苗坑水库工程引水隧洞稳定性及应力分析

Stability and Stress Analysis of Diversion Tunnel of Miaokeng Reservoir Project

输水隧洞经常发生的病害主要为衬砌裂缝,因此对隧洞裂缝进行分析对维护衬砌结构的稳定性至关重要。以苗坑水库输水工程为例,结合断裂力学理论以及混凝土断裂准则,建立输水隧洞衬砌结构稳定性的安全评价方法。依据计算模型,分析裂缝位置及角度对衬砌结构安全性以及稳定性的影响,最终确定引水隧洞的稳定性和应力条件,以此为隧洞支护提供建议。

The main disease of water conveyance tunnel is lining crack,so it is very important to analyze the tunnel crack to maintain the stability of lining structure.In this paper,taking Miaokeng reservoir water conveyance project as an example,combined with fracture mechanics theory and concrete fracture criterion,the safety evaluation method of water conveyance tunnel lining structure stability is established.According to the calculation model,the influence of the crack position and angle on the safety and stability of the lining structure is analyzed,and the stability and stress conditions of the diversion tunnel are finally determined to recommend the tunnel support required.