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Abstract The instable failure of laminated plate with low tensile strength was explained with the theory of elastic stability. The granite plates of 80 mm in width，270–420 mm in length and 8–20 mm in thickness were compressed using the rigid loading heads with or without the soft rubber cushions of 5–10 mm in thickness. The plates with thickness over 16 mm failed in laminated style and the strength did not increase with the increase of the thickness and was about 40% of the uniaxial compressive strength of standard cylinder sample. The thinner plates were described with Euler?s instability of compression. Similarly，the uniaxial compressive strength was much lower than that from the trend of strength with confining pressure due to axial instability of laminated rock. The surrounding rock with low tensile strength may be structurally instable and zonal disintegrated in deep tunnel under the axial stress.
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2015, Vol. 34 
