摘要
本文在分析前人研究锚杆加固机理的拉拔试验和直剪试验的成果基础上,根据锚杆加固弱面的力学特性,提出了附加刚度和附加强度的概念。建立了反映锚杆销钉机理的弹簧支承三维弹塑性有限元计算模型。应用计算模型对加锚试块的直剪试验进行了模拟计算,并将有限元计算结果与试验结果相比较,结果符合得很好。最后将其应用到某抽水蓄能电站地下厂房西端墙支护的实际工程中,取得了满意的成果。
Based on the results of rockbolt tension and shear test,this paper presents the concepts of the appendent stiffness and the appendent strength resulted from the restraint between rockbolts and rockmass.The rockbolt model with the spring-end restraints is set up with the 3-D elasto-plastic FEM to reflect the bolting mechanism of rockbolts.The model is proved to be acceptable by comparing the results of the calculation using this model with the results of shear tests on a bolted specimen.As an application,the reinforcement of the west-end-wall of a under ground house in a pumped-storage power station is calculated with this model.
关键词
岩石
锚杆
销钉
有限元
弹性分析
appendent stiffness
appendent strength
FEM
rockbolts
