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Numerical simulation analysis of energy evolution law and distribution characteristics of anchored body unidirectional loading
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.tust.2025.106419
Xue-kui Xin, Qing-bin Meng, Hai Pu, Jiang-yu Wu

Energy serves as the fundamental driver of material failure, and accurately describing the mechanical properties and energy evolution laws of loaded anchored body is crucial for the stability control of surrounding rock in bolt-supported roadways. Based on uniaxial compression tests of rock samples and utilizing the embedded Fish programming language in FLAC3D, numerical models of loaded sandstone specimens and energy models were developed. Through a comparative analysis between FLAC3D numerical simulations and laboratory uniaxial compression test results, the rationality of the energy model was validated, and post-peak strength parameters for the anchored body were established. Employing the PILE and LINER structural elements within FLAC3D, models for pre-stress diffusion in anchor bolts and energy evolution in anchored body were constructed. These models explored the distribution characteristics of tensile and compressive stress zones within anchored body during pre-stress release, as well as the pressure arch effect. Furthermore, the fracture behavior of anchored body and bolt load characteristics under different support and drilling size and density conditions were analyzed. The study revealed the evolution and distribution patterns of total energy density, elastic energy density and dissipated energy density during both the pre-peak and post-peak stages of anchored body. The mechanical effects and energy evolution laws of anchored body and bolts exhibit distinct stage − specific characteristics.

中文翻译:


锚固体单向载荷能量演化规律及分布特性数值模拟分析



能量是材料失效的根本驱动因素,准确描述加载锚固体的力学性能和能量演化规律对于螺栓支撑巷道中围岩的稳定性控制至关重要。基于岩石样品的单轴压缩试验,并利用 FLAC3D 中嵌入的 Fish 编程语言,开发了加载砂岩样品的数值模型和能量模型。通过FLAC3D数值模拟与室内单轴压缩试验结果的对比分析,验证了能量模型的合理性,建立了锚固体的峰后强度参数。利用 FLAC3D 中的 PILE 和 LINER 结构单元,构建了锚固螺栓中的预应力扩散和锚固体中的能量演变模型。这些模型探讨了预应力释放过程中锚固体内拉伸和压缩应力区的分布特征,以及压力拱效应。此外,分析了不同支护和钻孔尺寸和密度条件下锚固体的断裂行为和锚杆载荷特性。该研究揭示了锚定体峰前和峰后阶段总能量密度、弹性能量密度和耗散能量密度的演变和分布模式。锚固体和螺栓的机械效应和能量演化规律表现出不同的阶段 - 特定特征。
更新日期:2025-01-23
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