A cantilever bending test device for rock slab samples

Abstract

The invention discloses a rock beam sample cantilever type bending test device, and belongs to the technical field of rock beam bending test equipment. The device comprises a supporting platform and a loading component and further comprises a pressing component and a data collecting component; the pressing component comprises an upper pressing block, a lower pressing block, a first screw, a second screw, a first rotary wheel and a second rotary wheel; the loading component comprises a load support, a contact block and a balance weight sheet, vertical clamping grooves are formed in the two sides of the load support, the two ends of the contact block are connected with clamping strips respectively, a limiting groove is formed in the contact block, the balance weight sheet is arranged in the limiting groove, and the load support is in sliding connection with the supporting platform. The data collecting component comprises a magnetic gauge stand, an electronic dial indicator, a data collector and a strain gage, and the strain gage is connected with the data collector. Rock beam cantilever type loading is adopted, aiming at an anti-dip bedded rock slope, the testing accuracy of the device is greatly improved, and reference can be provided for study of the stability of the anti-dip bedded rock slope in water and electricity slope engineering.

Description

technical field [0001] The invention relates to the technical field of rock slab bending test equipment, in particular to a bending mechanical response test device for single-layer or multi-layer composite rock slab samples under cantilever stress conditions, which is suitable for hydropower slope engineering Study on Stability of Anti-dipping Layered Rock Slopes. Background technique [0002] In hydropower slope engineering, it is very important to study the stability of anti-inclined layered rock slopes, especially for the specific problem of determining the tensile mechanical properties of rock slabs where the fracture surface of anti-inclined layered rock slopes develops . [0003] During the process of slope formation, such as high and steep anti-inclined slopes formed by downcutting in river valleys, and anti-inclined engineering slopes formed by excavation, the unloading and rebound effect redistributed the stress in the shallow slope body, and the stress state becam...

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Problems solved by technology

[0008] The loading device disclosed in this patent document for monitoring the change of lateral pressure in the bending test of rectangular slabs can realize bending tests of a single thick plate, a single thin plate, and various combinations of thick plates and thin plates under uniform load conditions. At the same time, it can monitor Rock slab bending deformation and changes in lateral force during failure; however, the same field of application is mine development engineering, and the research is on the deformation and failure process and catastrophe mechanism of the shallow goaf roof, especially for the specific problem of how reasonable To determine the safety isolation thickness of the roof of the underlying mined-out area, the improved three-point bending model is still used for loading. There are still differences in the stress state at the fracture surface of the anti-dip slope rock slab, which is not suitable for anti-dip layered rocks. Slope Test

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