This paper describes an application of the geological strength index (GSI) method to the San Mauro formation, which is characterized by sandstones alternating with argillaceous marls. The Sandstone/Pelite (S/P) ratio and structural complexity were determined. Geo-structural and geo-mechanical surveys were undertaken in situ and rock samples were tested in the laboratory. A map of the S/P ratio was produced showing the bedrock divided in four classes. Three ranges of GSI values were identified. The values of the intact UCS and of the constant mi were appropriately reduced to reflect the variable presence of sandstone compared with the pelitic fraction. A ‘‘weighted average’’ of the intact strength properties of the hard and weak layers was adopted. The values for the intact materials were reduced from 20 to 60% depending on the GSI categories of the heterogeneous rock mass. In this way, seven classes of rock masses characterized by different values of GSI, reduced UCS and mi values were identified.

Heterogeneous rock mass classification by means of the geological strength index: the san mauro formation (cilento, italy) / Budetta, Paolo; Nappi, Michele. - In: BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT. - ISSN 1435-9529. - 70:4(2011), pp. 585-593. [10.1007/s10064-011-0351-1]

Heterogeneous rock mass classification by means of the geological strength index: the san mauro formation (cilento, italy)

BUDETTA, PAOLO;NAPPI, MICHELE
2011

Abstract

This paper describes an application of the geological strength index (GSI) method to the San Mauro formation, which is characterized by sandstones alternating with argillaceous marls. The Sandstone/Pelite (S/P) ratio and structural complexity were determined. Geo-structural and geo-mechanical surveys were undertaken in situ and rock samples were tested in the laboratory. A map of the S/P ratio was produced showing the bedrock divided in four classes. Three ranges of GSI values were identified. The values of the intact UCS and of the constant mi were appropriately reduced to reflect the variable presence of sandstone compared with the pelitic fraction. A ‘‘weighted average’’ of the intact strength properties of the hard and weak layers was adopted. The values for the intact materials were reduced from 20 to 60% depending on the GSI categories of the heterogeneous rock mass. In this way, seven classes of rock masses characterized by different values of GSI, reduced UCS and mi values were identified.
2011
Heterogeneous rock mass classification by means of the geological strength index: the san mauro formation (cilento, italy) / Budetta, Paolo; Nappi, Michele. - In: BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT. - ISSN 1435-9529. - 70:4(2011), pp. 585-593. [10.1007/s10064-011-0351-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/378735
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