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Material Sciences 2022
含孔洞圆盘试样裂纹扩展规律的物模和数模分析
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Abstract:
孔洞是岩石等地质材料中典型的天然缺陷，对岩体承载力和裂纹扩展具有重要影响。通过实验和数值模拟研究了包含单个圆孔或多个不同直径圆孔的特制混凝土圆盘试样中的裂纹扩展过程。圆盘试样是由硅酸盐水泥、细砂和水混合制备而成。首先对含单孔圆盘试样的承载力进行了实测分析；接着对含单孔和多孔圆盘试样的裂纹扩展模式进行了实验研究，分析了裂纹的起裂及贯通过程，再现了孔洞缺陷对裂缝扩展模式的影响；最后，通过改进的高阶位移不连续方法进行含孔洞圆盘试样的劈裂过程数值模拟，进一步揭示了孔洞缺陷对应力集中和裂纹扩展的主导作用，数值结果与物理实验结果吻合较好。
The hole is a typical natural defect in rock and other geological materials, which has an important influence on bearing capacity and crack propagation of rock mass. The crack propagation process in a special concrete disk specimen containing a single circular hole or several circular holes with different diameters is studied by experiments and numerical simula-tions. The disc sample is prepared by mixing portland cement, fine sand and water. Firstly, the bearing capacity of disk specimens with a single hole is measured and analyzed. Then, the crack propagation mode of single-hole and porous disk specimens is studied experimentally, the crack in-itiation and penetration process are analyzed, and the influence of hole defects on crack propaga-tion mode is reproduced. Finally, the improved high-order displacement discontinuity method is used to simulate the splitting process of disk specimens with holes, which further reveals the lead-ing role of hole defects in stress concentration and crack propagation. The numerical results are in good agreement with the physical experimental results.
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