摘要
金坪引水隧洞埋深较大,部分洞段岩体强度较低,洞室开挖后由于二次应力的作用围岩有可能产生变形,因此合理的评价隧洞围岩变形稳定性问题具有重要的工程意义。鉴于此,文章针对金坪引水隧洞围岩变形稳定性问题,对隧洞在大埋深环境下的围岩应力分布特征进行了数值模拟分析,利用与围岩的应变率和岩体抗压强度相关的两种评价方法,分析了可能发生围岩变形的部位和洞段,对引水隧洞围岩变形稳定性做出了综合评价。
Secondary stress after excavation could result in deformation of the surrounding rock at Jinping hydropower plant because of deep embedment of the aqueduct tunnel and low compression strength of rock. Therefore, it is an important to appropriately evaluate stability of the deformed surrounding rock. This paper presents a numerical model for evaluating stress state and stability of the deformed surrounding rock under an embedment at a great depth. Two methods： one related to strain ratio and the other related to compression strength, were used to determine locations of deformed surrounding rock and overall stability of the surrounding rock.
出处
《工程地质学报》
CSCD
2005年第4期461-464,共4页
Journal of Engineering Geology
基金
国家自然科学基金资助项目(编号40372127)
关键词
引水隧洞
围岩变形
有限元
应变率
Aqueduct tunnel, Deformed surrounding rock, Finite element, Strain ratio
