安平隧道顶端溶洞对其围岩稳定性的影响
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U455.6

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The influence of hidden karst cave at the top of An-ping tunnel on the stability of surrounding rock in karst area
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    摘要:

    以湖南省龙塘至琅塘高速公路中安平隧道的具体设计、施工及地质情况为背景,采用 Abaqus CAE 2016 有限元软件,模拟安平隧道的施工过程。通过对比隧道顶部不同尺寸的溶洞对隧道拱顶、拱侧的围岩应力和位移 的影响,绘制了不同尺寸的溶洞引起的隧道围岩应力场和位移场的变化图,分析了岩溶区隧道中溶洞引起的隧道 周围围岩变化规律。研究结果表明:在一定范围内,既有顶部隐伏溶洞尺寸的增加将引起隧道位移的增加和隧道 围岩拉应力的增加。该结果可为岩溶区的隧道建设安全提供技术支持。

    Abstract:

    Taking the specific design of construction and geological conditions of An-ping tunnel in Long-tang to Lang-tang highways in Hunan Province as the background, the construction process of An-ping Tunnel excavated by CD method is simulated by using finite element software Abaqus CAE 2016. Comparing the influence of different size karst caves on the stress and displacement of surrounding rock around the tunnel vault and arch side, the variation diagram of the stress field and displacement field of surrounding rock caused by karst caves of different sizes is drawn, and the variation law of surrounding rock caused by karst caves in tunnel in karst area is analyzed. The results show that the increase of the size of the existing top concealed karst cave in a certain range will lead to the increase of the tunnel displacement and the increase of the tensile stress of the surrounding rock. The results can provide technical support for the construction of tunnels in karst areas.

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  • 在线发布日期: 2022-06-09
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