已入深夜,您辛苦了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!祝你早点完成任务,早点休息,好梦!

Mechanical and microscopic properties of soil according to the rate of increase in pore water pressure

孔隙水压力 大孔隙 剪切(物理) 壤土 材料科学 岩土工程 有效应力 黄土 淤泥 膨胀的 三轴剪切试验 扫描电子显微镜 土壤水分 地质学 复合材料 剪切(地质) 介孔材料 化学 土壤科学 地貌学 催化作用 生物化学
作者
Zhao Duan,Zhenyan Li,Yan-Bin Wu,Bing Niu,Rong-Jian Shen
出处
期刊:Soil & Tillage Research [Elsevier BV]
卷期号:225: 105530-105530 被引量:26
标识
DOI:10.1016/j.still.2022.105530
摘要

Increases in pore water pressure affect the effective stress state of loess soil, resulting in deformation and even soil erosion. However, it is still unclear how the mechanical behaviours and microstructures of soil are influenced by the rate of increase in pore water pressure (RIPWP). To better understand the mechanical failure process and properties of soil under different RIPWPs, a series of constant-shear drained (CSD) triaxial tests were carried out on Q 2 loess (silt loam, a loose aeolian deposit) in the South Jingyang Platform of China. Further, scanning electron microscopy (SEM) tests were conducted on the samples before and after the triaxial tests to observe the microscopic characteristics of the soil, and reveal the microscopic mechanism of liquefaction failure in soil under CSD triaxial tests. The results showed that the failure process was divided into two stages of 1) stable creep and 2) sharply unstable deformation. In the second stage, rapid-slow strain development was observed at relatively low RIPWPs. With increases in RIPWP, the critical pore pressure ratio u / σ c increased within the range of 0.48–0.66. Microscopic analysis of the samples after shearing found clay particles filling the pores and obvious aggregation structures. In addition, macropores and mesopores were transformed into micropores. With increases in RIPWP, the orientations of particles and pores increased and the abundance and fractal dimension of pores decreased. In conclusion, the microscopic mechanism of soil instability under CSD triaxial testing was as follows. Increases in pore water pressure led to the dispersion of fine particles, weakening of cementation, and the rotation and recombination of coarse particles within the soil. In addition, the clay particles rolled, slipped and filled into pore throats, resulting in the blockage of seepage channels and, correspondingly, rapid increases in local pore water pressure. Finally, the loess liquefied due to a sudden collapse of its structure under the effect of long-term high pore water pressure. These results can provide a theoretical guidance for soil management and slope instability prevention. • The rate of increase in pore water pressure (RIPWP) was as a variable. • Constant-shear drained (CSD) triaxial test samples were sheared by increasing the back pressure. • The critical pore pressure ratio was lower than those of traditional triaxial tests. • The formation of rapid-slow strain states was explained. • The microscopic mechanism of loess slope instability was revealed by combining mechanical tests and SEM tests.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
白啦啦完成签到 ,获得积分10
刚刚
小小黑发布了新的文献求助10
刚刚
9464完成签到 ,获得积分10
1秒前
jcl完成签到,获得积分10
1秒前
Rondab应助科研通管家采纳,获得10
1秒前
天人合一完成签到,获得积分10
1秒前
君知完成签到,获得积分10
1秒前
Rondab应助科研通管家采纳,获得10
1秒前
Aaron_Chia完成签到 ,获得积分10
1秒前
adkdad完成签到,获得积分10
1秒前
1秒前
桐桐应助科研通管家采纳,获得10
2秒前
顾矜应助科研通管家采纳,获得10
2秒前
Rondab应助科研通管家采纳,获得10
2秒前
2秒前
2秒前
2秒前
温柔的天奇完成签到 ,获得积分10
2秒前
机灵的笑南完成签到,获得积分20
2秒前
kikiii完成签到,获得积分10
2秒前
认真的代柔完成签到,获得积分10
2秒前
云淡风轻一宝完成签到,获得积分10
3秒前
wren完成签到,获得积分10
3秒前
勤奋帅帅完成签到,获得积分10
3秒前
jokerhoney完成签到,获得积分10
3秒前
老师心腹大患完成签到,获得积分10
3秒前
啊哒吸哇完成签到,获得积分10
3秒前
木马上市完成签到,获得积分10
3秒前
晓风完成签到,获得积分10
3秒前
kk完成签到,获得积分10
3秒前
RRRZZ完成签到 ,获得积分10
4秒前
大小罐子完成签到,获得积分10
4秒前
4秒前
qianzhihe完成签到,获得积分10
4秒前
网安小趴菜完成签到,获得积分10
4秒前
FODCOC完成签到,获得积分10
5秒前
姚芭蕉完成签到 ,获得积分0
5秒前
yingying完成签到 ,获得积分10
5秒前
七慕凉应助周大炮采纳,获得20
6秒前
思源应助芯之痕采纳,获得10
6秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3976540
求助须知:如何正确求助?哪些是违规求助? 3520626
关于积分的说明 11204173
捐赠科研通 3257226
什么是DOI,文献DOI怎么找? 1798653
邀请新用户注册赠送积分活动 877835
科研通“疑难数据库(出版商)”最低求助积分说明 806570