SVIBOR - Project code: 2-11-356


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


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Project code: 2-11-356


Main researcher: VERIĆ, FRANJO (74774)

Type of research: developmental
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 16
Institution name: Građevinski fakultet, Zagreb (82)
Department/Institute: Geotechnical Department
Address: Fra Andrije Kačića Miošića 26, 41000 Zagreb
City: 10000 - Zagreb, Croatia
Phone: 385 (0)41-442-600, 451-185
Fax: 385 (0)41-416-621

Summary: The project " Structure Foundations with Aimed Re-distributionof Contact Stresses" comprises a wide range of issues where "thenatural" transmission of forces and/or stresses in the soil andthe structure is being deliberately changed by certain technicalmeasures. In the project covering geotechnical anchors the dependance ofthe anchor root displacement ( extreme point ) and the activatedforce has been considered. For the linear and bilinearrelationship of displacement and shear stress on the anchorcylinder - adjacent soil contact the analytical solutions havebeen developed while the numerical procedure has been developedfor the general relationship. The aimed water flow through the embankment dams represents alsocertain aiming of the force transmission in the structure. Withthe selection of the drainage system a stream and potential fied,respectively, is formed affecting the static and hydraulicstability of the structure. The aimed stress re-distribution is particularly expressed in thebeam and slab foundation structures. Here, by weakening the soilin the particular zones the stresses in the structure as well asthe structure deformation can be essentially affected. At piles the negative friction represents a separate problem andit can be entirely or partly eliminated by particular technicalmeasures. The complex systems offer the greatest possibilities of the aimedforce transmission through the structure to the soil ( e.g.crane rails on the longitudinal sleeper with elastic washers ).

Keywords: Contact stress, aimed re-distribution, foundation structure, anchors, piles, embankment dams, seepage

Research goals: The main scope of these investigations is to find out such technical measures applied to the structure and/or the soil that could change "the natural" transmission of the forces from the structure to the soil. By changing the force transmission also the stress, strain and displacement conditions of the entire structure system , structure-foundation-soil, is being changed. This change is being introduced as to attain one of the following objects: - to get a technically more efficient solution - to get an economical solution - to provide a safer solution - to avoid some technical problems. Such measures can result in a more uniform strain of the structure with the identical or similiar settlements of all foundations or in equalization of the foundation beam or grillage settlements. Moreover, the aimed force transmission to the soil can prevent a just constructed structure to cause stresses under the existing structure due to which an additional settlement, bending and cracking of the structure would take place. Consequently, "the natural" force transmission from the structure to the soil need not always be favourable either for the new structure or for the existing structures. A deliberate change of force transmission to the soil can provide more suitable technical and economical solutions or thus certain technical problems can be avoided.

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Last update: 02/23/94