Sonar Detection and Comprehensive Treatment of Water Inrush Disaster for Metro Station Deep Foundation Pit in Complex Karst Strata
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 6
Abstract
Objective In Foshan Area, due to the specific characteristics of the complex karst stratum, the calcareous siltstone stratum and the fracture zone can easily cause water inrush disaster in metro station foundation pit. Therefore, it is necessary to adopt sonar technology for detection and solve the water inrush problem through comprehensive treatment. Method Taking Zhongshan Park Station of Foshan Metro Line 3 as the research object, the sonar detection scheme for the station is introduced, the groundwater leakage characteristics of the station deep foundation pit are analyzed based on the detection results, the spatial distribution of leakage points and the type of the water inrush disaster are determined. Based on the results of advanced drilling exploration at the bottom of the foundation pit, and the distribution characteristics of the water inrush points in the foundation pit, a joint sealing scheme for leakage in the foundation pit is proposed, including a retreating double liquid grouting waterproofing curtain outside the pit and a pit interlocking rotary jet grouting pile. The key construction techniques of the retreating double liquid grouting, interlocking rotary jet grouting pile and MJS (metro jet system) pile are emphatically described. The groundwater leakage speeds at representative test holes before and after comprehensive treatment are compared to verify the treatment effect. Result & Conclusion The sonar detection technology can accurately detect the specific spots of the deep foundation pit water leakage points in karst stratum and the relevant parameters of the seepage field. The adopted joint sealing scheme of double liquid grouting, double pipe rotary jet interlocking pile and MJS pile can effectively solve the technical problem of large-scale water inrush and leakage in deep foundation pit excavation in complex karst area.
Authors and Affiliations
Yunjun QIU, Shuang ZHENG, Dong WEI, Shiyang FENG, Xiangqiu WANG
Keywords
Related Articles
- EP ID EP737750
- DOI 10.16037/j.1007-869x.2024.06.021
- Views 46
- Downloads 0
Influence of Brake Device Push-out Stiffness on Vibration Performance of Rail Transit Vehicle
Objective As a braking mode,electromechanical brake adopts the motor controlled screw rod drive to implement the pushing action, making the brake shoe to contact with the wheel and complete the transmission of brake forc...
Research on Control Efficiency of Electromagnetic Linear Eddy Current Braking Device for Medium-low Speed Maglev Trains
Objective Linear eddy current braking device is one of the key technologies for maglev trains, but this technology is still not mature enough. It is of great theoretical significance and application value to study the ed...
Impact of Large-span Civil Defense Tunnel Project Under-passing Construction on Structural Stability of Existing Metro Tunnel Intervals
Objective To analyze the construction impact of new large-span civil defense tunnel on metro tunnel interval structural stability when under-passing existing metro line with a small clear distance, it is necessary to con...
Electromagnetic Field Analysis of Dual-power Traction Power Supply System in Rail Transit Depot under AC-DC Switching Power Supply Mode
Objective The AC-DC (alternating current-direct current) dual-power traction power supply system depot features densely distributed tracks and relatively close catenary clearance. Different power supply modes can affect...
Flood Control Design and Monitoring Schemes for Urban Rail Transit Vehicle Base
[Objective] Flood control in urban rail transit vehicle base affects its safety and the main line operation. To effectively improve the flood control capacity of the vehicle base, it is necessary to study the key points...