Abstract
To study the influence of fillings on rock failure. By turning to the Drucker-Prager strength model and cumulative damage criteria, investigations are made, with the nonlinear AUTODYN software, into crack propagation behaviors in crack-filled and unfilled specimens under uniaxial dynamic loading. Under investigations are crack initiation position, sequence and angle, and coalescence mode. According to the mode of propagation and coalescence, cracks are divided into three types, i.e., the tensile wing, the antiwing, and the horsetail. The simulation results show that under uniaxial dynamic loading, differences are found in initiation position, angle, and coalescence mode for specimens with cracks filled or otherwise. However, filling does not affect crack initiation sequence. Under the same loading, the damage to filled specimen is less severe than that to the unfilled specimen.
Highlights
Deep underground civil engineering construction such as energy resources exploration and subway construction have given rise to large scale research done on in-depth rock mechanics [1, 2]
Crack researches mainly revolve around the studies of its type, initiation position, propagation path, and coalescence mode
When it comes to underload crack propagation, Cen et al [22] derived five basic modes
Summary
Deep underground civil engineering construction such as energy resources exploration and subway construction have given rise to large scale research done on in-depth rock mechanics [1, 2]. To obtain a clear understanding, many scholars have conducted physical experiments [5,6,7] and numerical simulation [8,9,10,11] to investigate the evolution process of crack initiation, propagation, and coalescence. Rock mass is often under dynamic loading induced by blasting or earthquake In this case, the rocks always experience an internal cracking process through the stages of crack initiation, propagation, and coalescence [12]. Zhang et al [14] conducted investigations into the strength features of the noncoalescent rock and crack coalescence modes with specimens under the strains of 1:7 × 10−5 s−1, 1:7 × 10−3 s−1, and 1:7 × 10−1 s−1. We will conduct investigations into the crack propagation and coalescence process of the two coplanar cracks of different inclination angles and under high straining loads. The impact of fillings on rock failure is considered, hoping to draw some beneficial conclusions and make significant contributions to the consolidation of the rocks under construction
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