昆明地区剪切波速测试误差及其对反应谱影响初步研究

发布时间：2018-01-09 21:03

本文关键词：昆明地区剪切波速测试误差及其对反应谱影响初步研究　出处：《地震工程与工程振动》2016年05期 　论文类型：期刊论文

【摘要】：昆明是我国西部地区的重要城市。由于地震频发、地质条件复杂,昆明已经被我国列为重点抗震设防城市。昆明已经于2006年完成了整个城市的地震安评工作。为了进一步完善地震安评工作,本文对地震安评的必备参数——剪切波速进行了测试误差专项研究。为了保证实验精度,研究人员邀请了昆明地区7家测试单位对实验钻孔进行测试并要求这些单位提供了原始的波列图。依据现场的单孔法剪切波速实验结果,本文运用统计学基本原理给出了昆明地区的测试误差,用SHAKE2000软件计算研究了108个工况下的不同程度测试误差对地表加速度反应谱和PGA的影响,得到了如下结论:实测结果表明,0至40 m内昆明地区剪切波速测试误差不随深度发生明显改变,误差的标准差平均为8%,最大误差不超过20%;反应谱和PGA的变化程度随波速测试误差程度增加而增加;波速误差在1倍标准差内时,反应谱峰值部分变化小于20%;在波速取极值时,峰值部分变化可能超过40%;输入的地震动不同,反应谱和PGA的变化规律有明显的差异。输入波频率成分与场地频率成分接近的的地震动时,当波速测试误差变大时,反应谱和PGA的变化更明显。由于工作条件限制,本文只选取了一个昆明地区的实验场地,还需要丰富现场实验资料以构建更全面的波速测试误差分布规律,同时还需要计算研究更多工况下剪切波速测试误差对相关参数的影响。
[Abstract]:Kunming is an important city in the western part of China. Due to frequent earthquakes, the geological conditions are complicated. Kunming has been listed as the key earthquake fortification city in China. In 2006, Kunming has completed the earthquake safety assessment of the whole city. In order to further improve the seismic safety assessment work. In this paper, the test error of shear wave velocity, a necessary parameter of seismic safety assessment, is studied in order to ensure the accuracy of the experiment. The researchers invited seven test units in Kunming to test the experimental boreholes and asked them to provide the original wave train diagram. In this paper, the measurement error in Kunming area is given based on the basic principle of statistics. The effects of different degree of measurement errors on the ground acceleration response spectrum and PGA under 108 working conditions are studied by SHAKE2000 software. The results are as follows: the measured results show that. The measurement error of shear wave velocity in Kunming area from 0 to 40 m does not change obviously with depth. The standard deviation of error is 8, and the maximum error is not more than 20. The variation of the response spectrum and PGA increases with the increase of the measurement error of the wave velocity. When the error of wave velocity is within 1 times standard deviation, the peak value of response spectrum is less than 20. When the wave velocity reaches the extreme value, the variation of the peak value may exceed 40. The variation of response spectrum and PGA is obviously different from the input ground motion. When the frequency component of the input wave is close to that of the site frequency, the error of wave velocity measurement becomes larger. The change of response spectrum and PGA is more obvious. Because of the working condition restriction, only one experimental site in Kunming area is selected in this paper, and it is necessary to enrich the field experimental data in order to construct a more comprehensive law of wave velocity measurement error distribution. At the same time, it is necessary to calculate and study the influence of shear wave velocity measurement error on the related parameters under more working conditions.
【作者单位】：四川省核工业地质局二八二大队;中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室;
【基金】：中国地震局工程力学研究所基本科研业务费专项资助项目(2016C01) 国家科技部地震行业专项(201308015)~~
【分类号】：TU435
【正文快照】： 引言昆明是云南省省会,位于中国西南云贵高原中部,是西南地区的重要城市之一。昆明市属于高原内山间盆地地貌。总体地势北高南低,西高东低,中间隆起。从新板块构造角度来讲,昆明处于川滇板块隆起区的凹陷三级构造区内,周边有多条地震带分布。小江南北向强震带和易门南北向中强

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