A New Yielding Bolt for Rock Support in High Stress Rock Masses

Abstract

High stress in the surrounding rock mass causes serious stability problems. The applied support system used in this conduction should be able to carry high loads and also accommodate large deformations without experiencing serious damage. In this paper, a brief overview of the history of yielding/energy-absorbing rock bolts is provided. And then, a new yielding bolt invented by the author is introduced in detail, including its layout and principle. Theoretical analysis shows that the bolt has large load-bearing and deformation capacities, thereby absorbing a large amount of energy to maintain the stability of surrounding rock.

Review on Rockburst Theory and Types of Rock Support in Rockburst Prone Mines

“…The untimely failure of the rebar bolts (Figure 3), indicates that a rebar is too stiff to withstand rock dilations in high stress rock masses [15]. To withstand large rock dilations, Split Sets are used as reinforcement devices in many deep mines.…”

“…Operations of the bolt involve the metal being pushed through a die by tension applied at the end of the die. The elastic movement is sorely due to compression, from the metal with the die [15] [23].…”

“…In addition to the continuous resistance and the large deformation, the effect of bolt operation is an increase in the rod's tensile strength. Upon installation, suitable pre-stress is enforced to support the rock mass this enhances the supporting effect considerably [15] [23].…”

Large Deformation Control Principle and Reinforcement Technique for Solid Coal Rib of Large-Section Gob-side Tailentry in Thick Coal Seam buried Deeply

“…The bolt-mesh-anchor is often adopted for the gob-side tailentry in deep mines recently [1][2][3][4] ,but good effects are not obtained in fact. So it is necessary to research the control strategy and reinforcement technique for solid coal rib in large-section gob-side tailentry of deep fully-mechanized caving face.…”