Engineering-geological typification of rocks of the red-colored terrigenous formation

   The main objective of rock typification of the described formation in the present work is to establish the spatial and temporal relationship and the degree of influence of genetic and lithological features of the development conditions of rock complexes of the red-colored terrigenous formation on the formation of engineering and geological properties.

   The role of post-genetic processes is essential for rock formation. Depending on the direction of the process, it can have both positive influence (strengthening of structural bonds) and negative influence in the form of changes in mineralogical composition and destruction of previously formed structural bonds. The processes of progressive lithogenesis, corresponding to the stage of diagenesis and catagenesis of sedimentary formations, lead to a fundamental transformation of the nature of structural bonds in the soil and, as a consequence, their properties. The development of these processes in geologic history is related both to the geological and structural position of the massifs and to the duration of their occurrence. In this regard, older altered soils have, as a rule, higher strength characteristics. This is especially clear in postgenetic transformations of clayey and initially sandy soils (the latter are transformed into sandstones). The author of the study did not aim to classify all the rocks of the formation. The most characteristic and significant from the engineering-geological point of view genetic complexes of rocks were identified, which allow to show the influence of the diversity of sedimentation conditions on the formation of soil properties. The paper presents the systematization of sedimentation conditions, which made it possible to create an engineering-geological typification of rocks and determine the hierarchy within the formation by linking rocks and facies to genetic complexes.

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