地震作用下非贯通节理岩体斜坡破坏的动力响应机理研究
文献类型：学位论文
| 作者 | 倪振强 |
| 学位类别 | 博士 |
| 答辩日期 | 2012-05-31 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 孔纪名 |
| 关键词 | 地震 非贯通节理 岩质斜坡 动力响应 破坏机理 |
| 其他题名 | Dynamic Response Mechanism of Rock slopes Failure |
| 学位专业 | 岩土工程 |
| 中文摘要 | 汶川地震引发了数以千万计的地震次生山地灾害，特别是地震斜坡失稳破坏造成的灾害令人触目惊心。岩质斜坡的稳定变形分析由于其地质结构复杂多变以及其稳定性的不易判别，而成为工程和学术界关注的重大课题。由于岩体结构的复杂性，要十分准确地反映岩体结构的特征并使之模型化是非常困难的，实际上也没有必要使问题复杂化。基于这种考虑，对于一个实际滑坡工程来说，往往根据现场地质资料，即根据结构面的长度、密度、贯通率、展布方向等着重考虑2~3组起主要控制作用的节理组或其他主要结构面。因此本文以宏观的非贯通构造节理斜坡为研究对象，利用野外调查、数值模拟和室内物理模型试验相结合的手段，对地震作用下非贯通节理岩体斜坡这类特殊斜坡的动力响应机理进行了深入研究。通过对节理岩体的力学特性及破坏机制的分析，根据节理的形态特征及几何类型分类，阐述了非贯通节理的本构模型，并在此基础上对节理岩体的破坏机制进行了研究。利用大型有限元计算软件ANSYS，对静力作用下非贯通节理岩体斜坡破坏的机理进行了数值模拟，通过对斜坡的分类与对比，得到了不同结构面长度、密度、贯通率、展布方向等的斜坡的贯通模式与破坏机理。对于同样的模型，对其输入地震波，模拟了地震作用下非贯通节理岩体斜坡破坏的动力响应及机理，并与静力作用下的斜坡进行了比较。利用室内物理模型试验手段，展现了非贯通节理岩体斜坡的变形破坏过程，揭示了其在地震荷载作用下的动力响应破坏规律。最后为验证本文的研究思路的可行性与合理性，选择了汶川和云南干线公路的两个典型非贯通节理岩体斜坡，采用动力时程分析法，分别输入汶川地震波和EI地震波，分析了斜坡在地震作用下的动力响应特征。 |
| 英文摘要 | Millions of earthquake-induced mountain hazards have been caused by Wenchuan earthquake, especially seismic unstable failure slopes caused by disasters were startling. The stabilization and deformation analysis of rock slopes had become a major subject in engineering and academic circles that concerned about. Due to the complexity of rock structure, it was difficult to reflect the characteristics of the rock mass structure accurately, and it was difficult to be modeled, in fact, there was no need to complicate matters. In the view of this consideration, for an actual project, on the basis of the field geological data, that included length of the structural surfaces, density, rate of connectivity, spreading directions, etc. We often emphatically considered the 2 to 3 groups that played a major role of joints or other structural surfaces. So the paper studied macro intermittent joints slopes as the research object, using field investigation, numerical simulation and indoor physical model test as a combination of means, we had a depth study to the dynamic response mechanism of the special rock slopes failure containing intermittent joints under earthquake. Through the analysis of jointed rock mass mechanical properties and failure mechanism, according to the morphological characteristics of the joints and the geometry types, we described the constitutive models of intermittent joints, and then we studied the failure mechanism of the jointed rock mass. Using large finite element analysis software ANSYS, to do numerical simulation on the rock slopes failure containing intermittent joints under static force. Through the classification and comparison of the slopes, we got the coalescence mode and failure mechanism of slopes with different length of the structural surfaces, density, rate of connectivity, spreading directions, etc. For the same models, we input seismic waves to them, then simulated the dynamic response and failure mechanism of the rock slopes containing intermittent joints under earthquake, and compared with slopes under static force. Using the indoor physical model test means, that showed the deformation and failure process of rock slopes containing intermittent joints, and revealed their dynamic response failure laws under seismic loads. At last, in order to validate the feasibility and rationality of research ideas, we selected two typical rock slopes containing intermittent joints in Wenchuan and Yunnan trunk highway, adopted incremental dynamics analysis, input Wenchuan seismic wave and EI seismic wave respectively, to analyze the dynamic response characteristics of slopes under seismic action. |
| 语种 | 中文 |
| 公开日期 | 2013-01-14 |
| 源URL | [http://192.168.143.20:8080/handle/131551/4805]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 推荐引用方式 GB/T 7714 | 倪振强. 地震作用下非贯通节理岩体斜坡破坏的动力响应机理研究[D]. 北京. 中国科学院研究生院. 2012. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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