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  本文選題：非飽和砂巖　切入點：蠕變模型　出處：《遼寧工程技術(shù)大學》2015年碩士論文　論文類型：學位論文

【摘要】：一直以來地下工程的穩(wěn)定性、安全性都是實際工程中不可忽視的,巖石所處環(huán)境的復雜性、擾動性使深部巖體變現(xiàn)出情況各異的流變特性。鑒于此,對巖石的蠕變特性的研究也是長期以來學者們的研究熱點,巖石蠕變理論的研究至今還有待完善,當前對巖石蠕變模型的研究仍然是難點。選取砂巖為研究對象,對其進行基本的物理力學實驗研究,獲得密度,含水率等物理參數(shù)；進行X衍射試驗研究,對其內(nèi)部的化學成分進行研究分析；采用TAW-2000電液伺服巖石三軸儀對非飽和條件和干燥條件下巖石試件進行常規(guī)三軸壓縮試驗,獲得粘聚力、內(nèi)摩擦角、抗壓強度、長期強度、屈服強度等參數(shù),為蠕變試驗提供可靠依據(jù)。最后進行非飽和和干燥砂巖的不同圍壓下三軸蠕變對比試驗研究,依據(jù)試驗所得結(jié)果分析圍壓、軸壓、水等對試件蠕變變形的影響、變形規(guī)律以及蠕變破壞形式等。在分析巖石蠕變?nèi)^程的基礎上,加入非線性黏壺元件,同其他基本元件串并聯(lián)疊加組合,構(gòu)建一個能夠很好的反應非飽和砂巖蠕變?nèi)^程的新模型；模型中的參數(shù)由origin軟件采用最小二乘法辨識確認,擬合曲線變化規(guī)律與實測曲線擬合度較高,驗證了該非線性蠕變模型對于非飽和砂巖蠕變?nèi)^程特征描述的合理性和可行性,為實際工程提供理論依據(jù)。
[Abstract]:The stability and safety of underground engineering have always been unneglectable in practical engineering. The complexity and disturbance of the rock environment make the deep rock mass have different rheological characteristics. The research on creep characteristics of rock is also a hot topic for many scholars for a long time. The study of creep theory of rock remains to be perfected, and the study of creep model of rock is still difficult. The sandstone is chosen as the object of study. The physical parameters such as density and moisture content were obtained by the basic physical and mechanical experiments, and the internal chemical composition was studied by X-ray diffraction test. The conventional triaxial compression tests of rock specimens under unsaturated and dry conditions were carried out by using TAW-2000 electro-hydraulic servo rock triaxial apparatus. The parameters such as cohesion, angle of internal friction, compressive strength, long-term strength and yield strength were obtained. Finally, a comparative study of triaxial creep under different confining pressures of unsaturated and dry sandstone is carried out, and the effects of confining pressure, axial pressure and water on creep deformation of specimens are analyzed based on the experimental results. On the basis of analyzing the whole process of rock creep, the nonlinear bonding pot element is added and combined with other basic elements in series and parallel. A new model which can well reflect the whole creep process of unsaturated sandstone is constructed, and the parameters in the model are identified by the origin software using the least square method, and the variation law of the fitting curve is higher than that of the measured curve. It is verified that the nonlinear creep model is reasonable and feasible for describing the characteristics of the whole creep process of unsaturated sandstone, which provides a theoretical basis for practical engineering.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU45

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