| 断续节理岩体中地震波响应的数值与理论分析 |
| |
| 引用本文： | 任梦,蒋道东,黄威,李雪松.断续节理岩体中地震波响应的数值与理论分析[J].地震学报,2020,42(1):44-52. |
| |
| 作者姓名： | 任梦 蒋道东 黄威 李雪松 |
| |
| 作者单位： | 1.中国武汉 430000 中交第二航务工程局有限公司 |
| |
| 摘 要： | 为研究地震产生的应力波在断续节理岩体中的传播规律和应力分布趋势，首先，采用数值模拟方法分析应力波通过贯通节理的传播规律，并与已有理论研究结果进行对比，验证数值分析的准确性和适用性；然后，对应力波在断续节理岩体中的传播进行数值模拟，分析透射系数在水平方向的分布趋势以及不同节理连续性对波传播的影响，并结合波的衍射原理，给出定性的理论解释。结果表明:应力波通过断续节理时，节理的透射作用会使应力波振幅减小，引起波的衰减，岩桥的衍射作用则会使波阵面由平面变为曲面，波的传播方向发生改变，从而导致应力波振幅在水平方向的分布发生变化；应力波通过断续节理的透射系数与岩桥尺寸Lr和衍射角μ相关，当衍射角比较小时，透射系数主要受岩桥尺寸Lr的影响，当衍射角较大时，岩桥尺寸Lr和衍射角μ共同影响应力波在岩体中的传播。
|
| 关 键 词： | 地震应力波 断续节理 数值模拟 波衍射 |
| 收稿时间： | 2019-05-16 |
Numerical and theoretical analyses of seismic wave response in non-persistent jointed rock mass |
| |
| Institution: | 1.CCCC Second Harbor Engineering Company Ltd.，Wuhan 430000，China2.CCCC Highway Bridge National Engineering Research Centre Co. Ltd，Wuhan 430000，China3.State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300350，China4.Key Laboratory of Large-Span Bridge Construction Technology，Wuhan 430000，China5.Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure，Wuhan 430000，China |
| |
| Abstract: | In order to reveal the regulation of seismic stress wave propagation and the distribution of wave amplitude in jointed rock masses, the wave propagation across persistent joints is simulated firstly, and the results are verified to be consistent with analytical results. Then, the horizontal distribution of transmission coefficient and the effect of joint persistency on wave propagation are researched by simulating seismic stress wave propagation across rock masses with a single non-persistent joint. Moreover, the theoretical analysis is proposed to explain the simulation results. The result shows that the joint segments induce wave attenuation, and rock bridges cause the change of the wave propagation direction. On the other hand, the transmission coefficient of stress wave through non-persistent joints is related to the size of rock bridge （Lr） and the diffraction angle （μ）. When the diffraction angle is small, the transmission coefficient is mainly affected by the size of rock bridge; otherwise, the size of rock bridge and the diffraction angle both affect the propagation of stress wave across non-persistent joints. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地震学报》浏览原始摘要信息 |
| 点击此处可从《地震学报》下载免费的PDF全文 |
|
