Abstract
The natural rock that contains micro particles, holes, cracks, impurities, etc. has a complex composition. According to whether the crack is closed or not, kinds of cracks can be divided into two types: open type and closed type. There was a bottleneck in the preparation of the test piece when the indoor test method analyzes the built-in closed cracks of rock materials, so PFC has its unique advantages in simulation analysis of fractured rocks with closed cracks. In order to analyze the influence of the inclination angle, length of the crack above the tunnel and the tunnel spacing on the tunnel failure and crack propagation, the particle was based on the granular flow microscopic parameters. It was shown that with the increase of the inclination of the pre-crack on the upper side of the tunnel, the distance of the tunnel and the length of the crack, the final failure mode of the specimen is similar to that of the non-crack specimen. The initiation of the crack at the end of a certain length of prefabricated crack is mainly affected by its inclination angle. The greater the inclination angle, the earlier the crack initiation is relatively early.
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