Upper bound to bearing capacity of layered soils

1989 ◽  
Vol 26 (4) ◽  
pp. 730-736 ◽  
Author(s):  
Antoni Florkiewicz
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Limit State ◽  
Layered Soils ◽  
Flat Punch ◽  
Layer System ◽  
Capacity Limit ◽  
Strip Footings ◽  
Kinematical Approach ◽  
Layered Half Space

An approach to the problem of flat punch indentation into the Mohr-Coulomb layered half-space has been developed, based on the kinematical approach of limit analysis. A kinematically admissible plane-strain failure mechanism for a typical two-layer system is presented. The ultimate bearing capacity for strip footings obtained from the proposed approach compares well with the experimental data available in the literature. Key words: bearing capacity, limit state analysis, layered soil, strip footings.

Experimental study of punching coefficients and shape factor for two-layered soils

1979 ◽  
Vol 16 (4) ◽  
pp. 802-805 ◽  
Author(s):  
A. J. Valsangkar ◽  
G. G. Meyerhof
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Shape Factor ◽  
Model Tests ◽  
Punching Shear ◽  
Deep Foundations ◽  
Layered Soils ◽  
Shape Factors ◽  
Capacity Theory ◽  
Strip Footings

The ultimate bearing capacity of deep foundations has been investigated for the case of a strong layer overlying a weak stratum. The studies are based on model tests using buried circular and strip footings for a range of layer thicknesses. Based on the previously developed bearing capacity theory, the punching shear coefficients and corresponding shape factors have been evaluated.

Ultimate bearing capacity of foundations on layered soils under inclined load

1978 ◽  
Vol 15 (4) ◽  
pp. 565-572 ◽  
Author(s):  
G. G. Meyerhof ◽  
A. M. Hanna
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Model Tests ◽  
Clay Soils ◽  
Layered Soils ◽  
Inclined Load ◽  
Soft Layer ◽  
Soil Failure ◽  
Strip Footings

The ultimate bearing capacity of footings resting on subsoils consisting of two layers has been investigated for the cases of a dense or stiff layer overlying a weak deposit, and a loose or soft layer overlying a firm deposit. The analyses of different modes of soil failure are compared with the results of model tests on circular and strip footings on layered sand and clay soils.

Influence of groundwater on the bearing capacity of shallow foundations

2005 ◽  
Vol 42 (2) ◽  
pp. 663-672 ◽  
Author(s):  
Ernesto Ausilio ◽  
Enrico Conte
Keyword(s):  
Bearing Capacity ◽  
Water Table ◽  
Limit Analysis ◽  
Parametric Study ◽  
Shallow Foundations ◽  
Simple Approximation ◽  
Capacity Limit ◽  
Strip Footings ◽  
Analytical Expressions ◽  
Kinematic Approach

In this paper, the kinematic approach of limit analysis is used to analyse the influence of groundwater on the bearing capacity of shallow foundations. Analytical expressions are derived allowing the bearing capacity of strip footings resting on a soil where the water table is at some depth below the footing base to be calculated. Results from these expressions are compared with those obtained using other theoretical solutions available in literature. Moreover, a parametric study is carried out to illustrate the effects on bearing capacity of submergence of the soil below the footing. The importance of these effects is discussed, and remarks are also made on the results provided by some simplified methods that are currently used in practice. Finally, a simple approximation of the theoretical solution derived in this study is suggested for practical purposes.Key words: bearing capacity, limit analysis, groundwater, strip footings.

scholarly journals Ultimate seismic bearing capacities and failure mechanisms for strip footings placed adjacent to slopes

2019 ◽  
Vol 56 (11) ◽  
pp. 1729-1735 ◽  
Author(s):  
Haizuo Zhou ◽  
Gang Zheng ◽  
Xinyu Yang ◽  
Tao Li ◽  
Pengbo Yang
Keyword(s):  
Soil Properties ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Limit State ◽  
Seismic Loading ◽  
Relative Increase ◽  
Superposition Method ◽  
Seismic Bearing Capacity ◽  
Strip Footings ◽  
Underlying Soil

Assessment of the ultimate bearing capacity of foundations adjacent to slopes is complex as it is highly dependent on the slope geometry and soil properties. Seismic loading may impact both the critical failure mechanism and its associated bearing capacity. The existing approaches for analyzing the seismic bearing capacity of footings near slopes typically employ coefficients developed to fit the conventions of Terzaghi’s bearing capacity equation, herein referred to as the “superposition method.” In this study, a rigorous assessment of the seismic bearing capacity is performed using an upper-bound limit state plasticity framework known as discontinuity layout optimization (DLO), which makes few prior assumptions concerning the failure geometry. Results show that soil properties, slope configuration, and pseudostatic seismic loading all influence the realized failure mechanism and associated bearing capacity. The use of bearing capacity coefficients that fit within the conventional superposition method may underestimate limit loads when the underlying soil provides a relative increase in resistance, but may greatly overestimate bearing capacity when the self-weight of the soil is destabilizing in nature. A set of design charts using direct computational methods for a variety of geometric, geotechnical, and seismic conditions is provided.

scholarly journals Conparison Effect of the Method of Calculation of Foundation on the First Limit State

2017 ◽  
Vol 5 (1) ◽  
pp. 25-30
Author(s):  
Максим Матвиенко ◽  
Maksim Matvienko ◽  
Владимир Дыба ◽  
Vladimir Dyba ◽  
Валентина Ильинова ◽  
...  
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Standard Method ◽  
Limit State ◽  
New Method ◽  
Method Of Calculation

In this article discusses the problem discrepancy normative methods for calculating the bearing capacity of foundations experimental data and the new method, taking into account the joint interaction of the foundation and the base. The calculated cost of the foundation de-signed according to a standard method and the new method. Examined the economic feasibil-ity of the use of foundations designed by a new method

Evaluation of the Bearing Capacity of the Concrete Pier Exposed to the Freeze-Thaw Cycles

2012 ◽  
Vol 166-169 ◽  
pp. 1216-1221
Author(s):  
Zi Yu Li
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Cross Section ◽  
Design Method ◽  
Limit State ◽  
Factors Affecting ◽  
Freeze Resistance ◽  
Freeze Thaw ◽  
Maximal Stress ◽  
Effective Depth

This paper has studied the evaluation of bearing capacity of concrete piers exposed to the freeze-thaw cycles. In this paper, based on the mechanism of freeze-thaw process, several factors affecting the freeze resistance of concrete were considered, and a regression model including the interaction of loads and freeze-thaw was established according to experimental data. Besides, a wholly new concept - the effective depth of the freeze-thaw has been introduced into the analyzing, and it also considers of the area of cross section reducing, which results in the stress concentration. It calculates the maximal stress by using the limit state design method, and finally judges its rank of damage.

Bearing Capacity of Strip Footings in Two Layered Cohesive-friction Soils

1974 ◽  
Vol 11 (1) ◽  
pp. 32-45 ◽  
Author(s):  
P. Purushothamaraj ◽  
B. K. Ramiah ◽  
K. N. Venkatakrishna Rao
Keyword(s):  
Bearing Capacity ◽  
Failure Mechanism ◽  
Friction Angle ◽  
Unit Weight ◽  
Layered Soils ◽  
Strip Footings

A method has been formulated for bearing capacity of footings on two layered soils with varying cohesion, friction, and unit weight based on the second theorem of Drucker and Prager (kinematical consideration). The failure mechanism considered was fundamentally similar to that of Prandtl–Terzaghi but with different wedge angles. The critical wedge angles were found in each case. Bearing capacity charts for footings are presented by varying cohesion in layers, with the same friction angle and unit weight. The charts are readily usable for any combination of c2/c1, d/b, φ, and γ.

EXPERIMENTAL VERIFICATION OF NEW METHODOLOGY FOR CALCULATING OF THE FLEXIBLE FERROCONCRETE FOUNDATION OF THE FIRST LIMIT STATE

2016 ◽  
Vol 4 (4) ◽  
pp. 0-0
Author(s):  
Владимир Дыба ◽  
Vladimir Dyba ◽  
Максим Матвиенко
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Experimental Verification ◽  
Limit State ◽  
Strength Characteristics ◽  
New Method ◽  
Sandy Ground

The article discusses the problem of discrepancy of normative methods for calculating the bearing capacity of foundations experimental data. The authors proposed a new method of calculation of flexible ferroconcrete foundation, which can eliminate a large gap between the calculated and experimental data. The article describes an experiment on a sandy base, and its results, confirming the new methodology. The use of bilinear limit line τ (σ) for the calculation of the strength characteristics of dense sandy ground is describes.

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

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