Evaluation of Rock Burst Level Based on Combination Weighting-Cobweb Grey Target Model
Rock burst is one kind of a geological hazard that needs to be prevented and controlled in high-stress underground engineering,and the evaluation of rock burst strength has become an important research topic.In order to effectively predict rock burst disasters in underground rock mass engineering,a rock burst strength evaluation model based on combination weighting-cobweb grey target was proposed.Firstly,the rock brittleness coefficient σc/σt and stress coefficient σ0/σc,the elastic deformation energy index Wet and rock mass integrity coefficient Kv were selected as evaluation indicators for rock burst strength.Then,the classification criteria for rock burst levels was determined.The objective and subjective weights were calculated by using Critic method and ordinal relationship analysis(G1)method,and comprehensive weights were obtained by game theory combination weighting method.Based on the cobweb grey target theory,a range set of target distance ranges for different rock burst levels was established,and then the rock burst level was evaluated based on the target distance size of the indicators to be evaluated.The model was used to analyze the rock burst of Zhongnanshan Highway Tunnel Project.The research results show that the rock burst evaluation results based on the combination weighting-cobweb grey target model are basically consistent with the actual rock burst level,and the rock burst level evaluation model has a good practicality and reliability.
Rock burstLevel evaluationCombination weightingCobweb grey target
万方数据
维普
