Análise de Estabilidade de Muros de Contenção de Alvenaria por Método de Equilíbrio Limite com Verificação com Ensaios de Carga

Conferência Brasileira sobre Estabilidade de Encostas

Translated title of the contribution: Stability Analysis of a Masonry Retaining Wall by a Limit Equilibrium Method with Loading Test Verification

Lucas Oliveira Mendes, Jonathan Dewsbury, Kevin Briggs

Research output: Contribution to conferencePaper

Abstract

Masonry retaining walls represent an antique construction technique which can be seen across several countries, most of them incorporated into modern buildings. With regard to stability analysis, such structures are considered as monolithic blocks, and most times discontinuities between bricks and internal deformations are neglected. Therefore, this paper aims to verify alternative methods of analysis of such structures, taking into consideration friction between bricks and possible deformations. For this, a masonry retaining was studied, 5 m high, located in the district of Deptford, London. In a numerical way, it was used a limit-equilibrium method proposed by Alejano et al (2012a), which assumes that the wall is built with cuboid bricks, and their stability is guaranteed by their self-weight, and the forces are calculated for each row of bricks. Initially, the wall was considered as a monolithic block, subjected to active pressure and under two groundwater conditions, the most probable and the worst ones. It was noted that the plot for the factor of safety as a function of friction angle may be adjusted by a linear function in a case of overturning; for sliding, the factor of safety tends to a vertical asymptote. Experimentally, six loading tests were conducted for a 1:20 scale model of the wall sculptured in a timber box, where the load was applied in the backfill. The model was moulded following three layouts: a monolithic block and other two models split into 5 and 15 pieces. Also, fine sand was used as backfill and the toe of the wall was settled in a layer of coarse sand. As a result, it was noted that overturning is the main mechanism of rupture in the case of monolithic block, whereas for the other two layouts the model tends to deform before producing a mechanism of overturning or sliding
Original languagePortuguese
Publication statusPublished - 2017

Fingerprint

Retaining walls
Brick
Sand
Friction
Timber
Groundwater

Cite this

@conference{1644e43788374806a4bf8011939c6c41,
title = "An{\'a}lise de Estabilidade de Muros de Conten{\cc}{\~a}o de Alvenaria por M{\'e}todo de Equil{\'i}brio Limite com Verifica{\cc}{\~a}o com Ensaios de Carga: Confer{\^e}ncia Brasileira sobre Estabilidade de Encostas",
abstract = "Masonry retaining walls represent an antique construction technique which can be seen across several countries, most of them incorporated into modern buildings. With regard to stability analysis, such structures are considered as monolithic blocks, and most times discontinuities between bricks and internal deformations are neglected. Therefore, this paper aims to verify alternative methods of analysis of such structures, taking into consideration friction between bricks and possible deformations. For this, a masonry retaining was studied, 5 m high, located in the district of Deptford, London. In a numerical way, it was used a limit-equilibrium method proposed by Alejano et al (2012a), which assumes that the wall is built with cuboid bricks, and their stability is guaranteed by their self-weight, and the forces are calculated for each row of bricks. Initially, the wall was considered as a monolithic block, subjected to active pressure and under two groundwater conditions, the most probable and the worst ones. It was noted that the plot for the factor of safety as a function of friction angle may be adjusted by a linear function in a case of overturning; for sliding, the factor of safety tends to a vertical asymptote. Experimentally, six loading tests were conducted for a 1:20 scale model of the wall sculptured in a timber box, where the load was applied in the backfill. The model was moulded following three layouts: a monolithic block and other two models split into 5 and 15 pieces. Also, fine sand was used as backfill and the toe of the wall was settled in a layer of coarse sand. As a result, it was noted that overturning is the main mechanism of rupture in the case of monolithic block, whereas for the other two layouts the model tends to deform before producing a mechanism of overturning or sliding",
author = "{Oliveira Mendes}, Lucas and Jonathan Dewsbury and Kevin Briggs",
year = "2017",
language = "Portuguese",

}

TY - CONF

T1 - Análise de Estabilidade de Muros de Contenção de Alvenaria por Método de Equilíbrio Limite com Verificação com Ensaios de Carga

T2 - Conferência Brasileira sobre Estabilidade de Encostas

AU - Oliveira Mendes, Lucas

AU - Dewsbury, Jonathan

AU - Briggs, Kevin

PY - 2017

Y1 - 2017

N2 - Masonry retaining walls represent an antique construction technique which can be seen across several countries, most of them incorporated into modern buildings. With regard to stability analysis, such structures are considered as monolithic blocks, and most times discontinuities between bricks and internal deformations are neglected. Therefore, this paper aims to verify alternative methods of analysis of such structures, taking into consideration friction between bricks and possible deformations. For this, a masonry retaining was studied, 5 m high, located in the district of Deptford, London. In a numerical way, it was used a limit-equilibrium method proposed by Alejano et al (2012a), which assumes that the wall is built with cuboid bricks, and their stability is guaranteed by their self-weight, and the forces are calculated for each row of bricks. Initially, the wall was considered as a monolithic block, subjected to active pressure and under two groundwater conditions, the most probable and the worst ones. It was noted that the plot for the factor of safety as a function of friction angle may be adjusted by a linear function in a case of overturning; for sliding, the factor of safety tends to a vertical asymptote. Experimentally, six loading tests were conducted for a 1:20 scale model of the wall sculptured in a timber box, where the load was applied in the backfill. The model was moulded following three layouts: a monolithic block and other two models split into 5 and 15 pieces. Also, fine sand was used as backfill and the toe of the wall was settled in a layer of coarse sand. As a result, it was noted that overturning is the main mechanism of rupture in the case of monolithic block, whereas for the other two layouts the model tends to deform before producing a mechanism of overturning or sliding

AB - Masonry retaining walls represent an antique construction technique which can be seen across several countries, most of them incorporated into modern buildings. With regard to stability analysis, such structures are considered as monolithic blocks, and most times discontinuities between bricks and internal deformations are neglected. Therefore, this paper aims to verify alternative methods of analysis of such structures, taking into consideration friction between bricks and possible deformations. For this, a masonry retaining was studied, 5 m high, located in the district of Deptford, London. In a numerical way, it was used a limit-equilibrium method proposed by Alejano et al (2012a), which assumes that the wall is built with cuboid bricks, and their stability is guaranteed by their self-weight, and the forces are calculated for each row of bricks. Initially, the wall was considered as a monolithic block, subjected to active pressure and under two groundwater conditions, the most probable and the worst ones. It was noted that the plot for the factor of safety as a function of friction angle may be adjusted by a linear function in a case of overturning; for sliding, the factor of safety tends to a vertical asymptote. Experimentally, six loading tests were conducted for a 1:20 scale model of the wall sculptured in a timber box, where the load was applied in the backfill. The model was moulded following three layouts: a monolithic block and other two models split into 5 and 15 pieces. Also, fine sand was used as backfill and the toe of the wall was settled in a layer of coarse sand. As a result, it was noted that overturning is the main mechanism of rupture in the case of monolithic block, whereas for the other two layouts the model tends to deform before producing a mechanism of overturning or sliding

M3 - Paper

ER -