摘要
该文以菲律宾某海岸火山碎屑物堆积地层为研究对象,开展标准贯入原位测试与室内试验,基于国标法与美标NCEER法分析砂土、粉土和黏性土的液化潜势。结果表明,对于粉土、砂土而言,当标贯击数较低时,采用国标法和NCEER法得到的液化潜势评估结果一致;对于黏性土而言,国标法认为地层不具液化潜势;但依据NCEER法分析后发现,当标贯击数较低时,黏粒含量低于20%,黏性土同样具液化潜势。分析认为,两种方法虽均基于原位测试指标得到动强度与发生地震时导致土体液化的动应力之比,但在细粒含量、原位测试数据以及地震作用方面的数据处理存在差异,导致液化判定结论有所差异。这为海外项目地基土液化综合判定提供了理论依据和数据参考。
This paper takes the pyrcolastic accumlation stratum of a coast of the Philippines as the research object,and carries out standard penetration in-site test and laboratory test.Based on the national standard method and American Standard NCEER method,the liquefaction potential of sandy soil,silt and cohesive soil is analyzed.The results show that for silt and sand,when the SPT blow count is low,the liquefaction potential evaluation results obtained by national standard method and NCEER method are consistent.For the cohesive soil,the national standard method considers that the stratum has no liquefaction potential;However,according to the NCEER method,it is found that when the SPT blow count is low,the clay content is less than 20%,and the cohesive soil also has liquefaction potential.The analysis shows that although the two methods all obtain the ratio of dynamic strength and the dynamic stress by soil liquefaction in earthquake based on the in-situ test indexes,but there are differences in fine particle content,in-situ test data and data processing in seismic action,these result the different in liquefaction judgment conclusions.This provides the theoretical basis and data reference for the comprehensive judgment of foundation soil liquefaction of overseas projects.
作者
朱会强
张明
薛茹
郭军辉
贾继龙
Zhu Huiqiang;Zhang Ming;Xue Ru;Guo Junhui;Jia Jilong(Zhongyun International Engineering Co.,Ltd.;Zhengzhou University of Aeronautics;Henan Electric Power Survey and Design Institute)
出处
《勘察科学技术》
2022年第1期1-6,共6页
Site Investigation Science and Technology
基金
河南省科技攻关项目(212102310968、222102320137)
建华建材(河南)有限公司科研课题(YJH-2020KY-01)
关键词
火山碎屑物堆积地层
液化判定
国标法
NCEER法
pyroclastic accumulation stratum
liquefaction discrimination
national standard method
NCEER method
