溶洞对隧道结构变形与受力特征的影响研究——以大方隧道为例
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U451.2

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中国中铁股份有限公司科技开发计划(2017-重点-19-2),中铁十五局集团科技研发计划项目(编号:B10)。


Study on Influence of Karst Cave on Tunnel Structure Deformation and Stress Characteristics
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    摘要:

    为探究溶洞对隧道结构变形与受力特征的影响,采用数值模拟方法,通过改变溶洞分布位置、尺寸大小以及与隧道结构净距等不同因素,建立了二维有限元模型,分析了溶洞对隧道结构位移与内力的影响。结果表明:溶洞使隧道结构变形与受力发生了改变,伴随溶洞与隧道距离的增大,隧道结构产生的位移逐渐减小,在同一净距下,随溶洞尺寸增大隧道结构位移逐渐增大,与无溶洞工况对比,溶洞使得隧道结构内力发生了重新分布,在靠近溶洞一侧隧道结构变形与内力均较大。当溶洞直径小于0.4倍隧道尺寸时,溶洞对隧道结构变形与内力影响均较弱,当溶洞直径大于0.6倍隧道尺寸,且与隧道净距小于0.3倍隧道尺寸时,溶洞对隧道结构变形与内力影响显著,最后通过对比分析,得出对隧道稳定性最不利的溶洞位置是隧道侧部溶洞。研究成果可为岩溶隧道设计施工提供科学参考和借鉴。

    Abstract:

    In order to explore the influence of karst cave on the deformation and stress characteristics of the tunnel structure, based on numerical simulation method, two-dimensional finite element model was established by changing the location, size and net distance of the tunnel,the displacement and internal force of the tunnel structure was analyzed. The results showed that the cave changed the deformation and stress of the tunnel structure. As the distance between the cave and the tunnel increases, the displacement of the tunnel structure gradually becomes smaller. Under the same clearance, the displacement of the tunnel structure increases with the increase of the size of the cave. Compared with the non-dissolved hole working conditions, the karst cave caused the internal force of the tunnel structure to be redistributed. The deformation and internal force of the tunnel structure on the side close to the karst cave were larger. When the diameter of the cave is less than 0.4 times the tunnel size, the influence of the cave on the deformation and internal force of the tunnel is weak. When the diameter of the cave was greater than 0.6 times the tunnel size and the tunnel distance was less than 0.3 times the tunnel size, the cave has a significant influence on the deformation and internal force of the tunnel structure, this area was a construction danger zone. Finally, through comparative analysis, it was concluded that the most unfavorable cave location for tunnel stability was the tunnel side cave. The research results can provide scientific reference and reference for the design and construction of karst tunnels.

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郭瑞,黎晨,郑波,等. 溶洞对隧道结构变形与受力特征的影响研究——以大方隧道为例[J]. 科学技术与工程, 2020, 20(9): 3770-3777.
Guo Rui, Li Chen, Zheng Bo, et al. Study on Influence of Karst Cave on Tunnel Structure Deformation and Stress Characteristics[J]. Science Technology and Engineering,2020,20(9):3770-3777.

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历史
  • 收稿日期:2019-06-28
  • 最后修改日期:2020-01-02
  • 录用日期:2019-09-26
  • 在线发布日期: 2020-05-14
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