卡里巴南岸水电站扩机工程地下厂房围岩稳定数值分析

借助三维辅助设计软件CATIA,建立已建及扩建洞室群整体三维几何模型;采用分块重建方法,解决因地形地质条件复杂引起的洞室群实体单元构建困难的问题。采用有限差分软件FLAC 3D,考虑各扩建洞室布置、开挖支护顺序、运行情况等因素,进行三维仿真分析。掌握地下洞室群的应力以及变形情况,确定地下洞室群的合理开挖顺序和围岩支护参数,评价地下洞室群的安全性和稳定性,并为扩建地下洞室群的设计工作提供依据。

Numerical Analysis on Surrounding Rock Stability of Underground Powerhouse,Extension of Kariba South Bank Hydropower Station

With the help of aid design software CATIA, A whole 3D geometric model of the established and to be extended powerhouse caverns is built.By application of block-re-building method, the model （which is difficult to build due to the complicated topographical and geological conditions） of solid element of the cavern group is rebuilt.Then the 3D simulation analysis is performed by application of the finite difference software of FLAC 3D and in consideration of the factors such as arrangement of the extended caverns, sequences of excavation and support, and operation, etc.The stress and strain of the underground caverns are learnt to finalize the reasonable excava-tion sequence and surrounding-rock support parameters of the underground caverns group, assess the safety and stability of the under-ground caverns, and furthermore to provide the design of the extension of the underground caverns group with theoretical basis.