[1]马剑飞,龚淑云,李向全,等.交通荷载下深圳软土的变形及微结构演化特征[J].深圳大学学报理工版,2018,35(4):398-404.[doi:10.3724/SP.J.1249.2018.04398]
　MA Jianfei,GONG Shuyun,LI Xiangquan,et al.Deformation and microstructure characteristics of clays of Shenzhen under traffic loading[J].Journal of Shenzhen University Science and Engineering,2018,35(4):398-404.[doi:10.3724/SP.J.1249.2018.04398]
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交通荷载下深圳软土的变形及微结构演化特征()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第35卷
期数:
2018年第4期
页码:
398-404
栏目:
土木建筑工程
出版日期:
2018-07-10

文章信息/Info

Title:
Deformation and microstructure characteristics of clays of Shenzhen under traffic loading
作者:
马剑飞1; 龚淑云2; 李向全1; 卢薇艳2
1）中国地质科学院水文地质环境地质研究所，河北石家庄 050061；2）深圳市地质局，广东深圳 518023
Author(s):
MA Jianfei1;  GONG Shuyun2;  LI Xiangquan1;  and LU Weiyan2
1) Institute of Hydrology & Environmental Geology, CAGS, Shijiazhuang 050061, Hebei Province, P.R.China 2) Shenzhen Geology Bureau, Shenzhen 518023, Guangdong Province, P.R.China
关键词:
土力学; 软土; 动荷载; 轴向应变; 微观结构; 演化特征
Keywords:
soil mechanics;  clay;  dynamic load;  axial strain;  microstructure;  evolution characteristics
分类号:
TU 43
DOI:
10.3724/SP.J.1249.2018.04398
文献标志码:
A
摘要:
为探讨交通荷载作用下软土变形特征及微结构演化，对深圳前海地区软土进行动三轴试验，并将试验后的土样进行微结构制样及电镜扫描，解释动三轴试验中土样的变形机理. 动三轴和微观结构测试结果表明，临界动应力比随试验条件而变化，围压增加，软土临界动应力比减小，振动频率增加，临界动应力比增加. 当动应力比小于临界动应力比时，随着动应力比增加，孔隙受到压缩而趋于扁平化，累积轴向应变增加. 而相同动应力比条件下，轴向应变随振动频率增加而减小，随有效固结围压增加而降低. 超过临界动应力比后，土体原结构发生破坏，颗粒重新排列导致孔隙普遍加大，孔隙扁平化加剧.
Abstract:
Dynamic triaxial test are performed for clays from Qianhai District in Shenzhen in order to study the deformation properties and the microstructure characteristics of clays under traffic loads. Samples are sliced and scanned by scanning electron microscope after the dynamic triaxial test. Qualitative and quantitative researches of microstructure are performed to interpret deformation mechanism. The results show that the critical cyclic stress ratios change with conditions of test. With the increase of confining pressure and the decrease of vibration frequency, the critical cyclic stress ratios will be decrease. When the cyclic stress ratio is less than the critical value, with the increase of cyclic stress ratio, pores are compressed and axial accumulative strain trends to increase. Axial accumulative strain decreases with the increasing of vibration frequency and confining pressure under the same of cyclic stress ratio. However, if the cyclic stress ratios are greater than the critical one, particles of the samples will rearrange, the pore area will expand and flatten intensively. Structure of sample will be broken consequently.

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更新日期/Last Update: 2018-06-20