波致粉土底床液化泥沙出流形式试验研究  

Experimental Study on the Motion Forms of Outflowed Sediments from Wave-Induced Liquefied Seabed

作　　者：许国辉[1,2] 王刚[1,3] 吕楚岫 孙振红[1,2] 

机构地区：[1]海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学环境科学与工程学院,山东青岛266100 [3]河北省地矿局秦皇岛矿产水文工程地质大队,河北秦皇岛066000

出　　处：《中国海洋大学学报（自然科学版）》2016年第10期98-105,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目"粉质土海底波致粉砂流及其运动特性研究"(41076021);国家海洋局海洋公益性行业科研专项"近海海底地质灾害预测评价及防控关键技术研究"(201005005-6)资助~~

摘　　要：入海河口三角洲浅海环境中的低坡度粉土海底,受到长期波浪荷载或短期风暴浪作用,能够出现浅表层软弱区局部液化,液化后的泥沙继续受波浪作用,发展成更大规模的海底地质灾害,对海洋开发活动及设施构成严重危害。本文采用黄河三角洲粉土铺设试验底床,进行粉土底床液化后泥沙出流形式的波浪水槽试验,发现波浪作用下粉土底床液化后,液化泥沙将从源区出流。根据波浪水槽试验泥沙液化出流的过程与形式,将底床分为液化流动源区、坡面区、边壁区以及原始底床区四部分,前三个区域的循环转化推动液化泥沙以分层堆积推进的形式出流。本试验研究给出了浅海环境中一种可能的粉土底床液化出流形式。The low slope silt seabed of estuary delta can be local liquefied under the action of long-time wave load or short-time storm wave in shallow water environments.Liquefied sediment develop into a larger seabed geological disasters under the wave action,constituting a serious damage to the marine development activities and facilities.In this paper,the test bed with the Yellow River delta silty was carried out in wave flume experiment.According to the wave flume experiment of liquefied soil＇s flow mode,the process and mode of liquefied bed sediment had been obtained flowing from the source area under wave.At the same time,based on the movement characteristics of sediment in the process of flow,the test bed was divided into four parts（liquefied source area,slope area,side wall and original bed）.Loop transformation of the first three areas promoted liquefaction sediment to flow,causing the seabed slope instability,in the form of a stratified accumulation.The regional conditions and morphological characteristics of liquefaction were good correspondence with silt flow,which provided a probable flow mode of liquefied silty bed in shallow water environments.

关 键 词：波浪作用 粉土 液化 出流 

分 类 号：P642[天文地球—工程地质学]