Device and method for manufacturing rock joints with different roughness

Abstract

The invention discloses a device and method for manufacturing rock joints with different roughness, relates to the technical field of geotechnical engineering, and can be used for manufacturing jointsurfaces with different roughness of a cubic rock sample. The device comprises an upper pressing plate and a lower pressing plate which are used for transmitting loads; V-shaped grooves correspondingto each other up and down are formed in the middles of the upper pressing plate and the lower pressing plate, the pressing strips are clamped and placed on the V-shaped grooves, the lower pressing plate is further provided with at least four spring fixing holes, the springs are arranged in the spring fixing holes, and the height of the springs exposed out of the spring fixing holes is larger thanthat of the pressing strips exposed out of the V-shaped grooves. The pressing strips are quadrangular prisms, one side edge of each pressing strip is a rough edge, a limiting column is arranged on theside face of the upper pressing plate, a guide column is arranged on the side face of the lower pressing plate, and the limiting column and the guide column are matched with each other to guarantee relative parallel movement of two planes where the upper pressing plate and the lower pressing plate are located. Fresh joint surfaces with different roughness can be formed by matching two identical pressing strips with the split rock, so that the mechanical property research of the joint rock mass with different roughness characteristics is facilitated.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a device for making rock joints with different roughnesses and a method for making rock joints with different roughnesses by using the device. Background technique [0002] Rock mass is a typical natural geological body, formed after millions of years or even hundreds of millions of years of geological history. Rock mass has the characteristics of heterogeneity, discontinuity, anisotropy, etc., and rock mass is often composed of complete rock blocks and discontinuous geological structures that cut rock blocks (such as faults, structural planes, joint planes, bedding, etc. )composition. Due to its extremely low shear strength and high permeability characteristics, weak surfaces such as joint surfaces become an important factor determining the overall stability of rock mass engineering. Therefore, the research on geometric properties, mechanical properties and pe...

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Problems solved by technology

[0011] However, the existing manufacturing methods have the following problems: ①Similar materials often have low strength and weak brittleness, and rock is a typical brittle material, so model materials such as mortar and gypsum cannot truly reflect the mechanical characteristics of rock; prefabricated joint surfaces The morphology (such as sawtooth) is also quite different from that of natural joints; ② rock is a natural geological body, and the surface of rock joints usually has complex three-dimensional morphology characteristics, and the joints prepared by cutting rocks cannot truly reflect the original rock The real three-dimensional shape of the joint surface; ③ Although the most realistic joint surface can be obtained by collecting samples on site, the cost of on-site sampling is high and the success rate is low. Processing rocks with natural joint samples is very easy to cause damage to natural rock samples. Disturbance, changing its inherent structure and then affecting the measured mechanical parameters; ④The appearance of the joint surface carved by the 3D engraving machine is smoother than that of the original rock joint surface, which cannot replicate the tiny undulations on the original rock joint surface; ⑤Split formation The joint surface of the rock has complex three-dimensional shape characteristics, which is similar to the shape of the fresh joint surface on the spot. However, in the process of splitting, a straight steel wire strip or a prismatic steel strip is generally used to apply a line load on the surface of the cubic rock. The surface morphology cannot be controlled artificially, and the surface morphology formed by splitting is relatively similar, and the roughness is single, so it is impossible to make rock joint surfaces with different roughness characteristics

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