Empirical-Statical-Dynamical (ESD) Methodology for Extrapolation of Rock Mass Properties for Construction of Tunnels

The investigation in rock masses in interaction with engineering structures is extremely important in a process of design of tunnels. The main problem is how to extrapolate the parameter from the zone of testing to the whole volume that is of interes for interaction analyses of the system rock mass-structure. In this article Empirical-Statical-Dynamical (ESD) methodology of extrapolation is presented. The basis of the methodology lies in combination of the results from geotechnical and geophysical testings and rock mass classification, connected with definition of adequate regressive models.

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Rock mass classification for sedimentary rock masses in Indonesia coal mining areas

10.1063/5.0007049 ◽

2020 ◽

Author(s):

Singgih Saptono ◽

M. Rahman Yulianto ◽

Vega Vergiagara ◽

Herry Sofyan

Keyword(s):

Rock Mass ◽

Coal Mining ◽

Sedimentary Rock ◽

Rock Mass Classification ◽

Rock Masses ◽

Mining Areas ◽

Mass Classification

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Application of rock mass classification techniques to weak rock masses: A case study from the Ruahine Range, North Island, New Zealand

Canadian Geotechnical Journal ◽

10.1139/t08-019 ◽

2008 ◽

Vol 45 (6) ◽

pp. 800-811 ◽

Cited By ~ 6

Author(s):

Martin S. Brook ◽

Erin Hutchinson

Keyword(s):

Rock Mass ◽

New Zealand ◽

Rock Mass Classification ◽

Early Pleistocene ◽

Weak Rock ◽

Rock Masses ◽

Classification Techniques ◽

Classification Schemes ◽

Mass Classification ◽

Weak Rock Masses

Rock mass classification systems were first generated for use in engineering applications, but their potential for utilization in geomorphic studies has since been recognized. These techniques were mostly developed for hard rock environments, and questions remain about their applicability to weak rocks. Here, the applicability of three rock mass classification techniques (rock mass strength (RMS), rock mass rating (RMR), and slope mass rating (SMR)) to weak rock masses was analyzed. Techniques incorporated parameters such as uniaxial compressive rock strength, discontinuity condition and orientation, and groundwater ratings. Rock mass classification values were determined from 14 profiles sited on recently excavated road cuttings on the Saddle Road, in the Ruahine Range, North Island, New Zealand. This is an important transport route across the North Island’s axial ranges, with the road excavated into weak late Pliocene – Early Pleistocene mudstone. Mean slope and minimum slope angle were measured at each profile in concert with the rock mass classification schemes. The three classification techniques all appear to have limited usefulness given the subaerial conditions prevalent at the study site. It would appear that the relative weightings of the different parameters within the RMR, RMS, and SMR classification schemes would need modifying for weak rock masses, but the precise details of this are difficult to determine.

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