Indoor stretching-shearing testing device for anchor rod

Abstract

The invention relates to an indoor stretching-shearing testing device for an anchor rod, belonging to the technical field of geotechnical engineering. The device comprises a counterforce frame, a horizontal loading system, a lower shearing box, a vertical loading system, a horizontal guide rail system, an upper shearing box and a limit device. Due to the structure design of the horizontal guide rail system, the shearing movement of the upper shearing box along the horizontal loading direction is realized and a friction resistance in a shearing process can be effectively reduced. A first vertical loading jack and a second vertical loading jack in the vertical loading system are connected with the same hydraulic control system, thus a test anchor rod can always bear a vertically upward axial stretching force in the vertical loading process. By the indoor stretching-shearing testing device for an anchor rod, a shearing damage test of the anchor rod under different axial drawing forces can be realized and the defect that a conventional indoor stretching-shearing testing device for an anchor rod is only capable of performing a pure-stretching test is overcome; and the indoor stretching-shearing testing device for an anchor rod is of great importance in acquiring stretching-shearing damage test data of the anchor rod and understanding a damage mechanism of the anchor rod under a stretching and shearing comprehensive function.

Description

technical field [0001] The invention relates to an indoor tension-shear test device for anchor rods, which belongs to the technical field of geotechnical engineering. The device is mainly used in the indoor test research on the failure behavior of anchor rods under the combined action of tension and shear. Background technique [0002] Bolt support is an economical and efficient surrounding rock reinforcement method commonly used in surface engineering such as tunnels and slopes and underground engineering such as stopes and roadways. The reinforcement effect of the bolt on the surrounding rock is mainly reflected in the mechanical behavior of the two aspects of the bolt: (1) Axial anchoring effect: After the rock mass is excavated and unloaded, the surrounding rock deforms into the excavation space, and the bolt hinders the surrounding rock The axial anchoring force is generated by the deformation of the rock. Because the anchor rod has good pull-out resistance, it forms a ...

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have done more research on the failure mechanism of anchors under pure tension, but there are very few studies on the failure behavior of anchors under combined tension and shear. The main reason is the lack of indoor tests that can meet the requirements. Device, that is, a test device that can reasonably simulate the tensile-shear failure process of anchor rods and can provide both tensile and shear forces

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