| 杨强,任继承,张浩.岩石中锚杆拔出试验的数值模拟[J].水利学报,2002,33(12):0068-0073 |
| 岩石中锚杆拔出试验的数值模拟 |
| Numerical simulation of the pullout of anchor in rock |
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| DOI： |
| 中文关键词: 格构模型 锚杆 脆性材料 非均质 开裂 |
| 英文关键词: lattice model anchor bristle material fracture crack heterogeneity |
| 基金项目: |
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| 中文摘要: |
| 采用二维格构模型分析了岩石中锚杆拔出试验。格构模型将材料在细观尺度上离散为由梁单元组成的格构系统。单元采用简单的本构关系和破坏准则，假定单元的抗拉强度服从正态分布，以引入岩石的非均质性。在外载作用下对整体网格进行线弹性分，计算出格构中各单元的局部应力，超过断裂阈值的单元将破坏，材料的开裂过程通过单元的依次破坏来模拟。研究中考察了材料非均质程度、约束条件对开裂机理的影响
。数值结果表明，非均匀性导致了开裂形态的非对称性，而增加水平约束后，试件的荷载-位移反应由脆性变为柔性。 |
| 英文摘要: |
| The pullout behavior of steel anchor embedded in rock is analyzed using lattice model.In the model the continuum is regarded as a connected lattice with elastic-bristle beam elements. Fracture is simulated by performing a linear elastic analysis of the lattice under loading and removing an element from the lattice that exceeds a certain breaking threshold. The breaking threshold is chosen randomly from normal distribution to incorporate material heterogeneities. The influence of heterogeneity and boundary conditions on final cracking patterns and load-displacement curves are investigated. It is concluded that the crack patterns and associated load-displacement response are significantly governed by the heterogeneity, load patterns and boundary conditions. |
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