摘要
引水隧洞渐变段位于隧洞进口段,埋深较浅,地质条件较差,其安全稳定问题是工程中的重要课题。针对大岗山水电站引水隧洞进口渐变段,采用三维有限元方法,计算分析施工期围岩开挖稳定问题,以及施工期、运行期、检修期和高水击作用等工况下衬砌的应力分布情况,并针对外水折减系数和围岩力学参数进行敏感性分析。计算结果表明,在开挖过程中洞室围岩能够保持稳定;在高水击作用工况下,衬砌受到最大的拉应力作用,是控制性工况;外水折减系数对衬砌应力分布影响较大。
The transition region is located at the entrance of diversi subjects. 3D finite elements analysis method is applied to the numerical analysis of transition region of diversion tunnel at Dagangshan Hydropower Proiect. The stability analysis of wall rock and the stress analysis of lining under on tunnel. Because shallow burial and poor geological conditions, stability and safety are significant, different working conditions are conducted. A sensitivity analysis is made of reduction of external water pressure and mechani cal parameters of wall rocks. Calculation results show that in the course of construction, wall rocks remain stable. The tensile stress is the biggest under the surge pressure, and it is the dominant working condition for lining design. Reduction of external water pressure produces greater effects on the stress distribution in the tunnel lining.
出处
《中国农村水利水电》
北大核心
2012年第9期120-123,131,共5页
China Rural Water and Hydropower
基金
国家自然科学基金项目(51079108)
关键词
引水隧洞渐变段
围岩稳定
衬砌
应力
数值分析
transition region of diversion tunnel stability of wall rocks lining stress numerical analysis
