Methodology for extrapolation of rock mass deformability parameters in tunneling

Abstract

This article proposes one approach for extrapolation of necessary parameters for numerical analyses in tunnelling. The approach is named as an empirical - statical - dynamical method for extrapolation. The proposed methodology is based on combination of empirical classification rock mass methods, geophysical measurements and direct dilatometer deformability testing on a field. The analyses are prepared for purposes of investigation and design for several tunnels in Republic of Macedonia. One example for dividing of tunnel length in quasi-homogenous zones, as a basis for forming of geotechnical and numerical model that can be a basis for interaction analyses of rock - structures system and stress-strain behaviour of rock massif, is also given. The several original regressive models between rock mass quality, deformability and velocity of longitudinal seismic waves are shown.U ovom radu prikazan je jedan pristup za ekstrapolaciju ulaznih parametara za naponskodeformacijske analize kod tunela. Postupak je nazvan empirijsko-staticko-dinamicki metod ekstrapolacije, a zasniva se na paralelnoj primeni empirijskih klasifikacionih metoda stenskih masa, geofizickih merenja i terenskih ispitivanja deformabilnosti metodom sondaznog dilatometra na nekoliko lokacija u Republici Makedoniji. Kao primer, prikazano je izdvajanje kvazihomogenih zona koje su osnova za definisanje geotehnickih i numerickih modela. Oni se, dalje, koriste u analizama interakcije objekta i stenske mase i procene naponsko-deformacijskog stanja stenske mase. Takodje, u radu je prilozeno i nekoliko originalnih regresionih modela.