挤压性软岩流变参数反演与本构模型辨识

Inversion of Mechanical Parameters of Squeezing Soft Rock and Identification of Rheological Model

研究目的:为合理确定挤压性岩体力学性态的各有关参数,正确认识岩体力学属性并确保数值计算结果的可靠性,将隧道现场监测变形时间序列作为依据,通过位移反演分析理论,获得对隧道围岩稳定分析结果影响显著的流变参数值,进而实施流变模型辨识,为隧道工程围岩稳定性分析提供合理的本构模型和切合实际的计算参数。研究结论:针对挤压性软岩隧道,建立了一套基于实测位移序列的模型辨识与参数反演的方法,该方法既依赖于工程地质和岩石力学理论,又依托于岩体工程现场实际量测,是联系理论实际的桥梁。

Research purposes： Rational mechanics parameter of squeezing rocks is very important for understanding the mechanical characteristic of rocks and improving the reliability of numerical simulation. Based on the displacement time series from field monitoring, rheological parameter of rocks were obtained with numerical inversion analysis method, and visco- elastic constitutive model for squeezing rocks were identified in this paper. Rational constitutive model and rheological parameter can be provided for stability analysis of tunnel in squeezing ground. Research conclusions： A method for identification of rheological model and inversion of mechanical parameters was proposed. This proposed method is based on the theories of rock mechanics and on -site measurement, which can be as the bridge linking the theory with practice.