地震动作用下岩质边坡动力分析模型研究

发布时间：2018-08-16 16:36

【摘要】：对于边坡的地震动力响应分析,现有的研究主要集中在对地震作用下边坡体的速度或加速度进行试验监测或数值模拟,针对地震波在坡体内部的传播规律与坡体位移及能量分布规律的研究较少。在已有试验研究基础上,结合弹性波理论,提出地震动作用下岩质边坡的动力理论分析模型,对地震动作用下含结构面岩质边坡内部的动力响应(位移和能量)分布规律进行研究。通过对比分析动力分析模型的结果、大型振动台试验结果和有限元分析结果,进一步探讨了地震波射线经过结构面的传播规律以及在坡体内部的能量传播规律,并从理论上对试验现象进行了详细分析,对地震动作用下复杂地质边坡的破裂机理进行了初步探讨。主要包含以下几个方面的结论:(1)基于弹性波理论,通过对地震波射线在岩质边坡中传播规律的研究,提出了一种适合研究岩质边坡动力稳定性的动力分析模型,推导了地震动作用下坡体内部区域的位移动力响应和能量密度动力响应的显式计算公式。(2)采用本文提出的动力分析模型对三种不同结构的边坡模型(均匀岩质边坡、含结构面岩质边坡和含软弱夹层岩质边坡)的位移动力响应规律分别进行了计算,并和试验结果进行了对比分析。(3)利用动力分析模型对地震动作用下含软弱夹层边坡内部的能量密度分布规律做了进一步分析,探讨了含软弱夹层结构边坡稳定性的变化规律和破裂机制。(4)对试验中含水平软弱薄层的原型岩质坡体进行有限元分析,进一步验证了提出的理论模型。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45

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