隧道气囊在外压作用下的变形特性及试验验证
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TU473.5

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国家自然科学基金(41272323、41402263);天津市自然科学基金(13JCZDJC35300)


Model test on deformation characteristics of large diameter airbag in tunnel under external pressure
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    摘要:

    在隧道的建设和运营中,地下水渗漏、突发洪水及有害气体等会对隧道及周围环境造成严重危害,故需快速高效的临时性装置进行阻隔。提出采用大直径气囊将隧道阻隔分区,其原理是通过增大内压使气囊与隧道壁贴合,利用气囊与隧道壁之间的摩阻力来抵抗外部压力,将流体阻隔在气囊一端,避免灾害扩大。充灌气囊属于膜结构,在抵挡外力时,薄膜的受力和变形直接影响气囊滑移失效的模式。结合气囊在隧道中的边界条件和受力条件进行分析,得出自初始状态至阻漏失效的整个过程中气囊形状和内压随外压变化的关系,得到气囊能够抵挡最大外压的计算公式,并确定气囊失效模式的类型,进而探究了气囊长径比和初始压力对形状和内压变化的影响。通过模型试验对理论公式进行验证,试验结果与理论分析有很好的一致性。

    Abstract:

    Tunnel safety has long been a major concern for transportation and government entities. Noxious fumes, deadly gasses, groundwater seepage and flooding threats have occurred in main transportation systems. It is necessary to isolate the water inrush area as soon as possible, to gain time for further treatment. The method of stopping water using large-diameter airbags is quite efficient, and the contact area between the surface of the airbag and the tunnel inner wall will produce frictional force to resist the fluid pressure from expansion of wetting area. This paper assumes that the airbag can't be stretched, and combining with the boundary conditions in the tunnel of the airbag and the stress condition, the deformation and the force characteristics of the airbag under external pressure are studied. Formula of shape change and internal pressure increase of the airbag is obtained, and the relationship between the external and internal pressure is proposed. The control factors for leakage resistance, influence of the aspect ratio, as well as initial pressure on the shape and internal pressure were analyzed. The theoretical formula is verified via the model test, indicating good agreement.

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陈静,闫澍旺,孙立强,贺小青,郎瑞卿.隧道气囊在外压作用下的变形特性及试验验证[J].土木与环境工程学报(中英文),2018,40(5):16-26. Chen Jing, Yan Shuwang, Sun Liqiang, He Xiaoqing, Lang Ruiqing. Model test on deformation characteristics of large diameter airbag in tunnel under external pressure[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2018,40(5):16-26.10.11835/j. issn.1674-4764.2018.05.003

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  • 收稿日期:2017-08-31
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  • 在线发布日期: 2018-08-11
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