Prognosis of underground structures deterioration based on in-situ measurements

摘要

The stability of the underground structure is very important not only from the point of view of the structure itself, but also from the point of view of other structures, which are in the close vicinity, generally above it. Therefore, the evaluation of the process of deterioration can help us very much. By the fact that underground structures are very often under the influence of cyclic loading, sometimes under the influence of some accident - natural hazards, as earthquake, floods, fire etc. the evaluation of the existing state is important. In the paper in-situ measurements by classical methods of monitoring based generally on personal observation supplemented by deformation measurements will be described. This information is important but limited to certain time intervals and is able to give signals about changes in macro-scale. The second part of the paper is focused on the adaptation of new methods: micro technology of monitoring - such as MEMS (Micro Electrical Mechanical Systems) and wireless technologies for data transfer. It is obvious that such new technologies have to be assessed for the ability to deliver data continuously (very often connected on warning system when the data are exceeding the limit values) and for their safety and solidity. At the end of the paper the conveniences, disadvantages and limiting capabilities of above mentioned methods will be summarized.