Abstract
This summary of the author’s PhD thesis supervised by Prof Dr Alfredas Laurinavičius and defended on 7 December 2007 at the Vilnius Gediminas Technical University. The thesis is written in Lithuanian and is available from the author upon request. In chapter 1 describes the existing problem, the need for the use of geotextiles for the separation of road and street structures. Also, the relevance of the research, the scientific novelty and originality of the dissertation, its aim and practical importance. Chapter 2 presents analysis of the geotextile selection methods for the separation of structural layers. In chapter 3 presented experimental research of the use of geotextiles for the separation of roads and streets pavement structure layers. Finally in chapter 4 the geotextile selection method for the use in the Lithuanian roads and streets pavement structures is presented. Developed geotextile selection method reflects the need for the use of geotextile, takes into consideration the factors having the impact on the occurrence of geotextile damages during pavement installation and in the course of road operation.
Highlights
This summary of the author’s PhD thesis supervised by Prof Dr Alfredas Laurinavičius and defended on 7 December 2007 at the Vilnius Gediminas Technical University
Developed geotextile selection method reflects the need for the use of geotextile, takes into consideration the factors having the impact on the occurrence of geotextile damages during pavement installation and in the course of road operation
For the research purposes a gravel road of local importance was selected under continuous heavy loading. This part of the experimental research was further divided into two parts: one of them – aimed at the assessment of tendencies in the occurrence of geotextile damages and fulfilment of the separation function, depending on the materials used for the construction of the subbase, when the road structure has asphalt concrete pavement, the other – has no asphalt concrete pavement
Summary
The structural strength of roads and streets as well as the uniformity of strength are ensured by a design strength of subgrade, subbase and pavement layers, characterized by a deformation modulus, the value of which depends on the properties of materials used for the pavement structural layers and thickness of the layers. It is necessary to undertake another experimental research to identify and assess the dependency of geotextile damages and fulfilment of the separation function on the vehicle loads during road operation, the materials used for the installation of pavement structure and on the thickness of pavement structure over the geotextile. For the research purposes a gravel road of local importance was selected under continuous heavy loading (about 150 vpd/day) This part of the experimental research was further divided into two parts: one of them – aimed at the assessment of tendencies in the occurrence of geotextile damages and fulfilment of the separation function, depending on the materials used for the construction of the subbase, when the road structure has asphalt concrete pavement, the other – has no asphalt concrete pavement. The levels of factors and ranges of their variation, where the main level and range of variation for the type of subbase material isn’t determined, are presented in Table 1, functional dependency of geotextile damages
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