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
科研通AI2S应助科研通管家采纳,获得10
1秒前
SciGPT应助科研通管家采纳,获得10
1秒前
在水一方应助科研通管家采纳,获得10
1秒前
无心的鬼神完成签到,获得积分10
3秒前
lyx完成签到,获得积分10
3秒前
眠眠清完成签到 ,获得积分10
4秒前
5秒前
Amor完成签到,获得积分10
6秒前
Lion完成签到,获得积分10
6秒前
8秒前
自由的中蓝完成签到 ,获得积分10
9秒前
cavendipeng完成签到,获得积分10
10秒前
tinydog完成签到,获得积分10
12秒前
不知道完成签到,获得积分10
14秒前
jenningseastera完成签到 ,获得积分0
14秒前
阳佟天川完成签到,获得积分10
15秒前
yar应助Amor采纳,获得10
15秒前
郭自同完成签到,获得积分10
16秒前
熠熠完成签到,获得积分10
17秒前
李健应助稳重的秋天采纳,获得10
17秒前
SPUwangshunfeng完成签到,获得积分10
17秒前
爱吃糖糖完成签到 ,获得积分10
18秒前
ww完成签到,获得积分10
19秒前
ccob完成签到,获得积分10
19秒前
坐看云起完成签到,获得积分10
21秒前
无欲无求傻傻完成签到,获得积分10
22秒前
非我完成签到 ,获得积分10
22秒前
33完成签到 ,获得积分10
22秒前
秦时明月完成签到,获得积分10
23秒前
背水完成签到 ,获得积分10
23秒前
芋圆完成签到,获得积分10
23秒前
24秒前
叶123完成签到,获得积分10
26秒前
28秒前
子车谷波完成签到,获得积分10
29秒前
菠萝蜜完成签到,获得积分10
29秒前
紧张的砖头完成签到,获得积分10
30秒前
苹果发夹完成签到 ,获得积分10
30秒前
leaf完成签到 ,获得积分10
31秒前
31秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Immigrant Incorporation in East Asian Democracies 600
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
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 3968578
求助须知:如何正确求助?哪些是违规求助? 3513406
关于积分的说明 11167631
捐赠科研通 3248853
什么是DOI,文献DOI怎么找? 1794499
邀请新用户注册赠送积分活动 875150
科研通“疑难数据库(出版商)”最低求助积分说明 804671