必须声明标量变量 "@Script_ID"。 南京粉砂三轴压缩过程中的三维孔隙结构演化特征-《地球科学与环境学报》
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[1]曹剑秋,张巍,肖瑞,等.南京粉砂三轴压缩过程中的三维孔隙结构演化特征[J].地球科学与环境学报,2018,40(04):487-496.
 CAO Jian-qiu,ZHANG Wei,XIAO Rui,et al.Characteristics of 3D Pore Structure Evolution of Nanjing Silty Sand During the Triaxial Compression[J].Journal of Earth Sciences and Environment,2018,40(04):487-496.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第40卷
期数:
2018年第04期
页码:
487-496
栏目:
工程地质
出版日期:
2018-07-15

文章信息/Info

Title:
Characteristics of 3D Pore Structure Evolution of Nanjing Silty Sand During the Triaxial Compression
文章编号:
1672-6561(2018)04-0487-10
作者:
曹剑秋张巍肖瑞梁小龙许林李恒震
1.南京大学 地球科学与工程学院,江苏 南京 210023; 2.南京大学(苏州)高新技术研究院,江苏 苏州 215123
Author(s):
CAO Jian-qiu ZHANG Wei XIAO Rui LIANG Xiao-long XU Lin LI Heng-zhen
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;  2. Nanjing University (Suzhou) High Technology Research Institute, Suzhou 215123, Jiangsu, China
关键词:
地质工程南京粉砂显微CT三轴剪切试验孔隙结构三维重构表征单元体
Keywords:
geological engineering Nanjing silty sand microCT triaxial shear test pore structure 3D reconstruction representative elementary volume
分类号:
P642.3;P642.1
DOI:
-
文献标志码:
A
摘要:
砂土三轴剪切过程中细观孔隙结构演化与其宏观力学性质之间存在着紧密联系。基于南京大学自主研发的微型三轴仪,对南京粉砂试样进行了三轴剪切试验,利用显微CT扫描,获得了加载过程中试样的三维孔隙结构演化特征。结果表明:试样表现出应变软化-硬化型的应力-应变关系曲线;端部摩擦阻碍试样体积膨胀,发生鼓形区状破坏;试样整体体孔隙率从初始的46.3%减小到40.9%,后增大到43.0%附近,且试样破坏区孔隙率显著增大;统计区状破坏区表征单元体孔隙参数,发现破坏前孔隙被压密消失,孔隙数量减少32.4%,平均孔隙半径减小48.8%,导致孔隙半径分布趋于集中,破坏后破坏区域内出现大量大半径的孔隙;颗粒间错动导致颗粒棱角破碎,使孔隙形状趋于规则。
Abstract:
A close relationship exists between the evolution of micro pore structure and macro mechanical properties of sand during the triaxial shear test. The micro-triaxial shear apparatus developed by Nanjing University was used to perform the triaxial shear test on Nanjing silty sand; micro-CT scanning was used to obtain the evolution features of 3D pore structure of the specimen during the loading. The results show that the specimen exhibits strain softening-hardening-type characteristic of stress-strain curve; the friction at both ends of the sample impedes the specimen’s volume expansion, causing the drum type zone destruction occurring in the specimen; the porosity of specimen decreases from 46.3% to 40.9%, then increases to about 43.0%, and the porosity of failure zone increases obviously; according to the pore parameters of representative elementary volume of zone destruction area, the pores are compressed before failure, causing a decrease of the pore number by 32.4% and a decrease of the average pore radius by 48.8%, so that there are a concentration of the distribution of pore radius, and a good amount of pores with large pore radius occur in the post-failure zone; the dislocation of particles makes the edges of the particles broken, causing the pore shape tends to be regular.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-03-12;修回日期:2018-05-01
基金项目:国家自然科学基金项目(41230636,40902076);江苏省自然科学基金项目(BK20160366);苏州市科技计划项目(SYG201611)
作者简介:曹剑秋(1994-),男,辽宁本溪人,工学硕士研究生,E-mail:mf1729002@smail.nju.edu.cn。
通讯作者:张 巍(1974-),男,北京市人,副教授,工学博士,E-mail:wzhang@nju.edu.cn。
更新日期/Last Update: 2018-07-27