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Applicationofdeformationanalysisonthegeodetic.doc
Application of deformation analysis on the geodetic measurements
Iva ALI?I?, Loris REDOVNIKOVI?, Mira IVKOVI?, Croatia
Key words: deformation analysis, tunnel, software package Panda
SUMMARY
The development of modern software and computing technology allows a range of benefits for data acquisition and processing. Today we can therefore handle a large amount of statistical data obtained through extensive measurements, and make right decisions based on the results of those tests. This is especially important for deformation analysis, because it is often very small movements, not easily visible through data analysis, that make a difference. This paper will present the results of deformation analysis of network points in the southern part of the tunnel St. Ilija. Measurements were carried out in several epochs. Deformation analysis was performed using the software package Panda, and an independent review of the results was made.
INTRODUCTION
Tunnel St. Ilija is located in Croatia, on the connecting road Zagvozd-Ba?ka Voda and passes through the mountain range Biokovo. It consists of main and service pipes whose axes are spaced 25 m. Due to the inaccessible terrain, the tunnel represented a real challenge for all who worked on its breakthrough. Overburden height of over 1300 m ranks it among the largest road tunnels in limestone overburden in the world. Considering this is a fairly long tunnel - over 4000 m, surveying professionals have been set with very high demands related to measurement accuracy associated with breakthrough. For the purpose of drilling the tunnel, surveying micro-networks were established in front of the northern and southern portals. That micro-networks represent the geodetic basis from which the projected geometric elements were transfered in the natural environment of the tunnel when breakthrough was completed. Underground geodetic basis on the northern side of the tunnel was consisted of pillars, which were stabilized at the edge of the tunnel,
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