Optimization Analysis of Temporary Support Demolition of Shallow Excavation Station in Coastal Soil and Rock Stratum
An example was taken from the initial arch cover excavation of a subway station in the coastal area,the finite element numerical simulation method was used to analyze the temporary support demolition scheme that is subsequently verified by the measured data.The result shows that,the maximum settlement of surrounding rock is located at the vault,and the displacement near the arch waist on both sides is smaller than that of the vault,therefore,the surrounding rock has a noticeable convergence.Then,the vertical support connected with the vault is removed,which has a good effect on controlling the settlement of the initial support of the vault,and the connection between the horizontal support and the vertical support can be guaranteed during the demolition process;the optimized demolition scheme considers the construction of the secondary lining,and the lower vertical support adopts the method of interval demolition.At the same time,the secondary lining of the arch foot provides support and protection for the upper surrounding rock of the arch cover,which can control the excessive settlement near the vault.Finally,the monitoring measurement should be strengthened when the support is removed.The field measured data show that,the trend of surface settlement,vault settlement and clearance convergence is relatively stable after the optimized demolition scheme is adopted.
coastal areaupper soft and lower hard stratashallow excavationarch cover methodsupport demolitionmonitoring measurementscheme optimizationsettlement control
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