强风化花岗岩隧道二次衬砌支护时机研究

Study on the Timing of the Secondary Lining Support of the Strongly Weathered Granite Tunnel

通过应用RFPA软件分析不同尺寸下强风化花岗岩的岩体变形特性、破坏规律及声发射特征;在隧道开挖过程中通过埋设应力计、位移及声发射仪监测隧道的变化特征,分析开挖过程中岩体应力变化规律、位移变化规律及声发射特性,通过对比数值分析结果,确定了强风化花岗岩的二衬支护时机,并经现场验证,证明了二衬支护时机合理性。

In this paper,RFPA software was used to analyze the deformation characteristics,failure laws and acoustic characteristics of strongly weathered granite under different sizes.In the process of tunnel evacuation,through embedded stress meter,displacement and acoustic emission instrument,the stress and displacement change law,and acoustic characteristics during evacuation were analyzed.By comparing the numerical analysis results,the supporting time of secondary lining of strongly weathered granite were determined,and the rationality of the supporting time of secondary lining was proved by field verification.