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Drilling non-destructive sampling method for deep-buried rock

A non-destructive sampling, deep-buried rock technology, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of core sample damage, decrease in rock strength, unable to represent rock strength, etc., to eliminate damage and ensure mechanical properties. Effect

Active Publication Date: 2009-12-16
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] The construction of deep buried projects requires rock sampling under deep buried conditions. The commonly used sampling methods include drilling sampling (core samples) and rock sampling (on-site rock blocks). Because new cracks may appear after the excavation of deep buried tunnels , The strength of the rock has also dropped significantly. These two sampling methods are not a reflection of the quality of the original rock mass, and there is a serious problem of core sample damage, that is, the rock test results cannot represent the strength of the rock under the original condition. huge influence

Method used

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  • Drilling non-destructive sampling method for deep-buried rock

Examples

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Effect test

Embodiment 1

[0017] Embodiment 1: as figure 1 As shown, the specific steps of this embodiment include,

[0018] a. Select the location to be sampled on site, and use a large-sized drill hole to take out the core A1 with a diameter larger than the actual sample diameter. The drill hole diameter is 130 mm, and the drill hole depth is greater than the secondary stress of the surrounding rock in the cavern. In principle, usually greater than 10m-20m after 1 times the hole diameter;

[0019] b. After obtaining the on-site core A, select the core beyond the obvious disturbance zone of the secondary stress of the surrounding rock in the cavern (usually more than one time the diameter of the cave) for casing drilling. In this example, the core obtained in step a A1 was cut off, and the part of the core whose length was more than 1 times the hole diameter was fixed and drilled with conventional equipment to obtain core B2. The diameter of the drill hole was 46 mm, and the core length was 92 mm.

Embodiment 2

[0020] Embodiment 2: as figure 1 As shown, the specific steps of this embodiment include,

[0021] a. Select the location to be sampled on site, and use a large-sized drill hole to take out the core A1 with a diameter larger than the actual sample diameter. The drill hole diameter is 130 mm, and the drill hole depth is greater than the secondary stress of the surrounding rock in the cavern. In principle, usually greater than 10m-20m after 1 times the hole diameter;

[0022] b. After obtaining the on-site core A, select the core beyond the obvious disturbance zone of the secondary stress of the surrounding rock in the cavern (usually more than one time the diameter of the cave) for casing drilling. In this example, the core obtained in step a A1 was cut off, and the core with a length of more than 1 times the hole diameter was fixed and drilled with conventional equipment to obtain core B2. The diameter of the drill hole was 59 mm, and the core length was 118 mm.

Embodiment 3

[0023] Embodiment 3: as figure 1 As shown, the specific steps of this embodiment include,

[0024] a. Select the location to be sampled on site, and use a large-sized drill hole to take out the core A1 with a diameter larger than the actual sample diameter. The drill hole diameter is 150 mm, and the drill hole depth is greater than the secondary stress of the surrounding rock in the cavern. In principle, usually greater than 10m-20m after 1 times the hole diameter;

[0025] b. After obtaining the on-site core A, select the core beyond the obvious disturbance zone of the secondary stress of the surrounding rock in the cavern (usually more than one time the diameter of the cave) for casing drilling. In this example, the core obtained in step a A1 was cut off, and the core with a length of more than 1 times the hole diameter was fixed and drilled with conventional equipment to obtain core B2. The diameter of the drill hole was 59 mm, and the core length was 118 mm.

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Abstract

The invention relates to a drilling non-destructive sampling method for deep-buried rock. The technical problem is to provide the drilling non-destructive sampling method for the deep-buried rock which has convenient construction and is mainly applicable to the condition of unprominent contraction of stress level and rock damage strength so as to solve the perturbation problem during the rock sampling of deep burying engineering and avoid the damage of core. The technical proposal comprises the steps of: a, selecting the position where the sampling needs to be performed on site, and utilizinga large-size rock core A of which the drilling take-out diameter is greater than the diameter of a practical specimen, wherein the drilling diameter is between 130 and 235mm, and the drilling depth is 10 to 20m greater than one time of hole diameter; and b, acquiring the on-site rock core A, shearing the rock core A, fixing the part of the rock core that the length exceeds one time of the hole diameter, and adopting the prior equipment to drill to acquire a rock core B, wherein the drilling diameter is between 46 and 91mm, and the coring length is between 92 and 182mm. The method can be used for underground engineering such as water conservancy and hydropower engineering, traffic, mine and the like.

Description

technical field [0001] The invention relates to a non-destructive sampling method for casing drilling of deeply buried rocks. It is mainly suitable for underground projects such as water conservancy and hydropower projects, transportation, and mines. Background technique [0002] The construction of deep buried projects requires rock sampling under deep buried conditions. The commonly used sampling methods include drilling sampling (core samples) and rock sampling (on-site rock blocks). Because new cracks may appear after the excavation of deep buried tunnels , The strength of the rock has also dropped significantly. These two sampling methods are not a reflection of the quality of the original rock mass, and there is a serious problem of core sample damage, that is, the rock test results cannot represent the strength of the rock under the original condition. Tremendous influence. Contents of the invention [0003] The technical problem to be solved by the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/02
Inventor 单治钢张春生褚卫江
Owner POWERCHINA HUADONG ENG COPORATION LTD
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