基于Hoek-Brown模型的铁路隧道围岩分级研究

Study on Classification of Railway Tunnel Surrounding Rock Based on Hoek-Brown Model

铁路是一种典型的带状交通工程,山区铁路往往穿越多种复杂的地质条件,地质勘察工作量大。为基于常规的地质调查,快速分析出沿线岩层的物理力学参数和围岩分级结果,基于Hoek-Brown强度准则,对岩体宏观物理力学参数进行反演预测,建立基于常规调查和室内试验的围岩宏观力学参数分级模型。同时,采用C#编制岩体宏观力学参数估算软件,应用该软件可以便捷地对岩体的多项宏观物理力学参数进行分析。通过模型各参数的敏感性分析,发现GSI的取值是影响隧道围岩物理力学参数的关键性指标,并重点对道扎子隧道围岩的宏观物理力学参数进行取值研究,基于分析结果对道扎子隧道混合岩地层的围岩进行快速分级,有效地指导工程设计。

Railway is a kind of typical zonal traffic engineering and the railway in mountain area usually encounters on its way many complex geological conditions and heavy geologic investigations are required.In order to analyze quickly the mechanical macroparameter and fulfill surrounding rock classification based on conventional geology survey,the macroparameters of surrounding rock are estimated according to Hoek-Brown failure criterion. The analysis and classification model is presented based on general investigation and indoor test of rock mass. In addition,the estimation software for solving rock mass mechanical parameters is completed with C # to analyze the mechanical macroparameters of surrounding rock. The value of GSI is most sensitive to affect the mechanical macroparameters of surrounding rock shown by sensibility analysis,and the mechanical macroparameters and classification of surrounding rack are conducted with the program in this paper,which may serve to guide the design of Daozhazi Railway Tunnel.