Performance Analysis of Slurry After Sewage Infiltration in Pipe Jacking Construction of Subway Station Entrances and Exits Project
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective During pipe jacking construction, aging sewage pipes within the construction area are prone to rupture, leading to sewage infiltration into the thixotropic slurry along the soil body, thus impacting the performance of the thixotropic slurry to some extent. In order to ensure the construction safety, it is necessary to study the change law of performance indicator after sewage infiltration of the thixotropic slurry. Method Using the No. 1 entrance and exit project of Baohua Street Station on Jinan Rail Transit Line 2 as a case study, combined with the construction conditions of the sewage pipe rupture due to the jacking pipe underpass at the entrance and exit of the station, the change law of the thixotropic slurry performance indicators after sewage infiltration is studied, and the sewage infiltration impact on the drag reduction effect of thixotropic slurry is analyzed by drag reduction test. Result & Conclusion After sewage infiltration, the performance of the thixotropic slurry deteriorates, with a reduction in slurry funnel viscosity and a significant increase in water separation rate and water loss. The positive charges of inorganic salts in the sewage and the negative charges of the slurry soil particles attract each other, causing the slurry Zeta potential dropping from a stable 31.0 mV to below 20.0 mV. Sewage infiltration results in a noticeable increase in the mass fraction of large-size soil particles, and aggregation and precipitation of the slurry, this is the reason for the significant increase in slurry water separation rate. Sewage infiltration also leads to the decrease in the slurry drag reduction effect, with an increase in the friction factor and pipe jacking thrust.
Authors and Affiliations
Kun ZHANG, Zheng SHEN, Shaoping LI, Guobin LI, Ying TANG, Dong WANG, Fanlu MIN
Keywords
Related Articles
- EP ID EP744332
- DOI 10.16037/j.1007-869x.2024.09.024
- Views 19
- Downloads 0
Study on Key Protocols of Shanghai Metro B-TrunC Network Interconnection
[Objective] The B-TrunC (broadband trunking communication) network of Shanghai Metro adopts the architecture of multi-line shared hot standby trunking core network, which needs access to the base stations and terminals o...
Application Analysis of CTCS-3 in City Railway
Objective At present, there is still no practical case of using CTCS 3 (Chinese Train Control System Level 3) in city railway in China. The application of CTCS-3 system in city railway should be explored to expand its ap...
Influence Analysis of Suspended Monorail Track Beam on Vehicle Running Stability
Objective Influenced by the track beam, the suspended monorail vehicle is prone to yaw motion during running, which significantly affects the vehicle′s stability. Therefore, it is necessary to analyze the causes of the y...
Cause Analysis and Control Measures for Inaccurate ATO Parking Accuracy of Qingdao Metro Line 13
Objective In order to solve the stop mark exceeding/failing problem of Qingdao Metro Line 13, it is necessary to deeply analyze the control principle of ATO (automatic train operation) parking and the factors affecting i...
Research on Switch Machine Fault Diagnosis Based on Integrated Deep Learning
Objective To make full use of fault log data for diagnosing switch machine faults, a fault diagnosis method based on integrated deep learning is proposed. Method By analyzing the textual data of switch machine faults and...