(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)
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.
[1] 岳中琦. 钻孔过程监测(DPM)对工程岩体质量评价方法的完善与提升[J]. 岩石力学与工程学报，2014，33(10)：1 977–1 996.(YUE Zhongqi. Drilling process monitoring for refining and upgrading rock mass quality classification methods[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(10)：1 977–1 996.(in Chinese))
[2] FLINCHUM B A，STEVEN HOLBROOK W，REMPE D，et al. Critical zone structure under a granite ridge inferred from drilling and three‐dimensional seismic refraction data[J]. Journal of Geophysical Research：Earth Surface，2018，123(6)：1 317–1 343.
[3] 王 琦，高红科，蒋振华，等. 地下工程围岩数字钻探测试系统研发与应用[J]. 岩石力学与工程学报，2020，39(2)：301–310.(WANG Qi，GAO Hongke，JIANG Zhenhua，et al. Development and application of a surrounding rock digital drilling test system of underground engineering [J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(2)：301–310.(in Chinese))
[4] 刘家顺，郑智勇，左建平，等. 定向剪切应力路径下类弱胶结软岩椭圆各向异性强度准则[J]. 岩石力学与工程学报，2024，43(5)：1 219–1 229.(LIU Jiashun，ZHENG Zhiyong，ZUO Jianping，et al. Elliptical anisotropic strength criterion of similar weakly cemented soft rock under directional shear stress path[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(5)：1 219–1 229.(in Chinese))
[5] 陈天宇，冯夏庭，张希巍，等. 黑色页岩力学特性及各向异性特性试验研究[J]. 岩石力学与工程学报，2014，33(9)：1 772–1 779. (CHEN Tianyu，FENG Xiating，ZHANG Xiwei，et al. Experimental study on mechanical and anisotropic properties of black shale[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(9)：1 772–1 779. (in Chinese))
[6] 中华人民共和国国家标准编写组. GBT50266—2013工程岩体试验方法标准[S]. 北京：中国计划出版社，2013.(The National Standards Compilation Group of People?s Republic of China. GB/T50266—2013 Standards for tests method of engineering rock masses[S]. Beijing：China Planning Press，2013.(in Chinese))
[7] WANG X F，PENG P，SHAN Z G，et al. In situ strength profiles along two adjacent vertical drillholes from digitalization of hydraulic rotary drilling[J]. Journal of Rock Mechanics and Geotechnical Engineering，2023，15(1)：146–168.
[8] 岳中琦，李焯芬，罗锦添，等. 香港大学钻孔过程数字监测仪在土钉加固斜坡工程中的应用[J]. 岩石力学与工程学报，2002，21(11)：1 685–1 690.(YUE Zhongqi，Lee C F，LUO Jintian，et al. Application of the University of Hong Kong's drilling process digital monitoring instrument in soil nailing reinforcement slope engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(11)：1 685–1 690. (in Chinese))
[9] 王玉杰，佘 磊，赵宇飞，等. 基于数字钻进技术的岩石强度参数测定试验研究[J]. 岩土工程学报，2020，42(9)：1 669–1 678.(WANG Yujie，SHE Lei，ZHAO Yufei，et al. Experimental study on measurement of rock strength parameters based on digital drilling technology[J]. Chinese Journal of Geotechnical Engineering，2020，42(9)：1 669–1 678.(in Chinese))
[10] ZHANG K，HOU R，ZHANG G，et al. Rock drillability assessment and lithology classification based on the operating parameters of a drifter：case study in a coal mine in China[J]. Rock Mechanics and Rock Engineering，2016，49(1)：329–334.
[11] KARASAWA H，OHNO T，KOSUGI M，et al. Methods to estimate the rock strength and tooth wear while drilling with roller-bits—Part 1：milled-tooth bits[J]. Journal of Energy Resources Technology，2002，124(3)：125–132.
[12] YUE Z Q，LEE C F，LAW K T，et al. Automatic monitoring of rotary-percussive drilling for ground characterization—illustrated by a case example in Hong Kong[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(4)：573–612.
[13] GUI M W，SOGA K，BOLTON M D，et al. Instrumented borehole drilling for subsurface investigation[J]. Journal of Geotechnical and Geoenvironmental Engineering，2002，128(4)：283–291.
[14] TEALE R. The concept of specific energy in rock drilling[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1965，2(2)：57–73.
[15] KAHRAMAN S，BILGIN N，FERIDUNOGLU C. Dominant rock properties affecting the penetration rate of percussive drills[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(5)：711–723.
[16] 谭卓英，蔡美峰，岳中琦，等. 钻进参数用于香港复杂风化花岗岩地层的界面识别[J]. 岩石力学与工程学报，2006，25(增1)：2 939–2 945. (TAN Zhuoying，CAI Meifeng，YUE Zhongqi，et al. Interface identification of intricate weathered granite ground investigation in Hong Kong using drilling parameters[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：2 939–2 945.(in Chinese))
[17] 谭卓英，岳中琦，谭国焕，等. 金刚石钻进比功及风化花岗岩实时分级研究[J]. 岩石力学与工程学报，2007，26(增1)：2 907–2 912. (TAN Zhuoying，YUE Zhongqi，TAN Guohuan，et al. Study on specific energy of diamond drilling and real-time classification of weathered granite[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 907–2 912.(in Chinese))
[18] 梁栋才，汤 华，吴振君，等. 基于多钻进参数和概率分类方法的地层识别研究[J]. 岩土力学，2022，43(4)：1 123–1 134.(LIANG Dongcai，TANG Hua，WU Zhenjun，et al. Stratum identification based on multiple drilling parameters and probability classification[J]. Rock and Soil Mechanics，2022，43(4)：1 123–1 134.(in Chinese))
[19] HUANG H，LECAMPION B，DETOURNAY E. Discrete element modeling of tool-rock interaction I：rock cutting[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2013，37(13)：1 913–1 929.
[20] HUANG H，DETOURNAY E. Discrete element modeling of tool-rock interaction II：rock indentation[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2013，37(13)：1 930–1 947.
[21] KALANTARI S，BAGHBANAN A，HASHEMALHOSSEINI H. An analytical model for estimating rock strength parameters from small-scale drilling data[J]. Journal of Rock Mechanics and Geotechnical Engineering，2019，11(1)：135–145.
[22] 王 琦，孙会彬，江 贝，等. 基于数字钻探和支持向量机预测岩体单轴抗压强度的方法[J]. 岩土力学，2019，40(3)：1 221–1 228. (WANG Qi，SUN Huibin，JIANG Bei，et al. A method for predicting uniaxial compressive strength of rock mass based on digital drilling test technology and support vector machine[J]. Rock and Soil Mechanics，2019，40(3)：1 221–1 228.(in Chinese))
[23] 房昱纬，吴振君，盛 谦，等. 基于超前钻探测试的隧道地层智能识别方法[J]. 岩土力学，2020，41(7)：2 494–2 503.(FANG Yuwei，WU Zhenjun，SHENG Qian，et al. Intelligent recognition of tunnel stratum based on advanced drilling tests[J]. Rock and Soil Mechanics，2020，41(7)：2 494–2 503.(in Chinese))
[24] CHENG X，TANG H，WU Z，et al. BILSTM-based deep neural network for rock-mass classification prediction using depth-sequence MWD data：A case study of a tunnel in Yunnan，China[J]. Applied Sciences，2023，13(10)：2 076–3 417.
[25] WANG H，HE M. Determining method of tensile strength of rock based on friction characteristics in the drilling process[J]. Rock Mechanics and Rock Engineering，2023，56(6)：4 211–4 227.
[26] 刘勇斌，张晓平，李馨芳，等. 基于冲击回转钻进的岩石强度随钻识别研究[J]. 岩土力学，2024，45(3)：857–866.(LIU Yongbin，ZHANG Xiaoping，LI Xinfang，et al. Rock strength identification while drilling based on percussive rotary drilling[J]. Rock and Soil Mechanics，2024，45(3)：857–866.(in Chinese))
[27] 付志亮，王 亮. 煤层顶底板岩石点荷载强度与拉压强度对比试验研究[J]. 岩石力学与工程学报，2013，32(1)：88–96.(FU Zhiliang，WANG Liang. Comparative experimental research on point load strength，uniaxial compressive strength and tensile strength for rocks in roof and floor of coal seam[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(1)：88–96.(in Chinese))
[28] 刘宗平，王润起，吴小林，等. 施密特锤试验数据处理方法及其在预估岩石可钻性中的应用[J]. 现代地质，1990，4(4)：113–125.(LIU Zongping，WANG Runqi，WU Xiaolin，et al. Data processing method of Schmidt hammer test and its application in predicting rock drillability[J]. Modern Geology，1990，4(4)：113–125.(in Chinese))
[29] 侯兴民，孙 蒙，张一林. 振动法与超声波法测试岩块纵波波速的实测比对研究[J]. 振动与冲击，2021，40(9)：264–269.(HOU Xingmin，SUN Meng，ZHANG Yilin. Comparison between vibration method and ultrasonic method in measuring longitudinal wave velocity of rock block[J]. Journal of Vibration and Shock，2021，40(9)：264–269.(in Chinese))
[30] AYDIN A，BASU A. The Schmidt hammer in rock material characterization[J]. Engineering Geology，2005，81(1)：1–14.
[31] AYDIN A. ISRM Suggested method for determination of the Schmidt hammer rebound hardness：Revised version[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(3)：627–634.
[32] 曾俊强，王玉杰，曹瑞琅，等. 基于钻孔过程监测的花岗岩钻进比能研究[J]. 水利水电技术，2017，48(4)：112–117.(ZENG Junqiang，WANG Yujie，CAO Ruilang，et al. Drilling process monitoring-based study on granite drilling specific energy[J]. Water Resources and Hydropower Engineering，2017，48(4)：112–117.(in Chinese))
[33] 冯上鑫. 基于钻孔过程机–岩相互作用机制的岩体力学参数识别研究[博士学位论文][D]. 西安：西安理工大学，2021.(FENG Shangxin. Experimental studies of bitrock interaction for rock mechanical parameter identification in rotary drilling[Ph. D. Thesis][D]. Xi?an：Xi?an University of Technology，2021.(in Chinese))
[34] DETOURNAY E，DEFOURNY P. A phenomenological model for the drilling action of drag bits[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1992，29(1)：13–23.
[35] 中华人民共和国国家标准编写组. GB50007—2011建筑地基基础设计规范[S]. 北京：中国建筑工业出版社，2011.(The National Standards Compilation Group of People?s Republic of China. GB50007—2011 Code for design of building foundation[S]. Beijing：China Architecture and Building Press，2011.(in Chinese))
[36] 中华人民共和国行业标准编写组. FD003—2007风电机组地基基础设计规定(试行)[S]. 北京：中国水利水电出版社，2007.(The Professional Standards Compilation Group of People?s Republic of China. FD003—2007 Requirements for foundation design of wind turbines(trial)[S]. Beijing：China Water Power Press，2007.(in Chinese))
2025, Vol. 44 
