Journal Published Online: 18 March 2019
Volume 43, Issue 2

Real-Time Method of Obtaining Rock Mechanics Parameters Based on the Core Drilling Test

CODEN: GTJODJ

Abstract

Accurately obtaining the mechanics parameters of the surrounding rock at an engineering site in real time is a key component of the construction process that is required to determine and adjust the support scheme in a timely manner and thus ensure construction safety. Currently, studies of the real-time measurement methods of the cohesion, c, and internal friction angle, φ, of the surrounding rock at a site are relatively limited, and the digital core drilling test technique provides a new approach for obtaining accurate rock parameters (c and φ) in real time at an underground engineering site. Based on the principle of upper bound analysis, in this article, a relationship model between the core drilling parameters and rock mechanics parameters (CDP-RMP) is established, and the rock core drilling cutting strength is obtained. An inversion method is proposed to obtain the rock parameters (c and φ). Additionally, by using the multifunctional rock digital drilling test system developed, digital core drilling tests are conducted on rock specimens with different lithologies. The results show that the inversion values for the rock parameters c and φ are essentially consistent with the results of the triaxial test, which verifies the accuracy of the CDP-RMP model and that of the inversion method for the rock parameters c and φ. A real-time method for obtaining rock mechanics parameters based on the digital core drilling test is further established. This method can conveniently obtain accurate mechanical parameters for the surrounding rock onsite in real time and provides a foundation for the timely optimization of the support scheme and the informatization construction of underground engineering.

Author Information

Wang, Qi
Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, China
Gao, Hongke
Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, China Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
Jiang, Bei
Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, China Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China School of Civil Engineering and Architecture, University of Jinan, Jinan, China
Yu, Hengchang
Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, China Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
Lv, Yunhong
Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
Pages: 15
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: GTJ20180080
ISSN: 0149-6115
DOI: 10.1520/GTJ20180080