Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil

Introduction: The soil in geogrid-reinforced structures is typically unsaturated, with the shear strength provided by both the matrix suction and the reinforced body. Traditional structural designs for saturated soils only consider the shear strength provided by the reinforced body, neglecting the p...

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Main Authors: Xiangwen Deng, Zhengyu Zhu, Xi yang Lin, Xue qiang Yang
Format: Article
Language:English
Published: Frontiers Media S.A. 2023-11-01
Series:Frontiers in Materials
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/fmats.2023.1284722/full
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author Xiangwen Deng
Zhengyu Zhu
Xi yang Lin
Xue qiang Yang
author_facet Xiangwen Deng
Zhengyu Zhu
Xi yang Lin
Xue qiang Yang
author_sort Xiangwen Deng
collection DOAJ
description Introduction: The soil in geogrid-reinforced structures is typically unsaturated, with the shear strength provided by both the matrix suction and the reinforced body. Traditional structural designs for saturated soils only consider the shear strength provided by the reinforced body, neglecting the part provided by matrix suction. As a result, the design for reinforced structures is biased toward conservatism.Method: The study examined the matrix suction-provided shear strength in reinforced soils through strain-controlled triaxial and soil-water characteristic curve (SWCC) pressure plate instrumentation. The feasibility of the Schrefler and Khalili unsaturated soil shear strength formulas for predicting shear strength based on matrix suction forces was verified.Results: The study revealed that the cohesion of saturated reinforced soil exhibits a significant decrease in contrast with unsaturated reinforced soil, with matrix suction serving as a crucial consideration for reinforced structure design.Discussion: The experimental results confirm the suitability of applying the quasi-cohesion increment theory to reinforced clays. The Khalili formula can be utilized to predict the quasi cohesion of unsaturated reinforced soils with greater accuracy under diverse dry density conditions. The results obtained using post-shear moisture content were closer to the measured values than those using initial moisture content.
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spelling doaj.art-9c0946f3caaf42d9abc19a51272fdabf2023-11-03T09:06:14ZengFrontiers Media S.A.Frontiers in Materials2296-80162023-11-011010.3389/fmats.2023.12847221284722Effect of matrix suction on the shear strength characteristics of reinforced granite residual soilXiangwen DengZhengyu ZhuXi yang LinXue qiang YangIntroduction: The soil in geogrid-reinforced structures is typically unsaturated, with the shear strength provided by both the matrix suction and the reinforced body. Traditional structural designs for saturated soils only consider the shear strength provided by the reinforced body, neglecting the part provided by matrix suction. As a result, the design for reinforced structures is biased toward conservatism.Method: The study examined the matrix suction-provided shear strength in reinforced soils through strain-controlled triaxial and soil-water characteristic curve (SWCC) pressure plate instrumentation. The feasibility of the Schrefler and Khalili unsaturated soil shear strength formulas for predicting shear strength based on matrix suction forces was verified.Results: The study revealed that the cohesion of saturated reinforced soil exhibits a significant decrease in contrast with unsaturated reinforced soil, with matrix suction serving as a crucial consideration for reinforced structure design.Discussion: The experimental results confirm the suitability of applying the quasi-cohesion increment theory to reinforced clays. The Khalili formula can be utilized to predict the quasi cohesion of unsaturated reinforced soils with greater accuracy under diverse dry density conditions. The results obtained using post-shear moisture content were closer to the measured values than those using initial moisture content.https://www.frontiersin.org/articles/10.3389/fmats.2023.1284722/fullreinforced soilgranite residual soilmatrix suctionshear strengthsoil-water characteristic curve
spellingShingle Xiangwen Deng
Zhengyu Zhu
Xi yang Lin
Xue qiang Yang
Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
Frontiers in Materials
reinforced soil
granite residual soil
matrix suction
shear strength
soil-water characteristic curve
title Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
title_full Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
title_fullStr Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
title_full_unstemmed Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
title_short Effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
title_sort effect of matrix suction on the shear strength characteristics of reinforced granite residual soil
topic reinforced soil
granite residual soil
matrix suction
shear strength
soil-water characteristic curve
url https://www.frontiersin.org/articles/10.3389/fmats.2023.1284722/full
work_keys_str_mv AT xiangwendeng effectofmatrixsuctionontheshearstrengthcharacteristicsofreinforcedgraniteresidualsoil
AT zhengyuzhu effectofmatrixsuctionontheshearstrengthcharacteristicsofreinforcedgraniteresidualsoil
AT xiyanglin effectofmatrixsuctionontheshearstrengthcharacteristicsofreinforcedgraniteresidualsoil
AT xueqiangyang effectofmatrixsuctionontheshearstrengthcharacteristicsofreinforcedgraniteresidualsoil