长江科学院院报 ›› 2016, Vol. 33 ›› Issue (12): 94-98.DOI: 10.11988/ckyyb.20150795

• 岩土工程 • 上一篇    下一篇

应力波入射滑移节理传播特性的数值模拟

饶宇,赵根,吴新霞,李鹏,胡英国,黎卫超   

  1. 长江科学院 水利部岩土力学与工程重点实验室,武汉 430010
  • 收稿日期:2015-09-17 出版日期:2016-12-20 发布日期:2016-12-13
  • 作者简介:饶 宇(1990-),男,湖南长沙人,助理工程师,硕士,主要从事岩土动力学方面的研究工作,(电话)027-82829793(电子信箱)raoyuray@163.com。
  • 基金资助:
    国家自然科学基金青年科学基金项目(51309026)

Stress Waves across Slip Joint

RAO Yu, ZHAO Gen, WU Xin-xia, LI Peng, HU Ying-guo, LI Wei-chao   

  1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2015-09-17 Published:2016-12-20 Online:2016-12-13

摘要: 基于弹性波理论,建立应力波入射滑移节理的数值模拟模型,并计算应力波的透射系数、反射系数和吸收系数,并据此研究应力波垂直入射滑移节理的传播特性。研究表明:纵波垂直入射滑移节理的传播特性主要受节理面的抗拉强度影响,当纵波产生的拉应力大于抗拉强度的瞬间,节理面产生分离而破坏,透射波瞬间消失,反射波增强,吸收能量增加,发生全反射;剪切波垂直入射滑移节理的传播特性主要受节理面的切向刚度与抗剪强度、等效切向刚度乘积的比值λ的影响,随着λ增大,反射波逐渐增强,透射波逐渐减弱,吸收能量先增大后减小,当λ足够大时,应力波在节理面处发生全反射而不产生透射。

关键词: 应力波传播, 滑移节理, 反射系数, 透射系数, 吸收系数, 能量, 数值模拟

Abstract: Based on the elastic wave theory, the numerical simulation model of stress waves across slipping joint has been built, and transmission, reflection and absorption coefficients are calculated to analyze the propagation characteristics of stress waves. Results show that propagation characteristics of normal incident longitudinal wave are affected by joint’s tensile strength, and if the tensile stress produced on the joint by normal incident longitudinal wave exceeds the tensile strength, the interface will separate, transmitted wave disappears instantaneously, and then total reflection occurs, with the reflected wave and absorbed energy increasing. The propagation characteristics of normal incident shear wave are affected by the ratio of tangential joint stiffness and the product of shear strength and normalized tangential joint stiffness. With the increasing of the ratio, the reflection coefficient increases, transmission coefficient decreases, and absorption coefficient increases at first and then decreases, then ends with total reflection.

Key words: stress waves propagation, slip joint, reflection coefficient, transmission coefficient, absorption coefficient, energy, numerical simulation

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