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2008年5月12日中国发生的8.0级汶川大地震中,位于Ⅶ、Ⅷ度交接处的德阳松柏村液化破坏十分明显,喷砂类型丰富,液化伴随大量地裂缝,液化加震现象十分显著,具有典型研究价值。对该村进行了详细的现场测试并与以往液化震害进行了对比分析,结果表明:尽管松柏村地表主要喷出物是中砂和粗砂,但实际液化土与喷出物差别显著,主要为砂砾土液化;以往还没有提出过适于工程应用的砂砾土液化判别方法,而超重型动力触探(DPT)具有设备简单、经济实用、测试数据连续的优点,可作为砂砾土液化预测的核心指标;松柏村大量地裂缝现象不是由次断层造成而是由土层液化引起,而液化产生地裂缝的基本条件为地表较平坦(<3%)以及液化土层水平分布不均匀;液化减震的基本条件为上覆非液化层足够厚且较为密实,但定量评价方法还有待进一步研究。
In the 8.0 magnitude Wenchuan earthquake that occurred in China on May 12, 2008, the liquefaction of the Songbai village in Deyang at the junction of Ⅶ and Ⅷ degrees was very obvious. The types of sandblasting were abundant. Liquefaction was accompanied by a large number of ground fissures, Has a typical research value. A detailed on-site test of the village was carried out and compared with the previous liquefaction damage. The results show that although the major pollutants on the surface of Songbai village are medium sand and coarse sand, the differences between the actual liquefied soil and the discharge are significant. Liquefaction of gravel soil. In the past, no judgment method of liquefaction of gravel soil suitable for engineering applications has been proposed. However, DPT has the advantages of simple, economical and practical test data, which can be used as prediction of liquefaction of gravel soil The main reason for the ground fissure generated by liquefaction is that the surface is flat (<3%) and the horizontal distribution of liquefied soil is uneven; and the liquefaction loss The basic condition for the earthquake is that the overlying non-liquefied layer is thick and dense enough, but the quantitative evaluation method remains to be further studied.