生态敏感区隧道结构安全计算方法研究

Research on Calculation Method of Structure Safety in Ecological Sensitive Area

为了准确计算衬砌结构稳定性,建立地层结构模型分析复合衬砌注浆后外水压力的分布,将外水压力简化为梯形荷载准确施加在衬砌荷载结构模型中.根据规范进行的结构稳定性验算表明,六盘山隧道注浆堵水后,衬砌结构各位置安全系数K均大于2,满足安全性要求,在保证结构安全的同时达到了控制隧道排水量的作用.

In order to accurately calculate the stability of lining structure,a stratum structure model is established to analyze the distribution of external water pressure about the composite lining after grouting,and the external water pressure is accurately applied on the lining structure model by simplifying the trapezoidal load.Stability checking computations according to the specification show that,after grouting for stopping up water in Liupanshan tunnel,the safety factor Kof lining structure is greater than 2,which meets to the safety requirements.The method can control tunnel displacement and ensure the safety of the structure.