1.南京工业大学岩土工程研究所, 江苏 南京 210009
2.江苏省土木工程防震技术研究中心,江苏 南京 210009
吴琪(1991—),男,讲师,硕导,博士。主要从事混合料动力特性研究。E-mail: qw09061801@163.com
陈国兴(1963—),男,教授,博士。主要从事土动力学与岩土地震工程研究。E⁃mail: gxc6307@163.com
收稿:2021-07-05,
修回:2021-08-24,
纸质出版:2021-08-15
移动端阅览
吴琪,李浩,陈国兴.基于基本物理指标的饱和砂类土液化评价方法的通用性[J].防灾减灾工程学报,2021,41(04):883-892.
WU Qi,LI Hao,CHEN Guoxing.Applicability of the Evaluation Method for Saturated Sandy Soil Liquefaction based on Basic Physical Index[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(04):883-892.
吴琪,李浩,陈国兴.基于基本物理指标的饱和砂类土液化评价方法的通用性[J].防灾减灾工程学报,2021,41(04):883-892. DOI: 10.13409/j.cnki.jdpme.202107005.
WU Qi,LI Hao,CHEN Guoxing.Applicability of the Evaluation Method for Saturated Sandy Soil Liquefaction based on Basic Physical Index[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(04):883-892. DOI: 10.13409/j.cnki.jdpme.202107005.
基于基本物理指标的饱和砂类土液化评价方法,包括等效骨架孔隙比的确定及液化强度参数预测公式,理论上已经被证实是有效的,但其通用性和敏感性尚需检验。通过独立试验数据,验证该液化评价方法的适用性和可靠性,分析试样尺寸、制样方法、液化判别标准、测试方法以及试验人员熟练程度等因素对预测准确性的影响,并探讨细粒影响系数
b
值确定方法对拟合参数及预测误差的影响。结果表明:基于基本物理指标的饱和砂类土液化评价方法适用于不同地域的砂类土的液化评价;试验条件差异略微增大评价方法的预测误差,但液化强度最大预测误差小于21%,且有50%的液化强度预测误差小于10%。
b
值的确定方法对液化强度预测的准确性影响较小,呈现出较低敏感性。
The established evaluation method for liquefaction resistance of saturated sandy soils based on basic physical index, including the determination of equivalent skeleton void ratio and prediction formula of liquefaction resistance parameters, has been proven to be effective in theory, but its applicability and sensitivity need to be verified. The influence of sample size, preparation method, liquefaction criterion, test category and proficiency of testers on forecast accuracy were analyzed, and the effect of the fine-grain influence coefficient b-value determination methods on the fitting parameters and prediction errors was also investigated. The results indicate that the evaluation method for saturated sandy soils liquefaction resistance based on basic physical indicators is applicable to sandy soils distributed in different regions. Test conditions deviation will slightly increase the prediction error of the evaluation method, but the maximum prediction error is still less than 21%, in which most of the prediction errors are less than 20%, and 50% of the liquefaction resistance test prediction errors are less than 10%. The b-value determination method has little effect on the accuracy of the prediction, showing low sensitivity. This evaluation method for liquefaction resistance can be popularized and applied in actual engineering.
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