砂土液化概念的再认识  

Recognition of the Concept of Sand Liquefaction

作　　者：许国辉[1,2] 陈志远 任宇鹏 刘志钦 Xu Guohui;Chen Zhiyuan;Ren Yupeng;Liu Zhiqin(The Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China;College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学山东省海洋环境地质工程重点实验室,山东青岛266100 [3]中国海洋大学海洋地球科学学院,山东青岛266100 [4]自然资源部第一海洋研究所,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2023年第12期138-145,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41976049)资助。

摘　　要：饱和砂土液化是地震或波浪等循环动荷载作用下常见的工程地质灾害。但是,饱和砂土液化概念目前尚存在不能明确反映其发生的本质特征、对机理表述不清晰等问题。本文通过砂土液化过程分析,给出饱和砂土液化的本质原因是:在动力作用下,某些砂粒周围有冗余空间时,其向冗余空间运动的离散力大于其周围约束力,而向冗余空间产生分离运动,并由此原因引发其周围砂粒产生同样的分离运动的链式反应过程,最终使砂土呈现出离散的流动现象。通过对已有振动台实验和波浪水槽实验数据的分析,解释了对此本质原因认识的合理性。Liquefaction of saturated sand is a common engineering geological disaster under cyclic loads such as earthquake or wave.However,at present,the concept of liquefaction of saturated sand does not clearly reflect the essential characteristics of its occurrence and the mechanism is not clearly stated.Through the analysis of sand liquefaction process,this paper gives the essential reason for saturated sand liquefaction:under the dynamic action,when there is a redundant space around some sand particles,the discrete force of its movement towards the redundant space is greater than its surrounding binding force,and the separation movement towards the redundant space occurs,which causes the chain reaction process of the same separation movement of the sand particles around it,and finally makes the sand appear discrete flow phenomenon.The rationality of understanding this essential cause is explained by analyzing the existing data of shaking table test and wave flume test.Through the analysis of the existing shaking table experiment and wave flume experiment data,the rationality of the understanding of this essential reason is explained.

关 键 词：砂土液化 动力 流化 动力流化 链式反应 

分 类 号：P642[天文地球—工程地质学]