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On Ground Reinforcement Measures and Influence on Surrounding Building and Utility Deformation during Enlarging Construction of a Shield Tunnel by CRD Method
(Zhengzhou Metro Group Co., Ltd., Zhengzhou 450000)
Abstract Engineering practice shows that the influence of urban underground structure construction on surrounding environment is one of the main risk sources in engineering construction. In view of this, for the junction section between the link line of Zhengzhou Metro Line 1 and Line 2 and the main line of Line 2 the numerical simulation and field monitoring are carried out to study the relevant control measures and the influence of enlarging construction of a shield tunnel by CRD method on the surrounding environment. The results show that: (1) compared with the other three control measures, using the control measure of advanced small grouting pipe + large pipe roof + radial grouting bolt, the ground settlement, existing pipeline deformation and existing building deformation can meet the specified control requirements, with the best control effect and controllable environmental risks; (2) Enlarging excavation has the greatest influence on ground settlement, accounting for 54.47%~59.39% of the total settlement. The settlement caused by enlarging excavation in the upper left part accounts for 18.31%~18.52% of the total deformation, so the monitoring should be strengthened at this stage.
Abstract：
Engineering practice shows that the influence of urban underground structure construction on surrounding environment is one of the main risk sources in engineering construction. In view of this, for the junction section between the link line of Zhengzhou Metro Line 1 and Line 2 and the main line of Line 2 the numerical simulation and field monitoring are carried out to study the relevant control measures and the influence of enlarging construction of a shield tunnel by CRD method on the surrounding environment. The results show that: (1) compared with the other three control measures, using the control measure of advanced small grouting pipe + large pipe roof + radial grouting bolt, the ground settlement, existing pipeline deformation and existing building deformation can meet the specified control requirements, with the best control effect and controllable environmental risks; (2) Enlarging excavation has the greatest influence on ground settlement, accounting for 54.47%~59.39% of the total settlement. The settlement caused by enlarging excavation in the upper left part accounts for 18.31%~18.52% of the total deformation, so the monitoring should be strengthened at this stage.
FENG Jinghui ZHU Ying
.On Ground Reinforcement Measures and Influence on Surrounding Building and Utility Deformation during Enlarging Construction of a Shield Tunnel by CRD Method[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(5): 204-212
2021, Vol. 58 