深部软岩温度—应力—化学三场耦合作用下蠕变规律研究

发布时间：2018-05-12 06:11

本文选题：温度-应力-化学耦合 + 蠕变特性　；参考：《青岛科技大学》2013年博士论文

【摘要】：深部软岩工程是地下工程中的瓶颈工程。深部岩体处于多场耦合的复杂地下环境：高温度、高应力以及化学腐蚀。这些物理化学场耦合作用,使得深部岩石表现出软岩的特性：大变形、强流变特性等特点,深部岩体工程也变得极不稳定,出现难支护等特点,给施工和人员安全造成严重威胁。因此,从岩石蠕变特性方面的研究来看,仅研究单一应力场以及两场耦合是远远不够的。因此,开展温度-应力-化学三场耦合作用下岩体蠕变特性的研究对预测岩体工程稳定性影响研究具有十分重要理论意义和实际工程价值。本文采用试验研究、理论分析与数值模拟相结合的方法。为了试验的顺利开展,创新地设计出了高温高压三轴环境试验箱,并利用ANSYS有限元分析软件对环境试验箱进行了结构分析,验证了设计的正确性；就温度-应力-化学三场耦合作用下深部岩石蠕变特性研究开展了系统的试验研究,分析了温度-应力-化学三场耦合作用下温度和化学腐蚀对深部岩石蠕变规律的影响效应,探讨了其作用机理；建立了考虑温度和化学pH值影响因素的深部岩石粘弹塑性非线性蠕变方程；建立了深部岩石的T-M-C耦合控制方程；根据实际工程背景,对山东唐口煤矿副井深部巷道进行了温度-应力-化学三场耦合作用下的数值模拟分析。论文的主要研究内容如下： 1、根据岩石实际地下环境确定了地下2000m深岩石所处环境参数,并根据材料力学和机械设计理论设计了三轴环境试验箱。利用Pro/E和ANSYS有限元分析软件相结合的方法对三轴环境试验箱进行了有限元分析,验证了设计的合理性。 2、开展了不同温度和不同化学pH值条件下的深部页岩蠕变特性的研究,分析了不同温度和不同pH值对深部页岩蠕变特性的影响规律,探讨了页岩的温度和化学pH值作用机理。 3、根据试验结果,对粘弹塑性元件组合模型进行了改进,模型的非线性部分是运用半线性元件改进半理论的方法：采用模型理论来描述线性流变部分,采用非线性元件来代替常规的线性元件来描述非线性流变部分,建立了能考虑温度和化学pH值影响因素的深部岩石粘弹塑性非线性蠕变模型。 4、以多孔介质力学为基础,建立了受温度场以及化学腐蚀作用影响的岩土介质的T-M-C三场耦合控制方程。提出了由水化学腐蚀孔隙度方程组,热弹性、各向同性热弹性和热弹塑性的三种情况下的岩石静力平衡方程,以及温度控制方程等构成的岩石T-M-C耦合控制方程。 5、以工程实例为背景,利用ANSYS有限元软件,对山东唐口煤矿副井深部巷道进行温度-应力-化学耦合作用下的蠕变特性进行数值模拟,分析了温度和化学pH值腐蚀对深部巷道围岩蠕变规律的影响。
[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.
【学位授予单位】：青岛科技大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU45

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