Wear mechanism and life prediction of the ripper in a 9‐m‐diameter shield machine tunneling project of the Beijing new airport line in a sand‐pebble stratum

Bibliographic Details
Title: Wear mechanism and life prediction of the ripper in a 9‐m‐diameter shield machine tunneling project of the Beijing new airport line in a sand‐pebble stratum
Authors: Hua Jiang, Jiachen Zhu, Xiaoyan Zhang, Jinxun Zhang, Hongliang Li, Lingfeng Meng
Source: Deep Underground Science and Engineering, Vol 1, Iss 1, Pp 65-76 (2022)
Publisher Information: Wiley, 2022.
Publication Year: 2022
Collection: LCC:Engineering geology. Rock mechanics. Soil mechanics. Underground construction
Subject Terms: 9‐m‐diameter shield, long‐distance shield driving, optimum driving distance, sand‐pebble stratum, tool wear, wear prediction model, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712
More Details: Abstract Tool wear is a noteworthy problem in the process of shield tunneling, and the degree of wear varies with stratum. The sand‐pebble strata in Beijing are typically mechanically unstable. However, many subways are buried wholly or partially in sand‐pebble strata. Taking the Beijing New Airport line tunneling project as research background, this study evaluated the wear characteristics of the multiconfiguration rippers of a 9‐m‐diameter spoke‐type shield tunneling machine in a sand‐pebble stratum. The wear values of five ripper teeth and ripper flanks were analyzed based on field‐measured data from the Beijing New Airport line project. As the analytical results show, the wear value generally increases as the installation radius enlarges with the rise of cutting trace length. The wear of the 190‐rippers was divided into five categories: pedestal wear, ripper teeth collapse, uniform wear, ripper teeth falling off and ripper flank wear. Uniform wear of the ripper teeth and ripper flank wear were the two abrasion types of the 190‐rippers. The teeth of the 155‐rippers mostly maintained their cutting capacity under the protection of the 190‐rippers. A wear prediction model of linear fitting field data was developed for a 190‐ripper face to obtain the optimum shield driving distance in the sand‐pebble stratum. The average wear coefficients of the 190‐ripper before and after replacement matched well, being 0.045 and 0.066 mm/km, respectively. The results of this study provide a theoretical reference for tool wear prediction in shield construction under similar geological conditions.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2770-1328
2097-0668
Relation: https://doaj.org/toc/2097-0668; https://doaj.org/toc/2770-1328
DOI: 10.1002/dug2.12010
Access URL: https://doaj.org/article/102cdd14b2cf40caa953d9f8b10b5094
Accession Number: edsdoj.102cdd14b2cf40caa953d9f8b10b5094
Database: Directory of Open Access Journals
More Details
ISSN:27701328
20970668
DOI:10.1002/dug2.12010
Published in:Deep Underground Science and Engineering
Language:English