| 高铁路基正交跨越地裂缝带动力响应数值分析 |
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| 引用本文： | 何国辉,黄强兵,王涛,刘妮娜.高铁路基正交跨越地裂缝带动力响应数值分析[J].工程地质学报(英文版),2020,28(1):149-157. |
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| 作者姓名： | 何国辉 黄强兵 王涛 刘妮娜 |
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| 作者单位： | ①.长安大学，地质工程系，西安 710054，中国 |
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| 基金项目： | 国家自然科学基金面上项目41772274国家自然科学基金面上项目41072222 |
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| 摘 要： | 本文以大西客运专线高速铁路正交跨越地裂缝带为研究对象,基于有限元数值方法建立了高速铁路地基-地裂缝-路堤动力计算模型,模拟分析了高速列车荷载作用下有、无地裂缝带天然地基上路基的动力响应差异特征及影响规律。计算结果表明:列车荷载作用下无地裂缝带场地,路基动位移、加速度和动应力响应基本平稳,没有明显差异现象;而地裂缝带场地路基动位移、路堤本体内加速度均表现为上盘增大、下盘减小,垂直于线路走向路基动位移、加速度幅值衰减下盘大于上盘,地裂缝对加速度影响的临界深度约为地表以下15 m;地裂缝的存在引起其上盘路基出现动应力降低和下盘动应力增强现象,地裂缝场地沿深度方向路基动应力影响的临界深度为地表以下10 m。上述研究结果可为我国地裂缝发育区高速铁路建设与防灾减灾提供科学依据。
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| 关 键 词： | 高速铁路 地裂缝 天然地基 路基 有限元数值模拟 列车荷载 动力响应 |
| 收稿时间： | 2019-06-03 |
NUMERICAL ANALYSIS OF DYNAMIC RESPONSE OF HIGH-SPEED RAILWAY SUBGRADE ORTHOGONALLY CROSSING GROUND FISSURE ZONE |
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| ZONE HE Guohui,HUANG Qiangbing,WANG Tao,LIU Nina.NUMERICAL ANALYSIS OF DYNAMIC RESPONSE OF HIGH-SPEED RAILWAY SUBGRADE ORTHOGONALLY CROSSING GROUND FISSURE ZONE[J].Journal of Engineering Geology,2020,28(1):149-157. |
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| Authors: | ZONE HE Guohui HUANG Qiangbing WANG Tao LIU Nina |
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| Institution: | ①.Department of Geological Engineering, Chang'an University, Xi'an 710054, China②.Institute of Geotechnical and Underground Engineering, Chang'an University, Xi'an 710054, China③.Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, China |
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| Abstract: | This paper takes the Datong-Xi'an passenger transport line subgrade orthogonally crossing ground fissure zone as research object. It establishes the foundation-ground fissure-embankment dynamic calculation model of high-speed railway with the finite element numerical method. It simulates and analyzes the dynamic response characteristics of subgrade on natural foundation with and without ground fissure zone under the action of high-speed train load. The results show that the response of dynamic displacement, acceleration and dynamic stratum stress of subgrade in natural site without ground fissure under train load is basically steady without obvious differences. In ground fissure site, the dynamic displacement of subgrade and the acceleration of embankment body both increases in the hanging wall and decreases in the footwall of active ground fissure zone, and the attenuation amplitude of dynamic displacement and acceleration of the subgrade in the footwall is greater than that of the hanging wall of ground fissure zone in perpendicular direction of train line. The critical influence depth of acceleration induced by ground fissure is about 15m below the ground. The dynamic stress in subgrade reduces in the hanging wall and increases in the footwall of ground fissure. The dynamic stress critical depth of subgrade in ground fissure site is 10m below the ground. The research results can provide scientific basis for the construction of high-speed railway and disaster prevention and mitigation in ground fissure development area in China. |
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| Keywords: | High-speed railway Ground fissure Natural foundation Subgrade Finite element numerical simulation Train loads Dynamic response |
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