Experimental study on the failure risk of existing metro station under unilateral large-scale excavation.

In turn, shallow stratum soils on the active side are separated from the station wall and become loose, then the earth pressure is released and shows a decreasing trend.

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The foot of the wall is squeezed to the active side when the station structure is inclined, thus forming a squeezed area, and the compressed earth pressure of the deep stratum shows an increasing trend (see Fig. 18 (a)).

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