中国模式下砾性土液化指数评价新方法  

A new method for evaluating liquefaction potential index of gravelly soils under Chinese mode

作　　者：袁近远 崔家伟 李兆焱[2,3] 袁晓铭 张钰洋[2] Yuan Jinyuan;Cui Jiawei;Li Zhaoyan;Yuan Xiaoming;Zhang Yuyang(Heilongjiang University of Science and Technology,Harbin 150022,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]黑龙江科技大学,黑龙江哈尔滨150022 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080 [3]中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《土木工程学报》2024年第9期98-108,共11页China Civil Engineering Journal

基　　金：黑龙江省自然科学重点基金(ZD2019E009)。

摘　　要：砾性土地震液化是我国土木工程震害防治技术体系建设面临的新问题,砾性土液化指数作为砾性土液化判别的最终表征量及抗液化对策的实际控制指标,是当前体系发展中亟待突破的瓶颈。该文继承中国模式,基于2008年我国汶川地震实测数据,提出以超重型圆锥动力触探击数比余量为基本变量的砾性土液化指数评价新方法。采用我国独有资料,构建砾性土的理论计算液化指数与宏观调查液化指数间函数关系,分析我国规范中既有液化指数与液化等级对应关系的可行性,建立适于砾性土液化指数与液化等级的对等关系,以实测资料多方论证新方法的合理性。提出的新方法,保持了中国模式的优势,可为实际工程应用和我国规范修订提供直接的技术支持。Earthquake liquefaction of gravelly soils is a new problem encountered in the establishment of earthquake disaster prevention and control technology system of civil engineering in China.The liquefaction potential index of gravelly soils,as the final quantity of gravelly soils characterizing liquefaction discrimination and the actual control parameter of anti-liquefaction measure,is the bottleneck of the development and breakthrough of current system.With the Chinese mode inherited and based on the measured data of 2008 Wenchuan earthquake in China,a new method for evaluating the liquefaction potential index of gravelly soils is proposed with the blow count ratio residual of Chinese dynamic penetration test taken as the basic variable.The functional relationship between theoretically calculated liquefaction potential index and macroscopically investigated liquefaction potential index of gravelly soils was established based on the unique data of China,and the feasibility of the corresponding relationship between the existing liquefaction potential index and liquefaction grade in the current Chinese code was analyzed.The equivalence relationship between the liquefaction potential index and liquefaction grade of gravelly soils was provided,and the rationality of the new method was demonstrated by the measured data.The proposed method maintains the advantages of the Chinese mode and can provide direct technical support for practical applications and revision on Chinese code.

关 键 词：砾性土 液化指数评价 超重型圆锥动力触探击数比 理论液化指数 宏观液化指数 

分 类 号：TU435[建筑科学—岩土工程]