深部高应力软岩巷道时效变形机理研究
发布时间：2019-05-24 22:55
【摘要】：在深部开采环境下,巷道围岩体通常表现出显著的高地压、大变形、长时间持续流变等特性,给深部巷道的支护与维护问题带来了严峻的挑战。研究深部高应力软岩巷道围岩时效变形机制,对于保障深部巷道围岩长期稳定具有十分重要的意义。本文综合运用理论分析、数值模拟与现场监测相结合的方法,深入研究了深部高应力软岩巷道围岩的时效变形过程及失稳机理,主要研究成果如下:(1)基于经典的流变力学与塑性力学理论,建立了一种由Burgers流变模型和线性应变软化模型串联的软岩黏弹塑性应变软化蠕变力学模型,并推导了相应的三维蠕变本构方程。与传统的软岩蠕变模型相比,该模型能够很好的表征软岩第三阶段的加速蠕变特性。(2)在FLAC3D内置Cvisc蠕变模型的基础上,对建立的软岩黏弹塑性应变软化蠕变模型进行了二次开发。运用自定义开发的软岩黏弹塑性应变软化蠕变程序,建立了软岩三轴压缩蠕变试验数值计算模型,分析了软岩峰后应变软化特征和蠕变变形规律,数值模拟结果与实验结果基本吻合,证明了建立的软岩黏弹塑性应变软化模型的有效性。(3)基于自定义开发的软岩黏弹塑性应变软化蠕变分析程序,运用FLAC3D建立了深部高应力软岩巷道三维数值计算模型,深入研究了不同地应力环境下软岩巷道围岩变形、应力、塑性区等随着时间的演化规律,揭示了深部高应力软岩巷道围岩的时效变形过程及失稳机理。(4)以某矿-1000m水平大巷的具体工程地质条件为背景,运用自定义开发的黏弹塑性应变软化蠕变分析程序,研究了该巷道在原支护方案下锚杆受力变化、围岩变形及围岩塑性区扩展随时间的变化规律,并针对该巷道围岩的时效变形破坏特征,提出了以锚注为核心的耦合支护体系,有效地控制了该巷道围岩的剧烈流变,确保了巷道围岩的长期稳定。
[Abstract]:In the deep mining environment, the surrounding rock mass of roadway usually shows obvious high ground pressure, large deformation, long time continuous flow and other characteristics, which brings severe challenges to the support and maintenance of deep roadway. It is of great significance to study the aging deformation mechanism of surrounding rock of deep high stress soft rock roadway to ensure the long-term stability of surrounding rock of deep roadway. In this paper, the aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are deeply studied by using the method of theoretical analysis, numerical simulation and field monitoring. The main research results are as follows: (1) based on the classical theory of Rheology and plasticity, a viscous elastic-plastic strain-softened creep mechanical model of soft rock is established, which is composed of Burgers Rheological Model and Linear strain softened Model. The corresponding three-dimensional creep constitutive equation is derived. Compared with the traditional soft rock creep model, this model can well characterize the accelerated creep characteristics of the third stage of soft rock. (2) on the basis of FLAC3D built-in Cvisc creep model, The Visco-elastic-plastic strain softened creep model of soft rock was developed. The numerical calculation model of triaxial compression creep test of soft rock is established by using the Visco-elastic-plastic strain softened creep program of soft rock, and the strain softened characteristics and creep deformation law of soft rock after peak are analyzed. The numerical simulation results are in good agreement with the experimental results, which proves the effectiveness of the established Visco-elastic-plastic strain softening model for soft rock. (3) based on the self-developed program for the analysis of viscous elastic-plastic strain softened creep of soft rock, The three-dimensional numerical calculation model of deep high stress soft rock roadway is established by using FLAC3D, and the evolution law of surrounding rock deformation, stress and plastic zone with time under different ground stress environment is deeply studied. The aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are revealed. (4) based on the specific engineering geological conditions of a mine-1000m horizontal roadway, a custom developed Visco-elastic-plastic strain softened creep analysis program is used. The variation of bolt force, deformation of surrounding rock and expansion of plastic zone of surrounding rock with time are studied under the original supporting scheme. According to the aging deformation and failure characteristics of surrounding rock of the roadway, a coupling support system with anchor and grouting as the core is put forward. The violent flow of the surrounding rock of the roadway is effectively controlled and the long-term stability of the surrounding rock of the roadway is ensured.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
本文编号：2485256
[Abstract]:In the deep mining environment, the surrounding rock mass of roadway usually shows obvious high ground pressure, large deformation, long time continuous flow and other characteristics, which brings severe challenges to the support and maintenance of deep roadway. It is of great significance to study the aging deformation mechanism of surrounding rock of deep high stress soft rock roadway to ensure the long-term stability of surrounding rock of deep roadway. In this paper, the aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are deeply studied by using the method of theoretical analysis, numerical simulation and field monitoring. The main research results are as follows: (1) based on the classical theory of Rheology and plasticity, a viscous elastic-plastic strain-softened creep mechanical model of soft rock is established, which is composed of Burgers Rheological Model and Linear strain softened Model. The corresponding three-dimensional creep constitutive equation is derived. Compared with the traditional soft rock creep model, this model can well characterize the accelerated creep characteristics of the third stage of soft rock. (2) on the basis of FLAC3D built-in Cvisc creep model, The Visco-elastic-plastic strain softened creep model of soft rock was developed. The numerical calculation model of triaxial compression creep test of soft rock is established by using the Visco-elastic-plastic strain softened creep program of soft rock, and the strain softened characteristics and creep deformation law of soft rock after peak are analyzed. The numerical simulation results are in good agreement with the experimental results, which proves the effectiveness of the established Visco-elastic-plastic strain softening model for soft rock. (3) based on the self-developed program for the analysis of viscous elastic-plastic strain softened creep of soft rock, The three-dimensional numerical calculation model of deep high stress soft rock roadway is established by using FLAC3D, and the evolution law of surrounding rock deformation, stress and plastic zone with time under different ground stress environment is deeply studied. The aging deformation process and instability mechanism of surrounding rock of deep high stress soft rock roadway are revealed. (4) based on the specific engineering geological conditions of a mine-1000m horizontal roadway, a custom developed Visco-elastic-plastic strain softened creep analysis program is used. The variation of bolt force, deformation of surrounding rock and expansion of plastic zone of surrounding rock with time are studied under the original supporting scheme. According to the aging deformation and failure characteristics of surrounding rock of the roadway, a coupling support system with anchor and grouting as the core is put forward. The violent flow of the surrounding rock of the roadway is effectively controlled and the long-term stability of the surrounding rock of the roadway is ensured.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
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