【摘要】：深部巖體工程的長期穩(wěn)定性與圍巖的時(shí)效變形特性有著緊密的聯(lián)系,硬巖在高地應(yīng)力作用下會呈現(xiàn)出流變特性。采用TAW-2000巖石三軸試驗(yàn)機(jī),對花崗巖試件在三軸壓縮條件下進(jìn)行了蠕變特性試驗(yàn)。依據(jù)試驗(yàn)所得結(jié)果,通過理論與數(shù)值分析等手段,分析了花崗巖在蠕變過程中的變形規(guī)律、體積時(shí)效性變化特征以及蠕變破壞形式。結(jié)果表明：花崗巖在蠕變過程中總變形以瞬時(shí)變形為主,徑向比軸向更加具有時(shí)效變形特性；當(dāng)加載到破壞應(yīng)力時(shí),徑向與軸向變形之間呈現(xiàn)出近似線性變化規(guī)律,且徑向發(fā)生加速蠕變會提前于軸向,最終發(fā)生蠕變破壞的形式為脆性剪切破壞；花崗巖體積時(shí)效變形特征呈現(xiàn)出與花崗巖蠕變變形特征的同步性,在較高應(yīng)力水平持續(xù)作用時(shí),巖石內(nèi)部裂紋開始擴(kuò)展,導(dǎo)致擴(kuò)容現(xiàn)象產(chǎn)生,同時(shí)損傷開始演化積累,導(dǎo)致巖石內(nèi)部性能劣化；根據(jù)試驗(yàn)分析結(jié)果,基于西原模型和損傷理論構(gòu)建了非線性蠕變損傷模型,并利用最小二乘法對模型中的參數(shù)進(jìn)行了辨識,蠕變試驗(yàn)曲線與模型曲線的良好的吻合程度,驗(yàn)證了該非線性蠕變損傷模型對于巖石全過程蠕變特征描述的合理性和可行性。
[Abstract]:The long-term stability of deep rock mass engineering is closely related to the time-dependent deformation characteristics of surrounding rock, and the hard rock will show rheological characteristics under the action of high altitude stress. The creep properties of granite specimens under triaxial compression were tested by TAW-2000 rock triaxial testing machine. According to the experimental results and by means of theoretical and numerical analysis, the deformation law, the time-varying characteristics of volume and the forms of creep failure of granite during creep are analyzed. The results show that the total deformation of granite during creep is mainly instantaneous deformation, and the radial deformation is more age-dependent than axial deformation. When loading to the failure stress, there is an approximate linear variation law between radial deformation and axial deformation, and the radial accelerated creep will be ahead of the axial direction, and the ultimate creep failure form is brittle shear failure. The characteristics of granite volume aging deformation are synchronous with those of granite creep deformation. When the high stress level continues to act, the crack in the rock begins to expand, which leads to the expansion of capacity, and the damage begins to evolve and accumulate at the same time. It leads to the deterioration of the internal performance of the rock; According to the experimental results, the nonlinear creep damage model is constructed based on the Xiyuan model and damage theory, and the parameters in the model are identified by the least square method. The creep test curve is in good agreement with the model curve. The rationality and feasibility of the nonlinear creep damage model for describing the creep characteristics of rock during the whole process are verified.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU45

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