适用于新疆场地的剪切波速液化判别公式

A shear-wave velocity discrimination formula for liquefaction applicable to Xinjiang region

2003年新疆巴楚—伽师地区发生了MS6.8级地震,地震伴随有大规模砂土液化现象发生。通过现场调查获取了44个场地的剪切波速数据,其中包含19个液化场地勘察点和25个非液化场地勘察点。使用现有两种典型剪切波速判别液化方法对新疆数据进行预测,结果表明该地区土性特殊,判别公式均不适用。据此,依据新疆场地实测数据提出了适用于新疆地区的剪切波速液化线性判别公式。建立的液化判别公式总成功率达84%,对液化和非液化场地回判成功率均为84%,公式形式简单明了,可靠度良好,可为新疆地区液化判别及相关地区性标准制订提供参考。

In 2003, an MS6.8 earthquake occurred in Bachu-Jiashi region of Xinjiang, causing large-scale liquefied phenomenon. 44 in-situ Vs records are collected, including 19 liquefied survey points and 25 non-liquefied points. The shear-wave velocity of the in-situ records is verified using two typical liquefaction prediction methods, and all the success discrimination ratios are not satisfied. So a discrimination formula for soil liquefaction applicable to the Xinjiang region is proposed. This formula is based on the Chinese code for seismic design of buildings(GB50011—2010), which is a linear model. The formula is brief and convenient, while the evaluation success ratio of the liquefied sites is 84% and that of the non-liquefied sites is 84%, with the total discrimination success ratio being 84%. Based on the real data analysis, the proposed discrimination method is quite reliable, and it may provide technical support for liquefaction prediction in Xinjiang and the relevant regions.