开挖卸荷岩体锚固等效力学参数数值模拟研究

Numerical Simulation Research on Anchoring Equivalent Mechanics Parameter of Excavating Unloading Rock Mass

以某水电站溢洪道开挖卸荷边坡系统锚杆锚固岩体为研究对象,考虑开挖卸荷过程的影响,对一定锚固密度的卸荷岩体其锚固等效力学参数特性进行了比较全面的研究.结果表明,对于同一种岩体,如卸荷程度不同则其锚固等效力学参数也就不同,卸荷程度高,则其锚固等效力学参数提高倍数大,反之则小,从而说明系统锚杆对软岩的加固作用比对硬岩的加固作用好.同时认为系统锚杆对边坡锚固等效力学参数的提高非常有限.

Regarding the bolted rock mass with system anchor bar of the spillway in a certain hydropower station as the object,the paper has made quite comprehensive research on characteristic of equivalent anchoring mechanics parameter of unloading rock mass with certain anchor density,considering the influence of unloading process.The results indicated that for an identical kind of rock mass,the equivalent anchoring mechanics parameter differs with different unloading degrees.A higher unloading degree results a bigger amplifying coefficient of the equivalent anchoring mechanics parameter,otherwise,a smaller.It also explained that system anchor bar impacts more reinforcements on soft rock than hard rock,conversely,the system anchor bar can take extremely limited effects on the advancement of equivalent anchoring mechanics parameter.