Plasticity Based Liquefaction Criteria
Plasticity Based Liquefaction Criteria
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基于塑性的液化标准
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
C. Polito
中科院分区：
文献类型：
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作者：
C. Polito
自20世纪70年代引入中国建筑规范以来，基于塑性的液化标准为评价含粘土细粉砂的液化敏感性提供了一种手段。这些标准用于区分不可液化的土壤和易液化的土壤。大多数建议的标准包含一些关于粘土含量和土壤塑性的最低要求。塑性细粒含量和塑性对桑迪液化敏感性的影响的参数研究结果被用来评估几个更常用的基于塑性的液化标准的准确性。大多数建议的标准被发现有保守的要求，土壤塑性。满足塑性准则的土壤被发现有很大不同的变形特性循环荷载下比那些土壤不符合标准。然而，所有审查的标准也被发现包括其他要求，这是不准确的预测液化敏感性。根据这些研究结果，建议提供了一个简化的塑性液化标准。
Since their introduction into Chinese building codes in the 1970’s, plasticity-based liquefaction criteria have provided a means for evaluating the liquefaction susceptibility of sands with clayey fines. These criteria are used to separate soils that may be considered non-liquefiable from those susceptible to liquefaction. The majority of the proposed criteria contain some minimum requirement regarding clay content and soil plasticity. The results of a parametric study into the effects of plastic fines content and plasticity on the liquefaction susceptibility of sandy soils were used to evaluate the accuracy of several of the more commonly used plasticity-based liquefaction criteria. Most of the proposed criteria were found to have conservative requirements in terms of soil plasticity. Soils meeting the plasticity criteria were found to have very different deformation characteristics under cyclic loading than those soils not meeting the criteria. However, all the criteria reviewed were also found to include other requirements which were not accurate predictors of liquefaction susceptibility. In light of these findings, recommendations are provided for a simplified plasticity-based liquefaction criteria.