地震波入射方向对边坡地震响应影响的超声模拟研究

项目名称： 地震波入射方向对边坡地震响应影响的超声模拟研究

项目编号： No.41472277

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 孙进忠

作者单位： 中国地质大学（北京）

项目金额： 98万元

中文摘要： 地震作用下的边坡稳定性是一个涉及多学科交叉的难题，是当前岩土工程和地震工程学研究的热点之一。边坡地震动力响应研究是边坡动力稳定性分析的基础，已经受到了普遍关注。当前对边坡地震动力响应研究的方法主要有现场地震动监测、振动台模拟实验和计算机数值模拟。由于振动台激振频率的限制，高边坡地震动力响应的振动台模拟很难满足物理相似性要求。另外，当前对斜入射地震波激励作用下边坡地震动力响应的研究十分有限。针对边坡地震动力响应研究中的这两个问题，本项目提出了地震波入射方向对边坡地震响应影响的超声模拟研究的目标：利用超声地震模型试验方法的高频优势突破振动台模拟的频率障碍；采用超声地震模拟和计算机数值模拟相结合的方法，确认超声波地震模拟方法对边坡地震动力响应的研究价值；揭示典型均质边坡对不同方向入射的地震波激励的动力响应特征，从而为边坡地震破坏方式的概率分析奠定基础。

中文关键词： 边坡地震响应；地震波入射方向；激振频率；超声模拟；相似性

英文摘要： Slope stability owing to earthquake actions is a hard problem involving a series of different scientific fields, and is also a hot research point in engineering gelology and engineering seismology. As a foundation for the analysis of slope dynamic stabilities, slope response to earthquakes has been widely concerned. At presedent, approaches to the study of slope responses to earthquakes mainly include in-situ mornitoring of seismic ground motion, physical moddeling by vibration table and numerical simulation by cumputer. Because of the limitation on the stimulating frequency of vibration stables, the physical similarities of the moddeling of high slope responses to earthquakes can hardly be satisfied. In addition, attentions put on slope responses to seismic waves with different incident directions are very little. In consideration of these two problems in the study of slope response to earthquakes, a proposal of research on slope responses to seismic waves with different incident directions is put forward: overcome the frequency obstacle of vibration stables to the moddeling of high slope responses to earthquakes by the high frequency advantage of ultrasonic moddeling; confirm the methodological value of ultrasonic moddeling approch to the study of slope responses to earthquakes by means of ulatrasonic moddeling expriments and numerical simulations by computer; reveal the characteristics of dynamic responses of typical shaped slopes with uniform media to seismic waves with different incident directions, so as to lay a foundation to probability analysis of slope damages by earthquakes. The main researchs in this project include: (1) the variation in dynamic responses of slopes to the stimulation of weak to strong seismic waves; (2) ultrasonic modeling method for slope response to seismic waves with different incident directions; (3) wave field characteristics in a typical shaped slope with a uniform medium stimulated by seismic waves with arbitrary incident directions. The key scientific problems to be resolved are as follows: (1) significance and value of ultrasonic modeling for slope respones to earthquakes; (2) key techniques for simulating the incidence of a plane wave by ultrasonic point source; (3) time and space relationship between the vibration mode and the wave field of slope resoponse to earthquake. The study of this project will be divided into two parts: approach exploration and stimulaiton of slope response to earthquake. The first part, approach exploration, will work on a simple slope to test stimulating method with ultrasonic point source and to confirm the value of the ultrasonic modeling approach; and the second one will carry out contrastive research between ultrasonic modeling and numerical simulation so as to reveal the charachteristics of slope dynamic response to seismic waves with different incident waves.

英文关键词： slope response to earthquake;incident direction of seismic wave;vibration frequency of stimulation;ultrasonic modeling;similarity