Bearing Capacity of Strip Footings in Frozen Soils

1975 ◽  
Vol 12 (3) ◽  
pp. 393-407 ◽  
Author(s):  
B. Ladanyi
Keyword(s):  
Mathematical Model ◽  
Bearing Capacity ◽  
Frozen Soil ◽  
Simple Mathematical Model ◽  
Frozen Soils ◽  
Present Solution ◽  
Strip Footings ◽  
Allowable Bearing Pressure ◽  
Circular Footing

The first part of this paper discusses some basic requirements for the determination of the allowable bearing pressure for frozen soils, with a particular reference to the delayed deformations due to creep and consolidation, which occur simultaneously in frozen soils containing large amounts of unfrozen water.In the second part of the paper, it is shown how the creep settlement and failure of a strip footing in frozen soil can be predicted by using a simple mathematical model of an expanding cylindrical cavity. With the help of a previously obtained solution, valid for a circular footing, and an appropriate empirical depth factor, the present solution is then extended to cover also the bearing capacity of footings of any shape and at any depth of embedment.

Determination of long-term strength of frozen soils and bearing capacity of piles by means of cone penetration test.

2020 ◽  
pp. 54-64
Author(s):  
I.B. Ryzhkov ◽  
◽  
M.A. Minkin ◽  
O.N. Isaev ◽  
◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Cone Penetration Test ◽  
Term Strength ◽  
Penetration Test ◽  
Cone Penetration ◽  
Frozen Soils

Static-penetration determination of the bearing capacity of piles in plastic-frozen soils

1987 ◽  
Vol 24 (5) ◽  
pp. 194-198
Author(s):  
O. N. Isaev ◽  
F. E. Volkov ◽  
M. A. Minkin
Keyword(s):  
Bearing Capacity ◽  
Frozen Soils ◽  
Static Penetration

scholarly journals The Determination of the Velocities after Impact for the Constrained Bar Problem

2009 ◽  
Vol 2009 ◽  
pp. 1-16
Author(s):  
André Fenili ◽  
Luiz Carlos Gadelha de Souza ◽  
Bernd Schäfer
Keyword(s):  
Mathematical Model ◽  
Numerical Integration ◽  
Equations Of Motion ◽  
Robotic Manipulators ◽  
Robotic Manipulator ◽  
Simple Mathematical Model ◽  
Governing Equations ◽  
Complex Problems ◽  
Constrained Equation

A simple mathematical model for a constrained robotic manipulator is investigated. Besides the fact that this model is relatively simple, all the features present in more complex problems are similar to the ones analyzed here. The fully plastic impact is considered in this paper. Expressions for the velocities of the colliding bodies after impact are developed. These expressions are important in the numerical integration of the governing equations of motion when one must exchange the set of unconstrained equations for the set of constrained equation. The theory presented in this work can be applied to problems in which robots have to follow some prescribed patterns or trajectories when in contact with the environment. It can also de applied to problems in which robotic manipulators must handle payloads.

Infinite-dilution activity coefficients by comparative ebulliometry: A model of ebulliometer and the experimental equipment and procedure

1986 ◽  
Vol 51 (7) ◽  
pp. 1393-1402 ◽  
Author(s):  
Vladimír Dohnal ◽  
Marcela Novotná
Keyword(s):  
Mathematical Model ◽  
Activity Coefficients ◽  
Infinite Dilution ◽  
Calibration Error ◽  
Simple Mathematical Model ◽  
Experimental Equipment ◽  
Infinite Dilution Activity Coefficients ◽  
The Difference ◽  
Major Factors

The ebulliometric technique for determination of infinite-dilution activity coefficients is examined. A simple mathematical model of ebulliometer is formulated to derive and analyze corrections accounting for the difference between the composition of the ebulliometer charge and that of the equilibrium liquid. Our own experimental equipment employing the comparative ebulliometric setup is described along with the measuring procedure and calibration. Error analysis is carried out identifying major factors limiting the accuracy of the determination.

Behavior of Circular Footings and Plate Anchors Embedded in Permafrost

1974 ◽  
Vol 11 (4) ◽  
pp. 531-553 ◽  
Author(s):  
B. Ladanyi ◽  
G. H. Johnston
Keyword(s):  
Mathematical Model ◽  
Bearing Capacity ◽  
Soil Mechanics ◽  
Normal Pressure ◽  
Strength Properties ◽  
Frozen Soil ◽  
Time Dependent ◽  
Nonlinear Viscoelastic ◽  
Permafrost Soils ◽  
Failure Loads

The purpose of this paper is to develop a method for predicting the creep settlement and the bearing capacity of frozen soils under deep circular loads. The theory uses experimentally determined creep parameters of frozen soil and is intended to be applicable to the design of deep circular footings and screw anchors embedded in permafrost soils. On the basis of available experimental evidence, it was concluded that a mathematical model different from that usual in soil mechanics should be used in solving the time-dependent bearing capacity problem of such footings. The solution proposed in the paper was obtained by using the mathematical model of an expanding spherical cavity in a nonlinear viscoelastic-plastic medium with time, temperature, and normal pressure dependent strength properties. For a given footing or anchor, the theory furnishes either isochronous load-displacement curves, or load-creep rate curves, or a time-dependent bearing capacity for which formulas and graphs of nonlinear elastic-plastic bearing capacity factors are supplied.The theoretical predictability of creep rates and ultimate failure loads was checked against the results of screw anchor tests carried out by the Division of Building Research, N.R.C.C., at a permafrost site in Thompson, Manitoba. It was found that the use in the theory of the creep parameters determined by creep-pressuremeter tests performed at the site, resulted in a satisfactory agreement between the predicted and the observed behavior.

Determination of creep properties of frozen soils by means of the borehole stress relaxation test

1993 ◽  
Vol 30 (1) ◽  
pp. 170-186 ◽  
Author(s):  
B. Ladanyi ◽  
M. Melouki
Keyword(s):  
Stress Relaxation ◽  
Strength Properties ◽  
Frozen Soil ◽  
Relaxation Test ◽  
Test Results ◽  
Stress Relaxation Test ◽  
Frozen Soils ◽  
Frozen Sand

The objective of this investigation was to evaluate the potential use of the borehole stress relaxation test to determine the creep and strength properties of frozen soils in situ. The paper presents the results of a series of laboratory pressuremeter relaxation tests performed in frozen sand and compares three possible interpretation methods for deducing from the test results the creep and strength parameters of frozen soils. Key words : borehole relaxation, pressuremeter, in situ testing, creep and strength properties, frozen soil.

Determination of Bearing Capacity of Cleared and Graded Areas at Airports

2021 ◽  
Vol 147 (1) ◽  
pp. 04020086
Author(s):  
Vittorio Ranieri ◽  
Nicola Berloco ◽  
Donato D’Auria ◽  
Vincenzo Disalvo ◽  
Veronica Fedele ◽  
...  
Keyword(s):  
Bearing Capacity

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

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