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Abstract
In order to reveal the impact mechanical properties and their key influencing factors of the bolted rock under the lateral impact load, through the lateral drop hammer impact test, the time-history curve of impact force, axial force of the bolt, and surface strain of the sample under different combination types of influencing factors is obtained, and the whole process of deformation and failure of the bolted rock is recorded. The test results show that the material of the bolt has a significant influence on the impact force and axial force of the bolt. There is a positive correlation between bolt strength and impact peak and impact attenuation slope and a negative correlation between bolt strength and impact action time. The effect of prestress on the impact resistance of the bolted rock was also evaluated by the test which suggested that prestress of the bolt can significantly reduce both impact time and bolt axial force of the bolted rock but has limited effect on the impact force. It was also found that the time-history curve of the impact force of anchoring rock mass had significant difference with full-length anchoring and nonanchoring. Compared with the nonanchoring bolt, the full-length anchored rock mass has a larger impact peak and shorter action time, which means that the impact resistance of the full-length bolted rock has a certain degree of weakening. Through scientific research, determining the reasonable bolt material, prestress value, and anchorage style can improve the impact resistance of the sample.
Highlights
With the increase of the intensity and depth of coal mining, accidents due to coal mine rock burst occurred more frequently in China, in recent years
Rock burst was a dynamic phenomenon of the sharp brittle failure of the wall rock with giant sonic thrown out of large quantity of rock or coal
In order to solve the problem of rock burst disaster in the mining roadway, microseismic monitoring, acoustic monitoring, electromagnetic monitoring, coal pillar stress, optimizing the layout, crisis relief, and support have been developed to deal with the early warning and prevention of disasters, respectively [6–10]
Summary
With the increase of the intensity and depth of coal mining, accidents due to coal mine rock burst occurred more frequently in China, in recent years. In order to solve the problem of rock burst disaster in the mining roadway, microseismic monitoring, acoustic monitoring, electromagnetic monitoring, coal pillar stress, optimizing the layout, crisis relief, and support have been developed to deal with the early warning and prevention of disasters, respectively [6–10]. These methods are difficult to be carried out for controlling rock burst effectively because the mechanism, place, and time of rock burst cannot be predicted in advance. The lateral drop hammer impact tests of the bolted rock with different materials, different prestress levels, and different anchorage styles are tested by using the drop hammer impact test device to study the dynamic mechanical response laws of the bolted rock under different impact loads, the research results of which can be used to provide test data for the parameter selection of rock bolt support in the rock burst roadway
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