Prediction of TBM cutter wear in heterogeneous ground under high ambient pressure

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Nan Zhang , Shui-Long Shen
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引用次数: 0

Abstract

To prevent tunnel face collapse in heterogeneous ground, the applied face pressure in the excavation chamber can be increased to stabilise the tunnel face, which may hinder cutter rotation during tunnel boring machine (TBM) tunnelling. This study proposes a TBM cutter wear prediction model that considers the impact of the variation in the cutter normal force on the cutterhead owing to the high applied face pressure and low penetration rate. First, the cutter motion mode in heterogeneous ground is investigated. The cutter is found to slide when cutting soft rock based on an analysis of the field data. The evolution process of the cutter wear morphology under heterogeneous ground conditions is summarised. A method for calculating the cutter normal force when the cutter slides on the tunnel face is proposed by referring to the cutting mechanism of the drag bits. The cutter hardness is measured on-site using a portable hardness tester. A semi-empirical model considering the variation in the cutter normal force on the cutterhead is proposed to predict the cutter wear in heterogeneous ground. Wear prediction is compared with other predictive models and field data for validation, and the discrepancies between the different models are discussed. The results show that the proposed model is effective for predicting TBM cutter wear under complex geological conditions.

Abstract Image

高环境压力下异质地层中隧道挖掘机铣刀磨损预测
为防止异质地层中的隧道工作面坍塌,可增加挖掘室中的工作面压力以稳定隧道工作面,但这可能会阻碍隧道掘进机(TBM)在隧道掘进过程中的铣挖机旋转。本研究提出了一种 TBM 刀盘磨损预测模型,该模型考虑了高施加工作面压力和低贯入率导致的刀盘法向力变化对刀盘的影响。首先,研究了铣挖机在异质地层中的运动模式。根据对现场数据的分析,发现铣挖机在铣挖软岩时会发生滑动。总结了异质地层条件下铣挖机磨损形态的演变过程。参照拖曳钻头的切割机制,提出了一种计算铣挖机在隧道面上滑动时铣挖机法向力的方法。使用便携式硬度计现场测量了铣挖机的硬度。考虑到刀盘上刀盘法向力的变化,提出了一个半经验模型来预测异质地层中的刀盘磨损。磨损预测与其他预测模型和现场数据进行了比较验证,并讨论了不同模型之间的差异。结果表明,所提出的模型可有效预测复杂地质条件下的 TBM 刀盘磨损。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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