【作者】 王亮；

【导师】 年廷凯；

【作者基本信息】 大连理工大学 ， 建筑与土木工程（专业学位）， 2016， 硕士

【摘要】 岩质边坡地震稳定性评价是我国西南地区基础设施建设所面临的重要课题,而边坡动态响应过程是影响地震作用下边坡失稳破坏模式及工程边坡防护设计的关键因素。本文依托“5·12”汶川特大地震诱发的唐家山滑坡和东河口滑坡,基于两个滑坡发生前的原型边坡,概化出两类边坡的工程地质力学模型；以数值模拟方法为技术手段,分析了两类岩质边坡的地震峰值加速度响应规律,并深入探讨了坡角、边坡地质结构、地震动特性等对峰值加速度分布规律的影响,成果可为地震条件下边坡的整体与局部稳定性评价及振动台实验中的模型选型设计提供直接依据。论文主要工作包括以下几个方面：(1)通过对汶川地震诱发的唐家山滑坡和东河口滑坡野外地质考察,查阅国内外相关文献,概化出上缓下陡型和上陡下缓型两类原型边坡的工程地质力学模型。(2)采用大型数值计算软件FLAC3D,对上述两类边坡开展了地震作用下地震加速度动态响应的数值模拟与分析。利用FLAC3D内置的Fish语言编写相关程序,将地震峰值加速度计算结果导入Tecplot中,绘制出边坡内部加速度放大系数等值线图,并对比分析了坡体不同部位峰值加速度响应特征。(3)通过变动参数比较研究,深入分析了坡角、边坡地质结构、地震动特性等因素下边坡坡面不同部位的加速度响应特征,并据此认为上缓下陡型边坡的地震加速度响应特性强于上陡下缓型边坡。在双向地震动输入情况下,当输入幅值增加到一定值时,坡面不同部位的加速度响应特征将随之发生变化。(4)采用遍布节理模型模拟层间结构面,考虑顺层和反倾两类边坡地质结构、岩层倾角与坡角之间的关系,深入分析了层状边坡、二元边坡、二元层状边坡在正弦波作用下峰值加速度响应规律,得出边坡坡面、坡顶等关键点处加速度放大系数的量化值。(5)基于获得的定量化加速度放大系数关系,结合上缓下陡型边坡模型,分析了设计地震烈度下的水平峰值加速度放大系数和垂直峰值加速度放大系数,并将结果应用于边坡工程分析软件Slide中,获得了考虑地震峰值加速度放大效应的顺层岩质边坡稳定性系数,为地震区工程边坡的稳定性评价提供了新的途径。更多还原

【Abstract】 With the construction of infrastructure in southwestern China, the seismic stability evaluation of rock slope is becoming a significant issue. Dynamic response process of rock slope is a key factor to affect failure modes and engineering designs. Based on Tangjiashan landslide and Donghekou landslide, two generalization engineering geomechanical models are created; based on numerical simulation method, the peak acceleration distribution laws of two kinds of rock slope are analyzed. Furthermore, effects of some factors on peak acceleration distribution are discussed. These results can be applied for the stability evaluation of slope and lectotype design of model in shaking table test. This paper includes several aspects:(1)Based on the field investigation of Tangjiashan landslide and Donghekou landslide, two kinds of rock slope are generalized by consulting literature at home and abroad.(2)Using finite difference software FLAC3D, the dynamic response of two kinds of generalized slope is analyzed. Peak acceleration calculation results are acquired by using built-in fish language in FLAC3D. A program is created to import calculation results to Tecplot software. Thus, contour maps of amplification coefficient of acceleration are acquired. Also, the response features of different areas of slopes are compared.(3)By changing different parameter(slope angle, geological structure and ground motion characteristics), the peak acceleration responses of gentle upward slope and steep upward slope are analyzed. According to calculation results, peak acceleration response feature of gentle upward slope is higher than steep upward slope. With the increasing of amplitude, peak acceleration response feature of different positions in the surface of slope will changes.(4)Using ubiquitous-joint model to simulate structural plane and taking bedding structure and anti-dipped structure into consideration, peak acceleration response features of stratified slope, dualistic slope and dualistic stratified slope under sinusoidal waves are analyzed. Thus, values of acceleration amplification coefficient in some key points of slope are acquired.(5)Based on acceleration amplification coefficient acquired by numerical simulation, combined with a generalized model, the peak values of horizontal and vertical acceleration under different design intensity are analyzed. These results are applied to a slope analysis software Slide, the stability factors of bedding rock slope are acquired. It provides a new method to evaluate the stability of engineering slopes in seismic region.更多还原