纵向裂缝对隧道钢筋混凝土衬砌结构影响的试验

基于荷载 结构模型，开展了钢筋混凝土衬砌的加载试验.通过分析钢筋混凝土衬砌加载过程中结构的变形和裂缝展开规律，获得了纵向裂缝深度与结构转动刚度的关系曲线，提出了单一裂缝情况下钢筋混凝土衬砌的计算模型.该模型根据连接弹簧单元来模拟衬砌裂缝，弹簧单元的参数根据衬砌结构试验结果和理论分析确定.通过该模型得到的承载安全系数可以评价带裂缝衬砌是否需要进一步加固，对实际隧道工程具有指导意义.

Experimental Study on the Effect of Longitudinal Crack on Reinforced Concrete Tunnel Lining

Based on the load-structure model,the structure test of reinforced concrete lining was done to establish the calculation model of reinforced concrete lining with crack.The relation curve of longitudinal crack depth and structure rotational stiffness was obtained through the analysis of deformation and crack development of reinforeced concrete lining in loading process.Exponential function could describe the curve of rapid change phase and stable phase,while parabola function could describe the curve of the accelerated change phase.A calculation model of reinforced concrete lining with one crack was proposed,and the crack was simulated by the connected spring whose parameters are determined through the results of lining structure test and theoretical analysis.The calculated safety factor can be used to evaluate the necessity of the concrete lining’s further strengthening.The proposed model has guiding significance to practical tunnel engineering.