三峡船闸高边坡损伤流变研究及实测分析

RHEOLOGIC DAMAGE STUDY OF THREE GORGES SHIPLOCK HIGHSLOPE AND ANALYSIS ON IN SITU MEASURED DEFORMATION

采用扫描电镜即时记录了裂纹尖端的微裂纹发育和演化过程， 并应用双扭试件测试了三峡船闸花岗岩的亚临界裂纹扩展。推导出压应力状态下， 考虑亚临界裂纹扩展时， 裂纹流变断裂扩展的计算公式； 考虑了裂纹之间的相互作用。运用损伤力学中的平均场模量的概念， 将流变裂纹扩展推广到多裂隙岩体中去， 建立裂隙岩体损伤流变断裂扩展的力学模型。根据此模型， 采用有限元方法进行了三峡船闸高边坡损伤流变断裂分析， 并与实测值做了比较。

SEM tests and double torsion tests are made for the granite samples from Three Gorges Shiplock. The propagation of subcritical fracture is observed and analysed. Based on these tests, a subcritical fracture deformation model is developed and by using it, a FEM analysis is executed. It is conducted that the time dependent deformation is originated from microfractures and sliding points behavior. The analysis results show that the greater part of deformation will be finished within a year and the shiplock is in a stable state.