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Abstract After being cut by some sets of structural surfaces，the large broken rock mass remains certain strength under different confining pressures. Due to the lack of quantitative description of rock structures，those parameters such as m and s values are difficult to be determined by Hoek-Brown strength criterion. Based on the defects of traditional RQD concept，by introducing the concept of 3D V.RQD under different threshold values，a kind of computer simulation method of V.RQD value was established. Then，combining RMR rating criteria and Hoek-Brown strength criterion，by discussing the influence of the threshold range of 3D V.RQD，some important laws which can lead to change of rock quality parameters such as m and s values and Hoek-Brown strength envelope as well as the rock deformation modulus E0 were achieved. As a result，an important quantitative relation between V.RQD value and broken rock mass strength was resolved. The conclusions show that the V.RQD value，one of the rock quality indices，may become a new and practical way to accurately estimate the strength of broken rock mass.
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Received: 10 January 2010
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