Acceleration of Debris Flow Due to Granular Effect

Pore water pressure has been recognized as an important factor to enhance the mobility of debris flow moving in channel of very gentle slope. The creation and dissipation of pore water pressure are associated with interaction between grains. This study proposes a physical model for the pressure on m...

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Autores principales:	Taiqiang Yang, Yong Li, Xiaojun Guo, Jun Zhang, Yu Jiang, Xuemei Liu, Jingjing Liu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	debris flow excess pore pressure stress distribution mobility self-acceleration effect Science Q
Acceso en línea:	https://doaj.org/article/114b8254837b493aa3cc7db2efdcdb08
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spelling	oai:doaj.org-article:114b8254837b493aa3cc7db2efdcdb082021-11-08T12:17:37ZAcceleration of Debris Flow Due to Granular Effect2296-646310.3389/feart.2021.660605https://doaj.org/article/114b8254837b493aa3cc7db2efdcdb082021-05-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.660605/fullhttps://doaj.org/toc/2296-6463Pore water pressure has been recognized as an important factor to enhance the mobility of debris flow moving in channel of very gentle slope. The creation and dissipation of pore water pressure are associated with interaction between grains. This study proposes a physical model for the pressure on mobility of flows with different granular configurations: the flow with overlying coarse-grained layer (i.e., inverse grading) and the flow with fully-mixed grains. The flow velocity is derived by the effective stress principle and the relationship between acceleration and pore water pressure is analyzed under different conditions. The results show that a high excess pore water pressure leads to high velocity of flow, and the pressure increases during the movement; and acceleration increases with time and flow depth under given pore water pressure. Moreover, compared with the flow with mixed grains, the flow with overlying coarse-grained layer is more effective to promote the excess pore water pressure and the liquefaction slip surface. Therefore, the internal drag reduction due to pore water pressure produces an acceleration effect on the flow.Taiqiang YangTaiqiang YangYong LiXiaojun GuoXiaojun GuoJun ZhangJun ZhangYu JiangXuemei LiuXuemei LiuXuemei LiuJingjing LiuFrontiers Media S.A.articledebris flowexcess pore pressurestress distributionmobilityself-acceleration effectScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	debris flow excess pore pressure stress distribution mobility self-acceleration effect Science Q
spellingShingle	debris flow excess pore pressure stress distribution mobility self-acceleration effect Science Q Taiqiang Yang Taiqiang Yang Yong Li Xiaojun Guo Xiaojun Guo Jun Zhang Jun Zhang Yu Jiang Xuemei Liu Xuemei Liu Xuemei Liu Jingjing Liu Acceleration of Debris Flow Due to Granular Effect
description	Pore water pressure has been recognized as an important factor to enhance the mobility of debris flow moving in channel of very gentle slope. The creation and dissipation of pore water pressure are associated with interaction between grains. This study proposes a physical model for the pressure on mobility of flows with different granular configurations: the flow with overlying coarse-grained layer (i.e., inverse grading) and the flow with fully-mixed grains. The flow velocity is derived by the effective stress principle and the relationship between acceleration and pore water pressure is analyzed under different conditions. The results show that a high excess pore water pressure leads to high velocity of flow, and the pressure increases during the movement; and acceleration increases with time and flow depth under given pore water pressure. Moreover, compared with the flow with mixed grains, the flow with overlying coarse-grained layer is more effective to promote the excess pore water pressure and the liquefaction slip surface. Therefore, the internal drag reduction due to pore water pressure produces an acceleration effect on the flow.
format	article
author	Taiqiang Yang Taiqiang Yang Yong Li Xiaojun Guo Xiaojun Guo Jun Zhang Jun Zhang Yu Jiang Xuemei Liu Xuemei Liu Xuemei Liu Jingjing Liu
author_facet	Taiqiang Yang Taiqiang Yang Yong Li Xiaojun Guo Xiaojun Guo Jun Zhang Jun Zhang Yu Jiang Xuemei Liu Xuemei Liu Xuemei Liu Jingjing Liu
author_sort	Taiqiang Yang
title	Acceleration of Debris Flow Due to Granular Effect
title_short	Acceleration of Debris Flow Due to Granular Effect
title_full	Acceleration of Debris Flow Due to Granular Effect
title_fullStr	Acceleration of Debris Flow Due to Granular Effect
title_full_unstemmed	Acceleration of Debris Flow Due to Granular Effect
title_sort	acceleration of debris flow due to granular effect
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/114b8254837b493aa3cc7db2efdcdb08
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Acceleration of Debris Flow Due to Granular Effect

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