深埋隧道围岩与支护结构相互作用的非线性动力学特性研究

为了充分了解围岩与支护结构动力系统的变化特征,根据现场实测数据分析深埋隧道的围岩稳定性,对提取的时间序列进行相空间重构,计算了关联维数,定性分析了系统的混沌动力学特性.进一步应用反演理论,建立了深埋隧道围岩系统的非线性动力学模型,通过模型逼近,获得待定参数和正演模型的各变量,定量的分析了系统的混沌动力学特性,结果表明,各变量计算与实测的分布曲线非常接近.利用该模型可较好地预测在高地应力条件下围岩与支护结构系统各特征变量的变化规律.

Study on Nonlinear Dynamic Character of Interaction between Surrounding Rock and Support Structure of Deep Buried Tunnel

For fully understanding the variation characteristics of the surrounding rock and dynamic system of support structure, the stability of surrounding rock was analyzed based on measuring results of one deep-buried tunnel.Chaotic dynamic characteristics of surrounding rock and support system under high in-situ stress was studied by phase space reconstructing parameters in measuring results of time series and calculation of correlation dimension.A nonlinear dynamic model for surrounding rock of deep buried highway tunnel was established with inversion.Based on model approximation, undetermined parameters and the key variables were obtained to analyze the chaotic dynamic properties of the system quantitatively.The result shows that the calculated distribution curve of the variables agrees with the measured one very well.The dynamic model could be used to predict the variation of the system characteristic parameters of surrounding rock and support structure system for deep buried highway tunnel.