Study on the influence of in-situ stresses on dynamic fracture behaviors of cracks#br#
DENG Shuai1，2，ZHU Zheming1，2，WANG Lei1，2，LIU Caoyuan1，2，ZHOU Lei1，2，YING Peng1，2
(1. Key Laboratory of Deep Underground Science and Engineering，Sichuan University，Chengdu，Sichuan 610065，China；
2. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China)
Abstract：Deep rock mass exists in high in-situ stress environment and is often disturbed by dynamic loads. In order to study the effect of in-situ stresses on the dynamic fracture behaviors of cracks，the initial stresses of rock were given by lateral pressure equipment to simulate in-situ stresses，and impact experiments were conducted with medium and low speed drop weight impact device. Crack initiation time and crack propagation velocity were obtained by using crack propagation gauge(CPG) in impact test，and numerical simulations were also carried out by using AUTODYN finite different code and ABAQUS finite element code. The experimental and numerical simulation results show that the in-situ stress perpendicular to the crack surface changes the initiation time，crack propagation speed and crack propagation length but has no effect on the critical dynamic stress intensity factor. The in-situ stress perpendicular to the crack surface delays the initiation time of the crack，and the larger the in-situ stress，the lower the crack propagation speed and the shorter the crack propagation length.
邓 帅1，2，朱哲明1，2，王 磊1，2，牛草原1，2，周 磊1，2，应 鹏1，2. 原岩应力对裂纹动态断裂行为的影响规律研究[J]. 岩石力学与工程学报, 2019, 38(10): 1989-1999.
DENG Shuai1，2，ZHU Zheming1，2，WANG Lei1，2，LIU Caoyuan1，2，ZHOU Lei1，2，YING Peng1，2. Study on the influence of in-situ stresses on dynamic fracture behaviors of cracks#br#. , 2019, 38(10): 1989-1999.
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2019, Vol. 38 
