National Laboratory for Civil Engineering (INEC), Lisbon, Portugal.

• Preface -- Organization -- Special lectures -- Scale effects in rock engineering - An overview of the Loen Workshop and other recent papers concerning scale effects /A.Pinto da Cunha -- The scale dependency of in situ rock stress measurements /F.D.Cuisiat & B.C.Haimson -- Scale effects in rock masses - A general report on the papers submitted to the Lisbon Workshop /A. Pinto da Cunha -- 1 Scale effects in the determination of the defo rmability and strength of rock masses -- Scale effects in the elastic moduli and strength of jointed rock masses /H.-K.Moon & C.-Y.Kim -- Scale invariance in stochastic fracture of rocks /V.V.Silberschmidt -- Two types of brittle fracture of silicate rocks and scale effect on rock strength: Their implications in the earth's crust /M.Shimada -- The cutting constant of the rock does not depend on scale effect and rockmass jointing /V.Krupa, F.Krepelka, J.Bejda & P.lmrich -- Influence of size of cutting indentor and scale effect in rock mass strength determination /F.Krepelka, P.lmrich & V.Krupa -- Scale effects in hollow cylinder tests /C.Ringstad, M.A.Addis, I.Brevik & F.J.Santarelli -- Fractal clustering of rock fractures and its modeling using cascade process /H.Yamamoto, K.Kojima & H.Tosaka -- A case review of the deformation modulus of rock mass: Scale effect /J.He -- Scale effects on underground openings according to their constructional sequences /K.Fukushima -- Scale effect on rock mass strength and stability /G.E.Exadaktylos & C.E.Tsoutrelis -- Effect of scale on roughness anisotropy and magnitude /J.P.Harrison & R.J.F.Goodfellow -- Scale effect assessment on the basis of mine surveying data /M.A.Iofis -- Experimental and analytical studies on mechanical properties of layered soft rock mass /Y.Miyaike, N.Mizuno, Y.Momose & J.Nakamura -- Progressive failure of rock masses by a self similar anastomosing process of rupture at all scales and its scale effect on their shear strength /G.Archambault, A Rouleau, R.Daigneault & R.Flamand -- Scale effects on shear strength and deformability of rock joints /R.Yoshinaka, J.Yoshida, H.Arai & S.Arisaka -- Scale effects in the 'micro-scale' rock mechanics problems /R.Mancini, M.Cardu, M.Fornaro & M.Linares -- Different scale elastic wave velocity variations under technogene impact /AL Savich, M.M.Ilyin & O.V.Kozlov -- Shear strength scale effect and the geometry of single and repeated rock joints /Y.Ohnishi, H.Herda & R.Yoshinaka -- Size-scale dependence of mechanical properties: A method of quantitative evaluation /J.F.Schatz -- Scale factor in rock masses as affected by geological conditions /A.Varga -- In-situ loading tests using the large-sized concrete block for weathered granite /R.Yoshinaka, T.Endo, N.Nomura & K.Yamagishi -- Rock mass sampling conditions needed to overcome the scale effect /M.l.Leal Gomes -- On the effect of block size on the shear behaviour of jointed rock masses /A.A.AI-Harthi & S.R.Hencher -- The definition of intact rock and its application to the determination of the smallest spacing between discontinuities in rock masses /L.A.Ayres da Silva & H.Born -- A methodology for rock mass compressive strength characterization from laboratory tests /l.A.Ayres da Silva & W.T.Hennies -- Scale effect in rock axial splitting /V.N.Odintsev -- Scale dependent shear strength of rock joints /S.R.Hencher, J.P.Toy & A.C.Lumsden -- Studies of scale effect in plate loading tests /l.Miofis & V.l.Rechitski -- Scale effect in the deformational behaviour between convergence measurements and borehole jacking through joint stiffness /C.Tanimoto, K.Kishida & H.Yoshida -- Assessing limestone strength with the point load test /M.O.Quinta Ferreira & A.P.Gerardo Machado -- Scale effects on the deformability of jointed rock at the three-dimensional level /P.H.S.W.Kulatilake, S.Wang & O.Stephansson -- Size effect on strength and deformability of brittle intact rock /S.Kramadibrata & L.O.Jones -- Research on scale effects in the determination of rock mass mechanical properties The Portuguese experience /A.Pinto da Cunha -- 2 Scale effects in the determination of internal stresses in rock masses -- Stress measurements and micro-heterogeneity effects /R.Corthesy, D.E.Gill, M.R.Leite & A.Nefzaoui -- 3 Scale effects in the determination of hydraulic properties of rock masses -- Characteristics of seepage flow through the actual rock joints /K.Kikuchi & Y.Mito -- Scale effects in hydraulic properties determined by in-situ 3-D tests /E.F.de Quadros & D.Correa Filho -- Fracture scale effects in hydrocarbon reservoirs /Kl.Heifer & N.C.Koutsabeloulis -- Investigations of the groundwater transport characteristics of a large fracture zone in a granite batholith at different size scales /C0C.Davison, L.H.Frost, E.T.Kozak, N.W.Scheier & C.D.Martin -- 4 Supplement -- Fracture properties from laboratory and large scale field tests: Evidence of scale effects /J.E.Gale -- Author index.