Particle flow simulation study on uniaxial compression of coal sample with prefabricated fracture

Abstract

In view of the actual problems that the cracks and joints of the primary coal body are developed in the coal mine, and the primary cracks have a significant impact on the mechanical properties of the coal body in the process of instability and failure, based on the macro and micro parameters of the coal body, a numerical model of the coal sample with different parameters of the prefabricated cracks is constructed, This paper explores the influence of prefabricated cracks on the mechanical properties of coal samples, analyzes the specific role of prefabricated cracks on the peak strength and crack propagation of coal samples in the failure process of coal samples, and reveals that the prefabricated cracks have an important influence on the support strength and meso characteristics of coal samples in the process of uniaxial compression, It provides ideas and basis for predicting the support strength of coal body and strengthening the support mode and parameters in the fracture development area of coal mine.