The identification method for rock strength and joint while drilling based on cutting energy density

Hong-ke Gao, Qi Wang, Feng-lin Ma, Bei Jiang, Da-hu Zhai, Song-lin Cai, Chong Zhang, Zhen-guo Bian, Guang-jie Liu

Journal of Central South University ›› 2024, Vol. 31 ›› Issue (2) : 621-635. DOI: 10.1007/s11771-024-5581-z

The identification method for rock strength and joint while drilling based on cutting energy density

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Abstract

Rock strength and joint parameters are the basic parameters reflecting engineering rock quality. The traditional rock strength testing method requires taking cores from the surrounding rock on site and transporting them to the laboratory for testing. It is difficult for the test results to reflect the mechanical properties of rock in an engineering site environment. In this paper, the relationship between rock cutting energy density and drilling parameters is established, a prediction model of rock equivalent strength based on drilling parameters (ES-DP model) is constructed, and systematic rock digital drilling tests are carried out. The test results show that the average difference rate between rock equivalent compressive strength measured by the drilling test is 2.4% compared with traditional test methods. On this basis, the identification model of rock joint parameters based on drilling is established. The average accuracy of the rock joint position and width measured by the model is 1.8 and 1.6 mm, respectively. Based on the above research, an identification method for rock strength and joint while drilling is proposed in this paper. It provides a new method for simultaneous in-situ testing of the strength parameters and structural characteristics of surrounding rock in underground engineering.

Keywords

cutting energy density / equivalent strength / structural characteristics / identification while drilling / in situ testing

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Hong-ke Gao, Qi Wang, Feng-lin Ma, Bei Jiang, Da-hu Zhai, Song-lin Cai, Chong Zhang, Zhen-guo Bian, Guang-jie Liu. The identification method for rock strength and joint while drilling based on cutting energy density. Journal of Central South University, 2024, 31(2): 621‒635 https://doi.org/10.1007/s11771-024-5581-z

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