## 1 Introduction
In the field of rock drilling and cutting, [PERSON] et al., utilized the Drucker-Prager criterion for orthogonal cutting based on three-dimensional mechanical modeling of rocks, incorporating weights on intermediate principal stresses, and proposed an analytical model [14]. [PERSON] et al., studied the effect of drilling parameters on rock-cutting efficiency, developing a cutting temperature model, and discussed the sensitivity of cutting tooth temperature to different parameters using orthogonal analysis [15]. [PERSON] et al., conducted dynamic experiments and numerical simulations on a hard rock to quantify the influence of various impact parameters on rock-breaking efficiency [16]. [PERSON] et al., performed finite element simulations to analyze the thermal-structural coupling during rock breaking using a full-size Polycrystalline Diamond Compact (PDC) bit, optimizing the bit's life through the distribution of contact stresses on the PDC cutting teeth [17]. [PERSON] et al., conducted PDC single-tooth cutting experiments considering rock material properties and studied the rock-breaking mechanism of cutting teeth at high temperatures [18]. While coring bits' drilling and cutting mechanism significantly impacts fidelity performance during coring, research in this area is relatively limited compared to the extensive studies on rock fragmentation during drilling. And existing studies primarily focused on rock fragmentation mechanisms and did not specifically address the effects of drill bits' structural parameters on fidelity performance. Therefore, further research is necessary to understand the relationship between drill bits' structural parameters and fidelity performance during coring operations. Theoretical research on drill bits' fidelity coring must catch up with engineering applications. In the oil and gas industry, new coring tools and in situ simulation devices can help improve resource exploration and production efficiency and safety in deep and ultra-deep areas. An in-depth study of the influence of the structural parameters of drill bits on fidelity coring performance during the drilling and cutting process is of great value for the application of fidelity coring technology to coring bits. This paper analyzes the influence of back-rake and side-rake angles as a drill bit's structural parameters on fidelity performance. We discuss the drilling and cutting mechanism of the core drill bit, adopt the Drucker-Prager criterion as the rock-yielding criterion, and conduct 3D finite element analysis on the drilling and breaking process of the core drill bit. This analysis helps identify the relationship between core drill bit parameters and fidelity coring performance. Furthermore, optimizing the design of core drill bits' structural parameters and improving the effect of deep in situ coring is of great significance. This research provides theoretical support for deep fidelity coring. The specific arrangement of this article is as follows: Section 2 establishes an analytical model of the fidelity performance of a drill core; Section 3 explains the failure criteria of rocks and the various parameters of the simulation model; Section 4 verifies the influence of the rear and side camber angles on fidelity performance through simulation experiments; and the fifth section provides the conclusions.