基于钻井台阵记录的场地放大效应初步研究

Preliminary study on site amplification effect based on borehole array records

钻井台阵记录是场地地表及地下质点震动的真实刻画,是研究场地放大效应的最直接手段。我国钻井台阵记录比较匮乏,利用国外钻井台阵资料研究我国场地的放大效应,具有十分重要的意义。通过日本K ik-net钻井台站的200309260450强震记录的计算分析,结果表明:"工程基岩"相对于硬基岩的场地放大因子为1.30;相对于"工程基岩"场地,Ⅱ类场地的放大因子为1.265,Ⅲ类场地的放大因子为1.371。我国以往的地震动参数区划图工作,可能低估了Ⅱ类场地的放大效应。

Analysis of borehole array records is the most direct measure for site amplification effect,because borehole array records depict the real particle vibration of the surface and the underground of specific site.It is of great significance to use foreign borehole records to study our site amplification because of relatively poor borehole array records in China.By analyzing borehole array records of 200309260450-earthquake in Japan Kik-net network,the results show that,the site amplification factor of engineering bedrock to the hard bedrock is 1.30.To engineering bedrock,the site amplification factor of II-type site is 1.265,and the site amplification factor of III-type site is 1.371.As a result,previous work of national zoning map,may have underestimated the amplification effect of II-type site.