A pressurizing device for bolt pullout experiment simulating surrounding rock stress of anchor

Abstract

A pressurizing device for an anchor rod pull-out test for simulating surrounding rock stress of an anchoring body comprises a rectangular framework with a closed bottom, wherein a bearing cross beam is welded at the top of the framework; a left bearing longitudinal beam and a right bearing longitudinal beam are welded on the left side and the right side of the framework respectively; a sliding beam is connected onto the bearing cross beam; an upper jack is connected onto the sliding beam; an upper loading plate is arranged below the upper jack; a lateral jack is connected onto the right bearing longitudinal beam; a lateral loading plate is arranged on the left side of the lateral jack; a pressure bearing plate is connected onto the left bearing longitudinal beam. The pressurizing device has the characteristics of reasonable design, simple structure, convenience in operation and good loading effect; a phenomenon that in the anchor rod pull-out test, the anchoring body is in a free state and a real surrounding rock stress state cannot be simulated, so that an experimental result has very big deviation from the anchor rod stress in the practical engineering application is overcome; the change condition of the surrounding rock stress can be simulated; and a condition is provided for testing relevant parameters of an anchor rod under the dynamic pressure condition.

Description

technical field [0001] The invention relates to a bolt pulling experiment device, in particular to a pressurizing device for a bolt pulling experiment simulating the surrounding rock stress of an anchor. Background technique [0002] In order to better ensure the safe production of underground mines, effectively support roadways and chamber surrounding rocks, improve the quality of bolt support, and ensure the strength of support, it is necessary to carry out research on the influencing factors of anchor force and the stress transfer and change law of the bonding interface. Research, develop and enrich anchor support technology. It is an important way to study bolt support theory and support technology by using experiments to simulate the actual situation of anchorage, and to study anchorage force and anchorage system through related parameter tests. [0003] There are few existing simulation experimental devices for the anchor pullout test, and most of the anchor pullout t...

AI Technical Summary

Problems solved by technology

In the previous experiments, the anchoring body was in a free state, which led to the inability to simulate the real three-dimensional stress state of the anchored rock mass during the bolt pullout test, which caused a large deviation between the pulling effect and the actual effect; Pulling detection under real conditions can be carried out, but it is often limited by space, safety and other conditions, such as the failure state of the bonded interface of the anchor rod, the distribution and change of shear stress, etc., are difficult to observe and monitor

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