【摘要】：給定邊坡(即各巖土參數(shù)已確定)的地震動力響應(yīng)大小主要受到地震動力作用方式的影響,而目前,邊坡地震響應(yīng)問題研究中現(xiàn)有的幾種主要研究方法關(guān)注的都是邊坡體質(zhì)點在地震作用下的動力響應(yīng)(邊坡體內(nèi)部的位移、速度、加速度和動應(yīng)力)以及坡體是否發(fā)生破壞,對于地震波在邊坡體內(nèi)的傳播及其對地震波能量在坡體內(nèi)的分布的影響尚未給予足夠關(guān)注。本文結(jié)合射線理論推導(dǎo)了點源疊加合成入射平面地震波的公式,應(yīng)用射線分析方法對邊坡超聲物理模型在SH型剪切平面波入射激振作用下的響應(yīng)波場進(jìn)行了分析,將射線方法分析結(jié)果與超聲物理模擬結(jié)果進(jìn)行對比,解釋了波射線在模物理模型內(nèi)匯聚與發(fā)散的規(guī)律與波動能量分布的關(guān)系,為理解邊坡地震動力響應(yīng)與地震波傳播的關(guān)系提供了依據(jù)。本文研究取得了以下認(rèn)識與成果(1)無論是物理實驗還是射線理論計算,利用點源疊加方法都可以正確的模擬出平面波入射激振,證明了利用射線方法研究邊坡在地震作用下的響應(yīng)的可行性。(2)射線方法可以清晰的反映出波在模型中的傳播過程,揭示波場能量分布的原因,并能在理論上對邊坡動力響應(yīng)給予合理的解釋。(3)射線方法能夠計算出邊坡體質(zhì)點在地震波作用下的運動過程(響應(yīng)時程),對研究邊坡地震動力響應(yīng)的動態(tài)過程具有重要意義。限于本次研究所應(yīng)用的射線分析軟件的局限性,射線分析得到的波場強弱分布與超聲物理模型實驗得到的相應(yīng)結(jié)果有一定差異,這是今后有待改進(jìn)之處。
[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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.9

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本文編號：2442539