In-situ tests on quantitative evaluation of rock mass integrity based on drilling process index

CAO Rui-lang; WANG Yu-jie; ZHAO Yu-fei; WANG Xiao-gang; HE Sun-wen; PENG Lin-jun

doi:10.11779/CJGE202104010

Volume 43 Issue 4

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Chinese Journal of Geotechnical Engineering > 2021 > 43(4): 679-687. > DOI: 10.11779/CJGE202104010

CAO Rui-lang, WANG Yu-jie, ZHAO Yu-fei, WANG Xiao-gang, HE Sun-wen, PENG Lin-jun. In-situ tests on quantitative evaluation of rock mass integrity based on drilling process index[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(4): 679-687. DOI: 10.11779/CJGE202104010

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In-situ tests on quantitative evaluation of rock mass integrity based on drilling process index

1.
China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2.
Sinohydro Bureau 14th Corporation, Kunming 650051, China
3.
Academician Pioneering Park, Dalian University, Dalian 116622, China

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Received Date: July 13, 2020
Available Online: December 04, 2022

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Abstract

Abstract

The real-time response characteristics of drilling tools contain important engineering geological information. By interpreting the drilling data, the rock mass integrity can be quantitatively evaluated, which provides a new way to quickly obtain the geological characteristics of engineering rock mass. A new type of digital geological drilling monitoring system is established by using the high-precision digital hydraulic, torque, rotational speed and laser displacement sensors to monitor the transmission part of geological drill. Based on the real-time, continuous and synchronous drilling response characteristic parameters of drilling tools, the functional relationships among drilling thrust, rotational torque, rotational speed and drilling rate are established. On this basis, the influences of drilling machine parameters on drilling rate are filtered out, and a new index, drilling process index, is proposed to express the rock mass integrity. The digital change of the drilling process index can comprehensively reflect the fragmentation degree of rock mass, and the rock mass integrity can be obtained through the information method and data operation. The complicated procedures such as statistical work of RQD and drillingcore sketch are reduced, and the adverse influences of human subjective factors are also reduced.
- rock mass integrity,
- geological drill,
- drilling process index,
- drilling rate,
- in-situ test

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References

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