The new line runs through an area with complex geological and hydrogeological conditions. During the cross-border cooperation as part of the INTERREG programme, the Saxon State Office for Environment, Agriculture and Geology (LfULG) and the Czech Geological Survey (ČGS) identified seven main geological units that are of particular importance for future in-depth investigations in the course of planning of the new railway line. These are as follows from north to south:
In addition, all route options cross several fault zones. The geotechnical assessment of the options under consideration will look not only at the geomechanical properties of the rock but also at the orientation of the main faults in relation to the intended line of the track. Fault zones are often characterized by areas of reduced shear strength. Planning work therefore needs to examine these locations especially closely. There is a need for more in-depth investigation in the area close to the border, where all route options converge and cross the intersection of the Gottleubatal zone with the Petrovice-Döbra structure. Building a tunnel through the Krušné hory fault zone on the southern edge (Czech side) of the Ore Mountains is a particular geotechnical challenge.
As part of the cross-border collaboration to develop rail traffic between Saxony and the Czech Republic, the Saxon State Office for Environment, Agriculture and Geology is providing expert support on geological aspects of the project.
From June 2020 to September 2021, subsurface investigations will be carried out at selected points along the existing line and in the study area for the new line to improve knowledge of subsoil conditions and allow this information to be incorporated into the future design. Samples of the soil and bedrock will be taken for geotechnical analysis.
Several drilling locations have been chosen in cooperation with the Saxon State Office for Environment, Agriculture and Geology (LfULG).
The following areas will be examined:
Contractors have been marking the drilling sites with wooden stakes since the beginning of June.
Investigation drillings started in July.