4.6 Article

Rock Strength Determination Based on Rock Drillability Index and Drilling Specific Energy: Numerical Simulation Using Discrete Element Method

期刊

IEEE ACCESS
卷 9, 期 -, 页码 43923-43937

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3061552

关键词

Rocks; Force; Partial discharges; Indexes; Numerical models; Numerical simulation; Surface treatment; Rock drillability index; drilling specific energy; heterogeneity; discrete element method; cutting force

资金

  1. National Natural Science Foundation of China [52074260]

向作者/读者索取更多资源

This research studied two real-time rock strength determination models based on drilling parameters using a discrete element model, providing a method for simulating rock behavior. The applicability of rock drillability index and drilling specific energy in rock strength assessment was investigated, with results showing that the rock drillability index is more accurate than drilling specific energy.
In the present research, two real-time rock strength determination models based on the drilling parameters were studied. Firstly, a discrete element software named Particle Flow Code in 2 Dimensions (PFC2D) was used to analyze the applicability of rock drillability index and drilling specific energy, in which graded particle assemblies were created to simulate the rock behaviour. In the numerical models, Weibull distribution was used to randomize the bonds between particles and make the assembled rock model with different heterogeneity. The drilling process of a PDC (polycrystalline diamond compact) cutter was modelled in two steps: horizontal linear rock cutting and vertical pressing-in progress. From the horizontal linear rock cutting process, the peak cutting forces were obtained and vertical pressing-in process outputs the relationship between normal force and cutting depth. Subsequently, the methods for calculating rock drillability index and drilling specific energy were proposed in the discrete element model. Then, the relationship between the calculated indexes and rock strength was investigated (supported with the regression analysis). Moreover, the effect of rock heterogeneity, along with error comparison between the above two indexes, were discussed. The results showed that the rock drillability index is more accurate than drilling specific energy in rock strength assessment (The error is about 10% smaller).

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