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通过LOGISTIC模型,以世界范围内19次大地震106个场地的液化案例为基础,构建基于CPT的液化概率评价模型,采用仅通过CPT试验即可获取的锥尖阻力和摩阻比作为评价参数,既体现严格的统计学意义又具有明确的物理意义,预测液化和非液化的可靠性分别达到91.2%和86.8%。并拟合得到液化概率和抗液化安全系数的S型关系曲线以便于工程应用。理论分析与工程实例对比表明,相对于《岩土工程勘察规范》推荐的CPT模型,本文建议模型的评价结果和《建筑抗震设计规范》的SPT模型评价结果更为接近,且物理意义更为明确,为利用现场原位测试数据进行地基液化评价提供了更为简洁、准确的新途径,可以作为规范方法的有益补充。
Based on the LOGISTIC model, based on the liquefaction cases of 106 sites in 19 major earthquakes around the world, a liquefaction probability evaluation model based on CPT was constructed. The cone tip resistance and friction resistance ratio obtained by CPT test alone were used as evaluation parameters, It not only shows strict statistical significance but also has clear physical meaning. It is predicted that the reliability of liquefaction and non-liquefaction will reach 91.2% and 86.8% respectively. The S-curve of liquefaction probability and anti-liquefaction safety factor is fit for engineering application. The comparison between theoretical analysis and engineering example shows that compared with the CPT model recommended by Geotechnical Investigation Regulation, this paper suggests that the evaluation results of the model are closer to the SPT model evaluation results of “Seismic Design Code for Buildings” and the physical meaning is more clear , Which provides a more concise and accurate new way to evaluate the liquefaction of the foundation by on-site in-situ test data. It can be used as a supplement to the standard method.