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| Prediction of formation strength using drilling process monitoring and rebound testing |
| WANG Teng1, 2, WU Zhenjun1, 2, TANG Hua1, 2, WU Jianliang3, JIA Zeqing1, 2, CHENG Xu1, 2, FANG Yuwei1, 4 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. China Construction 5th Engineering Bureau, Changsha, Hunan 410004, China; 4. Broadvision Engineering Consultants, Kunming, Yunnan 650011, China)
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Abstract To accurately and efficiently predict the uniaxial compressive strength (UCS) of rock at varying depths within a borehole, an efficient UCS prediction method based on drilling process monitoring (DPM) technology and field core rebound tests is proposed. Initially, the measured DPM parameters are processed to create a pure drilling process curve, which is then averaged over specific intervals using an automatic segmentation algorithm. Subsequently, the drilling specific energy (fracture energy ratio) curve is computed along the entire borehole depth by applying a modified drilling pressure and torque model. Finally, based on core rebound tests, a functional relationship between the borehole drilling specific energy and UCS is established to obtain the rock UCS curve along the borehole depth, and the predicted results are validated by foundation bearing capacity curves obtained from cone dynamic penetration tests. The study reveals that the drilling oil pressure and the self-weight of the drill string jointly exert influence on the drill bit, with the self-weight accounting for 48.2% of the total pressure, which varies with depth. The drilling specific energy remains relatively stable despite drill bit replacements and fluctuations in drilling oil pressure, but it is more sensitive to changes in formation properties compared to drilling speed. Through the Yongchang Expressway slope drilling test, the predicted frequency distribution intervals of rock UCS for each borehole align with the foundation bearing capacity, thereby validating the effectiveness of the proposed method.
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2025, Vol. 44 
