【摘要】：對于邊坡的地震動力響應分析,現(xiàn)有的研究主要集中在對地震作用下邊坡體的速度或加速度進行試驗監(jiān)測或數(shù)值模擬,針對地震波在坡體內(nèi)部的傳播規(guī)律與坡體位移及能量分布規(guī)律的研究較少。在已有試驗研究基礎上,結(jié)合彈性波理論,提出地震動作用下巖質(zhì)邊坡的動力理論分析模型,對地震動作用下含結(jié)構(gòu)面巖質(zhì)邊坡內(nèi)部的動力響應(位移和能量)分布規(guī)律進行研究。通過對比分析動力分析模型的結(jié)果、大型振動臺試驗結(jié)果和有限元分析結(jié)果,進一步探討了地震波射線經(jīng)過結(jié)構(gòu)面的傳播規(guī)律以及在坡體內(nèi)部的能量傳播規(guī)律,并從理論上對試驗現(xiàn)象進行了詳細分析,對地震動作用下復雜地質(zhì)邊坡的破裂機理進行了初步探討。主要包含以下幾個方面的結(jié)論:(1)基于彈性波理論,通過對地震波射線在巖質(zhì)邊坡中傳播規(guī)律的研究,提出了一種適合研究巖質(zhì)邊坡動力穩(wěn)定性的動力分析模型,推導了地震動作用下坡體內(nèi)部區(qū)域的位移動力響應和能量密度動力響應的顯式計算公式。(2)采用本文提出的動力分析模型對三種不同結(jié)構(gòu)的邊坡模型(均勻巖質(zhì)邊坡、含結(jié)構(gòu)面巖質(zhì)邊坡和含軟弱夾層巖質(zhì)邊坡)的位移動力響應規(guī)律分別進行了計算,并和試驗結(jié)果進行了對比分析。(3)利用動力分析模型對地震動作用下含軟弱夾層邊坡內(nèi)部的能量密度分布規(guī)律做了進一步分析,探討了含軟弱夾層結(jié)構(gòu)邊坡穩(wěn)定性的變化規(guī)律和破裂機制。(4)對試驗中含水平軟弱薄層的原型巖質(zhì)坡體進行有限元分析,進一步驗證了提出的理論模型。
[Abstract]:For the seismic dynamic response analysis of slope, the existing research mainly focuses on the experimental monitoring or numerical simulation of the velocity or acceleration of the slope under earthquake. There are few studies on the propagation law of seismic wave in slope body and the law of displacement and energy distribution of slope body. On the basis of experimental research and elastic wave theory, a dynamic theoretical analysis model of rock slope under ground motion is proposed. The dynamic response (displacement and energy) distribution of rock slope with structure under ground motion is studied. By comparing and analyzing the results of dynamic analysis model, large shaking table test and finite element analysis, the propagation law of seismic waves passing through the structural plane and the law of energy propagation inside the slope are further discussed. The experimental phenomena are analyzed in theory, and the fracture mechanism of complex geological slope under ground motion is preliminarily discussed. The main conclusions are as follows: (1) based on the theory of elastic wave, a dynamic analysis model for studying the dynamic stability of rock slope is put forward by studying the propagation law of seismic wave ray in rock slope. The explicit formulas for the dynamic response of displacement and energy density in the slope under ground motion are derived. (2) the dynamic analysis model proposed in this paper is used to analyze the slope models of three different structures (homogeneous rock slope). The displacement dynamic response laws of rock slope with structure and rock slope with weak intercalation are calculated respectively. The results are compared with the experimental results. (3) the distribution of energy density in the slope with weak intercalation under ground motion is further analyzed by using the dynamic analysis model. The variation law and fracture mechanism of slope stability with weak intercalation structure are discussed. (4) finite element analysis of the prototype rock slope body with horizontal weak thin layer in the test is carried out, and the theoretical model is further verified.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU45

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