Određivanje početnih naprezanja u tlu

master's thesis

• Title (english): Determination of initial stresses in soil
• Author: Barbara Filipović
• Mentor: Meho-Saša Kovačević (mentor)
• Committee member: Danijela Jurić Kaćunić (predsjednik povjerenstva)
• Committee member: Meho-Saša Kovačević (član povjerenstva)
• Committee member: Lovorka Librić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; Zagreb
• Defense date and country: 2021-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering; Geotechnology

Abstract

Cilj ovog rada bio je odrediti naprezanja u tlu kroz 5 različitih primjera u geotehnici. Stavljen je naglasak na efektivna naprezanja, koja se prenose isključivo skeletom tla. U primjeru slojevitog uzorka tla s vanjskim nanesenim opterećenjem, vrijednosti efektivnog naprezanja se povećavaju s dubinom. Iskop u tlu nepovoljno utječe na tlo, dobivene smanjene vrijednosti efektivnog naprezanja ukazuju na oslabljenje tla. Postavljanjem temelja u iskop, povećavaju se ukupna, ali i efektivna naprezanja. Arteški pritisak nepovoljno utječe na tlo, tako da povećava vrijednosti pornog pritiska, a smanjuje vrijednosti efektivnih naprezanja. Pojava vode u tlu je najčešće nepoželjna situacija za radove u građevini, te njezino kretanje bitno utječe. Kretanje vode prema dolje ima pozitivan utjecaj na povećane vrijednosti efektivnog naprezanja, dok obratna situacija nije povoljnog karaktera, jer se čestice ''guraju'' u suprotnom smjeru od gravitacije i tako gube na jačini kontakta. Crpljenjem podzemne vode iz tla u arteškim uvjetima postiže se ravnoteža – smanjenjem dodatnih pornih pritisaka i automatski povećanjem efektivnih naprezanja.

Abstract (english)

The objective of this paper was to determine the stresses in the soil through 5 different examples in geotechnics. Accent is placed on effective stresses, which are transmitted exclusively by the soil skeleton. In the example of a layered soil with an applied load at surface level, the values of the effective stress increase with depth. Excavation in the soil unfavorable affects the soil. The obtained reduced values of effective stress indicate the weakening of the soil. By placing strip footing in the excavation, the total, but also the effective stresses increase. Artesian pressure unfavorable affects the soil, in a way that increases the values of pore pressure, while decreasing the values of effective stresses. The appearance of water in the soil is most often an undesirable situation for construction work and its movement is significantly affected. The downward movement of water has a positive effect on the increased values of the effective stress, while the reverse situation is not favorable, because the particles "push" in the opposite direction from gravity and thus lose the strength of the contact. By pumping groundwater from the soil in artesian conditions, a balance is achieved - by reducing additional pore pressures and automatically increasing the effective stresses.

• Keywords: porni tlak; ukupno naprezanje; efektivno naprezanje; tlo; opterećenje; voda
• Keywords (english): pore pressure; total stress; effective stress; soil; load; water
• Language: croatian
• URN:NBN: urn:nbn:hr:237:238367
• Study programme: Title: Civil Engineering; specializations in: Construction Management, Transportation Engineering, Geotechnical Engineering, Hydraulic Engineering, Structural Engineering, Construction Materials, Theory and Modeling of Structures; Course: Construction Management; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka građevinarstva (magistar/magistra inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2021-11-15 09:32:25