Complexity Feedback of Individual Indexes and Composition Analysis of Specific Energy Index for Measurement-While-Drilling Technology of Roof Bolter

During the drilling process of the top rock layer with a roof bolter, monitoring certain resultant signals can provide feedback on different rock lithology and thickness parameters of the roof, which can optimize support parameters and evaluate the risk of roof fall. This study analyzed and studied the complexity feedback degree of individual indexes (thrust, torque, and propulsion speed) and specific energy index for revealing different rocks while maintaining a certain rotation rate in order to provide basic data reference and obtain more optimized feedback indexes for measurement-while-drilling (MWD) technology of roof bolter. More importantly, the study analyzed and discussed the composition and feedback degree of torque energy and thrust energy in the specific energy index based on measured feedback level analysis. The results showed that the feedback of torque energy was relatively better, and its weight for indicator contribution should be increased, which can provide a basis for optimizing the specific energy index in the later stage.