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Spatial orientation device for rock core in hole and verification method for stress relief method by overcoring

A technology of spatial orientation and positioning device, which is used in earth-moving drilling, surveying, wellbore/well components, etc., can solve problems such as difficult operation, achieve simple operation, simple and easy test method, and is convenient for large-scale popularization and application. Effect

Active Publication Date: 2018-12-18
CENT SOUTH UNIV
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Problems solved by technology

Reasonably arranging the position of the strain gauges is the key point of accurate measurement, and this step is very difficult to operate

Method used

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  • Spatial orientation device for rock core in hole and verification method for stress relief method by overcoring
  • Spatial orientation device for rock core in hole and verification method for stress relief method by overcoring
  • Spatial orientation device for rock core in hole and verification method for stress relief method by overcoring

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Embodiment Construction

[0036]The specific implementation manners of the present invention will be further described below in conjunction with the drawings and examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0037] figure 1 The present invention provides a schematic diagram of a method based on in-hole core marking and orientation technology using casing stress relief method to verify the reliability of original hole core test results, which is suitable for spatial orientation measurement of unbroken core in holes. The device includes a bamboo-style installation rod 1 , a horizontal orientation device 4 , a marking liquid holding box 6 , a high-pressure air pipe 9 , and a thick-walled copper cylinder 11 .

[0038] The rear end of the thick-walled copper cylinder 11 is equipped with a high-pressure air pipe interface 5, and the high-pressure air pipe interface 5...

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Abstract

The invention discloses a spatial orientation device for a rock core in a hole. A thick-walled copper cylinder 11 is equipped with a high pressure air duct interface 5 at the rear end thereof. The high pressure air duct interface 5 is connected with a high pressure air duct 9. A marking liquid holding box 6 is disposed in the thick-walled copper cylinder 11. The rear end of the marking liquid holding box 6 is connected with the high pressure air duct interface 5. The front end of the marking liquid holding box 6 is connected with marking liquid conveying tubes 16. Each marking liquid conveyingtube 16 is provided with a marking liquid nozzle 17 at the tail end thereof. The marking liquid nozzles 17 are sprayed with a waterproof orientation mark having the shape of a Chinese character "Feng". The thick-walled copper cylinder 11 is also provided with a horizontal orientation device 4 at the rear end thereof. Also disclosed is a verification method for the accuracy of a stress relief method by overcoring. In the method, the ground stress test results measured by a wave velocity analysis method, a differential strain analysis method and an AE method are compared with the results measured by the stress relief method, and if the consistency can be verified in many aspects, the accuracy of the test results by the stress relief method can be verified.

Description

technical field [0001] The invention belongs to the technical field of ground stress testing for underground rock mass engineering, and in particular relates to a space direction positioning device for rock cores in holes and a method for verifying the accuracy of casing stress relief methods. Background technique [0002] In-situ stress (also known as original rock stress) is the natural internal stress of the rock mass in the earth's crust. It is the fundamental force that causes the instability and destruction of various underground geotechnical engineering. Accurately grasping its distribution law is the key to realizing underground rock mass engineering decision-making. , The necessary prerequisite for scientific design and construction. The natural stress existing in the rock mass can only be obtained through actual measurement. [0003] Casing stress release method is currently the most mature and widely used ground stress testing technology recognized by the academi...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/10
CPCE21B47/10E21B49/006
Inventor 马春德刘泽霖龙珊郭春志周亚楠
Owner CENT SOUTH UNIV
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