A method and equipment for making multi-scale and multi-shape rock fractures with controllable roughness

A technology of rock fissures and roughness, applied in the field of rock mechanics experiments in civil engineering, can solve problems such as uncontrollable fissure roughness, and achieve the effect of controllable roughness and improved success rate

CN106153422BActive Publication Date: 2018-10-19SHAOXING UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-10-19

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Abstract

The invention relates to a roughness-controllable method for producing multi-scale and multi-shape rock fracture. The method comprises the steps of putting a rock block with two sides preformed with grooves on a base plate, putting a clamp on the top of a test piece, starting a vertical loading device, applying a normal stress to the test piece according to the requirement, after the test piece is stabilized, starting a pushing device to push a transverse loading device to be in front of the test piece but not in contact with the test piece, fixing the transverse loading device, starting the transverse loading device to press cone-shaped loading heads into the grooves, after reaching a certain stress according to the requirement, keeping the stress constant, and finally removing the normal stress according to a required removing velocity, so as to obtain the fracture. The invention further provides equipment for realizing the method. According to the method and the equipment, the roughness of the fracture can be effectively and precisely controlled, the success rate is high, and the effect is ideal; and the method and the equipment can be applied to multi-scale and multi-shape test pieces.
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Description

technical field

[0001] The invention belongs to the field of civil engineering rock mechanics experiments, in particular to a method and equipment for making multi-scale and multi-shaped rock fissures. Background technique

[0002] The formation of natural rock mass needs to go through a complex and lengthy process. Due to different geological causes, the rock mass has undergone multiple tectonic movements, resulting in structural deformation and rupture, destroying the continuity and integrity of the rock mass. . The above actions will form many discontinuous structures such as joints and fissures inside. The fractured rock mass is rich in various defects, including macroscopic discontinuities such as microcracks, pores, and joint fissures. Under complex underground environments, these rocks Mass fractures significantly affect the mechanical properties and permeability characteristics of rock mass.

[0003] With the development of the economy, geotechnical projects such a...

Examples

example 1

[0052] Example 1: A method for making multi-scale and multi-shaped rock fractures with controllable roughness, taking a granite cube specimen with a side length of 400mm as an example, including the following steps:

[0053] Step 101: First, select a backing plate 15 with a side length of 400 mm and a fixture 3 with a side length of 400 mm according to the size of the specimen

[0054] Step 102: Stack the backing plates to ensure that the centerline of the test piece is on the centerline of the lateral loading device.

[0055] Step 103: Make a groove of 10mm×10mm×400mm at the center line of both sides of the test piece.

[0056] Step 104: Stack and place fixture 3 on top of the test piece, start vertical loading device 4, apply pressure at a rate of 0.5 MPa / min, and apply a normal stress of 20 MPa to the test piece according to the required crack roughness.

[0057] Step 105: After the normal stress is stabilized, start the lateral pushing device, push the lateral loading dev...

example 2

[0060] Example 2: A method for making multi-scale and multi-shaped rock fractures with controllable roughness, taking the vertical placement of a cylinder with a diameter of 200mm and a height of 400mm as an example, including the following steps:

[0061] Step 201: First, select a circular backing plate 15 with a diameter of 200 mm and a circular fixture 3 with a diameter of 200 mm according to the size of the test piece

[0062] Step 202: Stack the backing plates to ensure that the centerline of the test piece is on the centerline of the lateral loading device.

[0063] Step 203: Make a groove of 10mm×10mm×125mm at the center line of both sides of the test piece.

[0064] Step 204: Stack and place the fixture 3 on the top of the specimen, start the vertical loading device 4, pressurize at a rate of 0.5 MPa / min, and apply a normal stress of 15 MPa to the specimen according to the required crack roughness.

[0065] Step 205: After the normal stress is stabilized, start the la...

example 3

[0068] Example 3: A method for making multi-scale and multi-shaped rock fractures with controllable roughness, taking the lateral placement of a cylinder with a diameter of 200mm and a height of 400mm as an example, including the following steps:

[0069] Step 301: First, according to the size of the test piece, select a backing plate 15 with a side length of 160 mm and an arc-shaped diameter of 200 mm and a fixture 3 of the same size.

[0070] Step 302: Stack the backing plates to ensure that the centerline of the test piece is on the centerline of the lateral loading device.

[0071] Step 303: Make a groove of 10mm×10mm×400mm at the center of the two sides of the test piece.

[0072] Step 304: Stack and place the fixture 3 on the top of the test piece, start the vertical loading device 4, pressurize at a rate of 0.5 MPa / min, and apply a normal stress of 15 MPa to the test piece according to the required crack roughness.

[0073] Step 305: After the normal stress is stabiliz...