Danijela Jurić Kaćunić

Croatian experience in application of UAS for landslide remediation measures

Unmanned Aerial System (UAS), also known as ‘drone’, has found many applications in various sectors of human activity. Drones were shown useful since they can be used for remote investigations in very simple manner. They can be navigated by the operator from the ground or they can conduct an investigation by themselves in programmed flight path. In the Republic of Croatia, drones have recently been effectively used as part of investigative work for the purpose of design and remediation measures in many landslide areas. Northern part of Croatia is characterized by a large number of landslides which can cause serious damage to buildings and transportation infrastructure, personal injury and traffic delays. In order to detect features linked with landslides (boundaries, cracks, etc.) a drone technology is applied and was shown as very effective, with some examples shown in this paper. Not only that overall cost of the investigation is lower, but ‘bigger picture’ of landslide areas is taken in consideration. Also, increase of safety is also significant since engagement of additional personnel is avoided, which was previously inevitable since they needed to examine ‘dangerous to reach’ areas in order to detect features linked with landslides,

Rehabilitation Techniques for Aged Railway Tunnels

Due to fact that most of the railway tunnels in Croatia were constructed around hundred years ago, and taking in consideration lack of investments and maintenance strategies, there is an increasing need for their rehabilitation. However, this need is far greater than the available financial framework and therefore it is necessary to properly define the rehabilitation priority list and to apply the state-of-the-art rehabilitation methods to improve the safety and functionality aspects. This will result in overall lifetime increase of these critical infrastructure objects. In order to deal with such challenging task, this paper presents the techniques and methodologies for all stages of tunnel rehabilitation process, starting from investigation works in order to determine current condition of tunnel, through development of rehabilitation design, implementation of rehabilitation measures and quality control programme. The problems of non-satisfactory free tunnel profile, lining instabilities, excessive drainage of groundwater etc. will be presented through the examples of several railway tunnels in Croatia.

Primjena bespilotnih letjelica na prometnoj infrastrukturnoj mreži

Ucestale nagle klimatske promjene uzrokuju sve vecu pojavu odrona na prometnoj infrastrukturnoj mreži. Primjenom bespilotnih letjelica mogu se dopuniti, poboljsati, pa cak i u potpunosti zamijeniti klasicni nacini kartiranja, određivanja volumena, poprecnih presjeka, slojnica i drugih parametara koji su potrebni za inženjerske analize odrona. U radu se prikazuju mogucnosti koristenja bespilotnih letjelica u ocjeni stanja prometne infrastrukturne mreže, isticuci njihove prednosti i nedostatke. Prikazana je zakonska regulativa i znanstvenoistraživacke inicijative za primjenu bespilotnih letjelica.