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Ultimate Bearing Capacity of Strip Footing on Sand Underlain By Clay Under Inclined Load

Dutta Rakesh Kumar, Khatri Vishwas Nandkishor, Kaundal Nitesh

Civil and Environmental Engineering Reports

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2022

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Vol. 32, no. 1

116--137

EN

This paper presents the bearing capacity determination of strip footing placed on sand underlain by clay and subjected to inclined loading. The bearing capacity equation is derived within the framework of limit equilibrium by following the projected area approach. The inclinations of load spread were selected by performing an additional finite element analysis. A parametric study was conducted to highlight the effect of various input parameters such as i) the thickness of the top sand layer, ii) embedment depth of footing, iii) the friction angle of sand and cohesion of clay, and iv) inclination of the applied load. The obtained results for a vertically loaded footing are slightly underestimated with that available in the literature. The computed bearing capacity values for a foundation with inclined loading compare favorably for lower inclination angle but slightly overestimates for higher load inclination angle, concerning that obtained using the available formula in the literature.

2

Stability estimation of slopes having their slip surface determined by means of the STAB-3D method based on sliding body equilibrium analysis

Ukleja J.

Geological Quarterly

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2016

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Vol. 60, No. 3

597--609

EN

Most of the three-dimensional analyses of landslides are based on simple 2D methods analysing chosen characteristic flat sections of the analysed sliding body. Assumptions of the method of flat limit equilibrium analysis for a spatial solution have been elaborated. This is a combination of 2D analysis of flat sectional views and 3D analysis of the landslide’s sliding body, which disregards any stress that does not affect equilibrium. It is assumed, however, to apply only when dealing with structural slope failure (i.e. when the soil layers have the predisposition to shape the determined slip surface with a consistent decrease and explicit slide direction). This can also apply when examining the stability of a scarp or slope for the layered soil of potential slip surfaces and slide direction to be defined. The basic assumptions, equilibrium equations, and practical usage of the method have been described for an exemplary landslide. This method allows one to define in a straightforward manner the stability of slopes, to plan a way of preventing potential landslides, and to control those that have already arisen.

3

Influence of instalation of piles with partial and full displacement of the soil on the soil on the subsoil strength

Gwizdała K., Pająk M.

Architecture Civil Engineering Environment

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2008

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Vol. 1, no. 2

43-50

EN

Many advantages of displacement piles result in their very common use of present. In case of displacement pile, of particular importance are the phenomena occurring in direct vicinity of the pile shaft, where partial or total pushing the soil out aside is observed. Changes of vertical and horizontal stresses, pore water pressure generation, changes in soil structure, its moisture content and density taking place during installation of displacement piles create almost new soil conditions at the contact of pile shaft and subsoil. The paper presents the results of CPT tests carried out in the subsoil around CFA piles particularly in layered soils (non-cohesive/cohesive ones). Special attention is paid to a selection of proper parameters of drilling machine and concreting technology to form the pile. It is planned to continue the investigations based on theoretical description in the frame of soil mechanics.

PL

Stosowanie wierconych pali przemieszczeniowych jest obecnie bardzo częste. Wiele zalet tych pali będzie predysponowało je do powszechnego stosowania. Szczególne znaczenie mają zjawiska zachodzące w bezpośrednim sąsiedztwie pobocznicy pala gdy mamy do czynienia z częściowym lub całkowitym rozpychaniem gruntu na boki. Zmiany stanu naprężenia pionowego, poziomego, generacja ciśnienia wody w porach gruntu, zmiana struktury gruntu, wilgotności i zagęszczenia stwarza zupełnie nowe warunki oddziaływania w strefie pobocznica pala - zmienne podłoże gruntowe. W artykule przedstawiono wyniki badań sondą statyczną CPT w sąsiedztwie pali CFA, ze szczególnym uwzględnieniem gruntów uwarstwionych: grunty spoiste/grunty niespoiste. Zwrócono uwagę na dobór parametrów maszyny i technologii betonowania w zależności od rodzaju gruntu. Dalsze badania będą zmierzały do wyjaśnienia zmian w podłożu gruntowym w odniesieniu do zasad opisujących zmiany w ujęciu teorii mechaniki gruntów.