Study on the Influence of Weak Subgrade Strengthening on the Settlement of Metro Tunnel in Operation
In order to improve the safety of subway tunnel operation,the finite element software ANSYS was used to analyze the influence of the thickness of roadbed reinforcement construction layer,the property of road soil,the elastic modulus of soil and the strength of tunnel lining on the tunnel settlement.The results show that the settlement is the smallest at both ends of the tunnel,and the greater the settlement is near the middle of the tunnel.The maximum settlement amount of the tunnel with 4 layers of soil above the tunnel increased by 20%compared with the unapplied layer.When the soil density is 2 250 kg/m3,the maximum settlement over the tunnel is 2.6%higher than that of 1 850 kg/m3.When the tunnel lining strength is 35 GPa,the maximum settlement above the tunnel is 2.1%higher than that when the tunnel lining strength is 30 GPa.In summary,the larger the soil layer thickness,soil density,soil elastic modulus and tunnel lining strength,the higher the settle-ment in the middle of the tunnel.
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