The Himalayas are one of the most unstable regions in the world. Underground excavations
are very challenging in this region due to the fragile geology, tectonic activities and complex …

A preliminary support design is the basic output of an empirical rock mass classification
system. Tunneling quality index (Q) and rock mass rating (RMR) systems are used …

The results of geotechnical explorations, engineering geological investigation (including
laboratory and in situ tests) and field observations have been used, along with borehole …

At the initial phases of tunnel design, information on rock properties is often limited. In such
instances, the engineering classification of the rock is recommended as a primary …

This study deals with the comparative investigation on various classification/characterization
systems for sedimentary rocks in two parts, 40 km-long of the Zagros tunnel, west of Iran …

The basic quality (BQ) system is regarded as the national rock mass classification system
that can be appropriate for use in most types of rock engineering in China. Two underlying …

Rock mass classification systems are valuable tools for estimating design parameters of rock
engineering projects. In some cases, due to the lack of enough geological data, it may not …

The modelling tools for soils and rocks require more and more specific parameters not
always available from the standard or usual survey campaigns, this generally for reasons of …

Rock mass classification systems have become one of the most important and necessary
tool for determining the composition and characteristics of a rock mass. Its application in the …

Engineering rockmass classifications are an integral part of design, support and excavation
procedures of tunnels, mines, and other underground structures. These classifications are …