Drilling-based measuring method for the c-φ parameter of rock and its field application  

作　　者：Bei Jiang Fenglin Ma Qi Wang Hongke Gao Dahu Zhai Yusong Deng Chuanjie Xu Liangdi Yao 

机构地区：[1]State Key Laboratory for Tunnel Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China [3]Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan 250061,China

出　　处：《International Journal of Mining Science and Technology》2024年第1期65-76,共12页矿业科学技术学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2023YFC2907600);the National Natural Science Foundation of China(Nos.42077267,42277174 and 52074164);the Natural Science Foundation of Shandong Province,China(No.ZR2020JQ23);the Opening Project of State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology(No.KFJJ21-02Z);the Fundamental Research Funds for the Central Universities,China(No.2022JCCXSB03).

摘　　要：The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ. In this paper, a new rock cutting analysis model that considers the influence of the rock crushing zone(RCZ) is built. The formula for an ultimate cutting force is established based on the limit equilibrium principle. The relationship between digital drilling parameters(DDP) and the c-φ parameter(DDP-cφ formula, where c refers to the cohesion and φ refers to the internal friction angle) is derived, and the response of drilling parameters and cutting ratio to the strength parameters is analyzed. The drillingbased measuring method for the c-φ parameter of rock is constructed. The laboratory verification test is then completed, and the difference in results between the drilling test and the compression test is less than 6%. On this basis, in-situ rock drilling tests in a traffic tunnel and a coal mine roadway are carried out, and the strength parameters of the surrounding rock are effectively tested. The average difference ratio of the results is less than 11%, which verifies the effectiveness of the proposed method for obtaining the strength parameters based on digital drilling. This study provides methodological support for field testing of rock strength parameters.

关 键 词：Digital drilling Rock crushing zone c-u parameter Measurement method Field application 

分 类 号：TD315[矿业工程—矿井建设]