An important part of many site investigations is the geomechanical assessment of the rock mass in terms of a classification system which is independent of the user. All classification systems used to date are based on observation of the rock mass and the determination of simple engineering parameters on intact rock specimens. In this paper, the use of the seismic properties of the rock mass to assess the geomechanical performance of the rock mass are examined and illustrated by three case histories. (The investigation of Altnabraec granite, Caithness, Middle chalk at Mundford, Norfolk, and Dalradian schists.) It is shown that precise values of uniaxial compressive strength cannot be predicted from compressional wave velocity determinations, although rock types can be classified qualitatively (for example, weak to very weak or strong to very strong). For a specific lithology, the compressional wave velocity can be related to the degree of fracturing and an approximate relationship with RQD (rock quality designation) established.(A) For the covering abstract of the conference see IRRD 832042.

Rock mass assessment from seismic measurements . field testing in engineering geology. proceedings of the twenty-fourth annual conference of the engineering group of the geological society, sunderland polytechnic, september 4-8 1988

Recent advances in Seismic Codes increased the necessity in Engineering Geophysics to use surface wave analysis as a tool. The shear wave velocity profile had to be resolved to calculate the site amplification in case of an earthquake event, necessary also for seismic hazard studies. In our approach we present the results from Surface Wave data acquired in different site in Crete Island (Greece) at strong motion sites. Passive and Active data at linear and circular geometries have been analyzed and the corresponding processing and inversion results are compared. Although one would comment that there are discrepancies on Dispersion Curve results the resulted ground profiles up to a shallow depth show considerable agreement. However, this is site dependent and in order to increase the accuracy and reliability of results one should be careful with the assignment of different modes in surface wave analysis and also combine the results provided.

Different processing and inversion methods for resolving vs profiles in engineering geophysics using surface wave data

Η ποσοτική eκτίμηση των χαρακτηριστικών παραμέτρων της ισχυρής eδαφικής κίνησης στους eπιφανeιακούς γeωλογικούς σχηματισμούς έχeι ιδιαίτeρη σημασία στην τeχνική σeισμολογία και την eδαφομηχανική. Στο έργο “GEO  -CHARACTERIZATION” ΘΑΛΗΣ, μeλeτώνται οι γeωτeχνικές και γeωφυσικές τeχνικές ως μέθοδοι διeρeύνησης των γeωτeχνικών παραμέτρων του υπeδάφους. Eνώ οι γeωτeχνικές δοκιμές παρέχουν μe ακρίβeια τις γeωτeχνικές παραμέτρους, η κατασκeυή των γeωτρήσeων και η eκτίμηση των γeωτeχνικών παραμέτρων, eίναι ιδιαίτeρα δαπανηρή, ασαφής και χρονοβόρα διαδικασία. Οι γeωφυσικές μέθοδοι eίναι αποτeλeσματικές στη διeρeύνηση του υπeδάφους, αλλά τα αποτeλέσματά τους δeν μπορούν άμeσα να μeταφραστούν σe μeταβολή των γeωτeχνικών παραμέτρων. Μe σκοπό τη πληρέστeρη μeλέτη του υπeδάφους, σe σταθμούς eπιταχυνσιογράφων του E.Δ.E. (Eθνικού Δικτύου Eπιταχυνσιογράφων), θα  eκτeλeστούν  συμπληρωματικές  γeωτeχνικές  και τeχνικογeωλογικές eργασίeς  eνώ ταυτόχρονα θα eκτeλeστούν γeωφυσικές διασκοπήσeις. Το σύνολο των δeδομένων θα eπιτρέ   ψeι  τη  συσχέτιση  των  φυσικομηχανικών  παραμέτρων  (από  eργαστηριακές/eπιτόπου δοκιμές) μe τις γeωφυσικές παραμέτρους. Eπιπλέον, τα δeδομένα αυτά θα eπιτρέψουν τη dιeρeύνηση γeωτeχνικών προβλημάτων καθώς και την απόκριση των σχηματισμών που δομούν την πeριοχή σe eνδeχόμeνη δυναμική – σeισμική φόρτιση, eνώ θα προταθούν και τοπικά   κανονικοποιημένα eλαστικά φασμάτα σχeδιασμούτα οποία θα συγκριθούν μe τα αντίστοιχα φάσματα του Eυρωκόδικα 8 (EC8).

/pdf/geo-characterization-of-selected-areas-in-crete-greece-32rt9jsqlj.pdf

"Geo-characterization" of selected areas in Crete, Greece, towards realistic assessment of seismic design actions

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"Geo-characterization" of selected areas in Crete, Greece, towards realistic assessment of seismic design actions