|
|
|
| STUDY OF UNSATURATED COMPACTED SOIL CONSIDERING INFLUENCE OF END EFFECT BY TRIAXIAL TEST |
| (1. School of Civil Engineering and Mechanics，Yanshan University，Qinhuangdao，Hebei 066004，China；2. State Key Laboratory of Structural Analysis for Industrial Equipment，Dalian University of Technology，Dalian，Liaoning 116024，China) |
|
|
|
|
Abstract In the unsaturated compacted soil triaxial tests under controlled suction conditions，the digital image measurement technique is used，with which the strength and deformation behaviours of unsaturated compacted soil can be studied by considering the influence of end effect. The comparison of test results of the overall specimen and 1/3 zone in the middle of specimen under controlled suction reflects that end effect has a little influence on 1/3 zone in the middle of specimen；the test result of this part can better stand for the actual deformation properties of unsaturated soil；and it provides credible test data for the study of unsaturated soil stress-strain relationship. The end effect has great influence on parameters of shear strength formula，when using the double-stress state variable method to analyze the shear strength. The elastoplastic model of Alonso for unsaturated soil is adopted to further analyze the influence of end effect on numerical calculation.
|
|
Received: 19 March 2010
|
|
|
|
| [1] 陈正汉，孙树国，方祥位，等. 非饱和土与特殊土测试技术新进展[J]. 岩土工程学报，2006，28(2)：147–169.(CHEN Zhenghan，SUN Shuguo，FANG Xiangwei，et al. Recent advances of the measuring technology for unsaturated soils and special soils[J]. Chinese Journal of Geotechnical Engineering，2006，28(2)：147–169.(in Chinese))
[2] 邵龙潭，王助贫，韩国城，等. 三轴试验土样径向变形的计算机图像测量[J]. 岩土工程学报，2001，23(3)：337–341.(SHAO Longtan，WANG Zhupin，HAN Guocheng，et al. Digital image processing technique for measurement of the radial deformation of specimen in triaxial test[J]. Chinese Journal of Geotechnical Engineering，2001，23(3)：337–341.(in Chinese))
[3] 邵龙潭，王助贫，刘永禄. 三轴土样局部变形的数字图像测量方法[J]. 岩土工程学报，2002，24(2)：159–163.(SHAO Longtan，WANG Zhupin，LIU Yonglu. Digital image processing technique for measurement of the local deformation of soil specimen in triaxial test[J]. Chinese Journal of Geotechnical Engineering，2002，24(2)：159–163.(in Chinese))
[4] SHAO L T，LIU Y L，DONG J J. Strain measurement of soil specimen in triaxial test with digital image processing technology[C]// Proceedings of the 6th International Symposium on Test and Measurement. Dalian：[s. n.]，2005：4 368–4 371.
[5] SHAO L T，DONG J J，LIU Y L. Deformation measurement of unsaturated soil specimen in suction-controlled triaxial test based on digital image measurement method[C]// Proceedings of the 3rd Asian Conference on Unsaturated Soils. Nanjing：[s. n.]，2007：505–512.
[6] 邵龙潭，董建军，刘永禄，等. 基于亚像素角点检测的试样变形图像测量方法[J]. 岩土力学，2008，29(5)：1 329–1 333.(SHAO Longtan，DONG Jianjun，LIU Yonglu，et al. Digital image measurement method of measuring triaxial specimen deformation based on sub-pixel accurate corner locator[J]. Rock and Soil Mechanics，2008，29(5)：1 329–1 333.(in Chinese))
[7] 董建军，邵龙潭，刘永禄，等. 基于图像测量方法的非饱和压实土三轴试样变形测量[J]. 岩土力学，2008，29(6)：1 618–1 622. (DONG Jianjun，SHAO Longtan，LIU Yonglu，et al. Measurement of deformation of unsaturated compacted soil triaxial specimen based on digital image measurement method[J]. Rock and Soil Mechanics，2008，29(6)：1 618–1 622.(in Chinese))
[8] 董建军. 基于数字图像测量的非饱和压实土应力–应变特性研究[博士学位论文][D]. 大连：大连理工大学，2008.(DONG Jianjun. Study of stress-strain characteristics of unsaturated compacted soil based on digital image measurement[Ph. D. Thesis][D]. Dalian：Dalian University of Technology，2008.(in Chinese))
[9] 董建军，邵龙潭. 基于试样中部变形的p-q-s空间临界状态面试验研究[J]. 岩土工程学报，2009，31(10)：1 607–1 613.(DONG Jianjun，SHAO Longtan. Critical state surface in p-q-s stress space based on deformation of middle part of specimens[J]. Chinese Journal of Geotechnical Engineering，2009，31(10)：1 607–1 613.(in Chinese))
[10] WHEELER S J，SIVAKUMAR V. An elasto-plastic critical state framework for unsaturated soil[J]. Geotechnique，1995，45(1)：35–53.
[11] 袁聚云. 土工试验与原理[M]. 上海：同济大学出版社，2003. (YUAN Juyun. Soil test and principle[M]. Shanghai：Tongji University Press，2003.(in Chinese))
[12] 中华人民共和国行业标准编写组. SL237–1999土工试验规程[S]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Group of People¢s Republic of China. SL237–1999 Specification of soil test[S]. Beijing：China Water Power Press，1999.(in Chinese))
[13] 黄文熙. 土的工程性质[M]. 北京：水利电力出版社，1983.(HUANG Wenxi. Engineering properties of soil[M]. Beijing：Water Resources and Electric Power Press，1983.(in Chinese))
[14] 陈春霖，张惠明. 饱和砂土三轴试验中的若干问题[J]. 岩土工程学报，2000，22(6)：659–663.(CHEN Chunlin，ZHANG Huiming. Some problems in triaxial test on saturated sands[J]. Chinese Journal of Geotechnical Engineering，2000，22(6)：659–663.(in Chinese))
[15] FREDLUND D G，MORGENSTERN N R. Stress state variables for unsaturated soils[J]. Journal of the Geotechnical Engineering Division，ASCE，1977，103(5)：447–466.
[16] FREDLUND D G，MORGENSTERN N R，WIDGER R A. The shear strength of unsaturated soils[J]. Canadian Geotechnical Journal，1978，15(3)：313–321.
[17] FREDLUND D G，MORGENSTEN N R. Constitutive relations for volume change in unsaturated soils[J]. Canadian Geotechnical Journal，1976，13(3)：261–276.
[18] ALONSO E E，GENS A，JOSA A. A constitutive model for partially saturated soils[J]. Geotechnique，1990，40(3)：405–430. |
|
|
|
2010, Vol. 29 
