REASONS TO CHANGE THE TENDER PROJECT OF A TUNNEL DURING CONSTRUCTION

During construction, especially of tunnels, very often there is a need to change the tender technical documents, i.e. the documents upon which the construction permit is obtained and the tender is announced. The main reason for the change of documentation is, above all, unsuficient geotechnical investigations due to which technical solutions and calculations are inadequate. Very rearly documentation is changed due to errors in the calculation if the techncal review of documentation is correctly done. The paper presents an example of the change of documentation during construction and the reasons for that.