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[1]冀卫东,李亚杰,王旭东.反压饱和对砂土力学特性影响的试验研究[J].南京工业大学学报(自然科学版),2018,40(04):86-90.[doi:10.3969/j.issn.1671-7627.2018.04.014]
 JI Weidong,LI Yajie,WANG Xudong.Experimentalal study for influence of back pressure saturation on mechanical properties of sand[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(04):86-90.[doi:10.3969/j.issn.1671-7627.2018.04.014]
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反压饱和对砂土力学特性影响的试验研究()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
40
期数:
2018年04期
页码:
86-90
栏目:
出版日期:
2018-07-20

文章信息/Info

Title:
Experimentalal study for influence of back pressure saturation on mechanical properties of sand
文章编号:
1671-7627(2018)04-0086-05
作者:
冀卫东李亚杰王旭东
南京工业大学 岩土工程研究所,江苏 南京 210009
Author(s):
JI WeidongLI YajieWANG Xudong
Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
反压 饱和度 砂土 强度 三轴试验
Keywords:
back pressure saturation degree sand shear strength triaxle test
分类号:
P411
DOI:
10.3969/j.issn.1671-7627.2018.04.014
文献标志码:
A
摘要:
在三轴试验中,反压饱和是一种增加试样饱和度的常见方法,但是现行规范中对三轴试样反压取值没有明确的要求。为了探讨反压饱和对砂土力学特性的影响,采用福建标准砂开展了一系列固结不排水和固结排水三轴试验,获得了反压与饱和度的关系,得到了反压作用下砂土的偏应力、孔隙水压力和体积应变的变化规律,探讨了反压对砂土强度影响的原因。结果表明:砂样的饱和度随施加的反压增大呈非线性增大; 对于固结不排水剪切试验,施加的反压越大,产生负的超静孔隙水压力越大,造成有效围压越大,导致砂样的峰值强度增大; 而在固结排水剪切试验中,反压对砂土的强度和体积应变基本没有影响。
Abstract:
In the triaxle test,the back pressure saturation was a way to increase the saturation of the sample,but there was no specific regulation on the value of the back pressure for the sample.In order to investigate the influence of back pressure saturation on the mechanical properties of sand,a series of consolidated undrained and consolidated drained triaxle tests were carried out by using Fujian standard sand.The relationship between back pressure and saturation,and the variation law of deviatoric stress,pore pressure and volumetric strain of sand under the action of back pressure were obtained.The influence of back pressure on the strength of sand was discussed.Results showed that the sample saturation was nonlinear with increasing applied back pressure.For the consolidated undrained test,the greater the back pressure,the greater the negative excess pore pressure,and the confining pressure would increase with the peak strength of sand.For the consolidated drained test,back pressure did not affect the strength and the volumetric strain of sand.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2017-04-25
基金项目:国家自然科学基金(41272303); 江苏省六大人才高峰基金(09-F-004)
作者简介:冀卫东(1991—),男,宁夏固原人,硕士,主要研究方向为岩土工程; 王旭东(联系人),教授,E-mail:cewxd@njtech.edu.cn.
引用本文:冀卫东,李亚杰,王旭东.反压饱和对砂土力学特性影响的试验研究[J].南京工业大学学报(自然科学版),2018,40(4):86-90..
更新日期/Last Update: 2018-07-30