Mold for rock-like sample containing complex joints and sample preparing method

Abstract

The invention discloses a mold for a rock-like sample containing complex joints and a sample preparing method. The mold comprises a frame, a drawable rotating disc, thin embedded sheets and a joint insert sheet, wherein the frame comprises a bottom plate and two side plates vertically fixed on two long sides of the bottom plate; the two thin embedded sheets are perpendicular to two short sides ofthe bottom plate and connected with the side plates, and five faces of a cuboid are formed by the thin embedded sheets and the frame; round holes are formed in the thin embedded sheets; the drawable rotating disc comprises a rotating body, a handle and an insert plate, the diameter of the rotating body is equal to that of each round hole, one end of the rotating body is connected with the handle,the other end of the rotating body is connected with the insert plate, and the insert plate penetrates the round holes and is located in the frame; the joint insert sheet is connected with the insertplate and has different shapes. Rock-like material samples with different penetration rates, different inclinations and different fracture shapes can be prepared with the mold.

Description

Technical field [0001] The invention belongs to the field of rock mechanics and rock engineering, and specifically relates to a rock-like sample mold containing complex joints and a sample preparation method. Background technique [0002] Jointed rock mass is a complex rock mass frequently encountered in water conservancy and hydropower engineering, tunnel engineering, and mining engineering. The rock mass contains natural weak surfaces of different scales. Under the action of geological movement, these existing weak surfaces will close, open, expand or cause new fractures in the rock. Compared with complete rock masses, the mechanical properties of jointed rock masses are largely determined by these weak structural surfaces. When groundwater flows in a jointed rock mass, the characteristics of the joints, such as angle and penetration rate, affect the mechanical and hydraulic properties of the jointed rock mass to a certain extent. [0003] The simulation experiment method to st...

AI Technical Summary

Problems solved by technology

[0004] The current method for making specimen models with joints and cracks is mainly the one-time molding method, and the one-time molding method needs to insert plastic plates and other sheets at the designed joint positions to make joints after the mixed materials are poured into the test mold. More cumbersome, generally only one sample can be made at a time

Because it is not easy to control the angle and penetration rate of each sample joint sheet, there are often large errors in data analysis

[0005] Chinese patent document 201510587631.2 discloses the prefabrication of rock-like specimens with standard roughness joint surfaces, but this method is not suitable for the preparation of rock-like specimens with complex joints

Chinese patent document 201220173136.9 discloses a mold for making standard specimens of fractured rock materials at different angles. The mold controls the angle of prefabricated cracks by setting a number of inclined guide grooves. However, the number of inclined guide grooves is limited, and various angles cannot be realized. prefabricated cracks

Chinese patent document 201521041507.8 discloses a mold for making jointed specimens. However, the rotating disc is located at the bottom, which is inconvenient for rotating operation, and the width of the joint sheet is smaller than the width of the joint socket, which may cause liquid leakage.

[0006] At present, a type of rock sample mold can only produce samples of a single type of crack. Therefore, there is an urgent need for molds and methods that can produce rock-like material samples with different penetration rates, different inclination angles, and different crack shapes, which can be conveniently and quickly controlled. Penetration rate, inclination and crack shape to improve production efficiency

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