细粒土液化判别特征指标研究

发布时间：2018-04-04 07:20

本文选题：细粒土　切入点：液化判别　出处：《岩土工程学报》2015年03期

【摘要】：中国液化判别方法形成于20世纪80年代,30年来无实质改进。对于细粒土液化判别方法,1999年土耳其Kocaeli地震和台湾集集地震后,国外研究人员做了大量工作。在前人工作基础上,重点研究细粒土液化判别式和初判条件特征指标。通过回顾唐山、海城地震液化场地细粒土土性特征,结合土耳其Kocaeli地震和台湾集集地震液化数据,详细对比国内外细粒土液化判别方法优缺点。结果表明:1塑性指数不宜作为液化判别式指标;2综合细粒含量与黏粒含量判别液化比单独使用任一指标要更为合理;3中国规范液化判别式对细粒土过于保守,尤其只针对粉土考虑黏粒含量导致更为保守,建议去掉"砂土黏粒含量取3"的规定;4黏粒含量不宜作为初判条件指标;5对细粒土的塑性指数,7度、8度和9度分别不小于10,13和15,可判为不液化土。
[Abstract]:Chinese liquefaction method formed in 1980s, 30 years without substantial improvement. For distinguishing method of fine grained soil liquefaction, the 1999 Turkey Kocaeli earthquake and Chi Chi earthquake in Taiwan, the foreign researchers have done a lot of work. On the basis of previous work, focusing on fine grained soil liquefaction and preliminary decision characteristics. Through the review of Tangshan Haicheng earthquake, liquefaction of fine soil characteristics, combined with the Turkey Kocaeli earthquake and Taiwan earthquake liquefaction data set, with comparing the advantages and disadvantages of fine grained soil liquefaction method. The results showed that 1 plastic index should not be used as liquefaction discriminant index; 2 comprehensive fine content and distinguishing clay content than using either alone to liquefaction index is more reasonable; 3 Chinese standard liquefaction discriminant of fine-grained soil is too conservative, especially considering only for silt clay content leads to more conservative, suggestions to remove sand The content of soil clay content is 3 "," 4 "clay content is not suitable as a preliminary condition index; 5, the plastic index, 7 degree, 8 degree and 9 degree of fine grained soil are no less than 10,13 and 15, respectively, which can be judged as non liquefied soil.

【作者单位】：中国地震局工程力学研究所;中国地震局兰州地震研究所;
【基金】：中国地震局地震预测研究所基本科研业务专项(2013IESLZ03) 国家科技部地震行业专项(201308015)
【分类号】：TU435

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