STUDY ON CHAOS DYNAMIC PARAMETERS OF SURROUNDING ROCK DIAPLACEMENT OF UNDERGROUND GRAVE
It is an important to evaluate surrounding rock stability and analyze surrounding rock stressstrain for engineering and constructing, and the most direct way is to analyze the measuring displacement of underground powerhouse. Combining measuring displacement, dynamic characteristics of displacement of are studied. G-P method is improved by setting Thefler window W, by which eflictively eliminating bad effect of time series relativity, and can avoid taking non-convergent correlation dimension wrongly as finite dimension, and C(r) is calculated and determined by setting W to obtain relatively impersonal correlation dimension D through fitting definition linear region. Many analysis methods, as is G-P method, C-C method and multiple autocorrelation method, have been synthetically analyzed to obtain optimum correlation dimension m and delay time τ. The maximum lyapunov exponents are calculated after phase space is reconstructed through the optimized values of m,τ. Results show most of the displacements have chaos features. So most of displacement take chaos feature, and correlation dimension D is greater than zero and fractai, optimize values of m,τ are obtained and maximum iyapunov exponents λ1 is greater than zero; While data of crown and those of abutment within30m depth dont have chaos dynamic feature with D equal to zero. The study provides with a new method for similar practice, and a new thought for prediction the surrounding rock displacement of underground powerhouse.
surrounding rock displacement chaos characteristic parameters correlation dimension D maximum lyapunov exponent λ1
Ma Sha Zhang Shexiang Dan Jian-Jun
North China Institute of Water Conservancy and Hydroelectric Power, Henan Zhangzhou, 450011, China Luoyang Water Conservancy Engineering Bureau, Luo yang, 471001,China
国际会议
长沙
英文
2840-2843
2010-05-11（万方平台首次上网日期，不代表论文的发表时间）