• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Boundaries of Rock Mechanics: Recent Advances and Challenges for the 21st Century >Numerical simulation of acoustic emission and strain energy decrease of rock specimens with different degrees of pre-existing random imperfections
【24h】

Numerical simulation of acoustic emission and strain energy decrease of rock specimens with different degrees of pre-existing random imperfections

机译：随机存在不同程度缺陷的岩石试件声发射和应变能下降的数值模拟

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Four rock specimens in plane strain compression are modelled numerically by use of FLAC. One is homogeneous specimen; the others include pre-existing material imperfections whose positions are randomly selected. The intact rock firstly obeys linear strain-softening behaviour followed by ideal plastic behaviour once the stress acting on the element reaches the shear strength controlled by cohesion and the internal friction angle.The intact rock obeys a Mohr-Coulomb criterion with tension cut-off. Initial imperfections undergo ideal plastic behaviour at the onset of failure and possess non-zero tensile strength equal to the tensile strength of the intact rock. Five custom written FISH functions are used to prescribe the initially random material imperfections and to calculate the acoustic emission counts, the accumulated acoustic emission counts, the elastic strain energy decrease rate and the total elastic strain energy decrease. The numerical results show that specimens with imperfections can model the actual failure processes (including the imperfection extension and coalescence and the combination of shorter fractures to form longer through-going fractures) of rocks, while the homogeneous specimen cannot. The influence of imperfection density is also explored.
机译：使用FLAC对四个岩石样品进行了平面应变压缩建模。一种是均质样品；另一种是均质样品。其他包括位置随机选择的预先存在的材料缺陷。一旦作用在单元上的应力达到由内聚力和内摩擦角控制的抗剪强度，完整岩石首先服从线性应变软化行为，然后遵循理想的塑性行为。完整岩石遵循具有拉力截止值的Mohr-Coulomb准则。初始缺陷在破坏开始时会经历理想的塑性行为，并具有等于完整岩石的拉伸强度的非零拉伸强度。使用五个自定义编写的FISH函数来规定最初随机的材料缺陷，并计算声发射计数，累积声发射计数，弹性应变能下降率和总弹性应变能下降。数值结果表明，具有缺陷的试样可以模拟岩石的实际破坏过程（包括缺陷的扩展和合并以及较短的裂缝的组合以形成较长的贯穿的裂缝），而均匀试样则不能。还探讨了缺陷密度的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号