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首页> 外文学位 >Nonlinear boundary element analysis of a rock mass with discontinuities.
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Nonlinear boundary element analysis of a rock mass with discontinuities.

机译：具有不连续性的岩体的非线性边界元分析。

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摘要

A boundary element model was developed for stress/stability analysis of underground excavations in the vicinity of faults. The boundary element formulation adopts the Fictitious Stress Method for the simulation of excavation boundaries and the Displacement Discontinuity Method for the representation of faults. With the assumption that deformations and stress changes can generally be attributed to the presence of faults rather than to elastoplasticity of the rock mass, the numerical model employed a linear elastic constitutive relation for the rock, and nonlinear behaviour for the fault. This assumption is particularly justified in hard rock environment. Following a comprehensive review of constitutive models for rock joints, both deformation and peak strength models were incorporated for modelling the mechanical behaviour of the fault. Deformation or stiffness models include Goodman's constant stiffness model and Barton-Bandis' nonlinear model. The latter, considers the effect of a wide range of parameters such as coupling between shear and normal stresses and displacement, joint closure, joint separation, hardening followed by postpeak or residual behaviour. Peak strength models include Mohr-Coulomb and Barton-Bandis which employs a mobilized nonlinear shear strength envelope. An incremental, in situ stress relaxation algorithm is developed and implemented for the nonlinear analysis of the faults.;Model verification was done by a comparison of its predictions with previously published results found in the literature. The comparison showed excellent agreement. A model sensitivity analysis was then carried out to compare the response of different discontinuity models. A case study of an underground hard rock mine was conducted to examine the stability of a mining ore zone intersected by faults.;A user friendly graphical interface was developed to help generate the data and interpret the output results more efficiently.
机译：建立了边界元模型，用于断层附近地下挖掘的应力/稳定性分析。边界元公式采用虚拟应力法模拟开挖边界，采用位移不连续法表示断层。假设变形和应力变化通常可归因于断层的存在而不是岩体的弹塑性，数值模型对岩石采用线性弹性本构关系，对断层采用非线性行为。该假设在硬岩环境中特别合理。在对岩石节理的本构模型进行了全面回顾之后，结合了变形和峰值强度模型来对断层的力学行为进行建模。变形或刚度模型包括Goodman常数刚度模型和Barton-Bandis非线性模型。后者考虑了各种参数的影响，例如剪切应力与法向应力与位移之间的耦合，接头闭合，接头分离，硬化以及随后的峰值或残余行为。峰值强度模型包括Mohr-Coulomb和Barton-Bandis，它们采用了动员的非线性剪切强度包络线。开发了一种增量式原位应力松弛算法，并将其用于故障的非线性分析。;通过将其预测结果与文献中先前发表的结果进行比较，进行了模型验证。比较显示出极好的一致性。然后进行模型敏感性分析以比较不同间断模型的响应。以地下硬岩矿为例，研究了断层相交的矿区的稳定性。开发了用户友好的图形界面，可帮助生成数据并更有效地解释输出结果。

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  • 作者

    Fotoohi, Keyvan.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Mining.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 319 p.
  • 总页数 319
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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