Research on the floating remediation measures of metro shield tunnel in limestone stratum
In the process of metro operation,shield section tunnels often face a high risk of floating when they are located in the limestone stratum.To ensure the stability of the section tunnel structure and the operation safety of the metro,it is necessary to effectively control the issue of tunnel floating under the condition of satisfying the safe operation of the metro.By analyzing the characteristics of the limestone stratum and the reasons for the floating of the section in such stratum,on the basis of ensuring that secondary disturbance is not occurred in the existing tunnel,measures such as"water discharge and pressure reduction+segment fixed pile+grouting water-stopping ring hoop partition+grouting filling"are taken on the floating section of the tunnel to fill and reinforce tunnel voids,and auxiliary measures such as"structural monitoring+radar detection behind the wall+tunnel disease monitoring"are taken to guide on-site construction,guaranteeing the remedial work is carried out smoothly and good results are achieved,thereby ensuring the safety of operating tunnels.The relevant research could provide technical support for the treatment of similar tunnel floating issues.
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