Analysis of nonlinear dynamic character in the surrounding rock system for deep buried underground engineering  

作　　者：ZHAO Yu PENG Hal-you 

机构地区：[1]College of Civil Engineering, Chongqing University, Chongqing 400045, China [2]Education Ministry＇s Key Lab for the Exploitation of Southwestern Resources ＆ Environmental Disaster Control Engineering, Cbongqing University, Chongqing 400044, China

出　　处：《Journal of Coal Science & Engineering(China)》2010年第4期362-366,共5页煤炭学报（英文版）

基　　金：Supported by the New Century Excellent Talent Foundation from MOE of China(NCET-09-0844);the National Natural Science Foundation of China(50804060,50621403)

摘　　要：Combining the field monitoring results of a deep-buried tunnel in Chongqing,the dynamic characteristics of the surrounding rock system under high in situ stress wasanalyzed by phase space reconstruction, calculating correlation dimension, Kolmogoroventropy and largest Lyapunov exponents.Both the Kolmogorov entropy and largestLyapunov exponents show that the surrounding rock system is a chaotic one.Based onthis, a local model was applied to predict surrounding rock displacement, and a nonlineardynamic model was derived to forecast the interaction of the surrounding rock and supportstructure.The local method was found to have an extremely small total error.Also, thenonlinear dynamic model forecasting curves agree with the monitoring ones very well.It isproved that the nonlinear dynamic characteristic study is very important in analyzing rockstability and predicting the evolution of rock systems.Combining the field monitoring results of a deep-buried tunnel in Chongqing, the dynamic characteristics of the surrounding rock system under high in situ stress was analyzed by phase space reconstruction, calculating correlation dimension, Kolmogorov entropy and largest Lyapunov exponents. Both the Kolmogorov entropy and largest Lyapunov exponents show that the surrounding rock system is a chaotic one. Based on this, a local model was applied to predict surrounding rock displacement, and a nonlinear dynamic model was derived to forecast the interaction of the surrounding rock and support structure. The local method was found to have an extremely small total error. Also, the nonlinear dynamic model forecasting curves agree with the monitoring ones very well. It is proved that the nonlinear dynamic characteristic study is very important in analyzing rock stability and predicting the evolution of rock systems.

关 键 词：nonlinear dynamics ROCK deep-buried underground engineering 

分 类 号：TU94[建筑科学—建筑技术科学] U463.335.1[机械工程—车辆工程]