engleski

Design of engineered slopes in flysch rock mass

The method for the design and realization of systems for ensuring stability of cuts in flysch formations, with an interactive approach based on stress-strain back analyses, is presented. Flysch formations can be regarded as materials belonging in a transitional zone between soft rocks and hard soils. Based on results obtained by laboratory and in-situ investigations in various stages of design and realization of projects, it can be concluded that the strength and deformability parameters for flysch can not accurately be determined by traditional methods, and that it is very difficult to adopt realistic design parameters. An interactive design procedure to be applied during realization of cut support constructions in flysch formations is proposed. The use of proposed methods is presented and illustrated by examples of cuts realized in flysch on the Adriatic motorway route in the vicinity of the town of Rijeka, Croatia. Design procedures used for ensuring stability of cuts are based on results obtained by geotechnical investigations as well as on classifications for heterogeneous rock formations. The system for monitoring behaviour of flysch formations in cuts is established, and flysch formations are classified in open side cuts through geotechnical supervision. Relevant data are used in stress-strain back analyses, so as strain properties of flysch are varied in order to harmonize measured and calculated displacements at cut locations. The results of these analyses either confirm the predictions or require modifying the design support systems in order to ensure cuts stability in flysch formations.

slope stability; flysch; support system; observational methods

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