Abstract
Rock burst support of deep rock mass has always been a difficult problem in geotechnical engineering. Aiming at the problem of rock burst in deep rock mass, a new type of pressure yielding and energy-absorbing bolt system is designed in this paper. The energy absorption characteristics of laminated spring members with different wall thicknesses were studied by the static axial compression test and drop hammer dynamic impact test. The experimental results show that under static axial compression, the laminated spring experiences three stages: elastic, yielding, and plastic strengthening; with the increase in the wall thickness, the energy absorbed by the laminated spring increases gradually. Under the action of impact kinetic energy, with the increase in the wall thickness and impact height, the attenuation time of pressure absorption energy increases, while the tray and nut do not change, and the bolt does not extend and bend. The ANSYS static numerical simulation analysis shows that the center of the top circle of the laminated spring component is the center, and the plastic zone radiates outward; the LS-DYNA numerical simulation shows that most of the impact kinetic energy of the drop hammer is absorbed by the laminated spring component, and the rest is small. The partial energy is borne by the bolt body. Therefore, the laminated spring component can effectively absorb the impact kinetic energy, achieve the effect of active pressure and energy absorption, and avoid the bolt being broken so as to avoid the bolt body bearing all the impact kinetic energy and damage.
Highlights
In frequent coal mine applications involving ground pressure impact, the ordinary anchor rod support system is still typically employed
The anchor rod body material is made from high elongation rate metal, and waxlike wrapping material is added to achieve impact energy absorption
Pan et al.19–22 developed a type of extruding-friction energy-absorbing anchor rod, which has a scitation.org/journal/adv high bearing capacity and a relatively large deformation anchor rod with constant resistance
Summary
Scitation.org/journal/adv high bearing capacity and a relatively large deformation anchor rod with constant resistance. In the event of rock burst, the large deformation of the surrounding rock causes straightening of the bending section on the anchor rod body. This effect can efficiently buffer and relieve the rock burst. The anchor rod support structure can effectively absorb the impact energy due to certain allowable deformations and available space to give your seat to large deformation of surrounding rock provides to reduce has the inclination of percussive ground pressure of roadways in the damage effect.. The assembly can ensure the positive suction effect and regularity, which promotes the usage of coal mines This type of supporting structure is relatively simple. It only requires a common anchor rod support system with laminated spring and damper components, which can greatly increase the safety of the coal mines and further reduce the impact of the economic loss as a result of coal mine pressure related failure
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