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- 검색키워드
- 저자 : Ruyong Deng (검색결과 2 건)
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Performance of Slurry TBM Tunnelling in Sandy Cobble Ground – A Case Study in Lanzhou
Shunze Cao,Jian Cui,Yongfang Jia,Ruyong Deng 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
The slurry tunnelling boring machine (TBM) was used to construct the tunnel of the Lanzhou Metro Line 1 undercrossing the Yellow River, China. The ground is characterized by sandy cobble with high cobble content. There are many challenges for slurry TBM tunnelling in sandy cobble ground because the cobble is hard to break and transport. This paper focuses on the performance of slurry TBM tunnelling, summarizes the lessons of shield driving and suggests countermeasures for the cobble breaking and disposal including cutterhead improvement, double pebble crusher and clasts collection tank. The chamber pressure and grouting pressure during the driving process were recorded and compared with the theoretical ground stress. The key parameters including the thrust force of cylinders, advance rate, torque and rotation speed of the cutterhead were recorded and analysed. Field test results show that the surface settlement induced by slurry TBM tunnelling in sandy cobble ground can be well controlled and the longitudinal surface settlement can be predicted by the Attewell formula and modified Attewell formula. This paper provides a good reference for slurry TBM tunnelling in sandy cobble ground.
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Gongyun Xu,Yong Fang,Yubo Wang,Liupan Dou,Ruyong Deng,Fangchuang Geng 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10
Earth pressure balance (EPB) shield excavation in cohesive strata frequently encounters cutterhead clogging, consuming time and economic costs. Engineering practice shows that cutterhead aperture ratio, soil chamber pressure and soil conditioning have important influences on the clogging behavior of EPB shields. In order to study these factors, a series of laboratory tests were conducted using a setup that can closely simulate the shield tunnelling process. The indicators analyzed were excavation speed, torque, specific energy and soil distribution on the cutterhead. The results indicate that cutterhead aperture and cutter arrangement are important factors in clogging potential. Clogging creates a significant reduction in excavation speed. Torque is not a sensitive parameter reflecting clogging because of the effect of the consolidated soil on the cutters. The presence of soil chamber pressure makes it difficult to remove the clogging through the shearing action of the excavation surface. The injection of a sufficient amount of foam can reduce the risk of shield clogging, but it may lead to an increase of soil adhesion on the cutterhead. The amount of soil that adheres to the cutterhead cannot be used as a classification criterion for clogging potential. Based on experimental phenomena and established studies, a mechanical model called ‘beam-bridge’ was proposed to study the behavior of the soil through the cutterhead opening and damage form of clogging. The results will help to the excavation control of EPB shields.
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