射线方法在边坡地震动力响应分析中的应用研究
发布时间：2019-03-17 17:46
【摘要】：给定边坡(即各岩土参数已确定)的地震动力响应大小主要受到地震动力作用方式的影响,而目前,边坡地震响应问题研究中现有的几种主要研究方法关注的都是边坡体质点在地震作用下的动力响应(边坡体内部的位移、速度、加速度和动应力)以及坡体是否发生破坏,对于地震波在边坡体内的传播及其对地震波能量在坡体内的分布的影响尚未给予足够关注。本文结合射线理论推导了点源叠加合成入射平面地震波的公式,应用射线分析方法对边坡超声物理模型在SH型剪切平面波入射激振作用下的响应波场进行了分析,将射线方法分析结果与超声物理模拟结果进行对比,解释了波射线在模物理模型内汇聚与发散的规律与波动能量分布的关系,为理解边坡地震动力响应与地震波传播的关系提供了依据。本文研究取得了以下认识与成果(1)无论是物理实验还是射线理论计算,利用点源叠加方法都可以正确的模拟出平面波入射激振,证明了利用射线方法研究边坡在地震作用下的响应的可行性。(2)射线方法可以清晰的反映出波在模型中的传播过程,揭示波场能量分布的原因,并能在理论上对边坡动力响应给予合理的解释。(3)射线方法能够计算出边坡体质点在地震波作用下的运动过程(响应时程),对研究边坡地震动力响应的动态过程具有重要意义。限于本次研究所应用的射线分析软件的局限性,射线分析得到的波场强弱分布与超声物理模型实验得到的相应结果有一定差异,这是今后有待改进之处。
[Abstract]:The seismic dynamic response of the given slope (that is, each geotechnical parameter has been determined) is mainly affected by the mode of seismic dynamic action, but at present, The main research methods in the study of slope seismic response are concerned about the dynamic response (displacement, velocity, acceleration and dynamic stress) of slope body points under the action of earthquake, and whether the slope body is destroyed or not. Enough attention has not been paid to the propagation of seismic waves in the slope body and its influence on the distribution of seismic wave energy in the slope body. In this paper, the formula of incident plane seismic wave superimposed by point source is derived based on ray theory, and the response wave field of slope ultrasonic physical model under SH shear plane wave incident excitation is analyzed by using ray analysis method. The analysis results of ray method and the results of ultrasonic physical simulation are compared to explain the relationship between the law of convergence and divergence of wave rays in the physical model and the distribution of wave energy. It provides a basis for understanding the relationship between the dynamic response of slope and the propagation of seismic waves. The following knowledge and achievements have been obtained in this paper: (1) using the point-source superposition method, the incident vibration of plane wave can be correctly simulated whether it is a physical experiment or a ray theoretical calculation. The feasibility of using ray method to study the response of slope under earthquake action is proved. (2) the ray method can clearly reflect the propagation process of wave in the model and reveal the cause of wave field energy distribution. The dynamic response of the slope can be explained reasonably in theory. (3) the ray method can calculate the motion process (response time) of the slope body point under the action of seismic wave. It is of great significance to study the dynamic process of slope seismic response. Limited to the limitations of the ray analysis software used in this study, the intensity distribution of the wave field obtained by the ray analysis is different from the corresponding results obtained by the ultrasonic physical model experiment, which is something to be improved in the future.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9
本文编号：2442539
[Abstract]:The seismic dynamic response of the given slope (that is, each geotechnical parameter has been determined) is mainly affected by the mode of seismic dynamic action, but at present, The main research methods in the study of slope seismic response are concerned about the dynamic response (displacement, velocity, acceleration and dynamic stress) of slope body points under the action of earthquake, and whether the slope body is destroyed or not. Enough attention has not been paid to the propagation of seismic waves in the slope body and its influence on the distribution of seismic wave energy in the slope body. In this paper, the formula of incident plane seismic wave superimposed by point source is derived based on ray theory, and the response wave field of slope ultrasonic physical model under SH shear plane wave incident excitation is analyzed by using ray analysis method. The analysis results of ray method and the results of ultrasonic physical simulation are compared to explain the relationship between the law of convergence and divergence of wave rays in the physical model and the distribution of wave energy. It provides a basis for understanding the relationship between the dynamic response of slope and the propagation of seismic waves. The following knowledge and achievements have been obtained in this paper: (1) using the point-source superposition method, the incident vibration of plane wave can be correctly simulated whether it is a physical experiment or a ray theoretical calculation. The feasibility of using ray method to study the response of slope under earthquake action is proved. (2) the ray method can clearly reflect the propagation process of wave in the model and reveal the cause of wave field energy distribution. The dynamic response of the slope can be explained reasonably in theory. (3) the ray method can calculate the motion process (response time) of the slope body point under the action of seismic wave. It is of great significance to study the dynamic process of slope seismic response. Limited to the limitations of the ray analysis software used in this study, the intensity distribution of the wave field obtained by the ray analysis is different from the corresponding results obtained by the ultrasonic physical model experiment, which is something to be improved in the future.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9
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