Examples geotechnology

The picture shows a track section between km 1.300 and km 1.900 (see horizontal axis). The vertical axes represent both depth in m related to top of sleepers and travel time of the waves in nanoseconds.

In that section the ballast has been renewed to a depth of 0.5 m (pale grey layer). Below, there is fouled ballast (dark grey layer). Ballast settlements can be seen between km 1.460 and 1.570. This is an indication for insufficient bearing capacity of the sandy subgrade (yellow layer). Below the sandy formation there is clay to be found. Between km 1.600 and km 1.900 the clay layer is almost adjacent to the ballast bed. In this section, a well working drainage is important. Otherwise water will remain inside the track, leading to eventual stability problems of the track.

The picture shows crossings at km 1.370 and km 1.870. Drillings have been carried out at km 1.550 and km 1.740. In both cases ground water has been found in a depth of 1.2 m.

The picture shows a track section between km 11.100 and km 11.700.

In that section the ballast has been renewed to a depth of 0.3 m. Below, there is fouled ballast (dark grey layer). Ballast settlements indicate insufficient bearing capacity of the sandy formation. Below the sandy layer, a drilling at km 11.450 is showing peat and clay.

The radargram shows a track section between km 70.700 and km 71.400. The predominantly clean ballast bed (pale grey layer) is regularly shaped and even. This indicates a good bearing capacity of the track. Below the ballast bed there is a moderately undulated intermediate layer consisting of sand. According to drilling information at km 70.740, km 71.020 and km 71.320 the formation consists of fine sand.

Slightly increased moisture can be identified in the range of the ballast base. Crossings can be seen at km 70.815 and km 71.025.