Analysis on the Influence of Karst Distribution on the Mechanical Characteristic of Shield Tunnel
The karst geology in Shenzhen area is relatively developed,which is mainly manifested as covered karst.It is particularly important to carry out reasonable karst treatment.This paper mainly studies the treatment scheme of karst development area along the shield tunnel.Through calculation,the stress characteristics of the tunnel during construction and operation period when the karst cave is located at the bottom,side and top with different distances are analyzed.The calculation results show that the shield tunnel is mainly affected by the bottom and side karst caves during the construction period,and the karst caves within the range of 5 m on the side,3 m on the top and 10 m at the bottom of the tunnel should be treated.During the operation period,if the karst is not treated,the bottom karst cave has the greatest influence on the tunnel,and the karst cave backfill should be adopted to strengthen the stratum resistance.
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