石灰岩地层下土压平衡盾构机推进速度预测与分析
刘浩1崔建波2杨侠1王清扬3
Prediction and Analysis of Earth Pressure Balance Shield Machine Advancing Speed in Limestone Stratum
LIU Hao1CUI Jianbo2YANG Xia1WANG Qingyang3
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作者信息:1.济南轨道交通集团有限公司，250014，济南
2.中铁十四局集团隧道工程有限公司，250003，济南
3.中南大学机电工程学院，410083，长沙
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Affiliation:1.Jinan Rail Transit Group Co., Ltd., 250014, Jinan, China
2.China Railway 14th Bureau Group Tunnel Engineering Co., Ltd., 250003, Jinan, China
3.College of Mechanical and Electrical Engineering, Central South University, 410083, Changsha, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.040
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］盾构机的推进速度不仅关系到隧道开挖的快慢，对于施工周期与施工成本的预测也具有重要意义，因此需对盾构机的推进速度进行预测和分析。［方法］以济南地铁3号线龙奥站—奥体中心西站区间全断面石灰岩地层为研究对象，收集盾构机掘进数据，采用空推值、异常值剔除及数据去噪等多种方法对数据进行预处理。为了提高预测精度，将数据集划分为训练集和验证集，通过线性回归建立了基于刀盘扭矩、总推进力的推进速度预测模型，并分析了掘进载荷对推进速度的影响规律。［结果及结论］在石灰岩地层下，3组推进速度预测模型的线性回归预测精度均在0.70以上，说明根据刀盘扭矩和总推进力可以正确预测推进速度。土压平衡盾构机在掘进过程中，刀盘转速和推进速度波动均较小，随着刀盘转速增大，刀盘扭矩逐渐减小；刀盘扭矩对推进速度有积极的影响，刀盘扭矩越大，推进速度越大；在同一地层和掘进条件下，由于刀盘挤土作用，仅增加总推进力不利于推进速度的提高，此时需同时增加刀盘转速。
Abstracts:
［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.
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