Device and method for measuring mechanical properties of rocks

A measuring device and technology of rock mechanics, applied in the direction of measuring device, strength characteristics, using stable tension/pressure to test material strength, etc., can solve the problems of complex operation, large economic consumption, and long experiment cycle

Inactive Publication Date: 2011-10-19
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of complex operation, long test cycle and high economic consumption in the prior art, and provide a relationship between the test force (load) and indentation depth (displacement) at different moments of recording. relationship, a method for deriving the mechanical properties of a series of rock sample materials

Method used

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  • Device and method for measuring mechanical properties of rocks
  • Device and method for measuring mechanical properties of rocks
  • Device and method for measuring mechanical properties of rocks

Examples

Experimental program
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Effect test

Embodiment 1

[0050] 1) This example is to measure the elastic modulus of sandstone. First, calibrate the system stiffness of indenters with different flat head diameters. Aluminum alloy material (Al7049) is used as the calibration material. The mechanical parameters are: E=71.4GPa, v=0.33, elastic yield limit σ y =655MPa, don’t calibrate the system stiffness when the drill diameter is 0.5, 1, 2mm

[0051] 2) Since the particles of sandstone are relatively coarse, a flat-bottomed cylindrical indenter with a diameter of 2m is selected.

[0052] 3) Take 3 groups of sandstone samples, with 5 as a group, the thickness of the rock samples is about 10mm, and the diameter is about 40mm. Different rock samples are distinguished by numbers, which represent different sampling locations. The upper and lower parts are machine ground to be smooth and smooth. Different groups of rock samples are distinguished by numbers, which represent different sampling locations.

[0053] 4) Put the rock sample on t...

Embodiment 2

[0057] 1) This example is to measure the elastic modulus of limestone, as example 1, at first calibrate the system stiffness of indenters with different flat head diameters with known mechanical properties materials such as aluminum alloy.

[0058] 2) Since the particles of limestone are relatively coarse, a flat-bottomed cylindrical indenter with a diameter of 0.5m is selected.

[0059] 3) Take 3 groups of limestone samples, 5 as a group, the thickness of the rock samples is about 10mm, and the diameter is about 40mm. Different rock samples are distinguished by numbers, which represent different sampling locations. The upper and lower parts are machine ground to be smooth and smooth. Different groups of rock samples are distinguished by numbers, which represent different sampling locations.

[0060] 4) Put the rock sample on the sample fixing platform, start the DC motor to start loading, the loading rate is represented by displacement, and the displacement measurement syst...

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Abstract

The invention relates to a device and a method for measurement, in particular to the method for calculating the mechanical properties of a series of rock sample materials by recording relationships between testing forces/loads and indentation depths/displacements at different moments. The device comprises a rack, a DC motor, displacement measurers, a rigid flat-bottom pressure head and a sample fixing station, wherein the rack is divided into two layers; the upper layer of the rack is provided with the DC motor of which one end is connected with the rigid flat-bottom pressure head; the displacement measurers are distributed about the rigid flat-bottom pressure head; and the sample fixing station is fixed on a base of the lower layer of the rack. The reliability and effectiveness of the method can be evaluated by comparing basic rock mechanical property measurement results with those obtained by other conventional testing means. In addition, compared with conventional mechanical test methods such as single-pressing tests, single-pulling tests, triaxial compression tests and the like in laboratories, the method has the advantages of short test process, simplicity and convenience of operation, low requirements on samples, economy and the like.

Description

technical field [0001] The invention relates to a measuring device and a measuring method, in particular to a relationship between the recorded test force (load) and the indentation depth (displacement) at different moments, and to deduce the mechanical properties of a series of rock sample materials. characteristic method. Background technique [0002] In modern geotechnical engineering, the mechanical properties of rock are a very important technical parameter. For example, in the field of oil exploitation, two types of problems are often encountered: the drillability of rock formations and how to select drill bits according to the mechanical properties of rock formations. Currently, the most widely used method is to measure the physical properties of rocks (such as acoustic velocity, porosity, etc.) on site. By referring to the established database of different rock physical properties and mechanical properties, the mechanical properties of the studied rock mass are det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/02
Inventor 王伟徐卫亚谢守益孟庆祥刘桃根
Owner HOHAI UNIV
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