Abstract The dual-component synchronous grouting technology for shield tunnels is still immature and faces many
challenges during construction. Therefore, experiments on dual-component grout mix proportions were conducted,recommended performance index values for grouting materials were proposed, new grouting equipment was developed, key construction technical points were summarized, and the technical effectiveness was verified through engineering practice. The results show that sodium silicate mainly provides early strength, while the water-cement ratio mainly affects the later strength. The dual-component grout exhibits good stability and concretion rate. The selection of dual-component grout parameters should be based on factors such as hydrogeological conditions, deformation control requirements, and equipment structure, with the mix ratio adjusted accordingly. Synchronous grouts preparation and storage trolley can avoid the degradation of Component A, and the automatic cleaning function of the grouting system effectively reduces the risk of pipe blockage. The flow monitoring method can reduce mix ratio deviations. The filling coefficient of the dual-component grout can be between 1.2 and 1.3, and the grouting pressure should be greater than the water-soil pressure at the grouting point by 0.05~0.1 MPa. The dual-compnent grout can control the segment uplifting within 5 mm, and the axis deviation within ±50 mm. Ground penetrating radar tests showed that the grout density exceeded 99.93%.
Abstract：
The dual-component synchronous grouting technology for shield tunnels is still immature and faces many
challenges during construction. Therefore, experiments on dual-component grout mix proportions were conducted,recommended performance index values for grouting materials were proposed, new grouting equipment was developed, key construction technical points were summarized, and the technical effectiveness was verified through engineering practice. The results show that sodium silicate mainly provides early strength, while the water-cement ratio mainly affects the later strength. The dual-component grout exhibits good stability and concretion rate. The selection of dual-component grout parameters should be based on factors such as hydrogeological conditions, deformation control requirements, and equipment structure, with the mix ratio adjusted accordingly. Synchronous grouts preparation and storage trolley can avoid the degradation of Component A, and the automatic cleaning function of the grouting system effectively reduces the risk of pipe blockage. The flow monitoring method can reduce mix ratio deviations. The filling coefficient of the dual-component grout can be between 1.2 and 1.3, and the grouting pressure should be greater than the water-soil pressure at the grouting point by 0.05~0.1 MPa. The dual-compnent grout can control the segment uplifting within 5 mm, and the axis deviation within ±50 mm. Ground penetrating radar tests showed that the grout density exceeded 99.93%.
YAO Zhanhu1 YANG Qin2 LI Hui2 WEI Daiwei2 MENG Jia2
.Study and Application of Dual-component Synchronous Grouting Technology
in Shield Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(2): 265-273
2025, Vol. 62 