基于CPTU土类指数的标贯值液化判别

发布时间：2018-04-09 09:55

本文选题：液化地基　切入点：孔压静力触探　出处：《东南大学学报(自然科学版)》2017年04期

【摘要】：为提高可液化地基液化判别的准确性,依托宿新高速公路共振法加固可液化地基项目,对共振法处理后的液化地基进行CPTU试验和SPT试验.对CPTU试验得到的土类指数I_c和SPT试验得到的标贯值N_(63.5)进行处理分析.结果表明,饱和砂土和粉土的标贯值N_(63.5)是土类指数I_c的一次函数(N_(63.5)=-18.8I_c+52.0),即土类指数越大,土性越接近黏性,标贯值越小.基于N_(63.5)与I_c的拟合关系式提出一种新型液化判别方法,即根据标贯值参照《建筑抗震设计规范》进行饱和砂土和粉土地基的液化判别,其中标贯值根据I_c计算获得,I_c则通过CPTU试验获取.与规范中SPT判别法相比,该方法可以提供连续的标贯值参数,与基于CPT的周期阻力比法相比,该方法计算简单.
[Abstract]:In order to improve the accuracy of liquefaction discrimination of liquefiable foundation, the liquefiable foundation was strengthened by resonance method of Suxin Expressway. The CPTU test and SPT test were carried out on the liquefied foundation treated by resonance method.The soil index I\\\The results show that the standard penetration value of saturated sand and silt is a primary function of the soil index I _ S _ c, that is, the larger the soil index is, the closer the soil property is to the viscosity and the smaller the standard penetration value is.A new method of liquefaction discrimination is proposed based on the fitting relation between NSP 63.5) and Istip c, that is, liquefaction of saturated sand and silt foundation is determined by reference to the Code for Seismic Design of buildings according to the standard value of liquefaction.According to the calculation of I\\\ {\ {\}\\\Compared with the SPT discriminant method in the specification, this method can provide continuous parameters of the standard value. Compared with the periodic resistance ratio method based on CPT, this method is simple to calculate.
【作者单位】：东南大学岩土工程研究所;江苏省城市地下工程与环境安全重点实验室;苏州市轨道交通集团有限公司;
【基金】：国家自然科学基金资助项目(41372308) 中央高校基本科研业务费专项资金资助项目江苏省普通高校研究生科研创新计划资助项目(SJLX15_0060) 江苏省自然科学基金资助项目(BK20150279)
【分类号】：TU435

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