Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls

Kirsten Malte Iversen, Benjaminn Nordahl Nielsen, Anders Hust Augustesen

Research output: Book/ReportReportResearchpeer-review

2066 Downloads (Pure)

Abstract

Long sheet pile walls are constructed in the cities as an integrated part of deep excavations for e.g. parking lots, pumping stations, reservoirs, and cut and cover tunnels. To minimise costs, the strength of the soil needs to be determined in the best possible way. The drained strength of clay expressed by c and ϕ is often estimated as c 10% = 10%・cu, and found by estimations based on the soil describtion, respectively. However, due to possible slicken slides and tension cracks, c = 0 is used on the back side of the sheet pile wall. This reduces the strength significantly. A parametric study is made on the effective cohesion to investigate the influence of c when designing sheet pile walls. Aalborg Clay is used as a case material. The parametric study is made in both a commercial finite element program and by use of Brinch Hansen’s earth pressure theory. In both studies, the analyses are made based on soil pressures only. The finite element analyses show that the safety factors increase with increasing cohesion. The safety factor is defined as the ratio of the surface load applied on the back side to the surface load applied at failure. Brinch Hansen’s earth pressure theory indicates that the height, anchor force, and the maximum bending moment in the wall can be lowered significantly when the effective cohesion is increased above zero. However, as the cohesion increases, the drop in the moment levels off, which implies that the benefit obtained from investigations increasing the cohesion more than c10% is small.
Original languageEnglish
Place of PublicationAalborg
PublisherDepartment of Civil Engineering, Aalborg University
Number of pages18
Publication statusPublished - 2010
SeriesDCE Technical reports
Number93

Fingerprint

cohesion
pile
earth pressure
safety
cut and cover
clay
soil
parking
anchor
pumping
excavation
crack
tunnel
effect
cost

Keywords

  • Sheet Pile Walls
  • Clay
  • Numerical Model
  • Bending Moment
  • Cohesion
  • Soil Strength

Cite this

Iversen, K. M., Nielsen, B. N., & Augustesen, A. H. (2010). Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls. Aalborg: Department of Civil Engineering, Aalborg University. DCE Technical reports, No. 93
Iversen, Kirsten Malte ; Nielsen, Benjaminn Nordahl ; Augustesen, Anders Hust. / Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls. Aalborg : Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 93).
@book{bdf9ae02f5c24e2eaed18f09cfa8f7c4,
title = "Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls",
abstract = "Long sheet pile walls are constructed in the cities as an integrated part of deep excavations for e.g. parking lots, pumping stations, reservoirs, and cut and cover tunnels. To minimise costs, the strength of the soil needs to be determined in the best possible way. The drained strength of clay expressed by c and ϕ is often estimated as c 10{\%} = 10{\%}・cu, and found by estimations based on the soil describtion, respectively. However, due to possible slicken slides and tension cracks, c = 0 is used on the back side of the sheet pile wall. This reduces the strength significantly. A parametric study is made on the effective cohesion to investigate the influence of c when designing sheet pile walls. Aalborg Clay is used as a case material. The parametric study is made in both a commercial finite element program and by use of Brinch Hansen’s earth pressure theory. In both studies, the analyses are made based on soil pressures only. The finite element analyses show that the safety factors increase with increasing cohesion. The safety factor is defined as the ratio of the surface load applied on the back side to the surface load applied at failure. Brinch Hansen’s earth pressure theory indicates that the height, anchor force, and the maximum bending moment in the wall can be lowered significantly when the effective cohesion is increased above zero. However, as the cohesion increases, the drop in the moment levels off, which implies that the benefit obtained from investigations increasing the cohesion more than c10{\%} is small.",
keywords = "Sheet Pile Walls, Soil Strength, Clay, Cohesion, Numerical Model, Bending Moment, PLAXIS, Sheet Pile Walls, Clay, Numerical Model, Bending Moment, Cohesion, Soil Strength",
author = "Iversen, {Kirsten Malte} and Nielsen, {Benjaminn Nordahl} and Augustesen, {Anders Hust}",
year = "2010",
language = "English",
series = "DCE Technical reports",
publisher = "Department of Civil Engineering, Aalborg University",
number = "93",
address = "Denmark",

}

Iversen, KM, Nielsen, BN & Augustesen, AH 2010, Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls. DCE Technical reports, no. 93, Department of Civil Engineering, Aalborg University, Aalborg.

Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls. / Iversen, Kirsten Malte; Nielsen, Benjaminn Nordahl; Augustesen, Anders Hust.

Aalborg : Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 93).

Research output: Book/ReportReportResearchpeer-review

TY - RPRT

T1 - Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls

AU - Iversen, Kirsten Malte

AU - Nielsen, Benjaminn Nordahl

AU - Augustesen, Anders Hust

PY - 2010

Y1 - 2010

N2 - Long sheet pile walls are constructed in the cities as an integrated part of deep excavations for e.g. parking lots, pumping stations, reservoirs, and cut and cover tunnels. To minimise costs, the strength of the soil needs to be determined in the best possible way. The drained strength of clay expressed by c and ϕ is often estimated as c 10% = 10%・cu, and found by estimations based on the soil describtion, respectively. However, due to possible slicken slides and tension cracks, c = 0 is used on the back side of the sheet pile wall. This reduces the strength significantly. A parametric study is made on the effective cohesion to investigate the influence of c when designing sheet pile walls. Aalborg Clay is used as a case material. The parametric study is made in both a commercial finite element program and by use of Brinch Hansen’s earth pressure theory. In both studies, the analyses are made based on soil pressures only. The finite element analyses show that the safety factors increase with increasing cohesion. The safety factor is defined as the ratio of the surface load applied on the back side to the surface load applied at failure. Brinch Hansen’s earth pressure theory indicates that the height, anchor force, and the maximum bending moment in the wall can be lowered significantly when the effective cohesion is increased above zero. However, as the cohesion increases, the drop in the moment levels off, which implies that the benefit obtained from investigations increasing the cohesion more than c10% is small.

AB - Long sheet pile walls are constructed in the cities as an integrated part of deep excavations for e.g. parking lots, pumping stations, reservoirs, and cut and cover tunnels. To minimise costs, the strength of the soil needs to be determined in the best possible way. The drained strength of clay expressed by c and ϕ is often estimated as c 10% = 10%・cu, and found by estimations based on the soil describtion, respectively. However, due to possible slicken slides and tension cracks, c = 0 is used on the back side of the sheet pile wall. This reduces the strength significantly. A parametric study is made on the effective cohesion to investigate the influence of c when designing sheet pile walls. Aalborg Clay is used as a case material. The parametric study is made in both a commercial finite element program and by use of Brinch Hansen’s earth pressure theory. In both studies, the analyses are made based on soil pressures only. The finite element analyses show that the safety factors increase with increasing cohesion. The safety factor is defined as the ratio of the surface load applied on the back side to the surface load applied at failure. Brinch Hansen’s earth pressure theory indicates that the height, anchor force, and the maximum bending moment in the wall can be lowered significantly when the effective cohesion is increased above zero. However, as the cohesion increases, the drop in the moment levels off, which implies that the benefit obtained from investigations increasing the cohesion more than c10% is small.

KW - Sheet Pile Walls

KW - Soil Strength

KW - Clay

KW - Cohesion

KW - Numerical Model

KW - Bending Moment

KW - PLAXIS

KW - Sheet Pile Walls

KW - Clay

KW - Numerical Model

KW - Bending Moment

KW - Cohesion

KW - Soil Strength

M3 - Report

T3 - DCE Technical reports

BT - Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls

PB - Department of Civil Engineering, Aalborg University

CY - Aalborg

ER -

Iversen KM, Nielsen BN, Augustesen AH. Investigation on the Effect of Drained Strength when Designing Sheet Pile Walls. Aalborg: Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 93).