DEFLEKSIJA POVRŠINE KOLNIKA KAO PARAMETAR OCJENE NOSIVOSTI

master's thesis

• Title (english): SURFACE DEFLECTION AS A PAVEMENT BEARING CAPACITY MEASURE
• Author: Matej Stanić
• Mentor: Tatjana Rukavina (mentor)
• Committee member: Saša Ahac (predsjednik povjerenstva)
• Committee member: Josipa Domitrović (član povjerenstva)
• Committee member: Tatjana Rukavina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Transportation Engineering); Zagreb
• Defense date and country: 2022-11-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering; Transportation

Abstract

Cilj diplomskog rada je ocjena strukturalnog stanja kolnika korištenjem indeksa krivulje defleksija. U prvom dijelu rada objašnjene su metode ispitivanje nosivosti kolničkih konstrukcija i indeksi stanja kolničkih konstrukcija. Određivanje strukturalnog stanja prometnice provodi se mjerenjem defleksija kolnika i to korištenjem različitih uređaja. Usprkos postojanju modernijih sustava, trenutno najčešće korištena metoda izmjere defleksija u Europi je uređaj s padajućim teretom (FWD - Falling Weight Deflectometer). Interpretacija defleksija dobivenih FWD-om u pravilu se radi izračunom koji se zove povratna analiza, a izvodi se specijaliziranim računalnim programima. Dobivene defleksije moguće je i ručno analizirati indeksom krivulje defleksija. To je prikazano na analizi projekta rekonstrukcije državne ceste D57, dionica 002 (od D46 – izlaza iz naselja Nijemci). Uspoređivanjem povratne analize iz izvornog projekta s analizom indeksa krivulje defleksija provedene u ovom radu donesen je zaključak da se rezultati poklapaju i da bi za preciznije određivanje parametara stanja kolničke konstrukcije, koje može služiti kao podloga za izradu projekta sanacije, svakako bilo bolje provesti proračun unatrag računalnim programom uz precizno određivanje debljine slojeva GPR-om i istražnim jamama. Indeksi krivulje defleksija mogu biti korisni kada imamo nepotpune podatke o debljini slojeva ili kada nemamo program za povratnu analizu.

Abstract (english)

The aim of this thesis is to evaluate the structural condition of the pavement using the deflection curve index. In the first part of the paper, the methods of testing the bearing capacity of pavement structures and indexes of the condition of pavement structures are explained. Determining the structural condition of the road is carried out by measuring pavement deflections using different devices. Despite the existence of more modern systems, currently the most commonly used deflection measurement method in Europe is a device with a falling weight (FWD - Falling Weight Deflectometer). The interpretation of the deflections obtained by FWD is usually done by a calculation called back analysis, which is performed by specialized computer programs. The resulting deflections can also be manually analyzed with the deflection curve index. This is shown in the analysis of the reconstruction project of state road D57, section 002 (from D46 – exit from the Nijemci settlement). By comparing the reverse analysis from the original project with the analysis of the index of the deflection curve carried out in this work, it was concluded that the results match and that for a more precise determination of the parameters of the condition of the pavement structure, which can serve as a basis for creating a rehabilitation project, it would certainly be better to carry out a backward calculation by computer program with precise determination of the thickness of layers by GPR and exploration pits. Deflection curve indices can be very useful when we have incomplete data on layer thickness or when we do not have a back-analysis program.

• Keywords: defleksija; strukturalno stanje kolnika; FWD; indeksni pokazatelji
• Keywords (english): deflection; structural condition of pavement; FWD; index indicators
• Language: croatian
• URN:NBN: urn:nbn:hr:237:170183
• 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: 2022-12-19 07:36:55