标题：Study on a digital drilling test-based rock uniaxial compressive strength measurement method
作者：Yang, Jun; Qin, Qian; Jiang, Bei; Wang, Yajun; Li, Shucai
作者机构：[Yang, Jun; Qin, Qian; Jiang, Bei; Wang, Yajun] China Univ Min & Technol Beijing, State Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peopl 更多
通讯作者：Jiang, B;Jiang, B;Jiang, B;Jiang, B
通讯作者地址：[Jiang, B]China Univ Min & Technol Beijing, State Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China;[Jiang, B]China Univ Min & 更多
来源：ARABIAN JOURNAL OF GEOSCIENCES
关键词：Digital drilling; Uniaxial compressive strength; Drilling parameter;; Rock cutting strength; Relational model
摘要：Real-time and accurate measurement of the uniaxial compressive strength of rock on-site is the foundation of the design optimization and digital construction of the support structure in an underground project. Currently, effective methods to obtain the rock uniaxial compressive strength R-c in real-time on-site are scarce. Digital drilling test technology provides a new opportunity to solve this problem; however, the lack of a universal relational model for the drilling parameters versus R-c constrains further development of this technology. In this study, based on developed PDC bit for probing, the S-c parameters of rock cutting strength are proposed, and the relational equation between S-c and drilling parameters is deduced. Using an in-house-developed rock drilling test system, laboratory digital drilling tests for sandstone and mortar specimens with various strengths are performed. Based on the test results, a relational equation between R-c and S-c is developed. Subsequently, a relational model for drilling parameters versus R-c (the DP-R-c model) is developed, and its effectiveness is verified. The results show that the average difference in the uniaxial compressive strength predicted by the DP-R-c model versus the R-c measured in the uniaxial test is less than 10%, which proves the effectiveness of this model. On this basis, we propose a digital drilling test-based rock uniaxial compressive strength real-time measurement method that provides the foundation for the real-time and accurate measurement of the uniaxial compressive strength of the surrounding rock in underground projects.