Heterogeneous rocks in engineering geology can pose significant challenges in geotechnical design due to their anisotropic behavior. Therefore, it is very important to understand the geomechanical behavior of heterogeneous rocks, which depends on the proportion of individual rocks and structural characteristics, which means that the classification of such rocks in the engineering-geological inventory the proportion of individual lithological units and discontinuities must be determined as accurately as possible. Such rock is also flysch, which is characterized by cyclic alternation of fine-grained and coarse-grained clastic rocks, sometimes with intermediate layers of limestone, breccia, conglomerate or calcarenite. The dependence of stability on structural characteristics, which depend on the properties of discontinuities, is very visible in flysch. In my master 's thesis, I checked the stability of excavated slopes in flysch with an emphasis on determining the discontinuity parameters and their inclusion in the analyzes. Field work with a detailed engineering-geological inventory of flysch outcrops was in the SW part of Slovenia, near Črni Kal, in the area of construction of 2nd rail Divača–Koper, with emphasis on established manual methods for determining discontinuity properties and taking samples for laboratory tests. With the obtained data I classified flysch according to established classification systems, namely RMR (Rock Mass Rating) and GSI (Geological Strength Index), geomechanical parameters were taken from previous research in similar rocks. I also performed analytical analysis with the program RocPlane, numerical analysis with the program Slide2 and compared the suitability of using the programs in stability analyzes in flysch.
|
