Abstract: To study the stability of surrounding rock of joint arch tunnels in partial pressure, the authors introduce SIGMA module of GeoStudio program to simulate it and adopt the calculation result as the guideposts. Pressure cells were installed and monitoring data were treated by the method of weighted regression analysis, which got the steady pressure of the monitoring spots. Contrasting calculation result and monitoring data, it is gotten that the surrounding rock of tunnel is stable. The results indicate that the FEM and weighted regression analysis have a good result for judging the stability of surrounding rock of joint arch tunnels in partial pressure.

Key words: joint arch tunnels in partial pressure, surrounding rock stability, FEM, weighted regression analysis