Experimental Research on Ground Deformation of Double Close-Spaced Tunnel Construction

In this study, we obtain the optimal ratio of similar materials of soil layers by similarity principle and uni-axial compression tests. The two-dimensional similar material model is established for Dalian double-tube parallel tunnels line No.1. The laws of ground deformation for successively construction are obtained by measuring the internal displacement of model. It is shown that the subsidence rate of early period of construction is larger than that of lately period of construction. The vertical settlement rate of shallow stratum is greater than that of deep stratum. The surface subsidence of two tunnels is superimposed. The settlement is larger in the side of early excavating tunnel. The characteristic of non symmetrical two peak of the vertical deformation of stratum is obvious. The horizontal displacement of axis of two tunnels approximately decreases linearly with the increase of the depth. The horizontal displacement in the location of center line and axis of two tunnels is not 0. The obvious shear layer appears in the inner of the soil layers. The pile and shear wall within this range is easy to appear the crack owing to tunneling.

並列關鍵字

Double-tube parallel tunnels ； ground settlement ； model experiment ； shear layer ； the optimal ratio

國際替代計量

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