Drilling-based measuring method for the c-φ parameter of rock and its field application

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING International Journal of Mining Science and Technology Pub Date : 2024-01-01 DOI:10.1016/j.ijmst.2023.06.005

Bei Jiang , Fenglin Ma , Qi Wang , Hongke Gao , Dahu Zhai , Yusong Deng , Chuanjie Xu , Liangdi Yao

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Abstract

The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ. In this paper, a new rock cutting analysis model that considers the influence of the rock crushing zone (RCZ) is built. The formula for an ultimate cutting force is established based on the limit equilibrium principle. The relationship between digital drilling parameters (DDP) and the c-φ parameter (DDP-cφ formula, where c refers to the cohesion and φ refers to the internal friction angle) is derived, and the response of drilling parameters and cutting ratio to the strength parameters is analyzed. The drilling-based measuring method for the c-φ parameter of rock is constructed. The laboratory verification test is then completed, and the difference in results between the drilling test and the compression test is less than 6%. On this basis, in-situ rock drilling tests in a traffic tunnel and a coal mine roadway are carried out, and the strength parameters of the surrounding rock are effectively tested. The average difference ratio of the results is less than 11%, which verifies the effectiveness of the proposed method for obtaining the strength parameters based on digital drilling. This study provides methodological support for field testing of rock strength parameters.

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岩石c-φ参数的钻孔测量方法及其现场应用

钻探试验技术使得在原位精确获取岩石强度参数成为可能。本文建立了一个考虑岩石破碎带（RCZ）影响的新型岩石切割分析模型。根据极限平衡原理建立了极限切削力公式。得出了数字钻孔参数（DDP）与 c-φ 参数（DDP-cφ 公式，其中 c 指内聚力，φ 指内摩擦角）之间的关系，并分析了钻孔参数和切削比对强度参数的响应。构建了基于钻孔的岩石 c-φ 参数测量方法。随后完成了实验室验证试验，钻孔试验和压缩试验的结果差异小于 6%。在此基础上，进行了交通隧道和煤矿巷道的原位凿岩试验，对围岩的强度参数进行了有效测试。结果的平均差异比小于 11%，验证了所提出的基于数字钻孔获取强度参数的方法的有效性。该研究为现场测试岩石强度参数提供了方法支持。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.