首页> 中文期刊>地震工程学报 >隧道在地裂缝处的沥青混凝土复合衬砌的力学响应分析

隧道在地裂缝处的沥青混凝土复合衬砌的力学响应分析

     

摘要

针对隧道分缝衬砌结构为适应地裂缝错动造成位移变形而采用的流变性沥青混凝土复合衬砌置于初次衬砌和永久衬砌之间,改善隧道受力条件,以及沥青混凝土密封变形缝防止隧道渗漏的新型技术,应用有限差分数值方法,模拟隧道围岩土层结构及土材料的弹塑性、开挖支护施工过程、复合衬砌沥青混凝土的弹粘塑性、地裂缝两侧上、下盘土层相对错动位移变化,进行了地裂缝隧道永久衬砌结构分缝支护、初次衬砌和永久衬砌中间复合无缝沥青混凝土衬砌的力学响应特性分析.结果表明沥青混凝土复合衬砌能够抑制地裂缝错动位移条件下永久分缝衬砌段的水平位移和旋转位移,其流变变形调整和改善了永久分缝内衬的受力状态,减小了地裂缝附近衬砌结构的集中受拉受压作用.%In order to avoid the destroy of segmented lining structure caused by displacement of ground fissures in the tunnel of Xi an metro, a new technology which use the creeping asphalt concrete composite lining between the initial lining and the permanent lining is adopted at the position of ground fissures. In this paper, using the 3D finite difference numerical method, the structure of soil mass, the elastic-plastic deformation property of soils, the construction process of excavation and lining support, the visco-elastic-plastic property of the asphalt concrete lining and the relative displacement between both blocks of ground fissure are simulated. The mechanics behaviors of the tunnel at ground fissure area with and without the composite asphalt concrete lining structure are analyzed. The results shows that the horizontal displacement of segmented inner lining structure become smaller, the tension and compression action forced on the segmented lining are reduced, because the creep deformation of the asphalt concrete lining adjusts and improves the stress state of the lining structure.

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