Defleksija površine kolnika kao mjera njegovog strukturalnog stanja

master's thesis

• Title (english): Surface deflection as a pavement bearing capacity measure
• Author: Mihovil Tomić
• Mentor: Tatjana Rukavina (mentor)
• Committee member: Maja Ahac (predsjednik povjerenstva)
• Committee member: Saša Ahac (član povjerenstva)
• Committee member: Tatjana Rukavina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Transportation Engineering); Zagreb
• Defense date and country: 2021-11-25, 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 vrste kolnika i čimbenici koji utječu na funkcionalna i strukturalna svojstva kolničkih konstrukcija. Određivanje strukturalnog stanja prometnice provodi se mjerenjem defleksija kolnika koje je moguće provesti korištenjem različitih uređaja. Usprkos postojanju modernijih sustava, trenutno najčešće korištena metoda izmjere defleksija u Europi je uređaj sa padajućim teretom (FWD - Falling Weight Deflectometer). Interpretacija defleksija dobivenih FWD-om najčešće se radi izračunom koji se naziva
povratna analiza, a izvodi se specijaliziranim računalnim programima. Dobivene defleksije također je moguće i ručno analizirati preko indeksa krivulje defleksija a što je prikazano na analizi projekta rekonstrukcije državne ceste DC7, dionica Kneževo – Beli Manastir. Usporedbom povratne analize provedene u izvornom projektu i analize indeksa krivulje defleksija provedene u ovom radu zaključeno je da se rezultati poklapaju, no da za preciznije određivanje parametara stanja kolničke konstrukcije, koje bi nam služilo kao podloga za izradu projekta sanacije, svakako bi bilo bolje provesti proračun unatrag računalnim programom i to uz
precizno određivanje debljine slojeva GPR-om i istražnim jamama. Indeksi krivulje defleksija mogu biti vrlo korisni ukoliko imamo
nepotpune podatke o debljini slojeva, ili kada ne posjedujemo računalni program za povratnu analizu.

Abstract (english)

The diploma thesis aims to assess the structural condition of the pavement using the index of the deflection basin. The first part of the diploma thesis explains the types of pavements and factors that affect pavement structures' functional and structural properties. Determining the structural condition of the road by measuring pavement deflections can be carried out using different devices. Despite more modern systems, the most commonly used method of measuring deflections in Europe is the Falling Weight Deflectometer (FWD). Interpretation of deflections obtained by FWD, is most often done by a calculation called back-calculation analysis and is performed by specialized computer programs. Manually analyses of the
obtained deflections via the index of the deflection basin curve can also be done. Such analyses are done within the diploma work, on the data from the project state road DC7, section Kneževo - Beli Manastir reconstruction. The main conclusion was that the results from backcalculation performed in the original project matched with those from diploma work. For a more accurate determination of the pavement structure parameters that would serve as a basis for the rehabilitation project, special software has to be used, together with precise determination of layer thickness by GPR and trial pits. Deflection curve indices can be very useful if we have incomplete layer thickness data or when we do not have a computer program for feedback analysis.

• 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:237:372115
• 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: 2022-04-11 07:26:11