Abstract
Shield docking technology is widely used in underwater shield tunnels. As the technology is not perfect, the instability of the tunnel face and the stress relaxation of segment lining caused by shield dismantling need to be solved. Using a cross-sea tunnel project, the segment lining reinforcement technology with steel channel in the process of shield docking is studied. The longitudinal stress relaxation effect of segment lining after thrust unloading is analyzed, and the theoretical solution of segment circumferential joint opening, with or without steel channel reinforcement, is derived. The accuracy of the theoretical model and the shell connector numerical model is verified by comparison. Then, the influence of key parameters, such as reinforcement range, steel channel quantity and steel channel model, on reinforcement effect is discussed. The results show that: (1) with the increase in the range of reinforcement, the maximum longitudinal displacement and the opening of the circumferential joints decrease first and then increase; (2) with the increase in the quantity and model of the steel channel, the maximum longitudinal displacement and the opening of the circumferential joints gradually decrease, and the reduction rate also decreases. The farther away from the shield tail, the weaker the reinforcement effect on segment lining.
Highlights
As for the cross-sea shield tunnel, due to difficulties such as large span, long construction period and complex stratum conditions, the shield docking technology has emerged because of necessity [3]. This technology can greatly shorten the construction period, reduce costs and increase social benefits, which is of great significance for underwater shield tunnel construction [4,5]
According to different construction methods, shield docking technology can be divided into the civil docking method and the mechanical docking method
Some scholars have carried out relevant studies on segment lining structures [7–20] and shield reinforcement technology [21–30]
Summary
With the rapid development of China’s rail transit engineering systems, shield tunneling technology has become more and more perfect, and underwater tunnels have gradually become the norm [1,2]. In the shield machine disassembly process, thrust unloading can cause problems such as instability of the tunneling face, stress relaxation of segment lining and joint leakage. As a new technology for shield tunneling, the theoretical method of shield docking technology is not mature; in particular, the model and theory of longitudinal stress relaxation between segment rings after shield dismantling and thrust unloading are lacking. Sci. 2022, 12, 2831 a new technology for shield tunneling, the theoretical method of shield docking technology is not mature; in particular, the model and theory of longitudinal stress relaxation between segment rings after shield dismantling and thrust unloading are lacking. Figure 3TT.hhSeeimccpaallliccfuiuelldaattsiicoohnnemmmaeeticcchhdaainnaigissrmmamiinnofFFliioggauudrrmee o33diiesslssoiifmmseppglleme aaennntddliccnllieenaagrr,u, aannndddercctahannrubbsteeuuunssloeeadddttioongaa.ccccuu-rrreaaittneTelflhyoyerccccaeaalmlclccuueulnlalaatttteemiottehnhaeesmutthehreceehsoo.arrIenenttiiiscpcmaarllaicvvntaaiFclluuaigeleueoornfefgt3tihhnieeeseoosrpipimneegnnp,iilntnehggarnuaadfsfttteecurrlenttahlhorrr,auuadssnittnduugncnlalelonoaaadbddseiintnuoggstewhwdeiitttehohxooacuuecttscsuaai-nvnyey raotepleyncianlgcuolfatceirtchuemtfheeroernettiiaclajlovinatlsu,ewohficthheleoapdesnitnogwaaftteerrptrhoroufistngunfaloilaudrienagnwdiethvoeunttahneyinstability of the lining structure Longitudinal reinforcement, such as adding a steel channel, is usually carried out on the segment structure before thrust unloading. FItt. iIst icsocnovnevneinenietnttotounudnderesrtsatnanddththeeccoommpplelexxmmeecchhaanniiccaall relationship of the model and derive the theoretical solution of the circumferential joint orpeleantiionngsahfitperotfhtrhuestmuondloealdainndg.derive the theoretical solution of the circumferential joint opening after thrust unloading
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