Influencing Factors and Control Effects of Targeted Grouting Technology for Underground-excavated Metro Station Construction
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 1
Abstract
[Objective] In conventional grouting construction technology, the ineffective diffusion of grout is comparatively severe and leads to unsatisfactory reinforcement effects on surrounding rock and soil mass. Therefore, it is essential to investigate the application of targeted grouting technology in metro station and tunnel pre-grouting construction. [Method] The reinforcement mechanism of targeted grouting technology is expounded. Based on the rheological equation of dual-fluid grout and the theory of uniform capillary groups, the influencing factors of targeted grouting technology are analyzed, and the calculation formulas for the diffusion radius and grout pressure during the cylindrical permeation diffusion of dual-fluid grout are derived. These theoretical formulas are applied to the pre-grouting construction of a metro station to verify the effectiveness. [Result & Conclusion] Targeted grouting technology combines pressure grouting and permeation grouting, ensuring grouting effectiveness while saving material and protecting the surrounding environment. Parameter analysis indicates that the grout diffusion radius is significantly affected by groundwater pressure, grout flow speed, the viscosity parameters A and B of the dual-fluid grout. Within the assumed parameter change ranges, the variation law of the grout diffusion radius is well reflected. The field-monitored data shows that the entire pre-grouting construction process does not cause land uplift or environmental pollution, the grouting reinforcement effect meets the safety excavation requirements, and the expected results are achieved.
Authors and Affiliations
Lijuan ZHA
Keywords
Related Articles
- EP ID EP727712
- DOI 10.16037/j.1007-869x.2024.01.029
- Views 55
- Downloads 0
Simulation Analysis of A Metro Station Construction in Shenzhen with Small TBM Advancing Excavation Followed by Large TBM Enlargement
[Objective] The new technique of small-diameter TBM (tunnel boring machine) advancing excavations followed by large-diameter TBM enlargement is used for the first time in the construction of Tumor Hospital Station on She...
Research on Application of Photothermal Imaging Technology in Urban Rail Transit Vehicle Intelligent Operation and Maintenance
［Objective］ At present, the lack of monitoring means for the operation status of key components such as axle boxes, gearboxes, and traction motors in the daily operation of urban rail transit trains, makes it impossibl...
Maintenance Strategy Optimization of Urban Rail Transit OCS Based on Intelligent Operation and Maintenance
Objective With the development of the intelligence technology and the building of intelligent operation and maintenance platform for urban rail transit overhead catenary/collector system （OCS）, the operation and mainte...
Design and Implementation of Open Smart Training Center for Urban Rail Transit Vehicles
［Objective］ Existing training centers are generally accessible to students only during scheduled class hours. To ensure sufficient hands-on practice time for students to develop their skills, assisting them in building...
Empirical Analysis of Ultra-peak Coefficient of Inbound Passenger Flow in Guangzhou Metro Station
[Objective] Ultra-peak passenger flow is an important parameter for designing the capacity of various parts in urban rail transit station, which is obtained by multiplying the peak-hour passenger flow by the ultra-peak c...