Cause Analysis of Seepage Disaster in Deep Foundation Pit of Metro Station in Karst Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective In-depth study should be made on the seepage stability during deep foundation pit excavation in water-rich karst stratum in consideration of the water inrush disaster at the side wall or bottom of the pit during excavation construction in water-rich karst areas. Method Based on the deep foundation pit excavation project of Zhongshan Park Station on Foshan Metro Line 3, an in-depth research is conducted on the seepage characteristics of the deep foundation pit and the mechanism of water inrush at the pit bottom. A three dimensional numerical model of foundation pit, soil and karst cave is established, and the equivalent permeability coefficient method is used to make a coupling simulation of the seepage field in karst stratum. Result & Conclusion Through simulation and analysis, the law of water content in karst area of heterogeneous stratum influencing the seepage field and water inrush quantity of the foundation pit is obtained. The evolution characteristics of vertical average hydraulic gradient of the soil at the foundation pit bottom is clarified, and the mechanism of water inrush at the foundation pit bottom in karst area is revealed. The research results can provide reference for the design and construction of deep foundation pit project in water-rich karst area.
Authors and Affiliations
Xiangqiu WANG, Shichao CHEN, Yingping XIAO
Keywords
Related Articles
- EP ID EP744329
- DOI 10.16037/j.1007-869x.2024.09.021
- Views 35
- Downloads 0
Design of Operation Inspection Garage Clearance Height for Metro Vehicle Bases with Overhead Property Development
Objective The development of overhead property in urban rail transit vehicle bases becomes a basic requirement for vehicle base design in many cities such as Shanghai and Beijing. To effectively address the impact of ove...
Influence of Wheel-Rail Contact Point Changes on Force-Measuring Wheelset Measurement and the Compensation Method
［Objective］ During train operation, there is random vibration in the wheelset, which causes position changes of the wheel-rail contact point, thereby affecting the measurement results of the wheel-rail force. To solve...
Development of Automatic Calculation Program for Passenger Flow Assignment in Urban Rail Transit Network Based on VISUM
[Objective] In view of the much repetitive work in the calculation process of passenger flow assignment in urban rail transit network, an automatic calculation program is developed on the basis of the research on the pas...
Analysis of Train Signaling System Safety Distance
[Objective] The current calculation of safety distance in the moving block signaling system does not consider adverse working conditions such as faults and low adhesion coefficients, resulting in poor authenticity and lo...
Analysis on the Performance of New Mountain Gear Rail Train Brake
Objective The maximum slope of the mountain gear rail line can reach 250‰. As the sliding force generated by the component of the gravity is much greater than the maximum friction force between wheel and rail, relying so...