我国规范液化判别方法在新疆地区适用性检验

Feasibility of liquefaction prediction method in China's seismic code to Xinjiang region

2003年2月24日新疆巴楚—伽师地区发生了Ms6.8级地震,出现了大面积的液化,此次地震是自1976年唐山大地震30年来我国大陆境内砂土液化现象最为严重的一次。以2009年巴楚地区现场调查和原位测试为基础,检验了我国规范液化判别方法对巴楚地震场地液化判别的适用性,并将形成规范的数据与巴楚地区液化场地情况进行了初步对比分析。结果表明,我国现有规范液化判别方法对巴楚地震场地液化判别的总体成功率为66%,其中非液化场地判别成功率为84%,而液化场地的判别成功率仅为47%,并给出了明显偏于危险的结果,显然不适用于新疆巴楚地区。我国规范形成数据主要来源于唐山、通海和海城地震,巴楚地区可液化场地基本条件与之差异较大,需要建立该地区区域性液化判别方法。

Ms6.8 Bachu-Jiashi earthquake of Xinjiang causes a large scale of soil liquefaction, which has shown the most notable phenomenon of sand liquefaction in China since Tangshan Great Earthquake in 1976. In terms of the investigations and field tests in the Bachu-Jiashi liquefied areas in 2009, the feasibility of the liquefaction evaluation method in China's code for seismic design of buildings is discussed. The results reveal the successful judgment ratio by the code is 85% for non-liquefied sites and is only 43% for liquefied sites in Bachu area of Xinjiang. The code will lead obviously risky judgments and isn't suitable for Bachu area in deed. The data for the method in China's seismic code are mainly from Tangshan, Tonghai and Haicheng Earthquakes in China, furthermore the conditions of Bachu-Jiashi area are quite different from the data of the code, therefore, an appropriate local method for liquefaction prediction in Xinjiang region should be established.