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Method for prefabricating rough fractures in rocklike similar material specimen

A technology of rock similarity and rock test pieces, applied in the preparation of test samples, etc., can solve the problems of cracks that are difficult to repeat accurately, and achieve the effects of low cost, simple processing procedures, and convenient accurate quantification and comparative analysis

Active Publication Date: 2015-08-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0011] In addition, some scholars use methods such as shear test and Brazilian splitting test to directly form rough fracture surfaces in rock samples, and then conduct related research (such as R.E. Goodman, 1976), but the cracks formed by this method are difficult to repeat accurately. For a medium with large discreteness like rock, this is a defect that cannot be ignored

Method used

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  • Method for prefabricating rough fractures in rocklike similar material specimen
  • Method for prefabricating rough fractures in rocklike similar material specimen
  • Method for prefabricating rough fractures in rocklike similar material specimen

Examples

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Embodiment 1

[0056] (1) Use a coring machine to take samples from the collected rocks, and obtain a standard cylindrical sample through cutting, grinding and other processes

[0057] (2) A fractured rock sample 1 containing a single penetrating rough crack 5 is obtained through an angle die compression shear test;

[0058] (3) Cut the aluminum foil paper 6 into a rectangle of 170mm×100mm and a circle with a diameter of 60mm, wrap the side of the cracked cylindrical sample with rectangular aluminum foil, keep the opening of the cracked surface at 2mm, wrap the circle with high temperature resistant glue Paste the aluminum foil paper on the lower surface of the sample, and paste the overlapping parts of the aluminum foil paper together to ensure a good seal;

[0059] (4) Put the cylindrical sample wrapped by aluminum foil into the box-type high-temperature furnace 2 and heat to 240°C;

[0060] (5) Use a high-temperature furnace to melt metal tin into a liquid state with a melting point of...

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Abstract

The invention relates to a method for prefabricating rough fractures in a rocklike similar material specimen and belongs to experimental methods of rock mechanics. The method comprises the following concrete steps: processing a rock specimen, and carrying out a destruction test with a testing machine, so as to obtain a fractured rock specimen containing a single rough through fracture; then, wrapping the fractured rock specimen with a flexible high-temperature-resistant coil, filling the rough fracture with liquid compound materials at high temperature, and naturally cooling; removing the flexible high-temperature-resisting coil, so as to obtain a compound material fracture piece; digitizing the surface appearance characteristic of the compound material fracture piece with a three-dimensional laser scanner; fixing the compound material fracture piece into a specimen processing mould, and then pouring flowable rocklike similar materials; after a similar material specimen is hardened, demoulding and heating so as to enable the compound material fracture piece to be melted to flow out; cooling, so as to obtain the rocklike material specimen containing rough joints. The method has the characteristics of being simple in process, low in cost, good in repeatability and high in precision and has a wide application prospect in a physical and mechanical property test of rock structure planes.

Description

technical field [0001] The invention relates to a rock mechanics experiment method, in particular to a method for prefabricating rough cracks in test pieces of similar rock-like materials. Background technique [0002] In the field of rock mechanics, a rock mass is recognized as consisting of a network of rock blocks and fractures (joints, structural planes or discontinuities). The physical and mechanical properties of fractures are the controlling factors of rock mass bearing capacity and engineering stability, so fractured rock mass has always been a research hotspot in the academic circles. According to the mechanical origin, cracks can be divided into two types: shear and tension. Generally speaking, the crack surface is relatively rough. In 1973, the Barton system proposed the concept of joint surface roughness, and determined the roughness coefficient JRC through experiments. In addition, Xie Heping's research on fractal geometry also provides a method for determini...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 蔚立元靖洪文朱谭谭杨二鹏
Owner CHINA UNIV OF MINING & TECH
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