Experimental Study on Fractured Rock Mass Based on Digital Drilling

Fractures are weak surfaces of rock; they are common in underground engineering and are prone to causing engineering disasters. The fracture parameters of rock are the crucial foundation for stability evaluation in engineering. The accurate identification of rock fractures is important for engineering support design, as it is helpful in preventing and reducing engineering accidents caused by fractures. At present, there are few technical methods for fracture identification. Digital drilling test technology provides a new approach to rock fracture identification. In this study, a multi-functional rock mass drilling test system is employed to conduct testing in fractured rock. The response laws of drilling parameters to different fracture positions and angles are analyzed, and an identification model for rock mass fracture parameters while drilling is developed. The results from tests show that the average error in identifying rock mass fracture positions using the fracture parameter identification model is 5.34 mm, and the average error in identifying fracture angles is 2.01°. This study provides a theoretical basis for on-site testing and assessment of rock mass fractures in underground engineering.