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Preparation device and preparation method of blind joint-containing rock-like sample

A rock sample and preparation device technology, which is applied in the fields of civil engineering and hydropower engineering, can solve problems such as the inability to prepare samples with hidden joints, and achieve the effects of high conformity, avoidance of damage, and simple operation

Active Publication Date: 2017-05-31
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In view of the problem that the existing rock sample preparation method can only prepare through or partially through joint samples, but cannot prepare samples with hidden joints, the present invention provides a kind of rock sample preparation device with hidden joints, and based on The device provides a preparation method for a rock-like sample containing hidden joints; the hidden joint samples produced by the preparation device and the preparation method can accurately describe the basic characteristics of the jointed rock mass such as the dip angle, connectivity rate, quantity and spacing of the hidden joints

Method used

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  • Preparation device and preparation method of blind joint-containing rock-like sample
  • Preparation device and preparation method of blind joint-containing rock-like sample
  • Preparation device and preparation method of blind joint-containing rock-like sample

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of sandstone-like samples with hidden joint dip angle α1=45°, connectivity rate k1=22.4%, number n1=2, distance D1=2cm includes the following steps:

[0035] 1) Using 3D printing technology, two detachable semi-cylindrical molds are made of resin materials, and then the two semi-cylindrical molds are fixed together with two metal strips with bolts to form a standard cylindrical mold with a size of Φ50 ×100;

[0036]2) A thin tin sheet is used to simulate hidden joint fissures. The thickness of the tin sheet is 0.1mm. The tin sheet is cut into an ellipse with a long axis a=2cm and a short axis b=1cm, so that the connection rate of the formed joint k1=22.4% ;

[0037] 3) Adjust the hidden joint sample preparation device so that the scale β=45° on the arc-shaped support frame 7 corresponding to the position of the bottom plate 1 is fixed, then the hidden joint inclination angle is α=90°-45°=45°, and then The standard mold prepared by step 1) is put into the c...

Embodiment 2

[0044] Preparation of sandstone-like samples with hidden joint dip angle α2=60°, connectivity rate k2=67.2%, number n2=3, distance D2=1cm includes the following steps:

[0045] 1) After demolding the sample in Example 1, the mold can be reused after cleaning. Same as embodiment 1, two semi-cylindrical molds are fixed together with two metal strips with bolts to form a standard cylindrical mold.

[0046] 2) A thin tin sheet is used to simulate hidden joint fissures. The thickness of the tin sheet is 0.1mm. In this example, the joint connectivity rate k2=67.2%, so the tin sheet is cut into an ellipse with a long axis a=3cm and a short axis b=2cm ;

[0047] 3) Adjust the hidden joint sample preparation device so that the scale β on the arc-shaped support frame 7 corresponding to the position of the bottom plate 1 is fixed at 30°, then the hidden joint inclination angle is α=90°-30°=60°, and then Put the standard mold prepared in step 1) into the sample holder;

[0048] 4) Prep...

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Abstract

The invention discloses a preparation device and a preparation method of a blind joint-containing rock-like sample. The device comprises a bottom plate and a mold support system, wherein the support system comprises a first support plate and a second support plate which are vertically connected; a size scale is arranged on the first support plate and a first baffle plate and a second baffle plate are arranged at the upper part of the first support plate; the first support plate is connected with the first baffle plate through the second baffle plate to from a cylindrical chamber for placing a rock sample preparation mold; and the connected part of two support plates is hinged with the bottom plate, so that the mold support system can drive the cylindrical chamber to rotate and to form any angle together with the bottom plate to simulate dip angles of blind joints. The preparation method of the rock sample is carried out by using the device, the mold is put into the cylindrical chamber, the support system is adjusted to the to-be-simulated dip angles of the blind joints, tin flakes capable of forming the blind joint are distributed and poured into the mold and put at the corresponding position for low-temperature treatment, and the rock sample which is capable of really reflecting the joint variables of the dip angles, the connection rate, the quantity and the intervals of the blind joints can be finally prepared.

Description

technical field [0001] The invention relates to a preparation device and a preparation method of a rock-like sample, in particular to a preparation device and a preparation method of a rock-like sample with hidden joints, and belongs to the fields of civil engineering and hydropower engineering. Background technique [0002] Joints and fissures of various scales are ubiquitous in engineering rock mass, and the joints and fissures have a significant impact on the mechanical properties of rocks, and the instability and failure of rocks are also closely related to these joints and fissures. Especially under the high-pressure seepage caused by high head pressure, the seepage stress coupling mechanical properties of rock mass are directly related to the long-term stability and safety evaluation of the project. The research on the engineering properties of jointed rock mass has become a hot spot. [0003] However, it is difficult to drill natural rock samples with joints and fiss...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/42
CPCG01N1/28G01N1/42
Inventor 王环玲向志鹏徐卫亚李跃赵恺王苏生林志南夏季
Owner HOHAI UNIV
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