汶川地震远场黄土场地地震动场地放大效应机制研究

›› 2012, Vol. 33 ›› Issue (12): 3736-3740.

汶川地震远场黄土场地地震动场地放大效应机制研究

吴志坚^{1, 2, 3}，王兰民^{1, 2, 3}，陈拓⁴，王平^{1, 2, 3}

1.甘肃省地震局中国地震局黄土地震工程重点实验室，兰州 730000；2.中国地震局兰州地震研究所，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冻土工程国家重点实验室，兰州 730000

收稿日期:2012-06-15 出版日期:2012-12-12 发布日期:2012-12-15
作者简介:吴志坚，男，1974年生，博士，研究员，主要从事岩土地震工程和冻土工程领域的研究工作。
基金资助:
国家自然科学基金项目（No.40902094，No. 50978239）；中国地震局地震预测研究所基本科研业务费项目（No. 2012IESLZ01）；国家重点基础研究发展计划资助(973项目)（No. 2012CB026106）

Study of mechanism of site amplification effects on ground motion in far field loess during Wenchuan Ms8.0 earthquake

WU Zhi-jian^{1, 2, 3}, WANG Lan-min^{1, 2, 3}, CHEN Tuo⁴, WANG Ping^{1, 2, 3}

1. Key Laboratory of Loess Earthquake Engineering of CEA, Gansu Earthquake Administration, Lanzhou 730000, China; 2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China; 3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China; 4. Key State laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy Sciences, Lanzhou 730000, China

Received:2012-06-15 Online:2012-12-12 Published:2012-12-15

摘要/Abstract

摘要： 通过汶川地震震后科学考察发现，汶川地震局部场地的震害和地震动放大效应明显，地震对甘肃省境内远离震中的黄土地区造成了较为严重的破坏。在此基础上，结合钻孔波速测试，运用二维等价线性时程响应动分析法对甘肃省平凉市典型黄土塬进行了地震动力响应计算，分析了该地区局部场地条件对地震动放大效应的影响。研究发现，黄土塬具有地震动放大效应，随着塬高的增加，加速度、速度、位移均出现放大效应；随着地震动在黄土覆盖层中的传递，卓越频率向低频移动，高频成分被吸收，加速度反应谱中长周期分量逐渐增大。数值计算结果与实际震害基本吻合，其结果对黄土地区进行合理的抗震设防具有一定的科学意义。

关键词: 黄土场地, 放大效应, 动力响应, 波速

Abstract: Based on earthquake damage investigation after the Wenchuan Ms8.0 earthquake, it is discovered that the phenomena of site amplification effects on ground motion were very obvious both in the mountainous area of southeastern Gansu province and the Loess Plateau areas. Combining with the borehole exploration, site seismic response analysis of the typical loess tableland at Pingliang City, Gansu province is carried out applying the dynamic finite element method of two dimensions linearly equivalent for dynamic response numerical calculation; the local amplification effect of the loess tableland is studied as well. The results show that there are seismic amplification effects at loess tableland; and acceleration, velocity and displacement increases with increase in tableland height gradually. Moreover, the low frequency components become more abundant and the high-frequency components are absorbed with increase in tableland height. The long-period components of acceleration response spectrum have increased gradually as well. The numerical results are basically consistent with the earthquake damages, so as to have certain scientific significance for the reasonable seismic fortification in loess regions.

Key words: loess site, amplification effect, dynamic response, wave velocity

中图分类号:

TU 435

吴志坚，王兰民，陈拓，王平 . 汶川地震远场黄土场地地震动场地放大效应机制研究[J]. , 2012, 33(12): 3736-3740.

WU Zhi-jian , WANG Lan-min , CHEN Tuo , WANG Ping . Study of mechanism of site amplification effects on ground motion in far field loess during Wenchuan Ms8.0 earthquake[J]. , 2012, 33(12): 3736-3740.

参考文献

相关文章 15

[1]	吴琪, 丁选明, 陈志雄, 陈育民, 彭宇, . 不同地震动强度下珊瑚礁砂地基中桩-土-结构地震响应试验研究[J]. 岩土力学, 2020, 41(2): 571-580.
[2]	夏坤, 董林, 蒲小武, 李璐, . 黄土塬地震动响应特征分析[J]. 岩土力学, 2020, 41(1): 295-304.
[3]	周凤玺, 柳鸿博, 蔡袁强, . 饱和多孔热弹性介质中Rayleigh波传播特性分析[J]. 岩土力学, 2020, 41(1): 315-324.
[4]	于一帆, 王平, 王会娟, 许书雅, 郭海涛, . 堆积层滑坡地震动力响应的物理模型试验[J]. 岩土力学, 2019, 40(S1): 172-180.
[5]	杨道学, 赵奎, 曾鹏, 卓毓龙, . 基于粒子群优化算法的未知波速声发射定位数值模[J]. 岩土力学, 2019, 40(S1): 494-502.
[6]	张国凯, 李海波, 王明洋, 李晓锋, . 基于声学测试和摄像技术的单裂隙岩石裂纹扩展特征研究[J]. 岩土力学, 2019, 40(S1): 63-72.
[7]	陈宇龙, 内村太郎, . 基于弹性波波速的降雨型滑坡预警系统[J]. 岩土力学, 2019, 40(9): 3373-3386.
[8]	杨文波, 邹涛, 涂玖林, 谷笑旭, 刘雨辰, 晏启祥, 何川. 高速列车振动荷载作用下马蹄形断面隧道动力响应特性分析[J]. 岩土力学, 2019, 40(9): 3635-3644.
[9]	周凤玺, 柳鸿博, . 非饱和土中Rayleigh波的传播特性分析[J]. 岩土力学, 2019, 40(8): 3218-3226.
[10]	陈卓识, 袁晓铭, 孙锐, 王克. 土层剪切波速不确定性对场地刚性判断的影响[J]. 岩土力学, 2019, 40(7): 2748-2754.
[11]	杨洋, 孙锐, 陈卓识, 袁晓铭. 基于土层常规参数的剪切波速液化概率计算公式[J]. 岩土力学, 2019, 40(7): 2755-2764.
[12]	赵振华, 张晓君, 李晓程, . 含卸压孔硬岩应力松弛特性试验研究[J]. 岩土力学, 2019, 40(6): 2192-2199.
[13]	谌民, 张涛, 单华刚, 王新志, 孟庆山, 余克服, . 钙质砂压缩波速与物理性质参数关系研究[J]. 岩土力学, 2019, 40(6): 2275-2283.
[14]	姜立春, 罗恩民, 沈彬彬, . 多自由度模型法的立体采空区群爆破动力响应研究[J]. 岩土力学, 2019, 40(6): 2407-2415.
[15]	邹佑学, 王睿, 张建民, . 可液化场地碎石桩复合地基地震动力响应分析[J]. 岩土力学, 2019, 40(6): 2443-2455.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed