Research on Plugging Technology of Underwater Shield Tunnel During Operation Period

With the development of urban rail transit technology, subways can quickly spread across the country's major first-tier cities. In 2019, Zhengzhou Metro Line 5 was officially put into operation. During its normal operation, due to the complex underground hydrogeological conditions and the reduced blocking efficiency of the segment system, the segment leakage in the section was serious. Under the pressure and corrosion of the external groundwater, the self-waterproofing system and the sealing gasket fail, and the uneven settlement between the segments causes misalignment. The resulting drips, leaks and wet stains affect the safety of the electrical equipment in the tunnel and the normal operation of the train. Therefore, it is necessary to deeply discuss the plugging process at the water seepage site, and propose treatment measures for water leakage at segment joints, segment bolt holes and segment secondary grouting holes. The results show that the modified epoxy resin grouting material can quickly repair the leakage point of shield segment, and can provide a reasonable reference for the treatment of shield tunnel water leakage in the later operating period.