本文選題：溫度-應力-化學耦合 + 蠕變特性��； 參考：《青島科技大學》2013年博士論文

【摘要】：深部軟巖工程是地下工程中的瓶頸工程。深部巖體處于多場耦合的復雜地下環(huán)境：高溫度、高應力以及化學腐蝕。這些物理化學場耦合作用,使得深部巖石表現(xiàn)出軟巖的特性：大變形、強流變特性等特點,深部巖體工程也變得極不穩(wěn)定,出現(xiàn)難支護等特點,給施工和人員安全造成嚴重威脅。因此,從巖石蠕變特性方面的研究來看,僅研究單一應力場以及兩場耦合是遠遠不夠的。因此,開展溫度-應力-化學三場耦合作用下巖體蠕變特性的研究對預測巖體工程穩(wěn)定性影響研究具有十分重要理論意義和實際工程價值。 本文采用試驗研究、理論分析與數(shù)值模擬相結合的方法。為了試驗的順利開展,創(chuàng)新地設計出了高溫高壓三軸環(huán)境試驗箱,并利用ANSYS有限元分析軟件對環(huán)境試驗箱進行了結構分析,驗證了設計的正確性；就溫度-應力-化學三場耦合作用下深部巖石蠕變特性研究開展了系統(tǒng)的試驗研究,分析了溫度-應力-化學三場耦合作用下溫度和化學腐蝕對深部巖石蠕變規(guī)律的影響效應,探討了其作用機理；建立了考慮溫度和化學pH值影響因素的深部巖石粘彈塑性非線性蠕變方程；建立了深部巖石的T-M-C耦合控制方程；根據(jù)實際工程背景,對山東唐口煤礦副井深部巷道進行了溫度-應力-化學三場耦合作用下的數(shù)值模擬分析。 論文的主要研究內容如下： 1、根據(jù)巖石實際地下環(huán)境確定了地下2000m深巖石所處環(huán)境參數(shù),并根據(jù)材料力學和機械設計理論設計了三軸環(huán)境試驗箱。利用Pro/E和ANSYS有限元分析軟件相結合的方法對三軸環(huán)境試驗箱進行了有限元分析,驗證了設計的合理性。 2、開展了不同溫度和不同化學pH值條件下的深部頁巖蠕變特性的研究,分析了不同溫度和不同pH值對深部頁巖蠕變特性的影響規(guī)律,探討了頁巖的溫度和化學pH值作用機理。 3、根據(jù)試驗結果,對粘彈塑性元件組合模型進行了改進,模型的非線性部分是運用半線性元件改進半理論的方法：采用模型理論來描述線性流變部分,采用非線性元件來代替常規(guī)的線性元件來描述非線性流變部分,建立了能考慮溫度和化學pH值影響因素的深部巖石粘彈塑性非線性蠕變模型。 4、以多孔介質力學為基礎,建立了受溫度場以及化學腐蝕作用影響的巖土介質的T-M-C三場耦合控制方程。提出了由水化學腐蝕孔隙度方程組,熱彈性、各向同性熱彈性和熱彈塑性的三種情況下的巖石靜力平衡方程,以及溫度控制方程等構成的巖石T-M-C耦合控制方程。 5、以工程實例為背景,利用ANSYS有限元軟件,對山東唐口煤礦副井深部巷道進行溫度-應力-化學耦合作用下的蠕變特性進行數(shù)值模擬,分析了溫度和化學pH值腐蝕對深部巷道圍巖蠕變規(guī)律的影響。
[Abstract]:Deep soft rock engineering is a bottleneck in underground engineering. Deep rock mass is in complex underground environment with multiple field coupling: high temperature, high stress and chemical corrosion. The coupling of physical and chemical fields makes the deep rock show the characteristics of soft rock, such as large deformation, strong rheology and so on, and the deep rock mass engineering becomes extremely unstable and difficult to support. Pose a serious threat to construction and personnel safety. Therefore, it is far from enough to study the single stress field and the coupling of two fields from the point of view of the creep characteristics of rock. Therefore, it is of great theoretical significance and practical engineering value to study the creep characteristics of rock mass under temperature-stress-chemistry coupling in order to predict the stability of rock mass engineering. In this paper, experimental research, theoretical analysis and numerical simulation are combined. In order to carry out the test successfully, a triaxial environmental test box with high temperature and high pressure was designed, and the structure of the test box was analyzed by using ANSYS finite element analysis software, and the correctness of the design was verified. The creep characteristics of deep rock under the coupling of temperature, stress and chemistry are studied systematically. The effects of temperature and chemical corrosion on the creep behavior of deep rock under the coupling of temperature, stress and chemistry are analyzed. The mechanism is discussed, the nonlinear creep equation of viscoelastic-plastic in deep rock considering the influence of temperature and chemical pH value is established, the T-M-C coupling control equation of deep rock is established, according to the actual engineering background, the nonlinear creep equation of viscoelastic-plastic in deep rock is established. The numerical simulation and analysis of the deep roadway in the auxiliary shaft of Tangkou Coal Mine, Shandong Province, under the coupling of temperature, stress and chemistry are carried out. The main contents of this thesis are as follows: 1. According to the actual underground environment of rock, the environmental parameters of 2000m deep rock are determined, and the triaxial environmental test box is designed according to material mechanics and mechanical design theory. The finite element analysis of the triaxial environmental test box is carried out by using Pro/E and ANSYS finite element analysis software, and the rationality of the design is verified. 2. The creep characteristics of deep shale at different temperatures and different chemical pH values were studied. The effects of different temperatures and pH values on the creep characteristics of deep shale were analyzed, and the mechanism of shale temperature and chemical pH values were discussed. 3. According to the experimental results, the viscoelastic-plastic element combination model is improved. The nonlinear part of the model is the method of using semi-linear element to improve the semi-theory: the model theory is used to describe the linear rheological part. Nonlinear element is used to describe the nonlinear rheological part instead of the conventional linear element. A viscoelastic-plastic nonlinear creep model of deep rock considering the influence of temperature and chemical pH value is established. 4. Based on the mechanics of porous media, the T-M-C three-field coupling governing equation of rock and soil media affected by temperature field and chemical corrosion is established. The rock static equilibrium equations under the three conditions of hydrochemical corrosion porosity equation, thermoelasticity, isotropic thermoelasticity and thermoelastoplasticity, as well as the T-M-C coupling governing equation of rock temperature are presented in this paper, which are composed of hydrochemical corrosion porosity equations, thermoelastic equations, isotropic thermoelastic equations and thermoelastic-plastic equations. 5. Taking the engineering example as the background, the creep characteristics of the deep roadway in the auxiliary shaft of Tangkou Coal Mine in Shandong Province under the coupling of temperature, stress and chemistry are numerically simulated by using ANSYS finite element software. The influence of temperature and chemical pH corrosion on the creep of deep roadway surrounding rock is analyzed.
【學位授予單位】：青島科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU45

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