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外装置系统改造前后嘉山台地电阻率数据质量对比探究

2021-07-28尹天杰张明明孙亮亮赵桂宝

科技资讯 2021年8期

尹天杰 张明明 孙亮亮 赵桂宝

DOI:10.16661/j.cnki.1672-3791.2103-5042-8585

摘  要:该文简要介绍了嘉山台地电阻率外装置系统改造工作。通过整理归纳改造前后的观测数据,采取对比日变化曲线特征、月精度值大小等方式方法,分析改造后的数据质量是否得到优化,以此来对改造效能进行评价。对比分析发现,嘉山台在外装置系统改造后,日变特征并无显著差异,但是通过计算,月观测精度相对于改造前数值变小。并发现改造后两测道均方差值在某些特定时段差异性较大,推断出该台地电阻率观测受南京地铁3号线干扰。通过以上探究,得知此次改造观测数据质量相对有所提升,但是受到相关不可控因素的制约,数据质量还有较大的提升空间。

关键词:地电阻率  装置系统  精度  对比分析

中图分类号:P315                             文献标识码:A文章编号:1672-3791(2021)03(b)-0066-03

Comparative Study on the Quality of Resistivity Data of Jiashan Station before and after the External Device

System Transformation

YIN Tianjie1   ZHANG Mingming2  SUN Liangliang1  ZHAO Guibao1

(1.Jiashan Seismic Station of Anhui Earthquake Agency, chuzhou, Anhui Province, 239400 China;

2. Mengcheng Seismic Station of Anhui Earthquake Agency, bozhou, Anhui Province, 233500  China)

Abstract: The paper introduces the reconstruction of the external device system of the ground resistivity of Jiashan station. After the transformation, the observation data are summarized and compared with the characteristics of daily variation curve and the size of monthly accuracy value. The data quality after the transformation is optimized is analyzed to evaluate the efficiency of the transformation. The comparison analysis shows that the characteristics of daily variation are not significantly different after the external device system is reformed. However, through calculation, the monthly observation accuracy is smaller than that before the transformation. It is found that the mean square deviation of the two channels is different in some specific periods after the transformation. It is concluded that the earth resistivity observation of our station is disturbed by Nanjing Metro Line 3. Through the above research, we know that the quality of the reconstructed observation data has been improved relatively, but restricted by the relevant uncontrollable factors, the data quality still has a larger space to improve.

Key Words: Earth resistivity; Device system; Accuracy; Comparative analysis

嘉山臺地电阻率自2000年开始数字化观测以来,外装置系统已有20年没有进行大规模改造,由于该台外场地环境复杂,受到电极老化和线杆线缆破损等因素影响,观测数据质量近几年下降明显。该台经过前期方案设计,报上级部门审批,于2020年10月开展外装置系统改造工作,在11月中旬改造完成,开始试运行,并于11月26日投入正式观测。

1  地电阻率观测简述

嘉山台地电阻率于1973年投入观测,第一代仪器为DDC—2A地电仪,1991年和2000年分别更换PZ40数字地电仪和ZD8B地电仪。2013年,数字化地电仪ZD8M投入观测并使用至今。地电外线路采用架空方式,外场地布设在村庄及农田里,测区内有厂房、水渠和养殖场分布,环境较为复杂。……

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