New methods for modern technology for the evaluation of spatial parameters of underground structures

The process of acquiring geometric data within geosciences is usually limited by predetermined observation points, anthropogenous or naturally exposed visible objects. With the classical geodetic methods for measuring the underground construction’s location of observed points are being determined systematically or on spots where manifestations of natural or anthropogenic influences are expected according to professional interpretations. Activities in rocks cannot be entirely predicted. At the same time the problem is often in insufficient accuracy and inadequate plans after implemented activities or excavations, which are often a reference or in null condition for further management with the construction. The solution for comprehensive three-dimensional measurement with high metric accuracy is 3D terrestrial laser scanning technology. The direct result of such data capture is condensed to be a crowd of spatially located points – a point cloud, which describes the accurate shape of the complex engineering object building with some primary data processing. The raster of scanning is definable and adjusted to the demands and can reach also millimetre spans. Monitoring and the analysis of deformations detected on visible watched surfaces is one of the applications of the mentioned technologies. Besides the deformation analyses, a method for 3D registering of the fractures was developed and consequently predicted of optimal excavation progress. The application is introduced with one epoch in the case of underground excavation of Doline with the capture of Fracture Targets (FT) and the simulation of the progress of excavation.