1 MONITORING OF DISPLACEMENT OF VIDE RANGE FOCUSED ON HISTORICAL BUILDINGS AND SLOPES Jan Zalesky 1 , Pavla Voborilova 2 , Jan Pruska 1 and Jaromir Prochazka 3 1 Department of Geotechnic, e-mail: zalesky@fsv.cvut.cz, zalesk@volny.cz 2 Department of Geodesy and Land Consolidation, e-mail: pavla.voborilova@fsv.cvut.cz 2 Department of Special Geodesy, e-mail: jaromir.prochazka@fsv.cvut.cz Faculty of Civil Engineering, Czech Technical University, Thakurova 7, 166 29 Prague 6, the Czech Republic Abstract Two projects under execution are focused on long-term monitoring of historical buildings and on research and verification of methods of slope movement monitoring. Combination of different geotechnical and geodetical methods are used. Requirements for accuracy and lifetime of site instrumentation and availability of data gathering are very different. Observational method is used to describe behaviour of historical buildings by sets of displacement data for static analyses, future numeric modelling and assessment of development of their technical state in the Prague Castle Area. Observations are provided with combination of different methods of surveying, crack and temperature measurements for longer time. These methods are enhanced by line-wise measurements using high-precision sliding micrometer and inclinometer in combined casing to assess the role of subsoil and to determine possible very slow slope movements in inclined parts of the area. Selection of model sites in North Bohemia with existing slope movements/slides was based on previous experience. Methodology of systematic approach of monitoring of slope movements is under further development using combination of set of methods. Project is focused on investigation of limits of applicability of slope stability monitoring in relation to site conditions and to assessment of slope stability and mass deformation development. 1. Introduction 1.1 Pilot project of monitoring of the Prague Castle The Prague Castle is a large area variously aged of historical monuments. Some objects were observed before the project described in this paper started. Particular objects of the Prague Castle have been already monitored since year 1999. This task has been encouraged by the Static Design Office Kristek & Trcka, tended by the Prague Castle Administration Office. Based on previous activities in the Prague Castle Area, we have been working on 3-year project called "System of monitoring of engineering conditions and predictions of their development for historical buildings and its application for the Prague Castle Area". The project has started in 2001 under support of the Czech Grant Agency. Systematic approach is used in the project. Development of a new enhanced system of monitoring is based on archive search of a foretime made reports, measured data and observed faults / displacements, measuring marks etc. Technical passports of selected buildings were made prior to the project development. Preliminary analyses of faults were made and extension of existing monitoring system was designed to describe structure / subsoil interaction to gather relevant data for further static analyses and risk evaluation of selected buildings. An enhanced monitoring system was designed and partially installed in 2001 and 2002. An effort of prediction of the development of engineering conditions will be based on static model of the structure of the Saint Vitus Cathedral using methods of numeric modelling in the last