基于标准贯入试验的土壤液化判别公式锤击数基准值研究  

Reference blow counts of standard penetration tests used in soil liquefaction evaluation formulae

作　　者：贾端阳 陈龙伟[1,2] 谢旺青 李鑫洋 JIA Duan-yang;CHEN Long-wei;XIE Wang-qing;LI Xin-yang(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin,Heilongjiang 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080

出　　处：《岩土力学》2023年第10期3031-3038,共8页Rock and Soil Mechanics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(No.2020B01);黑龙江省自然科学基金(No.LH2022D020)。

摘　　要：我国抗震设计规范中基于标准贯入试验(standard penetration test,SPT)锤击数的砂土液化判别公式是我国科学家提出的适于我国国情、具有中国特色且工程应用最广泛、最权威的液化判别公式。该公式的基本原理是采用场地地下水位和饱和砂层埋深修正SPT锤击数基准值得到临界锤击数。该方法中SPT基准锤击数取决于液化数据,而构建规范判别公式所采用的数据库主要来自我国20世纪六七十年代发生的几次地震的震后勘察测试数据及震害经验,但数据一直未得到系统地更新。通过搜集、整理、吸收近期国内地震的液化数据,极大地扩充了我国液化数据库。借鉴我国规范液化判别方法的理论框架,通过数据分析给出不同烈度下SPT锤击数基准值,构建新的液化判别公式。利用新的判别公式对液化数据进行回判检验。结果显示,新公式能够较好地判别液化数据和非液化数据,保持较高、且液化数据和非液化数据均衡的回判成功率。该研究结果可为我国规范液化判别方法的改进提供支撑。The sand liquefaction evaluation formulae based on the standard penetration test(SPT)blow count in China’s seismic design code are the most widely used and authoritative liquefaction evaluation formula proposed by Chinese scientists,which are suitable for China’s national conditions.The basic principle of this formula is to use the groundwater level of the site and the burial depth of the saturated sand layer to correct the reference value of SPT blow count to obtain the critical blow count.The SPT reference blow counts in this formulae depend on liquefaction data.However,the database used to construct the evaluation formulae in the codes mainly comes from post earthquake survey and testing data as well as earthquake damage experience of several earthquakes that occurred in China in the 1960s and 1970s,but the data has not been systematically updated.By adding liquefaction data from recent earthquakes in China,the number of liquefaction data is significantly increased.Drawing on the theoretical framework of liquefaction discrimination methods in China’s codes,this paper gives the benchmark values of SPT blow counts under different intensities through data analysis,and constructs a new liquefaction discrimination formula.To verify the formulae,back-judgement on the data were performed,and the results indicate the success rates of the new formulae are fairly satisfactory and keep balance between liquefaction data and non-liquefaction data.The analytical results presented herein can be helpful for revising liquefaction evaluation methods in seismic design codes.

关 键 词：标准贯入试验 液化判别公式 锤击数基准值 液化数据 

分 类 号：TU435[建筑科学—岩土工程]