水-力耦合下类岩材料相邻裂纹时效扩展和节理岩体本构模型、多物理场耦合岩石变形近场动力学模型
水-力耦合作用下类岩石材料中相邻裂纹的时效扩展及相互作用
摘要内容
在渗流压力和地应力的长期耦合作用下，岩体中裂纹的相互作用和扩展呈现出典型的时效特征，这种特征直接控制着岩体的破坏模式，本研究以含相邻预制裂纹的水泥砂浆试件为研究对象，开展了长期水-力耦合室内试验，利用低频核磁共振技术分析了试件中微裂纹的演化规律，进行了相应的数值模拟，并研究了相邻裂纹的扩展和相互作用以及岩石蠕变破坏的时效机制。研究结果表明：含相邻裂隙岩体的蠕变破坏呈现拉剪复合破坏模式，宏观断裂是由单条裂纹扩展形成的，与相邻裂纹不连通；由于裂纹间的相互作用效应，试件内部形成了大量微裂纹，相邻预制裂纹的扩展不均匀，主裂纹的上下翼裂纹扩展不对称；在裂纹萌生阶段，裂纹扩展受剪切断裂模式的控制，相互作用表现为对相邻裂纹的抑制；在扩展到一定程度后，主裂纹扩展受拉伸断裂模式的控制，其扩展速率增加，加速了岩体的破坏。
图1 含相邻预制裂纹水泥砂浆试件的制作过程
图3 相邻裂纹随时间的扩展和相互作用模式: (a) 基本扩展模式; (b) 扩展过程
图4 断裂参数沿相邻裂纹前缘的分布和变化: (a) KI; (b) KII; (c) KIII; (d) Ke
文献信息
J. Mei, X. Sheng, L. Yang, Y. Zhang, H. Yu, W. Zhang. Time-dependent propagation and interaction behavior of adjacent cracks in rock-like material under hydro-mechanical coupling. Theoretical and Applied Fracture Mechanics, 2022, 122: 103618. DOI: 10.1016/j.tafmec.2022.103618.
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多物理场耦合作用下岩石材料变形与破坏的近场动力学模型
摘要内容
本文提出了一种热-水-力耦合的近场动力学(PD)模型，用于模拟岩石材料在多物理场耦合作用下的变形和破坏以及流动和温度扩散，该研究利用近场动力学最小二乘(PD-LSM)方法，将热-力耦合、水-力耦合、热-水-力耦合作用下的热传导和流动扩散方程细化为PD形式，并在基于键的PD模型框架下建立了热-水-力耦合的运动方程。通过对比稳态导热、热变形、瞬态流动、水力压裂、热固结和考虑热效应的水力压裂等问题的解析解和数值结果，本文验证了耦合PD模型的有效性，对比结果表明，本文所提出的热-水-力耦合PD模型能较好地反映岩石材料在多物理场耦合作用下的变形破坏过程。
图2 PD与FEM的温度对比
图3 (a) THM热-水-力耦合, (b) HM水-力耦合, (c) TM热-力耦合 的裂纹扩展
文献信息
Y. Zhang, S. Yu, H. Deng.Peridynamic model of deformation and failure for rock material under the coupling effect of multi-physical fields. Theoretical and Applied Fracture Mechanics, 2023, 125: 103912. DOI: 10.1016/j.tafmec.2023.103912.
水-力耦合作用下节理岩体的损伤本构模型及力学特性
摘要内容
水-力耦合作用下节理岩体的损伤演化规律和力学性能弱化机制是深部岩体开挖中的重要科学问题，本文分析了岩石试件的矿物成分，研究了花岗岩在不同轴向应力下的核磁共振T2谱分布规律，研究了节理岩样在三轴应力和渗透压力作用下的力学特性，本文通过对节理尖端应力场的分析建立了节理岩体的损伤模型，并对损伤变量张量进行了分析，计算了渗透压力作用下的应力强度因子。渗流压力促进了节理岩体试件的损伤演化过程，加速了节理岩体试件的强度破坏，本文建立并验证了渗透压力作用下节理岩体的损伤本构模型，基于渗流压力弱化规律，本文定制开发了水-力耦合本构模型，并以Mohr-Coulomb本构模型计算函数为编译模板将其导入FLAC3D中，本文还建立了地下岩体工程三维数值模拟模型，分析了不同节理倾角下岩体的稳定性。
图2 不同节理倾角下不同试件的力学特性
图3 破碎围岩巷道计算模型
图4 节理岩体中巷道的主应力
文献信息
https://www.sciencedirect.com/science/article/pii/S0167844222004840
（2023年,第492卷）
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