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| Study on dynamic response law of anchored rock mass under lateral impact loads |
| WU Yongzheng1，2，3，FU Yukai1，2，3，HAO Dengyun1，2，3 |
| (1. Coal Mining and Designing Department，Tiandi Science and Technology Co.，Ltd.，Beijing 100013，China；2. Coal Mining and Designing Branch，China Coal Research Institute，Beijing 100013，China；3. State Key Laboratory of Coal Mining and Clean Utilization，China Coal Research Institute，Beijing 100013，China) |
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Abstract Rockbolt support system is an important technical approach to control the dynamic disasters that occurr in deep underground engineering with brittle surrounding rockmass，but the dynamic anchorage theory still lags behind the engineering practice. In this investigation，the indoor similar physical model test was performed to research the dynamic response law of rock mass with anchors under lateral impact loads. The influences of the impact energy and the mechanical characteristics of the anchor on the mechanical behavior of rock mass were analyzed. The test results show that shear and flexural fractures are the mainly mode of the rockmass with anchors，and that the inclined fractures in the middle span at about 45°with the normal direction are dense. The strength and toughness of the rockbolt can inhibit the development of the cracks of the rockmass，especially the connected cracks. The higher the rockbolt strength，the greater the impact absorption energy，the smaller the crack opening of the anchored rockmass，and the stronger the overall energy absorption capacity of the anchored rockmass. The impact velocity and the rockbolt strength affect the impact force of the drop weight and the axial force of the rockbolt. Specifically，the larger the impact velocity is，the larger the platform values of both the impact force and the axial force of the anchored rockmass are，and the shorter the corresponding action time is. The higher the rockbolt strength，the larger the platform value of the impact force，the shorter the impact time and the larger the slope of impact force attenuation. Rockbolt can significantly enhance the peak strain and improve the tensile strain state of the rock surface. Totally，the strength and the toughness of the rockbolt have a significant impact on the impact resistance of the rock mass. The impact resistance of the rock mass can be improved by improving the strength and the toughness of the rockbolt.
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2020, Vol. 39 
