| 动力作用下锚杆格构支护土质边坡动态响应分析 |
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| 引用本文： | 郝建斌,姚婕,黄毓挺,李金和. 动力作用下锚杆格构支护土质边坡动态响应分析[J]. 延边大学学报(自然科学版), 2015, 0(5): 93-100 |
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| 作者姓名： | 郝建斌 姚婕 黄毓挺 李金和 |
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| 作者单位： | 长安大学 地质工程与测绘学院，陕西 西安 710054 |
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| 摘 要： | 地震边坡稳定性是岩土工程和地震工程中研究的重点问题之一。针对锚杆格构支护的均质土坡在地震荷载作用下的动力响应，通过振动台模型试验，分析了不同坡高地震加速度和速度响应规律、边坡位移特征及支护结构破坏特征，揭示了均质土坡及其支护结构在地震作用下的变形破坏机理。结果表明:随着振动次数的增加，边坡模型自振频率逐渐降低；低频动荷载作用下坡体上部加速度响应最大，但随着振动频率的增加，放大作用降低，即边坡对低频振动波有放大作用，而对高频振动波却有滤波作用；振动频率较小时，坡体整体速度较大，但不同高度差异较小，破坏并不明显；振动频率接近模型边坡自振频率时，坡体上部速度最大，下部速度最小，且变化明显，破坏性最大；动荷载作用过程中，滑坡体的变形模式表现为旋转位移和水平位移，滑体和基体间相对位移上部较大；支护结构破坏时，上层锚杆和中层锚杆被拔出，上部格构发生严重隆起；虽然边坡做往复运动，但最终仍有一定相对位移；在设计支护结构时，要适当加长上部锚杆的长度，并且对中、上部格构进行补强。
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| 关 键 词： | 边坡稳定性 地震 正弦波 动态响应 振动台试验 锚杆 格构 |
Analysis of Dynamic Response of Soil Slope Reinforced by Anchors and Lattices Subjected to Dynamic Loads |
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| HAO Jian-bin,YAO Jie,HUANG Yu-ting,LI Jin-he. Analysis of Dynamic Response of Soil Slope Reinforced by Anchors and Lattices Subjected to Dynamic Loads[J]. Journal of Yanbian University (Natural Science), 2015, 0(5): 93-100 |
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| Authors: | HAO Jian-bin YAO Jie HUANG Yu-ting LI Jin-he |
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| Affiliation: | School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China |
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| Abstract: | Seismic slope stability is one of the key topics in geotechnical engineering and earthquake engineering. In order to study the dynamic response of homogeneous soil slope supported by anchors and lattices under seismic loading. Based on the shaking table test, the seismic acceleration, velocity and displacement of slope and the failure of supporting structures at different heights were analyzed, and the deformation and failure mechanisms of homogeneous soil slope and its supporting structures under seismic load were discussed. The results show that the nature frequency of slope model decreases with the increase of vibration time; the response of acceleration is maximum at the upper of slope subjected to dynamic load with low frequency, and the amplification effect decreases with the increase of vibrational frequency, that is, the slope has amplification effect on vibration waves at low frequency, and has filtering effect at high frequency; though the whole velocity of slope is large at low frequency, the velocities at different heights of slope are almost the same, so that there is no obvious failure happened to the slope and its supporting structures; when vibrational frequency is close to nature frequency of slope model, the velocity is maximum at the upper of slope and minimum at the bottom, and the failure is significant; the deformation types of landslide body subjected dynamic loads include rotation displacement and horizontal displacement, and the upper relative displacement between the active and the resistant parts of slope is large; when the supporting structures destroy, the top-row and mid-row anchors are pulled out, and the upper lattices bump seriously; though the slope shakes back and forth, there is relative displacement; the upper anchors are lengthened appropriately, and the middle and upper lattices are strengthened for the design of the supporting structures. |
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| Keywords: | slope stability earthquake sinusoidal wave dynamic response shaking table test anchor lattice |
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