论文中文题名: | 冻融与荷载联合作用下裂隙岩体损伤断裂特性研究 |
姓名: | |
学号: | 19104053002 |
保密级别: | 公开 |
论文语种: | chi |
学科代码: | 081401 |
学科名称: | 工学 - 土木工程 - 岩土工程 |
学生类型: | 博士 |
学位级别: | 工学博士 |
学位年度: | 2024 |
培养单位: | 西安科技大学 |
院系: | |
专业: | |
研究方向: | 岩土力学与工程 |
第一导师姓名: | |
第一导师单位: | |
论文提交日期: | 2024-12-10 |
论文答辩日期: | 2024-12-03 |
论文外文题名: | Study on Damage and Fracture Characteristics of Fractured Rock Mass under Combined Action of Freeze-Thaw Cycling and Loading |
论文中文关键词: | |
论文外文关键词: | Fractured Rock Mass ; Freeze-Thaw Environment ; Damage and Fracture ; Particle Tracking ; Hydrothermal Migration ; Frost Heave Force |
论文中文摘要: |
随着寒区工程建设的快速发展,在冻融环境下因裂隙岩体破裂失稳而诱发的地质灾害频发,尤其是在高寒地区,具有环境驱动性强和链式发展的冻融灾害严重威胁着寒区基础工程的安全稳定。本文以寒区裂隙岩体为研究对象,采用室内试验、理论分析和数值计算相结合的研究方法,运用粒子追踪法和热成像技术,构建了冻融裂隙岩体粒子追踪测速试验系统,开展了冻融作用下裂隙岩体水热迁移及相变冻胀特性的试验研究,完成了冻融与荷载联合作用下裂隙岩体特性试验,建立了荷载-冻融联合作用下裂隙岩体力学模型,获得了冻融与荷载联合作用下边缘裂隙周边/前缘处应力-位移解析,研究了冻融与荷载联合作用下裂隙岩体损伤断裂特性,完成的主要研究工作及结论如下: (1)运用粒子图像追踪原理,进行了裂隙岩体冻融过程的PIV实时追踪实验,实时直观地展现了常规测试方法无法观测的裂隙岩石和裂隙水的水热迁移过程,着重分析了冻融作用下裂隙岩体锋面运动特征、温度场和裂隙水流场变化特征,描述了岩石在水热迁移中冻结锋面移动速度以及温度变化规律。冻融裂隙岩体微水流场受温度变化影响:在冻结过程中,裂隙水流速急剧降低,而随着温度梯度的减弱裂隙水流速度趋于稳定;在融化过程中,裂隙中自由水随着裂隙冰的融化而增多,水流场呈现出明显的温度指向性。当裂隙岩体温度升至常温,粒子运动变得紊乱。所提出的PIV实时追踪测试方法能够实现裂隙水从微流场到宏观冻胀力的冻结全过程的动态描述。 (2)从微观角度研究了裂隙岩体在冻融循环过程中裂隙水相变特征,揭示了水-岩界面上裂隙冰成核→长大→裂隙壁晶核生长的过程及其生长方式和速度变化规律,分析了水-岩界面冰晶生长形态和冻胀力演化规律。阐明了冻融环境下裂隙岩体水热迁移过程和裂隙水相变的机制。探讨了温度梯度对晶核生长速度的影响,并开展了冻融损伤对裂隙岩体冻胀力和前缘应变的影响分析。研究发现:在冻结过程中,冻结锋面由下至上、由外向内呈扇形扩散,直至迁移至裂隙附近;融化过程中,岩体正立面的冻结锋面呈扇形向中下部发展收缩,直至消失。裂隙水相变的冻胀力演化规律可分为7个阶段:孕育阶段、陡升阶段、峰后下降阶段、稳定阶段、二次冻胀阶段、融化阶段以及完全消散阶段。 (3)研制了冻融与荷载联合作用下裂隙岩体损伤试验的压/剪荷载施加装置,完成了冻融受荷裂隙岩体损伤试验,重点分析了裂隙内部温度场、冻胀力及裂隙端部应变的演化规律,探讨了压缩荷载和剪切荷载对裂隙扩展的影响规律,研究了裂隙周边力学行为变化,揭示了冻融循环作用下裂隙岩体的冻胀损伤机制。研究表明:在整个冻融过程中冻胀变形对裂隙端部变形起主导作用;裂隙端部应变在冻融过程中以冻胀张拉为主,冻胀损伤以残余应变的形式不断累积,直至超过岩石强度极限,裂隙端部发生破坏变形。裂隙岩体的变形以冻胀为主,随着冻融循环次数的增加,冻胀损伤不断积累,直至裂隙失稳破坏。剪切荷载对裂隙岩体的冻胀损伤具有促进作用。随着冻融次数的增加,剪切荷载越大,裂隙前缘越早萌发宏观的冻胀−剪切裂纹,更易形成断裂失稳。 (4)考虑裂隙水相变力学演化特征和不同边界条件,提出了裂隙岩体前缘处冻融循环损伤断裂判据,建立了冻融受荷裂隙岩体力学模型,推导了冻融与荷载联合作用下边缘裂隙周边/前缘处应力-位移和裂隙扩展解析方程,求得了冻胀拉力和剪切力作用下Westergaard 应力函数以及应力-位移全场式,对岩体裂隙塑性区边界和岩体裂隙长度扩展进行了解析,与试验结果进行了验证分析。完成了冻胀力作用下岩体裂隙位移计算,揭示了裂隙岩体受荷破坏规律,实现了裂隙岩体力学指标的定量计算,为寒区岩石工程设计和施工提供基础数据。 (5)采用擅长模型缺陷部位网格划分兼具较高连续性检测精度的数值计算软件HyperWorks进行冻融受荷裂隙岩体损伤断裂性能研究,获得了室内试验难以捕捉的前缘处裂隙扩展至破坏的瞬间力场、位移场分布特征,深入探究冻融与荷载作用下裂隙前缘塑性区演化和裂隙扩展长度变化,分析了压/剪荷载作用下裂隙冻融破坏特征,验证了冻融与荷载联合作用下岩体裂隙断裂解析计算的可靠性,定量研究了地层压力、剪切力、冻胀拉力和剪力对前缘裂隙扩展的临界尺度和断裂尺度下限的影响规律,分析了荷载与冻结作用下裂隙表面位移演化规律,为高寒工程灾害防治研究提供科学依据。 |
论文外文摘要: |
With the rapid development of engineering construction in cold regions, geological disasters induced by the instability and failure of fractured rock masses in freeze-thaw environments have become frequent, especially in alpine regions. Freeze-thaw disasters, which are strongly environmentally driven and develop in a chain-like manner, pose a severe threat to the safety and stability of infrastructure projects in cold regions. This paper takes fractured rock masses in cold regions as the research object and adopts a research methodology that combines laboratory experiments, theoretical analysis, and numerical calculations. By utilizing particle tracking and thermal imaging techniques, a particle tracking and velocity measurement experimental system for fractured rock masses under freeze-thaw conditions is established. Innovative experimental research is conducted on the hydrothermal migration and frost heave characteristics of phase change in fractured rock masses under freeze-thaw action. Experiments on the characteristics of fractured rock masses under the combined action of freeze-thaw and loading are completed. A mechanical model for fractured rock masses under the combined action of loading and freeze-thaw is established. Analytical solutions for stress-displacement around/at the edge of fractures under the combined action of freeze-thaw and loading are obtained. The damage and fracture characteristics of fractured rock masses under the combined action of freeze-thaw and loading are investigated. The main research work and conclusions are as follows: (1)Using the principle of particle image velocimetry (PIV), real-time PIV tracking experiments are conducted on the freeze-thaw process of fractured rock masses. This visually and in real-time presents the hydrothermal migration process of fractured rock and fracture water that cannot be observed by conventional testing methods. The paper focuses on analyzing the characteristics of frontal movement, temperature field, and fracture water flow field changes in fractured rock masses under freeze-thaw action. It describes the movement speed of the freezing front and temperature change laws during hydrothermal migration in rock. The micro-water flow field of fractured rock masses under freeze-thaw conditions is affected by temperature changes: during the freezing process, the flow velocity of fracture water decreases sharply and then stabilizes as the temperature gradient weakens; during the thawing process, free water in the fractures increases as the fracture ice melts, and the water flow field exhibits a clear temperature directionality. When the temperature of the fractured rock mass rises to room temperature, particle movement becomes turbulent. The proposed PIV real-time tracking testing method enables dynamic description of the entire freezing process of fracture water from the micro-flow field to macroscopic frost heave forces. (2) The phase change characteristics of fracture water in fractured rock masses during freeze-thaw cycles are studied from a microscopic perspective. The process of fracture ice nucleation, growth, and crystal nucleus growth on fracture walls at the water-rock interface, as well as its growth mode and speed change laws, are revealed. The growth morphology of ice crystals at the water-rock interface and the evolution of frost heave forces are analyzed. The mechanisms of hydrothermal migration and fracture water phase change in fractured rock masses in freeze-thaw environments are clarified. The influence of temperature gradients on the growth rate of crystal nuclei is discussed, and an analysis of the impact of freeze-thaw damage on frost heave forces and strain at the leading edge of fractured rock masses is conducted. The study found that during the freezing process, the freezing front spreads in a fan shape from bottom to top and from outside to inside until it migrates near the fracture; during the thawing process, the freezing front on the front face of the rock mass develops and contracts in a fan shape towards the middle and lower parts until it disappears. The evolution of frost heave forces during the phase change of fracture water can be divided into seven stages: an incubation stage, a steep rise stage, a post-peak decline stage, a stable stage, a secondary frost heave stage, a thawing stage, and a complete dissipation stage. (3) A compression/shear loading application device for damage testing of fractured rock masses under the combined action of freeze-thaw and loading is developed. Damage experiments on fractured rock masses under freeze-thaw and loading conditions are completed. The evolution laws of the internal temperature field, frost heave forces, and strains at the ends of fractures are analyzed with emphasis. The influence laws of compressive and shear loads on fracture propagation are discussed. Changes in the mechanical behavior around fractures are studied, revealing the frost heave damage mechanism of fractured rock masses under freeze-thaw cycles. Research shows that frost heave deformation dominates the deformation at the ends of fractures throughout the freeze-thaw process; strain at the ends of fractures is mainly caused by frost heave tension during freeze-thaw cycles, and frost heave damage accumulates continuously in the form of residual strain until the rock strength limit is exceeded, resulting in damage and deformation at the ends of fractures. The deformation of fractured rock masses is dominated by frost heave. As the number of freeze-thaw cycles increases, frost heave damage accumulates until the fractures become unstable and fail. Shear loads promote frost heave damage in fractured rock masses. As the number of freeze-thaw cycles increases, the greater the shear load, the earlier macroscopic frost heave-shear cracks initiate at the fracture front, making it easier to form fracture instability. (4) Considering the mechanical evolution characteristics of fracture water phase change and different boundary conditions, a criterion for damage and fracture due to freeze-thaw cycles at the leading edge of fractured rock masses is proposed. A mechanical model for fractured rock masses under freeze-thaw and loading conditions is established. Analytical equations for stress-displacement and fracture propagation around/at the edge of fractures under the combined action of freeze-thaw and loading are derived. The Westergaard stress function and full-field stress-displacement equations under the action of frost heave tensile and shear forces are obtained. The boundaries of the plastic zone and the extension of fracture length in rock masses are analyzed and verified against experimental results. Calculations of fracture displacement in rock masses under frost heave forces are completed, revealing the failure laws of fractured rock masses under loading. Quantitative calculations of mechanical indicators for fractured rock masses are achieved, providing basic data for rock engineering design and construction in cold regions. (5) HyperWorks, a numerical calculation software that excels in mesh division for model defects and has high continuity detection accuracy, is used to study the damage and fracture properties of fractured rock masses under freeze-thaw and loading conditions. The instantaneous force field and displacement field distribution characteristics at the leading edge, where fractures propagate to failure, which are difficult to capture in laboratory experiments, are obtained. The evolution of the plastic zone at the fracture front and changes in fracture propagation length under the action of freeze-thaw and loading are deeply explored. The freeze-thaw failure characteristics of fractures under compression/shear loads are analyzed. The reliability of analytical calculations for fracture failure in rock masses under the combined action of freeze-thaw and loading is verified. The influence laws of formation pressure, shear force, frost heave tensile force, and shear force on the critical scale of fracture propagation at the leading edge and the lower limit of fracture scale are quantitatively studied. The evolution laws of fracture surface displacement under loading and freezing are analyzed, providing a scientific basis for research on the prevention and control of engineering disasters in alpine regions. |
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中图分类号: | TU458 |
开放日期: | 2024-12-17 |