Experimental study on construction mechanical behavior of shallow-buried concealed intersecting tunnel
In order to improve the stress form and deformation characteristics of the shallow-buried concealed intersecting tunnel during the construction process,based on a subway project in Qingdao,the lining model was poured according to the geological conditions of the selected subway station and the characteristics of the lining structure,and the similar materials of the surrounding rock were prepared.The model test was used to study the mechanical behavior of the air duct and the main body of the station during the excavation process using the full-section method in the grade-Ⅴ surrounding rock environment.The mechanical behavior of the full-section excavation of the shallow-buried concealed intersecting tunnel was analyzed from two aspects:the deformation of the tunnel lining structure and the internal displacement of the stratum.The results show that for the tunnel structure at the intersecting position,the existing tunnel structure will change the maximum strain and its position of the lining structure of the subsequent construction tunnel.The surrounding rock in different quadrants near the cross-intersecting tunnel structure is in the horizontal deformation accumulation zone and the reciprocating zone respectively.The maximum vertical deformation point of the surface is located above the station of the subsequent construction and has a certain distance from the intersection position,while the vertical deformation value of the surface at the intersection position is slightly smaller.The model test clarifies the deformation characteristics of the surrounding rock and lining structure during the construction of the intersecting tunnel,and gives the temporal and spatial relationship between the maximum surface deformation of the tunnel structure and the construction sequence.The research results can provide a basis for the construction and design of related intersecting tunnel structures.
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