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ORIGINAL RESEARCH article

Front. Built Environ.
Sec. Geotechnical Engineering
Volume 10 - 2024 | doi: 10.3389/fbuil.2024.1207832
This article is part of the Research Topic Big Data Mining of Tunnel Boring Machine View all articles

Mechanical Property Testing and Damage Assessment of Regenerated Rock Mass with Very Weakly Bonded Cement

Provisionally accepted
Wang Ping Wang Ping 1Yongzhi Jiang Yongzhi Jiang 1*Li Ding Li Ding 2Peng Li Peng Li 1Huan Wu Huan Wu 1Ze Zhou Ze Zhou 3Jinlian Zhou Jinlian Zhou 4Xiangyang Zhang Xiangyang Zhang 5
  • 1 Hunan University of Science and Technology, Xiangtan, Hunan Province, China
  • 2 Zhejiang engineering survey and design institute group co.LTD, Zhejiang, China
  • 3 Guizhou Institute of Technology, Guiyang, Guizhou, China
  • 4 Guizhou Panjiang Refined Coal Co.,Ltd, Liupanshui, China
  • 5 The Ministry of Education Key Laboratory of Safe and Efficient Coal Mining was jointly established by the Ministry of Education, Xuzhou, China

The final, formatted version of the article will be published soon.

    The regenerated rock mass is a bearing structure formed by natural compaction in the hollow area, and the investigation of its optimal consolidation material and consolidation parameters is the key to improve the supporting effect and bearing stability of roadway. The effects of consolidation materials and consolidation parameters on the stability of the regenerative rock mass were studied by laboratory tests, numerical simulation and theoretical analysis. Acoustic emission was used to monitor the variation characteristics of energy and ringing count in the process of rock mass failure, and the bonding interface area of the extremely weak cementation regeneration structure was tested by electron microscope scanning. The results show that: there is a quadratic function relationship between water-cement ratio of different cementing materials and bond strength of recycled rock mass; the regenerative rock mass of superfine cement has the highest compressive strength and the largest cumulative energy of acoustic emission, this shows that it has the strongest bearing capacity, the highest elastic performance, the most stable micro-fracture development and the best cementation effect, then followed by ordinary cement, gypsum, laterite ; scanning test showed that the regenerated structure had more internal pores, loose structure and poor cementation; three-dimensional scanning modeling of four representative broken rock blocks was carried out, and the simulation verified : The stability control of roadway surrounding rock in regenerated rock mass has become a difficult problem to limit the deep mining of coal resources, but the selection of the best consolidation material and consolidation parameters is the key to improve the support effect and bearing stability of the regenerated rock roadway.

    Keywords: Regenerated rock mass, Cementing material, Acoustic emission b-value, scanning electron microscope, numerical simulation

    Received: 18 Apr 2023; Accepted: 29 Aug 2024.

    Copyright: © 2024 Ping, Jiang, Ding, Li, Wu, Zhou, Zhou and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Yongzhi Jiang, Hunan University of Science and Technology, Xiangtan, 130012, Hunan Province, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.