發(fā)布時間：2019-02-23 14:21

【摘要】：巖石蠕變是隧道與地下工程、構筑物基礎產(chǎn)生大變形甚至失穩(wěn)的重要原因之一,因此研究不同圍壓下的巖石蠕變啟動應力和長期強度范圍對巖體工程施工設計具有重要的指導意義。此文主要采用實驗分析的方法并結合現(xiàn)有蠕變理論方法對實驗所獲得的曲線進行分析,分析找到該類巖石在不同圍壓下的蠕變啟動應力條件以及巖石軸徑向蠕變屈服閥值的應力范圍,并得到巖石蠕變啟動應力與軸徑向長期強度的一定規(guī)律。該文前述部分對巖石蠕變發(fā)生的微觀機理、巖石非線性蠕變的機理做了重要解釋,闡明了巖石蠕變發(fā)生內(nèi)部材料的微觀變化。利用不同圍壓下的室內(nèi)單軸、三軸壓縮實驗研究了巖石強度特征和變形變化,并求得了不同圍壓下的抗壓強度、彈性模量、泊松比以及花崗巖石的內(nèi)摩擦角及粘聚力等基本力學參數(shù),并分析了圍壓對各力學參數(shù)的影響關系。該文后述部分參照不同圍壓下的偏應力采用單體分級加載方式對花崗巖采用單軸、三軸蠕變實驗研究,獲得不同圍壓下一系列的軸向、徑向?qū)嶒炃�,并通過數(shù)據(jù)處理轉(zhuǎn)化成多種不同形式的軸徑向各變形匯總表、軸徑向蠕變速率曲線、軸徑向等時應力應變曲線來對比分析軸徑向蠕變特性,并分別確定每級圍壓下巖石蠕變啟動應力條件以及軸徑向蠕變長期強度范圍。對不同圍壓下的巖石蠕變起始應力、長期強度范圍作了比較分析,發(fā)現(xiàn)蠕變起始應力、長期強度隨著圍壓的變化,其強度值與瞬時最大偏應力的比值基本上會固定在一定的范圍內(nèi)。同時得到同級圍壓下巖石蠕變徑向長期強度值低于軸向長期強度值,并得到巖石長期強度應該以徑向穩(wěn)定蠕變閥值來確定。
[Abstract]:Rock creep is one of the important causes of large deformation and even instability in tunnel and underground engineering. Therefore, the study of rock creep starting stress and long-term strength range under different confining pressures is of great significance for rock engineering construction design. This paper mainly uses the experimental analysis method and the existing creep theory method to analyze the curve obtained from the experiment. The creep initiation stress conditions and the stress range of rock axial creep yield threshold under different confining pressures are found, and the certain rules of creep initiation stress and axial radial long-term strength of rock are obtained. In this paper, the microscopic mechanism of rock creep and the mechanism of rock nonlinear creep are explained, and the microscopic changes of internal materials are explained. The characteristics of rock strength and deformation were studied by uniaxial and triaxial compression experiments under different confining pressures, and the compressive strength and elastic modulus of rock under different confining pressures were obtained. Poisson's ratio, the angle of internal friction and cohesion of granitic rocks, and the influence of confining pressure on the mechanical parameters are analyzed. In this paper, a series of axial and radial experimental curves of granite under different confining pressures are obtained by using uniaxial and triaxial creep experiments, which refer to the deviant stress under different confining pressures. Through data processing, the creep characteristics of axial diameters are compared and analyzed by transforming them into various kinds of axial diametral deformation summary tables, axial radial creep rate curves and axial isochronous stress-strain curves. The creep starting stress conditions and the long term strength range of axial-radial creep are determined respectively under each confining pressure. The creep initial stress and long-term strength range of rock under different confining pressures are compared and analyzed. It is found that the creep initial stress and long-term strength change with confining pressure. The ratio of the strength value to the instantaneous maximum deflection stress is basically fixed in a certain range. At the same time, the radial long-term strength of rock creep under the same confining pressure is lower than that of axial long-term strength, and the long-term strength of rock should be determined by the radial stability creep threshold.
【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】：2013
【分類號】：TU45

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