Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for measuring I-type fracture toughness of in-situ rock on site

A fracture toughness, on-site measurement technology, applied in the application of stable tension/pressure to test material strength, instruments, design optimization/simulation, etc. Effect

Active Publication Date: 2022-06-03
TIANJIN UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods are all methods for measuring the fracture toughness of rocks in the laboratory. These methods are difficult to apply in actual engineering, and the method of measuring rock fracture toughness at the engineering site needs further development.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring I-type fracture toughness of in-situ rock on site
  • Method for measuring I-type fracture toughness of in-situ rock on site
  • Method for measuring I-type fracture toughness of in-situ rock on site

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The technical solutions of the present invention will be further described below through the accompanying drawings and embodiments.

[0039] like figure 1 As shown, a method for in-situ measurement of rock type I fracture toughness in situ includes the following steps:

[0040] (1) If figure 2 As shown, select a suitable drilling tool to drill a columnar core connected to the original rock at the bottom of the in-situ rock, for example: the inner diameter of the drilling tool is 10cm, and the drilling depth is 10cm;

[0041] (2) Use epoxy adhesive to connect the top of the rock core with the stretching device;

[0042] (3) Test to obtain the in-situ tensile strength R of the rock;

[0043] (4) Bring the rock tensile strength into the formula

[0044]

[0045] The type I fracture toughness of the rock can be obtained.

[0046] The above are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention. Therefo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for measuring in-situ rock I-type fracture toughness on site, which comprises the following steps of: performing in-situ drawing test on rock on site to obtain the tensile strength of the rock, and calculating the rock I-type fracture toughness by using an empirical formula for calculating the fracture toughness by using the tensile strength of the rock, which is obtained by numerical simulation. According to the method, the aim of testing the I-type fracture toughness of the rock on site is achieved, the method is suitable for testing the I-type fracture toughness in engineering, and the existence of secondary cracks is considered during numerical simulation.

Description

technical field [0001] The invention relates to the field of measurement methods for rock fracture properties, in particular to a method for on-site measurement of in-situ rock type I fracture toughness. Background technique [0002] In all kinds of geotechnical engineering, the failure of rock is mostly involved, and the failure and fracture of rock starts from the expansion of cracks. [0003] Fracture toughness is an important parameter of rock, and it is a physical quantity that describes the ability of rock to resist crack growth. Fracture toughness is numerically equal to the stress intensity factor under the critical condition of crack growth. [0004] At present, scientists at home and abroad have provided many test methods for obtaining rock I-type fracture toughness, such as the V-slit bending specimen (CB) method, the short rod specimen (SR) method, and the Brazilian disc with intermediate V-slot. The test piece (CCNBD) method and the semi-circle disk (SCB) metho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N3/08G06F30/23
CPCG01N3/08G06F30/23G06F2111/10G06F2119/14
Inventor 徐颖付岩赵格立夏开文
Owner TIANJIN UNIV