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.

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.

scholarly journals Bearing Capacity of Interfered Adjacent Strip Footings on Granular Bed Overlying Soft Clay: An Analytical Approach

2021 ◽  
Vol 7 (7) ◽  
pp. 1244-1263
Author(s):  
R. Shivashankar ◽  
S. Anaswara
Keyword(s):  
Bearing Capacity ◽  
Analytical Model ◽  
Carrying Capacity ◽  
Soft Clay ◽  
Punching Shear ◽  
Load Carrying Capacity ◽  
Granular Bed ◽  
Shear Model ◽  
Load Carrying ◽  
Strip Footings

In the present paper, the interference effects on bearing capacity of two and three closely spaced strip footings resting on granular bed overlying clay are being studied. A simple analytical model is proposed to predict the load-carrying capacity and the interference factor of an interfered footing, when adjacent strip footings are optimally placed on the surface of a Granular Bed (GB) overlying clay and both the footings are simultaneously loaded. A punching shear failure mechanism is envisaged in the analytical model. The load-carrying capacity of the footing is taken as the sum of total shearing resistances along the two vertical planes through the edges of the strip footing in the upper granular layer and the load-carrying capacity of the soft clay beneath the GB. Insights gained from finite element simulations are used to develop the new modified punching shear model for interfering footing. Bearing capacity can be easily calculated by using the proposed punching shear model for interfering footing. The analytical model is validated with numerical analyses and previous experimental results and found to be in reasonably good agreement. The influence of different parameters such as granular bed thickness, width of footing, number of footings are carried out in this study. Doi: 10.28991/cej-2021-03091723 Full Text: PDF

Vertical bearing capacity factors for circular and strip footings on Mohr–Coulomb soil

1993 ◽  
Vol 30 (6) ◽  
pp. 1024-1033 ◽  
Author(s):  
M.D. Bolton ◽  
C.K. Lau
Keyword(s):  
Bearing Capacity ◽  
Plane Strain ◽  
Method Of Characteristics ◽  
Soil Parameters ◽  
Shape Factors ◽  
Method Of Solution ◽  
Vertical Bearing ◽  
Strip Footings ◽  
Vertical Bearing Capacity ◽  
The Relationship

The method of characteristics is used to establish consistent factors for the vertical bearing capacity of circular and strip footings on soil which satisfies a linear [Formula: see text] Mohr–Coulomb strength criterion. This method of solution avoids the assumption of arbitrary slip surfaces, and produces zones within which equilibrium and plastic yield are simultaneously satisfied for given boundary stresses. Although similar solutions have previously been published for circular footings, their application has been hindered by errors and confusions over terminology. These are resolved, and the method of solution is explained. It is confirmed that Terzaghi's approach to the superposition of bearing terms containing Nq, Nγ, and Nc is both safe and sufficiently accurate for circular footings, as for strip footings. The values to be adopted are tabulated as functions of [Formula: see text]. Differences between the factors applicable to circular and strip footings far exceed the allowances of the empirical shape factors in common use. Some new shape factors are suggested that better represent the relationship between the limiting equilibrium of circular and strip foundations. Some current shape factors attempt to allow simultaneously for the differences in equilibrium solutions and the differences in axisymmetric (triaxial) and plane strain soil parameters. This cannot succeed, since the relationship between strength parameters depends strongly on relative density. The new bearing factors facilitate a more rational approach in which soil parameters appropriate to the geometry can first be determined and then used to find appropriate bearing capacity factors. Key words : bearing capacity, axisymmetry, method of characteristics, footings, plane strain.

Experimental study on bearing capacity of shell strip footings near geotextile-reinforced earth slopes

2021 ◽  
Vol 28 (8) ◽  
pp. 2527-2543
Author(s):  
Seyed Ali Ghaffari ◽  
Elham Sattari ◽  
Amir Hamidi ◽  
Gholamhosein Tavakoli Mehrjardi ◽  
Abtin Farshi Homayoun Rooz
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Reinforced Earth ◽  
Earth Slopes ◽  
Strip Footings

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.

Study on vertical motion reduction of a trimaran based on collaborative controlled appendages

2020 ◽  
Vol 17 (6) ◽  
pp. 172988142097677
Author(s):  
Zhilin Liu ◽  
Linhe Zheng ◽  
Guosheng Li ◽  
Shouzheng Yuan ◽  
Songbai Yang
Keyword(s):  
Experimental Study ◽  
Vertical Motion ◽  
Model Tests ◽  
Wave Period ◽  
Regular Waves ◽  
Towing Tank ◽  
Vertical Stability ◽  
Stabilization Control ◽  
Stability Performance

In recent years, the trimaran as a novel ship has been greatly developed. The subsequent large vertical motion needs to be studied and resolved. In this article, an experimental study for a trimaran vertical stabilization control is carried out. Three modes including the bare trimaran (the trimaran without appendages, the trimaran with fixed appendages, and the trimaran with controlled appendages) are performed through model tests in a towing tank. The model tests are performed in regular waves. The range of wave period is 2.0–4.0 s, and the speed of the carriage is 2.93 and 6.51 m/s. The results of the three modes show the fixed appendages and the actively controlled appendages are all effective for the vertical motion reduction of the trimaran. Moreover, the controlled appendages are more effective for the vertical stability performance of the trimaran.

scholarly journals Experimental Study on Residual Bearing Capacity of Existing Prestressed Concrete Hollow Slab Beam

2021 ◽  
Vol 632 ◽  
pp. 022063
Author(s):  
Baoqun Wang ◽  
Dejin Xing ◽  
Chengyong Chen ◽  
Zhongnan Tian ◽  
Gangnian Xu
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Prestressed Concrete
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