Study on the influence of joint dip angle and spacing on rock fragmentation by TBM double disc cutters

• Autorzy: Kang Yiqiang , Yang Renshu , Yang Liyun , Li Yougliang , Yao Man , Gu Shirui
• Języki publikacji: EN

Abstrakty

EN

Tunnel boring machines’ construction efficiency is significantly affected by the formation of joints. Indentation tests were performed to explore the influence of joints on rock fragmentation by double cutters on a gray sandstone. The process of rock fragmentation was captured by the digital image correlation method. Simulations based on the cohesive element with zero thickness were then conducted to simulate the failure process and evolution of jointed rock under the action of double cutters. A mechanical model is established to deduce the stress evolution in a rock mass by double disc cutters with different penetration depths. The action mechanism and mechanical influence of joints on rock fragmentation were determined. The results show that, under the action of double cutters, the rock with joints is more ready broken than the intact rock mass. The joint acts as a weak interface in the rock mass. Finally, the rock mass is destroyed along the vertical joint, forming rock slag with the joint as the boundary. When the joint dip angle is about 30°, the interaction force between the rock mass and the cutter is low, and the rock fragmentation efficiency is high. And the spacing of joints is also a key factor in the rock-breaking efficiency of double cutters.

Słowa kluczowe

EN

rock fragmentation; crack propagation; tunnel boring; milling machine; TBM

PL

fragmentacja skał; propagacja pęknięć; drążenie tuneli; frezarka; TBM

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 4
• Strony: art. e222, 1--15
• Opis fizyczny: Bibliogr. 26 poz., il., tab., wykr.

Twórcy

autor

Kang Yiqiang

• School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing, China

autor

Yang Renshu

• School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing, China

autor

Yang Liyun

• School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, China

autor

Li Yougliang

autor

Yao Man

• China Railway Construction Heavy Industry Corporation Limited, Changsha, Hunan, China

autor

Gu Shirui

• School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing, China

Bibliografia

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