粉质土底床液化塌陷量形成试验研究  

EXPERIMENTAL STUDY ON COLLAPSE DEPTH BY LIQUEFACTION OF THE SILTY SOIL BED

作　　者：王刚[1,2] 许国辉[1,2] 黄哲[1,2] 刘会欣[3] 孙振红[1,2] 房虹汝 吕楚岫 

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

出　　处：《海洋地质与第四纪地质》2014年第5期171-178,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41076021);国家海洋局海洋公益性行业科研专项项目(201005005-6)

摘　　要：黄河三角洲海床沉积物质为粉质土,在大的风暴浪作用下海底浅表粉质土能够发生液化,形成塌陷凹坑。以黄河三角洲粉质土铺设底床,进行液化粉质土形成塌陷的波浪水槽试验,在底床粉粒和砂粒不随水流脱离液化区的前提下,对形成塌陷量的贡献因素进行了分析。根据试验数据,估算了黏粒迁移析出与液化区底床密度增大对液化致塌陷凹坑的贡献度,得出黏粒迁移析出贡献一般大于55%。试验还发现在波浪作用下粉质土液化后黏粒发生迁移,原均质底床黏粒含量在垂向上出现2个分段特点的重新分布,分段点处于水土界面、底床液化最终界面和最大液化界面上,每段以上少下多分布。Silty soil dominates the Yellow River subaqueous delta. Collapse often occurs due to the liquefac- tion of shallow silty soil under storm wave action. Wave flume experiments have been carried out in order to reveal the contribution factors to the collapse quantity of the liquefied silty soil bed. The soil was taken from the Yellow River. The contributions of clay migration and density increase to the collapses have been estimated. Our data shows that the contribution of clay migration is generally over 55%. The clay content t of the originally homogeneous silty soil bed was redistributed and a double-segment structure formed after the liquefaction at the water-soil interface and the final and maximum liquefied interfaces respectively. The clay content increases with the increase in depth in each segment.

关 键 词：粉质土 波浪作用 液化 黏粒迁移 塌陷凹坑 

分 类 号：P642.2[天文地球—工程地质学]