摘要
为研究高地应力下抽水蓄能电站圆形导流泄洪隧洞破坏机理,基于缙云抽水蓄能电站工程项目,运用强度折减法将强度安全系数作为定量指标,以位移突变和塑性区分布作为判据对隧洞结构进行稳定性评价。结果表明:在Ⅴ级围岩地段隧洞应采取额外加固措施;随强度折减系数k值逐渐增大,隧洞周围塑性区及隧洞各处最大位移量也随之逐步增大;强度折减法不仅可通过分析隧洞失稳破坏状态和安全系数来评价隧洞稳定性,而且可依据安全系数大小评定隧洞设计的合理性。
In order to study the failure mechanism of circular diversion spillway tunnel of pumped storage power station under high ground stress,based on the Jinyun pumped storage power station project,the strength safety factor is used as a quantitative index by using the strength-reduction method,and the stability of tunnel structure is evaluated by using the displacement mutation and plastic zone distribution as the criteria. The results show that additional reinforcement measures should be taken for tunnels in V-grade surrounding rock sections. With the increase of strength-reduction coefficient k,the plastic zone around the tunnel and the maximum displacement around the tunnel also gradually expand. The strengthreduction method can not only evaluate the stability of the tunnel by analyzing the instability failure state and the safety factor of the tunnel,but also evaluate the rationality of the tunnel design according to the safety factor.
作者
柴生虎
CHAI Shenghu(China Railway 21^(st)Bureau Group 6^(th)Engineering Co.Ltd.,Beijing 101111,China)
出处
《铁道建筑技术》
2021年第8期132-135,166,共5页
Railway Construction Technology
基金
中铁二十一局集团有限公司科研开发项目(18C-5)。
关键词
高地应力
抽水蓄能电站
导流泄洪隧洞
强度折减法
稳定性
high ground stress
pumped storage power station
diversion flood discharge tunnel
strength-reduction method
stability
