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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第11期    总第291期    2018年11月

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文章编号:1672-7207(2018)11-2843-09
水位与进尺及支护时机对富水隧道稳定性的影响
黄戡1,杨伟军1,安永林2,胡文轩2,李依1,傅蕾1,周经伟1,邱朗1

(1. 长沙理工大学 土木工程学院,湖南 长沙,410114;
2. 湖南科技大学 土木工程学院,湖南 湘潭,411201
)

摘 要: 以实际富水隧道为参考背景,通过不同水位、支护、开挖条件建立三维数值模拟,分析富水隧道在不同条件下的稳定性及围岩变形。研究结果表明:地表沉降和开挖面的水平位移均随着水位的上升而增加,并且水位越接近地表,地表沉降和开挖面的水平位移增加得越明显;支护在滞后2.5 m时,相应的拱顶沉降和塑性区与及时支护条件下相差不大,但在支护滞后5.0 m时,拱顶沉降和塑性区域显著增大,并且塑性区向上部围岩蔓延;随着进尺增加,围岩位移与塑性应变增大;随着渗流时间增加,掌子面前方的孔隙水压力逐渐减少,逐渐呈现漏斗状分布。

 

关键词: 富水隧道;水位线;支护;开挖方法

Influence of different water levels, footages and supporting time on the stability of rich water tunnel
HUANG Kan1, YANG Weijun1, AN Yonglin2, HU Wenxuan2, LI Yi1, FU Lei1, ZHOU Jingwei1, QIU Lang1

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Abstract:Based on the actual rich water tunnel, three-dimensional numerical simulation was carried out to analyze the stability and deformation of surrounding rock under different conditions by different water levels, support and excavation conditions. The results show that the surface subsidence and the horizontal displacement of the excavation surface increase with the increase of the water level, and the closer the water level is to the surface, the more obvious the surface subsidence and the horizontal displacement of the excavation surface increase, and the vault settlement and plastic zone have little difference between the case of 2.5 m behind the support and the timely support condition, but in the case of 5.0 m behind the support, the vault settlement and plastic zone increase obviously, and the plastic zone spreads to the upper part of the surrounding rock. The surface subsidence and the plastic zone of excavation surface increase with the increase of the excavation footage. With the increase of seepage time, the pore water pressure in front of tunnel face becomes smaller and smaller, and gradually presents funnel-shaped water pressure distribution.

 

Key words: water rich tunnel; water level; support; excavation method

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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