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Soft rock large deformation three axis creep test transverse strain measuring extensometer and method

A three-axis creep and strain measurement technology, which is applied in the fields of electric/magnetic solid deformation measurement, electromagnetic measurement device, soil material testing, etc., to achieve the effect of simple structure, easy manufacture and easy mastery

Inactive Publication Date: 2008-07-16
SICHUAN 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 deficiencies of the prior art, to provide an extensometer and a lateral strain measurement method for measuring the lateral large deformation of the soft rock triaxial creep test, so as to accurately measure the soft rock test at each stage during the test process. kind of transverse strain

Method used

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  • Soft rock large deformation three axis creep test transverse strain measuring extensometer and method
  • Soft rock large deformation three axis creep test transverse strain measuring extensometer and method
  • Soft rock large deformation three axis creep test transverse strain measuring extensometer and method

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Embodiment 1

[0030] In this embodiment, the structure of the extensometer is shown in Figure 1, Figure 2, and Figure 3, including a slip ring 1, a bracket 2, an extension arm 3, a contact 4, a spring hook 5, a sensitive element 6, a positioning pin 7, a hinge Shaft 8 and spring 9. Slip ring 1 is one, and its inner diameter is 1mm larger than the outer diameter of the upper and lower indenters after maximum deformation (according to the elastic constant of the upper and lower indenters and the maximum load of the testing machine, the maximum radial deformation of the upper and lower indenters is 0.5 mm), the axial height is 10mm, the wall thickness is 2mm, the production material is aluminum alloy or titanium alloy; the support 2 is two sets, the structure is a rectangular tubular structure, the production material is aluminum alloy or titanium alloy, and the hinge shaft 8 is installed on it It is also provided with an extension arm positioning hole 10, and the two brackets are symmetricall...

Embodiment 2

[0033] In this embodiment, the structure of the extensometer is shown in Figure 4, and the differences from Embodiment 1 are: (1) the inner diameter of the slip ring 1 is 0.5mm larger than the outer diameter of the upper and lower indenters after maximum deformation, The axial height is 5mm; (2) the shape of the two extension arms 3 is a circular rod-shaped body; (3) the elastic body 11 constituting the sensitive element 6 is a flat sheet-shaped body, as shown in Figure 7 and Figure 8, the installation , one end of the elastic body 11 is fixed on the bottom backing plate of the bracket 2, and the other end of the elastic body 11 is fixed on the hinged end of the extension arm 3 hinged with the bracket, as shown in Figure 4 .

Embodiment 3

[0035] In this embodiment, three sets of extensometers with different extension arm lengths described in Embodiment 1 are used to simultaneously measure the lateral strain of three sections of soft rock, and the installation method is shown in Figure 9; before the formal test, the strain gauge and the standard The displacement meter calibrates the extensometer to obtain the relationship between strain and displacement.

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Abstract

An extensometer of the transverse strain measurement of a soft rock three-shaft creep test includes a slide ring, two pairs of supporters, two strips of extension arms, two sense elements and two springs. The inside diameter of the slide ring is larger than an outside diameter of an upper pressure head and a lower pressure head after a maximum deformation; the supporters are symmetrically arranged on two sides of the external ring surface of the slide ring; one ends of the two extension arms are hinged with one pair of supporters and the other end is provided with a contact terminal and a spring hook; one ends of the two sense elements are respectively fixed on two supporters and the other end is fixed at the end part of the hinged end of the extension arms hinged with the supporters; the two ends of the two springs are respectively connected with the spring hooks arranged on the two strips of extension arms; the hinged end between the two supporters and the two extension arms is provided with an extension arm locating hole and allocated with a locating pin. A method of the transverse strain measurement of a soft rock three-shaft creep test uses the extensometer of the structure for measuring and the quantity of the extensometer is equal to the quantity of the section to be detected of a soft rock sample.

Description

technical field [0001] The invention belongs to a transverse strain measuring instrument and method of a test piece, in particular to an instrument and a method for measuring the transverse strain of a soft rock test piece. Background technique [0002] Soft rock is a kind of rock with large deformation. Since there are no strain gauges and extensometers that can measure the strain of more than 20%, in the triaxial test under constant confining pressure, the measurement of large lateral deformation of soft rock is generally carried out. The following two methods: (1) Indirect measurement method, by measuring the volume change of the rock sample (that is, measuring the discharge of oil in the pressure chamber) and the axial deformation, the lateral deformation of the soft rock is calculated. (2) Measure the final transverse deformation of the sample after the test is completed. The problems of the above two methods are: the former measures the average lateral deformation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N3/28G01B7/16
Inventor 徐进刘建锋谢和平
Owner SICHUAN UNIV
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