Admin Table of Contents
Who developed Q-system?
Alain Colmerauer
Q-systems are a method of directed graph transformations according to given grammar rules, developed at the Université de Montréal by Alain Colmerauer in 1967–70 for use in natural language processing.
What is Q value in rock?
Classification of the rock mass The rock mass quality (Q) is a very sensitive index and its value varies from 0.001 to 1000. Use of the Q-system is specifically recommended for tunnels and caverns with an arched roof.
What is rock mass classification system?
Rock mass classification systems are used for various engineering design and stability analysis. These are based on empirical relations between rock mass parameters and engineering applications, such as tunnels, slopes, foundations, and excavatability.
What is RMR in geology?
The rock mass rating (RMR) is a geomechanical classification system for rocks, developed by Z. T. Recently RMR14 has been proposed to improve the RMR performance by incorporating new experiences from tunnel practices.
How is SRF calculated?
Ratings for SRF are given in Table 8.6….Stress Reduction Factor.
| Conditions | SRF | |
|---|---|---|
| (a) Weakness zones intersecting excavation, which may cause loosening of rock mass when tunnel is excavated | ||
| B | Single-weakness zones containing clay or chemically disintegrated rock (depth of excavation ≤50 m) | 5.0 |
What is Rqd soil investigation?
Rock quality designation (RQD) is a standard technique in the mining industry for the qualitative and quantitative assessment of rock quality and degree of jointing, fracturing, and shearing in a rock mass.
What is RMR and SMR?
Rock Mass Rating (RMR) has been widely used as a method of classifying the strength of the rock mass. RMR values are then correlated into Slope Mass Rating (SMR) which is a system of classification of a rock slope.
What is the role of mapping in tunnel construction?
mapping is to provide a complete graphical and written record of all features of geological significance and may require projection into the plane of the map of structures observed in the arch or invert.
What is Q system in rock Mechanics?
The Q-system is developed to classify rock masses around an underground opening, as well as for field mapping. Based on estimation of six rock mass parameters, a Q-value for a rock mass can be calculated. This value gives a description of the rock mass quality.
What is RQD rock mechanics?
Rock-quality designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more. In this respect pieces of core that are not hard and sound should not be counted though they are 100 mm in length.
Is RQD a code?
on a modified core recovery procedure, which in turn, is based indirectly on the number of fractures and the amount of softening or alteration in the rock mass as observed in the rock cores from a drill hole. RQD shall be based on IS : 11315 ( Part 11) – 1985*.
What is intact rock?
Intact rock refers to the unfractured blocks between discontinuities in a typical rock mass. The properties of intact rock are governed by the physical properties of the materials of which it is composed and the manner in which they are bonded to each other.
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