Q-system

From Wikipedia, the free encyclopedia

You have new messages (last change).
For the linguistics formalism, see Q-systems.

The Q-system of rock mass classification was developed in Norway in 1974. The system was developed on the basis of an analysis of 212 tunnel case histories from Scandinavia. It is a quantitative classification system and is an engineering system facilitating the design of tunnel supports. Q-system use six different parameters to assess the rock mass quality. The parameters are:

  • Rock Quality Designation RQD
  • Joint set number Jn
  • Roughness of the most unfavorable joint or discontinuity Jr
  • Degree of alteration of filling along the weakest joint Ja
  • Water inflow Jw
  • Stress Reduction Factor SRF

The Q-factor can then be calculated as:

Q=\frac{RQD}{J_n}\frac{J_r}{J_a}\frac{J_w}{SRF}
Retrieved from "http://en.wikipedia.org../../../q/-/s/Q-system.html"