上海长江农场台PS波速测试在选取井下地震仪器安置位置的应用  

Application of seismic instrument placement location selection based on comprehensive deep well in Shanghai Changjiang Farm Station of PS wave velocity test

作　　者：裴晓[1] 刘佳敏[1] 林航毅[1] 

机构地区：[1]上海市地震局,上海20062

出　　处：《地球物理学进展》2015年第3期1167-1172,共6页Progress in Geophysics

基　　金：地震科技星火计划项目(XH14021Y)资助

摘　　要：上海市综合深井长江农场台建于2011年,站点深井中安装地磁仪、应变仪、倾斜仪、测震仪、空隙压仪、地温仪、水温仪、水位仪等多种观测仪器.通过地层的PS波波速测试可以了解该地的地层结构及工程场地地震效应.本次是在第四纪松散土层钻孔完毕,未下套管之前,进行了单孔法PS波波速测试,取得了珍贵的资料和良好的效果.通过计算,取得各土层的P波、S波波速和动泊松比数值.从波速测试的结果可以认为290m到360m为最适合的深度,同时参考了环境噪声影响的角度,从而可以认为290 m以下至最深度均适合投放地震仪器,最终该台选定了460m的深度放置地震监测仪器.基于对PS波速测试结果的分析,可以科学合理选定投放地震仪器的位置,从而能够高质量得保证综合深井项目顺利进行,对以后的再建综合深井台积累了宝贵的经验.Comprehensive deep Shanghai Changjiang Farm Station was built in 2011, installed magnetometer, strain gauge, inclinometer, seismometers, pore pressure, temperature, water temperature instrument, water meter installation site in deep well,. Through the formation of PS wave velocity test can know the structure of the area＇ s formation and the project site seismic effect. This is finished in the quaternary loose soil drilling, casing, before the puckering method of PS wave velocity test, valuable information and good results have been achieved. In Shanghai comprehensive deep project, the American production of S--Land digital seismic instrument and VCANTS5 control controller device, the Changjiang Farm Station successfully to the well depth of 400 meters of deep PS wave test, has obtained the precious soil data. Based on the analysis of the Changjiang Farm Station in Shanghai test results, we can scientific and reasonable to determine the instrument placement, ensure the equipment running well. Changjiang Farm Station PS wave test results and analysis results as follows： in the installation of down hole seismometer is 400 meters, S wave formation is larger than 600 m/s, showed that the soil properties are good. At a depth of 290 meters, dynamic Poisson＇s ratio decreased, numerical near 0. 42, show that this formation has become more dense in the gravity under the action of seismic instruments, pre layer can be placed at the same time. In view of the influence by the environment noise of the instrument, the soil structure was better, selected the deepest place seismic instrument, can obtain high quality monitoring data. Select the appropriate instrument placement, monitoring data can obtain high quality, for every million comprehensive deep bench is essential, to ensure the efficient operation of station equipment. The test data of PS wave of the Changjiang farm this acquisition provides valuable experience for the future to build more comprehensive deep well.

关 键 词：综合深井 PS波 波速测试 

分 类 号：P315[天文地球—地震学]