Study on GMZ bentonite-sand mixture by undrained triaxial tests
It is particularly necessary to study the deformation, strength and the changes of pore water pressure of bentonite-based buffer/backfill materials under the undrained condition. A series of isotropic compression tests and triaxial shear tests under undrained conditions were conducted on the compact...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2016-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/e3sconf/20160918006 |
| _version_ | 1819173138711183360 |
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| author | Sun Wen-jing Chen Chao Liu Shi-qing Sun De-an Liang Xue-hai Tan Yun-Zhi Fatahi Behzad |
| author_facet | Sun Wen-jing Chen Chao Liu Shi-qing Sun De-an Liang Xue-hai Tan Yun-Zhi Fatahi Behzad |
| author_sort | Sun Wen-jing |
| collection | DOAJ |
| description | It is particularly necessary to study the deformation, strength and the changes of pore water pressure of bentonite-based buffer/backfill materials under the undrained condition. A series of isotropic compression tests and triaxial shear tests under undrained conditions were conducted on the compacted saturated/unsaturated GMZ bentonite-sand mixtures with dry mass ratio of bentonite/sand of 30:70. During the tests, the images of the sample were collected by photographic equipment and subsequently were cropped, binarized and centroids marked by image processing technique. Based on identification of the variation of the position of marked centroids, the deformation of the sample can be determined automatically in real-time. Finally, the hydro-mechanical behaviour of saturated and unsaturated bentonite-sand mixtures under the undrained condition can be obtained. From results of triaxial shear tests on unsaturated samples under constant water content, inflated volumetric deformation transforms to contractive volumetric deformation due to the increase of the confining pressure and lateral expansion deformation are observed due to the increase in the shearing stress. Moreover, the net mean stress affects the initial stiffness, undrained shear strength and deformation of the sample during the undrained shear tests. |
| first_indexed | 2024-12-22T20:18:19Z |
| format | Article |
| id | doaj.art-178e583cb92d49d186a7f524871ba2ce |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-22T20:18:19Z |
| publishDate | 2016-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-178e583cb92d49d186a7f524871ba2ce2022-12-21T18:13:55ZengEDP SciencesE3S Web of Conferences2267-12422016-01-0191800610.1051/e3sconf/20160918006e3sconf_eunsat2016_18006Study on GMZ bentonite-sand mixture by undrained triaxial testsSun Wen-jingChen Chao0Liu Shi-qing1Sun De-an2Liang Xue-hai3Tan Yun-Zhi4Fatahi Behzad5Civil Engineering Department, Shanghai UniversityCivil Engineering Department, Shanghai UniversityCivil Engineering Department, Shanghai UniversityCivil Engineering Department, Shanghai UniversityCollege of civil engineering＆architecture, China Three Gorges UniversityCentre for Built Infrastructure Research, School of Civil and Environmental Engineering, Faculty of Engineering and IT, University of TechnologyIt is particularly necessary to study the deformation, strength and the changes of pore water pressure of bentonite-based buffer/backfill materials under the undrained condition. A series of isotropic compression tests and triaxial shear tests under undrained conditions were conducted on the compacted saturated/unsaturated GMZ bentonite-sand mixtures with dry mass ratio of bentonite/sand of 30:70. During the tests, the images of the sample were collected by photographic equipment and subsequently were cropped, binarized and centroids marked by image processing technique. Based on identification of the variation of the position of marked centroids, the deformation of the sample can be determined automatically in real-time. Finally, the hydro-mechanical behaviour of saturated and unsaturated bentonite-sand mixtures under the undrained condition can be obtained. From results of triaxial shear tests on unsaturated samples under constant water content, inflated volumetric deformation transforms to contractive volumetric deformation due to the increase of the confining pressure and lateral expansion deformation are observed due to the increase in the shearing stress. Moreover, the net mean stress affects the initial stiffness, undrained shear strength and deformation of the sample during the undrained shear tests.http://dx.doi.org/10.1051/e3sconf/20160918006 |
| spellingShingle | Sun Wen-jing Chen Chao Liu Shi-qing Sun De-an Liang Xue-hai Tan Yun-Zhi Fatahi Behzad Study on GMZ bentonite-sand mixture by undrained triaxial tests E3S Web of Conferences |
| title | Study on GMZ bentonite-sand mixture by undrained triaxial tests |
| title_full | Study on GMZ bentonite-sand mixture by undrained triaxial tests |
| title_fullStr | Study on GMZ bentonite-sand mixture by undrained triaxial tests |
| title_full_unstemmed | Study on GMZ bentonite-sand mixture by undrained triaxial tests |
| title_short | Study on GMZ bentonite-sand mixture by undrained triaxial tests |
| title_sort | study on gmz bentonite sand mixture by undrained triaxial tests |
| url | http://dx.doi.org/10.1051/e3sconf/20160918006 |
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