Catastrophe progression method for stability classification of underground engineering surrounding rock

Based on the catastrophe progression theory,an integrative evaluation method for the stability classification of surrounding rock was presented.Five control factors,i.e.rock quality designation,uniaxial compressive strengthen,integrality coefficient,strengthen coefficient of structural plane and seepage measurement of groundwater,were selected in the analysis of multi-level objective decomposition.According to the catastrophe theory and the fuzzy member function,the data were normalized and the catastrophic affiliated functional value was calculated,then a catastrophe progression model was obtained to classify the stability classification of surrounding rock.12 samples of the first stage project in Guangzhou pump accumulator electricity station and 18 samples produced by the interpolation method were taken as the training samples.22 samples of the second stage project were selected to verify this method.Compared with the artificial neural network(ANN) method and support vector machine(SVM) method,the results show the catastrophe progression method has excellent performance and high prediction accuracy,and can be used to evaluate the stability of surrounding rock in underground engineering.