力的概念,分析了有效圍壓對(duì)花崗巖有效峰值強(qiáng)度的作用效果,得出水-巖耦合作用下花崗巖有效峰值強(qiáng)度與有效圍壓為二次函數(shù)的關(guān)系,花崗巖有效剪切強(qiáng)度和有效正應(yīng)力基本符合摩爾庫倫強(qiáng)度準(zhǔn)則,而且可以通過有效峰值強(qiáng)度折減系數(shù)來描述孔隙水壓力對(duì)有效峰值強(qiáng)度的折減效果。通過分析不同水-巖耦合作用條件下體積應(yīng)變與應(yīng)力的關(guān)系,得出水-巖耦合作用下花崗巖擴(kuò)容起點(diǎn)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(xiàn)象。以應(yīng)變軟化參數(shù)為中間橋梁,對(duì)水-巖耦合作用下花崗巖峰后應(yīng)變軟化階段的力學(xué)參數(shù)進(jìn)行分析,得出隨著應(yīng)變軟化參數(shù)的增大廣義粘聚力不斷減小,相同應(yīng)變軟化參數(shù)對(duì)應(yīng)的廣義內(nèi)摩擦角隨著孔隙水壓力的增大也有減小趨勢(shì),廣義內(nèi)摩擦角基本保持不變。在對(duì)水-巖耦合作用下花崗巖基本力學(xué)特性有了初步了解的基礎(chǔ)上,以能量原理為基礎(chǔ)對(duì)水-巖耦合作用下花崗巖的變形破壞全過程進(jìn)行了解釋,然后對(duì)基于能量原理破壞準(zhǔn)則的參數(shù)進(jìn)行修正,得出了適用于水-巖耦合作用下花崗巖的破壞準(zhǔn)則。將水-巖耦合作用下理論計(jì)算的花崗巖破壞強(qiáng)度與試驗(yàn)結(jié)果和霍克-布朗破壞準(zhǔn)則計(jì)算結(jié)果的進(jìn)行對(duì)比,得出了修正后基于能量原理的破壞準(zhǔn)則是偏安全的,可以作為以后工程應(yīng)用的理論基礎(chǔ)。
[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(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU45

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