| 天水黄土地区覆盖层厚度的反演研究 |
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| 引用本文： | 曾立峰,吴志坚,陈拓,霍元坤.天水黄土地区覆盖层厚度的反演研究[J].岩土力学,2012,33(6):1912-1916. |
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| 作者姓名： | 曾立峰 吴志坚 陈拓 霍元坤 |
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| 作者单位： | 1. 中国地震局 兰州地震研究所，兰州 730000；2. 中国地震局 黄土地震工程重点实验室，兰州 730000；3. 甘肃省岩土防灾工程技术研究中心，兰州 730000；4. 中国科学院寒区旱区环境与工程研究所，兰州 730000；5. 上海新建设建筑设计有限公司，上海 200030 |
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| 基金项目： | 国家自然科学基金项目(No.40902094,No.40974070);中国地震局地震预测研究所基本科研业务费项目(No.2010A76) |
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| 摘 要： | 基于天水黄土地区现场测试的539个地脉动测点数据，分析得到了其H/V频谱特征和场地卓越频率。结合该区59个钻孔编录和波速测试结果，运用1/4波长和覆盖层厚度与卓越频率统计等两种方法反演了该区黄土覆盖层厚度。结果表明，1/4波长法在黄土覆盖层较厚、且地层较为单一的III、IV级阶地具有较好的适应性；覆盖层厚度与卓越频率统计法得出了较高精度的覆盖层厚度与卓越频率之间的幂函数关系，简化了剪切波速的影响，在整个研究区域具有较好的适应性。
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| 关 键 词： | 黄土地区 覆盖层 地脉动 卓越频率 |
| 收稿时间： | 2011-11-28 |
Inversing study of overburden thickness in loess area of Tianshui |
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| ZENG Li-feng
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WU Zhi-jian
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CHEN Tuo
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HUO Yuan-kun.Inversing study of overburden thickness in loess area of Tianshui[J].Rock and Soil Mechanics,2012,33(6):1912-1916. |
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| Authors: | ZENG Li-feng WU Zhi-jian CHEN Tuo HUO Yuan-kun |
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| Institution: | 1.Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;2.Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration,Lanzhou 730000,China;3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou 730000,China;4.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;5.Shanghai New Construction Architectural Design Co.,Ltd.,Shanghai 200030,China) |
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| Abstract: | Based on the microtremor observation data of 539 measuring points in Tianshui,horizontal-to-vertical spectral ratio and the predominant frequency are analyzed.According to the geological records of 59 boreholes and shear wave velocity distribution,two methods including the quarter-wave length and statistical relationship between overburden thickness and predominant frequency are applied to inverse the overburden thickness.The results show that the quarter-wave length has great flexibility to the third and the fourth terraces with a thicker overburden and single stratum;high accurate formula simplifying the influence of shear wave velocity is drawn with the method of the statistical relationship between the overburden thickness and the predominant frequency;and it is suitable for the whole studied area. |
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| Keywords: | loess area overburden microtremor predominant frequency |
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