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Abstract Geological strength index(GSI) is an important parameter of Hoek-Brown criterion. However，there are not any typically measurable parameters during determination of GSI，which leads to the highly subjective value of GSI. Based on the study of rock mass of detailed geotechnical investigation in the region where is abundant of gneiss，the authors propose that a quantitative analysis method should be used to GSI，according to the parameters such as rock core length(RCL) and Jc，and trying to utilize the photos of the intact core in the field site to substitute the sketch of rock mass structure in GSI，Ultimately，the authors set up a new generalized GSI. In terms of the contrast of calculation of ultimate bearing capacity for rock foundation by the authors and the values given by the unit of investigation，the authors find that the results fit well and the precision is high，which means it is scientific of these charts.
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Received: 05 January 2012
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2013, Vol. 32 
