Reclamation of former brown coal mines: determining shear strength
Reclamation of former brown coal mines: determining shear strength
In the process of a hydraulic recultivation of former brown coal mines, it is necessary to address the issues related to the subsequent stability of the retaining slopes. It is evident that the determination of the design value of the shear strength of the soil will be crucial and decisive, particularly in relation to the contact between the clay and the coal seam in their natural position after being flooded with water. The determined values of the shear strength of the affected soils were used in stability calculations for the retaining slopes. In the first step a large-scale shear apparatus was designed and constructed. The test results provided the peak strength before the sample collapsed and the residual strength value determined by the movement of the soil along the shear plane. The large-scale shear field test provided a more precise view of soil behaviour, especially under lateral stress, on a larger scale. The determination of the actual values of the soil shear parameters can then be used for modelling the stability of the original/retaining slopes from the end of mining to lake filling.
Jiri Kostal; Petr Cernoch
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
Contact Information
- Secretary General - Dr A M McNamara
- Email: [email protected]
- Phone: +44 20 7040 8154
- City, University of London
- Northampton Square
- London EC1V 0HB. United Kingdom