Experimental and numerical study on the indentation behavior of TBM disc cutter on hard-rock precutting kerfs by high-pressure abrasive water jet

• Autorzy: Cheng Jian‑Long , Yang Sheng‑Qi , Han Wei-Feng , Zhang Zuo-Ru , Jiang Zi-Hao , Lu Jun-Fu

Identyfikatory

DOI

10.1007/s43452-021-00360-x

• Języki publikacji: EN

Abstrakty

EN

Tunnel boring machine (TBM) excavation of high strength or highly abrasive rock strata has some limitations, such as slow advance speed, low rock-breaking efficiency, and significant increase in the disc cutter changes and construction cost. To improve the rock boreability, a novel breakage method for hard rocks using a TBM disc cutter penetrating into kerfs precut by a high-pressure abrasive water jet is explored. With a confining pressure of 5 MPa, a series of cutter indentation tests and particle flow simulations of granite with two precutting kerfs are carried out to investigate the indentation behavior and the breaking efficiency. The effects of the kerf depth and the kerf spacing on the normal indentation force, rock chip volume, and specific energy are studied. The initiation, propagation, and coalescence modes of the surface and internal cracks and the failure mechanism are analyzed. The results show that the average peak force decreases significantly with the increase of the kerf depth, and the maximum rock chip volume and minimum specific energy are obtained at a kerf depth of 18.14 mm. The failure mode of kerf specimens after two indentations could be divided into the flat and slow shallow failure, one-sided inclined failure, and two-sided inclined failure. The micro-crack distribution of a single shallow kerf under low confining pressure is similar to that of intact rocks, while it is oblate and semi-elliptical under high confining pressure. However, for a single deep kerf, the breakage consists of a wedge-shaped crushed zone, a failure zone, and a damage zone around the kerf boundary and the bilateral inclined cracks, which are almost not affected by the confining pressure.

Słowa kluczowe

EN

hard rock; TBM disc cutter; high-pressure abrasive water jet; indentation test; failure mechanism

PL

skała; wgniecenie; awaria

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2022
• Tom: Vol. 22, no. 1
• Strony: art. no. e37, 2022
• Opis fizyczny: Bibliogr. 42 poz., rys., wykr.

Twórcy

autor

Cheng Jian‑Long

• State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, People’s Republic of China

• https://orcid.org/0000-0002-8671-4770

autor

Yang Sheng‑Qi

• State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, People’s Republic of China

autor

Han Wei-Feng

• State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou 450001, People’s Republic of China

autor

Zhang Zuo-Ru

• The Green Aerotechnics Research Institute of Chongqing Jiaotong University, Chongqing 401120, People’s Republic of China

autor

Jiang Zi-Hao

• State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, People’s Republic of China

autor

Lu Jun-Fu

• State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, People’s Republic of China

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)