摘要
向家坝水电站地下厂房跨度33.4m、高85.2m,为国内最大跨度与高度的地下厂房。缓倾角岩层中大跨度地下洞室群的开挖致使顶拱围岩稳定问题突出,为典型结构面控制型地下岩体工程。采取三维离散单元法与应力位移监测相结合的研究对策,对围岩稳定进行综合分析,实施对穿锚索和系统锚杆的加固对策,并基于监测成果说明厂房顶拱围岩在开挖加固后的稳定性。研究表明,浅至中等埋深结构面控制型围岩稳定问题必须加强工程地质分析,重视岩体的非连续性和各向异性,宜采用非连续介质力学分析方法进行分析,以实施针对性加固措施。
The underground powerhouse of Xiangjiaba hydropower station（33.4 m×85.2 m） is the largest underground powerhouse in the world.Excavation of large-span underground caverns in gently inclined stratum leads to significant stability problems of surrounding rock mass.Both 3D distinct element method and stress and displacement monitoring are used to study the surrounding rock mass stability,and two-ended anchor and systematic bolts are used to reinforce the surrounding rock mass.Then,based on the monitoring results,the stability of surrounding rock is analyzed.The research reveals the structure-controlled surrounding rock stability problem of shallow or middle buried cavern,and great attention should be paid to geology analysis and the survey of rock mass geometric features and discontinuity.It is appropriate to use the discontinuous medium mechanics method,and then to implement the corresponding optimal reinforcement measures.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第7期1307-1313,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
层状围岩
监测
稳定性
三维离散元法
rock mechanics
layered rock mass
monitoring
stability
3D distinct element method
