锚杆加固对石窟地震反应的影响

利用大型通用AD INA有限元分析软件进行动力分析,研究锚杆加固对石窟地震反应的影响。通过对无裂隙无锚杆、有裂隙无锚杆、有裂隙有锚杆和有裂隙有预应力锚杆4种模型的分析,研究了锚杆在石窟岩体加固中的作用。结果表明,锚杆的加固作用是明显的,在有裂隙的部位打入锚杆对石窟整体结构的安全性是有益处的。通过两条地震波作用下石窟的地震反应分析,指出了石窟结构在地震荷载作用下的薄弱部位,计算结果表明地震作用下薄弱部位多数发生在石窟的脚点附近,分析结果可作为石窟抗震设计的参考依据。

The influence of anchor bolt supports on seismic responses of strengthening grottoes

The influence of anchor bolt supports on seismic responses of strengthening grottoes is studied with the engineering soft ADINA. The actions of anchor bolt supporting in grotto rock mass are analyzed by four models, which are the model without fissures and anchor bolts, the model with fissures and no anchor bolts, the model with fissures and anchor bolts and the model with fissures and prestressed anchor bolts. The obtained results are shown that the anchor bolts supports in the fissured rock mass is good to raise the safety of the whole structure of grottoes. The seismic response analysis of grottoes is executed under action of two earthquake waves. The calculated results are indicated that the weak parts of the grottoes often appear nearby the corners of the grottoes. The results can provide useful references for the design and repair of the grottoes.