Influence of Deep Shaft Group Construction on Adjacent Tunnel Based on Different Constitutive Models
As a high-risk project,the construction of deep shaft group will inevitably cause surrounding stratum de-formation,which has a negative impact on the adjacent structures.Therefore,considering the influence of deep shaft group construction on adjacent railway tunnel,this paper relies on a shaft project to be built,and establishes a three-di-mensional integrated numerical model of deep shaft group.The stress and deformation of stratum and tunnel induced by deep shaft group construction were studied based on different constitutive models.The results show that with the pro-gress of construction,the surrounding strata and tunnel present uplift firstly and then settlement,while the horizontal de-formation increases gradually.Due to the difference of loading and unloading modulus between HSS/HS model and MC model,the calculation results by the different constitutive models are different.The influence of shaft group construction on strata and tunnel is as follows:Shaft I＞Shaft Ⅱ＞Shaft Ⅲ(Shaft Ⅳ).The location of the maximum deformation of the tunnel is different from that of the stratum,which is due to the spatial distribution of a certain angle between the tunnel and the Y axis and affects the distribution of the extreme deformation of the tunnel.Using MC model,the horizon-tal deformation of the adjacent tunnel caused by deep shaft construction will be overestimated while its settlement will be underestimated.This study can provide useful reference for the construction of similar projects.
group of deep shaftsadjacent railway tunnelHSS/HS modelMC modelstress and deformation
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