The influence of cracks on pillar strength based on SRM and DFN models

Abstract

This research focuses on the examination of natural fractures within underground mines, emphasizing their substantial impact on the strength and stability of ore pillars. The study adopts the Strength Reduction Method (SRM) theory and employs the Discrete Fracture Network (DFN) model, offering a novel approach to investigating the behavior of fractured rock masses. The objective of this article is to analyze the influence of natural fractures on the strength of ore pillars by employing SRM and DFN methods. The research begins by establishing a multi-level amplification program that incorporates a homogenization process. The findings reveal that, for a W/H ratio of 0.5, the strength reduction aligns consistently with empirical equations. A notable observation is that when W/H is less than or equal to 1.0, there is good agreement, but when W/H exceeds 1.0, there is a tendency to overestimate pillar strength. Subsequent investigations emphasize the significance of considering pillar development in the overall assessment of pillar forces. The study underscores the importance of integrating pillar development into the analysis, aligning with previously established research results. Therefore, by evaluating the strength and failure mechanism of columns under different aspect ratios, we studied the influence of discrete discontinuous bodies on column stability, revealed the influence of natural cracks on column strength, and provided theoretical basis and reference for the design and support of underground mines.

Keywords

• SRM
• Discrete crack network (DFN) model
• Pillar strength
• Mechanism