Analysis and prediction of TBM disc cutter wear when tunneling in hard rock strata: A case study of a metro tunnel excavation in Shenzhen, China

Su, Weilin; Li, Xinggao; Jin, Dalong; Yang, Yi; Qin, Ruicheng; Wang, Xuyang

doi:10.1016/j.wear.2020.203190

Cited by 41 publications

(10 citation statements)

References 17 publications

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“…Shield construction is an advanced tunnel construction method in soft soil, which is widely used in subway tunnels [1,2], water conservancy tunnels [3,4] and highway tunnels [5]. During construction, the shield machine pushes forward on the assembled segments and assembles new segment rings under the support of the tail shield, and the assembled segment rings form the final tunnel [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm-Based Intelligent Selection Method of Universal Shield Segment Assembly Points

Liu

Zhang

et al. 2022

Applied Sciences

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The proportion of universal segment in tunnel construction is constantly increasing. A key factor affecting the quality of tunnel construction is the selection of the shield segment assembly points. Nevertheless, the quality and efficiency of the current manual selection method cannot be guaranteed. To realize a high correct rate, high efficiency and intelligence of universal segment assembly points selection, an intelligent selection method of assembly points is proposed. First, the objective function is established by considering the thrust cylinder stroke and shield tail gap differences. Second, to adaptively optimize the weights of the objective function, the working conditions are divided into 81 intervals, and a genetic algorithm is proposed to optimize weights in each interval. Third, a Monte-Carlo-based method is proposed to generate an example dataset, which is used for the genetic algorithm to optimize the weights. Finally, the proposed method was applied to the segment assembly points selection for Line 8 of the Zhengzhou rail transit in China. The results show that the method of assembly segment selection can reach a 90.6% correct rate in the field. The research results of this paper can be used for the selection of the universal shield segment assembly points.

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Section: Introductionmentioning

confidence: 99%

Genetic Algorithm-Based Intelligent Selection Method of Universal Shield Segment Assembly Points

Liu

Zhang

et al. 2022

Applied Sciences

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“…e calculation speed is fast, and the prediction effect is good. During the advancement process in the Shenzhen hard rock formation, the influences of geological indicators such as uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and Cerchar abrasivity index (CAI), as well as the advancement rate and rotation speed on tool wear, are analyzed [27], which provides a reference for rate prediction.…”

Section: Introductionmentioning

confidence: 99%

Research on the Prediction Model of Shield Advancement Rate in Sandy Cobble Ground of Beijing

Li²,

Yang

et al. 2021

Advances in Civil Engineering

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The long distance and tight construction period of the earth pressure balance shield tunneling in Beijing sandy cobble ground have a very positive impact on grasping the construction progress and improving the organization efficiency. Based on the real-time monitoring data of on-site earth pressure, cutter head speed, total thrust, screw conveyor speed, and cutter head torque, this study investigated the correlation between the shield advancement rate and the above parameters based on multiple nonlinear regression analysis method, which lay down the foundation of shield advancement rate prediction. The prediction model achieved satisfactory results and was further applied to an airport project. The results show that it is of guiding significance to use multiple regression method to establish shield prediction model and put forward the best advancement parameters to ensure the construction progress. The order in which the four operational parameters affect the advancement rate is total thrust, cutter head torque, screw conveyor speed, and cutter head speed. When the advancement time is greater than 57 min, the average advancement rate and daily progress are highly positively correlated. The research provides a reliable basis for the advancement rate prediction, safety control, and parameter optimization of shield advancement in similar ground.

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“…This method is repeated at least five times in directions parallel and perpendicular to the original scratching direction on the rock surface using a new or resharpened steel pin tip each time. The CAI is then determined by measuring the diameter of the worn flat pin at an accuracy of 0.01 mm, and calculated by multiplying this diameter in units of 0.01 mm by 10.…”

Section: Introductionmentioning

confidence: 99%

“…Geng et al [9] investigated the effect of the cutterhead design of TBM face cutters on cutter consumption based on the data from six projects. Su et al [10] developed a wear model for analysing disc cutters based on the wear mechanism and motion analysis of the cutter rings. They found that the cumulative wear depth and advance distance are correlated linearly.…”

Section: Introductionmentioning

confidence: 99%

“…Relationship between the CAI values and the wear coefficient. Empirical equations for the wear coefficient relationship with the CAI values are recommended as follows: wc [mm/km] = 1 50.054 − 7.03CAI for center cutter (7) wc [mm/km] = 1 74.589 − 8.432CAI for face cutter (8) wc [mm/km] = 1 54.303 − 5.673CAI for transition cutter (9) wc [mm/km] = 1 57.754 − 7.915CAIfor gage cutter(10)…”

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confidence: 99%

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Effect of Rock Abrasiveness on Wear of Shield Tunnelling in Bukit Timah Granite

Lee

2020

Applied Sciences

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The abrasiveness of rocks significantly influences the wear endured by excavation tools in tunnel boring machines (TBMs). In slurry shield TBMs, wear occurs not only in excavation tools but also in discharge pipes and pumps of slurry transport systems. To explore this phenomenon, this study investigated the effect of rock abrasiveness on the wear of both disc cutters and slurry discharge pipes in slurry shield TBMs. The radial wear of disc cutters and the thickness of slurry discharge pipes were measured and monitored at a TBM site in Singapore. The relationship between the weathering grade of Bukit Timah granite and the wear coefficient of disc cutters was analysed, and a correlation between the Cerchar Abrasivity Index values and the wear coefficient of 19 inch disc cutters was suggested. Additionally, the average wear rates of slurry discharge pipes used for Bukit Timah granite were determined based on the pipe thickness measurements. The wear rates of weathering grades G(I) to G(IV) of Bukit Timah granite were observed to be highly similar to each other, whereas the wear rates of G(V) grade and mixed ground were 1.55 times higher than those of the G(I) to G(IV) grades. The correlation between the slurry discharge velocity and the wear rate in slurry discharge pipes was thus derived. The accurate assessment of the effect of rock abrasiveness on both the wear of disc cutters and the wear rate in slurry discharge pipes, investigated in this paper, will highlight the need for efficient maintenance of the excavation tools in TBMs and encourage the development of various equipment wear prevention measures in order to minimize overall construction costs and time.

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Analysis and prediction of TBM disc cutter wear when tunneling in hard rock strata: A case study of a metro tunnel excavation in Shenzhen, China

Cited by 41 publications

References 17 publications

Genetic Algorithm-Based Intelligent Selection Method of Universal Shield Segment Assembly Points

Genetic Algorithm-Based Intelligent Selection Method of Universal Shield Segment Assembly Points

Research on the Prediction Model of Shield Advancement Rate in Sandy Cobble Ground of Beijing

Effect of Rock Abrasiveness on Wear of Shield Tunnelling in Bukit Timah Granite

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