偏压连拱隧道围岩稳定性分析与现场监控量测

In-Situ Monitoring and Stability Analysis of Surrounding Rock of Joint Arch Tunnels in Partial Pressure

针对偏压连拱隧道围岩稳定性问题,采用GeoStudio软件的SIGMA模块进行数值模拟,以数值模拟的计算结果作为判断围岩稳定性的控制指标,结合现场压力盒进行监控量测,并利用加权回归分析方法对监测数据进行处理,得出各监测点实测围岩稳定压力。通过对数值模拟结果与现场监测数据的对比分析,可知隧道围岩处于稳定状态。结果表明,利用有限元对隧道进行数值模拟和加权回归分析对监测数据进行处理,两种方法相结合对判断偏压连拱隧道围岩稳定性具有很好的效果。

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.