黄河三角洲粉质土硬壳层特征及成因研究

›› 2007, Vol. 28 ›› Issue (10): 2029-2035.

黄河三角洲粉质土硬壳层特征及成因研究

贾永刚，董好刚，单红仙，刘小丽，刘红军

中国海洋大学海洋环境与生态教育部重点实验室，青岛 266003

收稿日期:2005-10-13 出版日期:2007-10-10 发布日期:2013-10-15
作者简介:贾永刚，男，1965年生，教授，主要从事岩土环境工程和海洋环境工程研究。
基金资助:
国家自然科学基金资助项目（No. 40472137；No. 40172088）

Study of characters and formation mechanism of hard crust on tidal flat of Yellow River estuary

JIA Yong-gang, DONG Hao-gang, Shan hong-xian, LIU Xiao-li, LIU Hong-jun

Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266003, China

Received:2005-10-13 Online:2007-10-10 Published:2013-10-15

摘要/Abstract

摘要： 在黄河三角洲选择硬壳层发育的典型研究区，用人工振动模拟波浪荷载，通过孔隙水压力的监测和强度的原位测试研究了1 m范围内粉土硬壳层的重复液化和强度变化规律。结果表明，硬壳层动态响应沿深度存在较大差异，经过重复液化后强度总体是升高的，上层土体强度提高相对显著。采集荷载施加前后的原状样品进行SEM图像定量分析，得到了微结构的变化规律，如不均匀系数变小，粒度分维值升高，孔隙比显著减小，定向性增强等，但各项指标的变化程度不同，沿深度存在着显著的差异，主要变化集中在上部土层。讨论了硬壳层的动态响应特征与微结构调整的对应耦合关系，初步了解了循环荷载作用下粉土硬壳层的特征及成因的微结构控制规律。

关键词: 粉质土, 硬壳层, 循环荷载, 动态响应, 微结构

Abstract: The typical area was chosen on the tidal flat of the Yellow River estuary where hard crust develop, simulating wave load test with a light compactor was carried out to study the repeat liquefaction and change law of crust layer within one meter through the monitoring of pore water pressure and in-situ soil strength measure. The results revealed that the dynamic response varies a lot along depth and the strength of silt increases after repeat liquefaction; the upper crust layer increases more obviously than the down. The undisturbed samples were taken before and after vibrating; and quantitative analyzing of SEM structure images is carried out on the samples of different depths. The results revealed that some indexes of microstructure change evidently; such as asymmetry coefficient descended, granularity direction strengthed, granulometric fractal dimensions improved and figure coefficient improved and ratio of pore will descended etc. The transformation varied a lot along depth with the range mainly concentrated above the upper site. The relation between the dynamic response character and their microstructure changes has been discussed; and the character and formation mechanism of hard crust under the control law of microstructure are grasped primarily on this base.

Key words: silt, hard crust, cyclic load, dynamic response, microstructure

中图分类号:

TU 435

贾永刚，董好刚，单红仙，刘小丽，刘红军. 黄河三角洲粉质土硬壳层特征及成因研究[J]. , 2007, 28(10): 2029-2035.

JIA Yong-gang, DONG Hao-gang, Shan hong-xian, LIU Xiao-li, LIU Hong-jun. Study of characters and formation mechanism of hard crust on tidal flat of Yellow River estuary[J]. , 2007, 28(10): 2029-2035.

参考文献

相关文章 15

[1]	刘斌, 许宏发, 董璐, 马语卿, 李可良, . 岩盐循环荷载下基于DS黏壶的非线性流变模型研究[J]. 岩土力学, 2018, 39(S2): 107-114.
[2]	时刚，刘忠玉，李永辉. 循环荷载作用下考虑非达西渗流的软黏土一维流变固结分析[J]. , 2018, 39(S1): 521-528.
[3]	程星磊，王建华，王哲学，. 软黏土中吸力锚循环失稳过程的模型试验[J]. , 2018, 39(9): 3285-3293.
[4]	张炜，李亚，周松望，蒋正波，吴非，梁文洲，. 南海北部区域黏土循环动力特性试验研究[J]. , 2018, 39(7): 2413-2423.
[5]	陈宾，周乐意，赵延林，王智超，晁代杰，贾古宁，. 干湿循环条件下红砂岩软弱夹层微结构与剪切强度的关联性[J]. , 2018, 39(5): 1633-1642.
[6]	王闵闵，鹿群，郭少龙，高萌，沈仲涛，. 循环荷载作用下纤维水泥土动力特性[J]. , 2018, 39(5): 1753-1760.
[7]	王新志，谌民，魏厚振，孟庆山，余克服，. 车辆荷载作用下钙质砂路基的动态响应试验研究[J]. , 2018, 39(11): 4093-4101.
[8]	陈毅，张虎元，杨龙, . 遗址土劣化进程中微观结构变化的类比研究[J]. , 2018, 39(11): 4117-4124.
[9]	卢义玉，韩帅彬，汤积仁，周雷，李泓涟，廖引, . 循环荷载下支撑剂的变形及渗透特性试验研究[J]. , 2017, 38(S1): 173-180.
[10]	崔凯，李永奎. 川西崩坡积混合土循环荷载下非饱和动本构模型[J]. , 2017, 38(8): 2157-2166.
[11]	李涛，唐小微. 两种黏粒含量淤泥质粉质黏土动残余应变试验[J]. , 2017, 38(6): 1609-1619.
[12]	杨爱武，孔令伟，郭飞,. 天津滨海软黏土动力累积塑性变形特性与增长模型[J]. , 2017, 38(4): 979-984.
[13]	臧濛，孔令伟，曹勇. 描述循环荷载作用下黏土累积变形的改进模型[J]. , 2017, 38(2): 435-442.
[14]	邓华锋，胡玉，李建林，王哲，张小景，张恒宾. 循环荷载的频率和幅值对砂岩动力特性的影响[J]. , 2017, 38(12): 3402-3409.
[15]	浦少云，饶军应，杨凯强，黄质宏，李永辉，陈泽南，李勤，刘汉卿，. 循环荷载下土体变形特性研究[J]. , 2017, 38(11): 3261-3270.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed