Prediction and Analysis of Earth Pressure Balance Shield Machine Advancing Speed in Limestone Stratum
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 8
Abstract
Objective The advancing speed of shield machine is crucial not only for the tunnel excavation pace but also for the predicting construction schedule and cost. Therefore, it is necessary to predict and analyze the advancing speed of the shield machine. Method Taking the full-section limestone stratum of Longao Station-Olympic Sports Center West Station interval on Jinan Metro Line 3 as research object, data from shield machine excavation are collected and preprocessed using methods such as zero-push value, outlier removal, and data denoising. To improve prediction accuracy, the dataset is divided into training and validation sets. A model for predicting thrust speed is established from linear regression based on cutterhead torque and total thrust, and the influence law of excavation load on advancing speed is analyzed. Result & Conclusion In limestone stratum, the linear regression prediction accuracy of three advancing speed prediction models all exceeds 0.70, indicating that advancing speed can be accurately predicted based on cutterhead torque and total thrust. During excavation with the earth pressure balance shield machine, fluctuations in cutterhead rotation speed and advancing speed are minimal. As the cutterhead rotation speed increases, the cutterhead torque gradually decreases. Cutterhead torque positively influences the advancing speed; the greater the cutterhead torque, the higher the advancing speed. Under the same stratum and excavation conditions, due to the soil extrusion action of cutterhead, merely increasing the total thrust is not conducive to improving advancing speed, calling for the necessity of simultaneously increasing cutterhead rotation speed.
Authors and Affiliations
Hao LIU, Jianbo CUI, Xia YANG, Qingyang WANG
Keywords
Related Articles
- EP ID EP742711
- DOI 10.16037/j.1007-869x.2024.08.040
- Views 51
- Downloads 0
Bogie Bracket Random Vibration Simulation Analysis and Structural Improvement Based on Field-measured Spectrum
Objective It is aimed to investigate the fatigue damage of an antenna bracket structure installed at urban rail transit vehicle bogie frame end under random vibration excitation, and improvement measures are proposed. Me...
Cracking Faults in Grounding Terminals of a Specific Metro Train Model
［Objective］ Frequent cracking faults are observed in the grounding terminals of a specific metro train model during operation. Therefore, it is essential to analyze the grounding terminal cracking causes of the train i...
Compatible Access of Multi-source Citizen Cards in Suzhou Urban Rail Transit Ticketing System
Objective To address the compatible access issue of other types of citizen card and ticket in ticketing system during urban rail transit operation, a unified planning on the compatible access of citizen cards within Suzh...
Analysis of Tunnel Face Stability Based on Upper Bound Method of Limit Analysis
［Objective］ During tunnel excavation, the reformation of a free surface ahead of the tunnel face due to soil removal necessitates the application of appropriate support pressure to ensure soil stability. Thus, it is ne...
Stability Analysis of Jinan Qixiuchang Metro Station during the Foundation Pit Temporary Supports Dismantling
Objective It is prone to lose stability, affecting the engineering safety in the process of dismantling the supports for metro station deep and large foundation pit. Therefore, it is necessary to analyze the stability in...