Coordinated-deformation energy-absorption anchor rod suitable for mining high-stress large-deformation rock mass

Abstract

The invention discloses a coordinated-deformation energy-absorption anchor rod suitable for mining a high-stress large-deformation rock mass. The rod body of the anchor rod mainly comprises an elongated anchoring section straight rod body (1) and an energy-absorption section bending rod body (2), wherein one end, close to the energy-absorption section bending rod body, of the rod body is provided with a threaded section (5); a fastening nut (4) is screwed on the threaded section (5); and a steel pallet (3) is sleeved between the fastening nut (4) on the threaded section (5) and the energy-absorption section bending rod body. The anchor rod is mainly characterized in that: a wavelike bending energy-absorption section in a specific length and a specific shape is mechanized on a long straight threaded steel rod body in a heat treatment mode; the energy-adsorption section restrictively allows a wall rock to deform properly and simultaneously absorb the deformation energy of the rock mass until reaching total allowable deformation quantity meeting a design requirement. In the process, the supporting force of the anchor rod is increased gradually; and finally, after the bending section is completely straightened and a yielding effect controlled by a high-stress roadway ground pressure is achieved, the anchor rod becomes a high-strength rigid resin anchor rod for providing greater supporting force for a supported wall rock mass.

Description

technical field [0001] The invention relates to a mining bolt, in particular to a mining coordinated deformation energy-absorbing bolt suitable for high-stress and large-deformation rock mass, belonging to the technical field of ground pressure control and roadway support in underground mines. Background technique [0002] Bolt support technology has a history of more than 100 years, and has become a relatively new type of support technology commonly used in underground engineering construction. Bolt support has many advantages: it can significantly improve the roadway support effect, increase safety, save steel, reduce support costs, reduce labor intensity, improve the underground operating environment, and low maintenance costs, easy construction, etc. At present, rigid bolts (such as threaded steel bolts) are often used in shallow underground hard rock mines, and anchored with mortar or resin. This kind of bolt has high rigidity and high support strength, but has little d...

AI Technical Summary

Problems solved by technology

Similarly, although ductile anchors such as pipe-slotted anchors can provide large deformation, they cannot meet the support strength under high stress, and often cause fractures and failures due to excessive internal stress in the rock mass.

Images