基于剪切波速的砾性土液化概率计算的中国方法  

The Chinese method for calculating the liquefaction probability of gravelly soils based on shear wave velocity

作　　者：袁近远 苏安双 陈龙伟[3] 许成顺[4] 王淼 袁晓铭[3] 张思宇 YUAN Jin-yuan;SU An-shuang;CHEN Long-wei;XU Cheng-shun;WANG Miao;YUAN Xiao-ming;ZHANG Si-yu(Heilongjiang Hydraulic Research Institute,Harbin,Heilongjiang 100050,China;School of Civil Engineering,Heilongjiang University of Science and Technology,Harbin,Heilongjiang 150027,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin,Heilongjiang 150080,China;Faculty of Urban Construction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]黑龙江省水利科学研究院,黑龙江哈尔滨100050 [2]黑龙江科技大学建筑工程学院,黑龙江哈尔滨150027 [3]中国地震局工程力学研究所,黑龙江哈尔滨150080 [4]北京工业大学城市建设学部,北京100124

出　　处：《岩土力学》2024年第11期3378-3387,3415,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.52408525);北京工业大学城市与工程安全减灾教育部重点实验室基金项目(No.2024B03)。

摘　　要：砾性土地震液化风险评价是我国工程防震减灾面临的新问题,原位剪切波速试验是具有普适性的技术手段,但现有方法不适用于中国。建立中国模式下基于剪切波速的砾性土液化概率计算新方法,并与已有的基于地震循环剪应力比CSR(cyclic stress ratio)理论建立的CYY(Cao,Youd and Yuan,简称CYY)计算方法进行对比。采用实测数据和不同概率下液化临界线模型的对比分析表明,所提出的中国模式基于剪切波速的砾性土液化概率计算新方法,解决了CYY方法不适用我国的问题,且模型构造较CYY方法先进,克服了CYY方法难以兼顾不同砾性土层埋深和不同地震动强度的缺点。无论是退化为概率0.5的确定性判别结果,还是实测数据下液化概率计算的可靠性,本方法均优于CYY方法。提出的公式已被具有我国样板规范性质的《建筑工程抗震性态设计通则》修订版采纳,可为相关规范修订及工程应用提供指导与技术支持。Assessing the risk of earthquake-induced liquefaction in gravelly soils is a new challenge faced by earthquake prevention and disaster reduction efforts in China's engineering sector.In situ shear wave velocity testing is a universally applicable technical method;however,existing methods are not suitable for China.This study establishes a new method for calculating the liquefaction probability of gravelly soils based on shear wave velocity under the Chinese model,and compared it with the CYY(Cao,Youd and Yuan)method,which is based on the CSR(cyclic stress ratio)theory.The comparative analysis using measured data as well as different probability liquefaction threshold models indicates that the proposed Chinese model for calculating the liquefaction probability of gravelly soils based on shear wave velocity can solve the problem of CYY method unsuitable for China and is more advanced than the CYY method.It overcomes the shortcomings of the CYY method,which struggles to simultaneously consider different burial depths of gravelly soil layers and the effects of varying seismic intensities.Both in the deterministic discrimination with a probability of 0.5 and in the reliability of liquefaction probability calculation under measured data,the method proposed in this paper outperforms the CYY method.The proposed formula in this paper has been adopted in the revised version of the General Rules for Performance-Based Seismic Design of Buildings,serving as a model for China,and can provide guidance and technical support for related specifications and engineering applications.

关 键 词：砾性土 剪切波速 液化概率 中国方法 

分 类 号：TU472[建筑科学—结构工程]