APPLIED GEOPHYSICS     2025 22 (2):  447-460    ISSN: 1672-7975  CN: 11-5212/O Quick and reliable approach for rating underground engineering rock mass based on RMR system Peng He,#, Zhi-kang Li,#, Feng Jiang,#,*, Gang Wang,# , Wen-peng Yuan,#, Zheng-hu Ma, Chuan-xin Yang, Zihao Jiang 1.Department. of Civil Engineering, Shandong University of Science and Technology, Qingdao 266590, China 2.College of Civil Engineering, Fujian University of Technology, Fuzhou, 350118, China Received: 2024-06-12  Revised: 2024-07-29  Online: null Supporting info