应力波入射黏弹性节理的传播特性研究

饶宇; 赵根; 吴新霞; 夏元友; 刘美山

doi:10.11779/CJGE201612012

应力波入射黏弹性节理的传播特性研究 English Version

饶宇^{1, 2},
赵根¹,
吴新霞¹,
夏元友^2, ,,
刘美山¹

1. 长江科学院水利部岩土力学与工程重点实验室,湖北武汉 430010;
2. 武汉理工大学,湖北武汉 430070

基金项目: 国家自然科学基金项目（51374163）; 国家自然科学基金青年科学基金项目（51309026）

详细信息

作者简介:
饶宇(1990-),男,硕士,主要从事岩土动力学等方面的科研工作。E-mail: raoyuray@163.com。

通讯作者:
夏元友，E-mail：xiayy1965@126.com

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出版历程
- 收稿日期: 2015-10-21
- 发布日期: 2016-12-24

Propagation characteristics of stress waves across viscoelastic joints

1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China;
2. Wuhan University of Technology, Wuhan 430070, China

摘要

摘要: 应力波传播特性的研究是进行工程动态稳定性评价的基础。依托柱状节理玄武岩开挖爆破试验,考虑节理岩体的蠕变和应力松弛特性,提出了黏弹性节理的等效标准线性固体模型,采用“位移不连续理论”,获得了应力波入射黏弹性节理的传播方程,并探讨了应力波入射黏弹性节理的传播规律。透射系数随入射波频率的增大而减小,而反射系数整体上呈现出随频率的增大而增大的趋势。在临界入射角内,随入射角度增大,转换波（T_sp,T_ps,R_sp和R_ps）均先增大后减小且转换波的透射系数（T_sp和T_ps）最小,反射同类型波（Rss或Rpp）先减小后增大,透射同类型波（Tss或Tpp）则基本没有变化;应力波在节理处发生了复杂的能量转移,随入射角度增大,反射同类型波和反射转换波之间能量此消彼长并在某一角度附近几乎同时达到极值,同类型波的部分能量转移到转换波,但其能量仍远高于转换波。
- 黏弹性节理 /
- 应力波传播 /
- 等效标准线性固体模型 /
- 透射系数 /
- 反射系数
Abstract: The study on the propagation characteristics of stress waves is crucial to estimate the dynamic stability of project construction. Based on the excavation blasting tests on the basalt rock mass with columnar joints and considering the creep and stress relaxation characteristics of rock, an equivalent standard linear solid model for rock mass joints is proposed. By using the displacement discontinuity method, the propagation equation for obliquely incident stress waves across viscoelastic joints is carried out. Then the propagation characteristics are studied. The reflection coefficient increases with the increase of the frequency of incident waves, but the transmission coefficient decreases rapidly. As the incident angle increases within the critical angle, the transmission coefficient of converted waves (T_sp or T_ps) has the smallest value and increases at first then decreases, while the reflection coefficient of converted waves (R_sp or R_ps), and R_ss(R_pp) decreases at first then increases, but T_ss(T_pp) basically has no change. Complex energy transfer happens when the stress waves cross the viscoelastic joints. The energy between R_ss(R_pp) and R_sp(R_ps) transfers to each other, then reaches their extreme points almost together when the incident angle is close to a certain value. The energy of the same kind of waves is been transferred to that of converted waves as the incident angle increases. But the same kind of waves have much more energy than the converted waves all the way.
- viscoelastic joint /
- stress wave propagation /
- equivalent standard linear solid model /
- transmission cosfficienti /
- reflection coefficient

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参考文献(18)

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