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Publications by [Palmstrom A.]

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<p>The most challenging rock mass conditions in hard rock subsea tunnels are represented bymajor faults/weakness zones. Poor stability weakness zones with large water inflow can be particularly problematic. At the pre-construction investigation stage, geological ...
Reference: Strait Crossings 2013 16. – 19. June, Bergen, Norway
The main rockmass classification systems make use of similar rockmass parameters. It is therefore shown how the input parameters of the RMR, Q and RMi systems can be combined into one set of tables. These enable the ground quality to be found directly and ...
Reference: Palmstrom, A., 2009: Combining the RMR, Q, and RMi classification systems. www.rockmass.net, 25p
The paper describes the history of the Q-system that was introduced in 1974, and its later development. The individual parameters are analysed, and their relevance for the natural geological features they seek to simulate, is discussed. It is concluded that ...
Reference: Published 2006 in Tunnels and Underground Space Technology, vol. 21, pp. 575-593
Various measurements of the block size or degree of jointing (i.e. density of joints, RQD, block volume, joint spacing) are described. It is concluded that the RQD measurements are encumbered with several limitations and that this parameter should be applied ...
Reference: Published in Tunnels and Underground Space Technology 20 (2005) 362-377
The role of classification in rock engineering and design is discussed. It is important to distinguish between characterization, classification and empirical design method. The classification systems used today should, strictly speaking, either be described ...
Reference: Tunnelling and underground space technology, Vol. 18, 2003, pp. 331 – 345
Three methods of in situ deformation modulus (Em) measurements of rock masses have been described, analysed and compared. The plate jacking (PJT) test, where the deformations are measured by extensometers in drill holes, gives generally the best results. A ...
Reference: Tunnelling and Underground Space Technology, Vol. 16, No. 3, 2001, pp. 115 - 131.
In this paper three methods of in situ deformation modulus (Em) measurements of rock masses have been described, analysed and compared. The plate jacking (PJT) test, the Goodman jack test and the plate loading test.
Reference: Tunnelling and Underground Space Technology, Vol. 16, No. 3, 2001, pp. 115 - 131.
The RMi (rock mass index) system applies input of block size, joint characteristics and strength of intact rock to express the uniaxial compressive strength of a rock mass. From practical use in more than 5 years the RMi rock support method has been further ...
Reference: Journal of Rock Mechanics and Tunnelling Technology, vol. 6, no. 1, May 2000, pp. 1 – 19
The RMi system is based on defined inherent parameters of the rock mass and is obtained by combining the compressive strength of intact rock and a jointing parameter. The jointing parameter represents the main jointing features, namely block volume (or density ...
Reference: Tunnelling and Underground Space Technology Volume 11, Issue 3, July 1996, Pages 287–303
The Rock Mass index, RMi, has been developed to satisfy a need for a strength characterization of rock masses for use in rock engineering and design. The method gives a measure of the reduction of intact rock strength caused by discontinuities given by RMi ...
Reference: Tunnelling and Underground Space Technology Volume 11, Issue 2, April 1996, Pages 175–188