【24h】

Investigation of the Mechanism of Fault Formation Using Bifurcation Analysis

机译:分叉分析研究故障形成机理

获取原文
获取原文并翻译 | 示例

摘要

We investigate a mechanism of fault formation by detecting the surface instability of ground using bifurcation analysis based on finite deformation theory. The bifurcation analysis is carried out in the case of a simple boundary value problem - the plane strain compression test of half-space made of incompressible isotropic and anisotropic hypo-elastic materials. Closed form solutions of bifurcation stress are obtained for many diffuse deformation modes defined by the number of the half wavelength of sine wave. The bifurcation stress of any diffuse deformation mode decreases with decreasing Young's modulus of horizontal direction compared to that of the vertical direction. In several diffuse modes, ground movement and the contour of maximum shear strain are examined to predict where fault formation occurs. The ground movements obtained by the bifurcation analysis show the surface instability of ground as sine waves, the amplitude of which decays rapidly with depth. In many cases, maximum shear strain is strongly localized beneath areas of ground sinking, due to bifurcation phenomenon. Moreover, comparatively large maximum shear strains appear in the deep parts of heaving grounds. The mechanism of fault formation can be explained using the distributions of localized maximum shear strains.
机译:我们通过基于有限变形理论的分叉分析来检测地面的表面不稳定性,从而研究断层形成的机制。在一个简单的边值问题的情况下进行分叉分析-由不可压缩的各向同性和各向异性次弹性材料制成的半空间的平面应变压缩试验。对于许多由正弦波的半波长数定义的扩散变形模式,可以获得分叉应力的闭合形式解。与垂直方向的杨氏模量相比,任何弥散变形模式的分叉应力都随着水平杨氏模量的减小而减小。在几种扩散模式下,将检查地面运动和最大剪切应变的轮廓,以预测断层形成的位置。通过分叉分析获得的地面运动显示出地面的表面不稳定性为正弦波,其振幅随深度而迅速衰减。在许多情况下,由于分叉现象,最大剪切应变强烈地位于地面下沉区域的下方。此外,较大的最大剪切应变出现在起伏地面的深部。断层形成的机理可以用局部最大剪切应变的分布来解释。

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