Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill

The strength characteristics of cemented paste backfill (CPB) in mining areas are key control factors for the safety assessment of overlying strata. A series of experiments about uniaxial compression and triaxial compression were carried out to study the influence of cement content of filling slurry...

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Autores principales:	Zhihong Zhang, Jiacheng Li
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	cemented paste backfill uniaxial compression triaxial compression shear strength failure mode Technology T
Acceso en línea:	https://doaj.org/article/e686bf3bb79741beba6f1874557bab2d
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spelling	oai:doaj.org-article:e686bf3bb79741beba6f1874557bab2d2021-11-15T06:12:57ZExperimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill2296-801610.3389/fmats.2021.792561https://doaj.org/article/e686bf3bb79741beba6f1874557bab2d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmats.2021.792561/fullhttps://doaj.org/toc/2296-8016The strength characteristics of cemented paste backfill (CPB) in mining areas are key control factors for the safety assessment of overlying strata. A series of experiments about uniaxial compression and triaxial compression were carried out to study the influence of cement content of filling slurry, curing age, and curing temperature on strength behavior of CPB specimens. The failure mechanism and damage feature of CPB have been investigated. The results show the following: (1) The uniaxial compressive strength of CPB specimens exhibits an upward trend with the increase of cement content and curing age. When the cement content is high, the uniaxial compressive strength increases sharply with increasing curing age. (2) The cohesion of CPB specimens increases with the increase of cement content of filling slurry, curing age, and curing temperature. The cohesion of CPB specimens with curing age 7 days and 14 days increases linearly with increasing cement content. At the later stage of curing age, the strength growth of high cement content backfill is significantly greater than that of low cement content. The internal friction angle of the filling increases slightly with increasing filling cement content, curing age, and curing temperature. (3) The shear strength of CPB specimens at curing age 7 days exhibits an upward trend with the increase of confining pressure, while the shear strength at 14 days and 28 days curing age decreases slightly as the confining pressure increases. (4) With the increase of cement content in backfill, the brittleness increases significantly when the backfill is damaged. The failure mode of CPB specimens changes from monoclinic section shear failure to X-type failure with increasing curing age, and the failure process is divided into four stages: pore compaction, linear elastic deformation, plastic deformation, and post-peak failure.Zhihong ZhangJiacheng LiFrontiers Media S.A.articlecemented paste backfilluniaxial compressiontriaxial compressionshear strengthfailure modeTechnologyTENFrontiers in Materials, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cemented paste backfill uniaxial compression triaxial compression shear strength failure mode Technology T
spellingShingle	cemented paste backfill uniaxial compression triaxial compression shear strength failure mode Technology T Zhihong Zhang Jiacheng Li Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
description	The strength characteristics of cemented paste backfill (CPB) in mining areas are key control factors for the safety assessment of overlying strata. A series of experiments about uniaxial compression and triaxial compression were carried out to study the influence of cement content of filling slurry, curing age, and curing temperature on strength behavior of CPB specimens. The failure mechanism and damage feature of CPB have been investigated. The results show the following: (1) The uniaxial compressive strength of CPB specimens exhibits an upward trend with the increase of cement content and curing age. When the cement content is high, the uniaxial compressive strength increases sharply with increasing curing age. (2) The cohesion of CPB specimens increases with the increase of cement content of filling slurry, curing age, and curing temperature. The cohesion of CPB specimens with curing age 7 days and 14 days increases linearly with increasing cement content. At the later stage of curing age, the strength growth of high cement content backfill is significantly greater than that of low cement content. The internal friction angle of the filling increases slightly with increasing filling cement content, curing age, and curing temperature. (3) The shear strength of CPB specimens at curing age 7 days exhibits an upward trend with the increase of confining pressure, while the shear strength at 14 days and 28 days curing age decreases slightly as the confining pressure increases. (4) With the increase of cement content in backfill, the brittleness increases significantly when the backfill is damaged. The failure mode of CPB specimens changes from monoclinic section shear failure to X-type failure with increasing curing age, and the failure process is divided into four stages: pore compaction, linear elastic deformation, plastic deformation, and post-peak failure.
format	article
author	Zhihong Zhang Jiacheng Li
author_facet	Zhihong Zhang Jiacheng Li
author_sort	Zhihong Zhang
title	Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
title_short	Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
title_full	Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
title_fullStr	Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
title_full_unstemmed	Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill
title_sort	experimental investigation on strength and failure characteristics of cemented paste backfill
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/e686bf3bb79741beba6f1874557bab2d
work_keys_str_mv	AT zhihongzhang experimentalinvestigationonstrengthandfailurecharacteristicsofcementedpastebackfill AT jiachengli experimentalinvestigationonstrengthandfailurecharacteristicsofcementedpastebackfill
_version_	1718428588863127552

Experimental Investigation on Strength and Failure Characteristics of Cemented Paste Backfill

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