Effects of restraining conditions on the bearing capacity of footings near slopes

研究成果: Article

1 引文 (Scopus)

摘要

In evaluating the ultimate bearing capacity (q u ) of a strip footing adjacent to a slope, conventional correction formulas for the effect of load eccentricity may not be applicable because these formulas were developed exclusively for footings situated on horizontal grounds, where loads eccentric to opposite sides of the footing yield identical results for q u . In this study, loading tests and analyses are conducted on a strip footing placed adjacent to a model slope with various slope angles. The experimental evidence shows that a load eccentric toward the heel of a footing leads to an increase in bearing capacity, whereas the analytical results based on conventional formulas show the opposite trend. To address this discrepancy, an approach is proposed that uses a bearing capacity correction formula for a footing with a setback from the crest of the slope. Results of a comparative study show that the experimental values for bearing capacity factor N γ(test) , with full corrections for load inclination, load eccentricity, and footing setback are comparable to the theoretical solutions. Furthermore, fully corrected values for N γ(test) for the fixed footing approximately follow the line of the upper boundary; those for the free-rotating footing follow the lower boundary of the theoretical solutions reported in the literature. This discrepancy is due to the different failure mechanisms induced by the restraining conditions of the footing which have yet to be considered in engineering practice.

原文English
頁(從 - 到)1-12
頁數12
期刊Soils and Foundations
59
發行號1
DOIs
出版狀態Published - 2019 二月

指紋

footing
Bearing capacity
bearing capacity
eccentricity
effect
loading test
slope angle
failure mechanism
comparative study
engineering

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

引用此文

@article{ffc7e43db1ce42dbac13659495b5b126,
title = "Effects of restraining conditions on the bearing capacity of footings near slopes",
abstract = "In evaluating the ultimate bearing capacity (q u ) of a strip footing adjacent to a slope, conventional correction formulas for the effect of load eccentricity may not be applicable because these formulas were developed exclusively for footings situated on horizontal grounds, where loads eccentric to opposite sides of the footing yield identical results for q u . In this study, loading tests and analyses are conducted on a strip footing placed adjacent to a model slope with various slope angles. The experimental evidence shows that a load eccentric toward the heel of a footing leads to an increase in bearing capacity, whereas the analytical results based on conventional formulas show the opposite trend. To address this discrepancy, an approach is proposed that uses a bearing capacity correction formula for a footing with a setback from the crest of the slope. Results of a comparative study show that the experimental values for bearing capacity factor N γ(test) , with full corrections for load inclination, load eccentricity, and footing setback are comparable to the theoretical solutions. Furthermore, fully corrected values for N γ(test) for the fixed footing approximately follow the line of the upper boundary; those for the free-rotating footing follow the lower boundary of the theoretical solutions reported in the literature. This discrepancy is due to the different failure mechanisms induced by the restraining conditions of the footing which have yet to be considered in engineering practice.",
author = "Huang, {Ching Chuan}",
year = "2019",
month = "2",
doi = "10.1016/j.sandf.2018.08.016",
language = "English",
volume = "59",
pages = "1--12",
journal = "Soils and Foundations",
issn = "0038-0806",
publisher = "Japanese Geotechnical Society",
number = "1",

}

TY - JOUR

T1 - Effects of restraining conditions on the bearing capacity of footings near slopes

AU - Huang, Ching Chuan

PY - 2019/2

Y1 - 2019/2

N2 - In evaluating the ultimate bearing capacity (q u ) of a strip footing adjacent to a slope, conventional correction formulas for the effect of load eccentricity may not be applicable because these formulas were developed exclusively for footings situated on horizontal grounds, where loads eccentric to opposite sides of the footing yield identical results for q u . In this study, loading tests and analyses are conducted on a strip footing placed adjacent to a model slope with various slope angles. The experimental evidence shows that a load eccentric toward the heel of a footing leads to an increase in bearing capacity, whereas the analytical results based on conventional formulas show the opposite trend. To address this discrepancy, an approach is proposed that uses a bearing capacity correction formula for a footing with a setback from the crest of the slope. Results of a comparative study show that the experimental values for bearing capacity factor N γ(test) , with full corrections for load inclination, load eccentricity, and footing setback are comparable to the theoretical solutions. Furthermore, fully corrected values for N γ(test) for the fixed footing approximately follow the line of the upper boundary; those for the free-rotating footing follow the lower boundary of the theoretical solutions reported in the literature. This discrepancy is due to the different failure mechanisms induced by the restraining conditions of the footing which have yet to be considered in engineering practice.

AB - In evaluating the ultimate bearing capacity (q u ) of a strip footing adjacent to a slope, conventional correction formulas for the effect of load eccentricity may not be applicable because these formulas were developed exclusively for footings situated on horizontal grounds, where loads eccentric to opposite sides of the footing yield identical results for q u . In this study, loading tests and analyses are conducted on a strip footing placed adjacent to a model slope with various slope angles. The experimental evidence shows that a load eccentric toward the heel of a footing leads to an increase in bearing capacity, whereas the analytical results based on conventional formulas show the opposite trend. To address this discrepancy, an approach is proposed that uses a bearing capacity correction formula for a footing with a setback from the crest of the slope. Results of a comparative study show that the experimental values for bearing capacity factor N γ(test) , with full corrections for load inclination, load eccentricity, and footing setback are comparable to the theoretical solutions. Furthermore, fully corrected values for N γ(test) for the fixed footing approximately follow the line of the upper boundary; those for the free-rotating footing follow the lower boundary of the theoretical solutions reported in the literature. This discrepancy is due to the different failure mechanisms induced by the restraining conditions of the footing which have yet to be considered in engineering practice.

UR - http://www.scopus.com/inward/record.url?scp=85057367150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057367150&partnerID=8YFLogxK

U2 - 10.1016/j.sandf.2018.08.016

DO - 10.1016/j.sandf.2018.08.016

M3 - Article

AN - SCOPUS:85057367150

VL - 59

SP - 1

EP - 12

JO - Soils and Foundations

JF - Soils and Foundations

SN - 0038-0806

IS - 1

ER -