| 西安地裂缝场地动力响应规律及影响因素分析 |
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| 引用本文： | 慕焕东,邓亚虹,李荣建,徐恭.西安地裂缝场地动力响应规律及影响因素分析[J].西北地震学报,2019,41(2):418-427. |
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| 作者姓名： | 慕焕东 邓亚虹 李荣建 徐恭 |
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| 作者单位： | 西安理工大学岩土工程研究所, 陕西 西安 710048,长安大学地质工程与测绘学院, 陕西 西安 710054,西安理工大学岩土工程研究所, 陕西 西安 710048,西安理工大学岩土工程研究所, 陕西 西安 710048 |
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| 基金项目： | 国家自然科学基金项目（41772275） |
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| 摘 要： | 在地裂缝密集分布的西安地区,建筑"傍缝而建"的现象非常普遍,地裂缝的存在严重制约了城市建设用地的有效利用和规划。为研究地裂缝对场地动力响应的影响,分析地震动作用下地裂缝场地动力响应规律及其影响范围,以西安地裂缝为研究对象,基于室内振动台试验及FLAC~(3D)数值模拟,分析地裂缝场地动力响应中的加速度幅值动力响应特征。在此基础上,进一步分析不同地震波类型、地裂缝破裂面倾角、地震动强度、地裂缝两侧土层错距对地裂缝场地动力响应的影响。研究表明:地裂缝对场地动力响应影响明显,表现为地裂缝一定范围内峰值加速度呈"带状"分布,即地裂缝处峰值加速度最大,随着距地裂缝越来越远,峰值加速度逐渐减小后趋于稳定,带状分布范围上盘约30 m,下盘约20 m;地裂缝场地动力响应表现出明显的"上盘效应",即上盘峰值加速度略大于下盘;地震动强度对地裂缝场地动力响应影响明显,地裂缝倾角、地裂缝两侧土层错距、地震波对地裂缝场地动力响应均无明显影响
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| 关 键 词： | 西安地裂缝 场地 动力响应 振动台试验 数值分析 |
| 收稿时间： | 2018/7/15 0:00:00 |
Dynamic Response and Influencing Factorsof Ground Fissure Sites in Xi'an |
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| MU Huandong,DENG Yahong,LI RongJian and XU Gong.Dynamic Response and Influencing Factorsof Ground Fissure Sites in Xi'an[J].Northwestern Seismological Journal,2019,41(2):418-427. |
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| Authors: | MU Huandong DENG Yahong LI RongJian and XU Gong |
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| Institution: | Institute of Geotechnical Engineering, Xi''an University of Technology, Xi''an 710048, Shaanxi, China,College of Geology Engineering and Geomatics, Chang''an University, Xi''an 710054, Shaanxi, China,Institute of Geotechnical Engineering, Xi''an University of Technology, Xi''an 710048, Shaanxi, China and Institute of Geotechnical Engineering, Xi''an University of Technology, Xi''an 710048, Shaanxi, China |
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| Abstract: | Ground fissures are densely distributed in the Xi''an area. Buildings that are "near the seam and built" are very common, which influences land use and planning in the urban zones. To research the dynamic effects of the ground fissures, this paper chose the Xi''an ground fissure site as the object of the research. After performing the shaking table test and FLAC3D numerical simulation, the dynamic response characteristics, such as acceleration amplitude of the ground fissure site, were analyzed. On this basis, the influence of different types of seismic waves, the fracture surface''s dip angle at the ground fissure, the intensity of ground motion, and the soil dislocation on both sides of the ground fissures were further analyzed. The results showed that the ground fissures had an obvious effect on the dynamic response of the site, and that the peak acceleration, in a certain range, was zonal in distribution, i.e., the peak acceleration at the ground fissure was the largest. With increasing distance from the ground fissure, the peak acceleration gradually declined, becoming stable; the range of the zonal distribution was about 30 m in the hanging wall, and about 20 m in the footwall. The dynamic response of the ground fissure site showed an obvious "hanging wall effect," i.e., the peak acceleration of the hanging wall was slightly larger than that of the footwall. The ground motion intensity had an obvious effect on the dynamic response of the ground fissure site, while the dip angle of the ground fissure, seismic waves, and the soil dislocation on both sides of the ground fissures had no obvious effect on the dynamic response of the ground fissure site. |
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| Keywords: | ground fissure in Xi''an site dynamic response shaking table test numerical analysis |
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