Stress-relieving sampling method without damage of deeply buried rock

A stress relief and non-destructive sampling technology, applied in the direction of sampling devices, etc., can solve the problems of rock-related parameters, failure to represent rock strength, core sample damage, etc., and achieve the effect of ensuring mechanical properties, eliminating damage, and solving disturbance problems

Active Publication Date: 2009-11-11
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 burial projects requires rock sampling under deep burial conditions. The commonly used sampling methods include drilling sampling (core samples) and rock sampling (on-site rock blocks). These two sampling methods have serious problems under deep burial conditions. The problem of core sample damage, that is, it cannot represent the strength of the rock under the original condition, has a significant impact on the acquisition of rock-related parameters

Method used

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  • Stress-relieving sampling method without damage of deeply buried rock
  • Stress-relieving sampling method without damage of deeply buried rock

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: as figure 1 As shown, the specific steps of this embodiment include,

[0022] a. Select the sampling area on the bottom plate or side wall of the underground cavern. The sampling area should be no less than one-third of the cavern span or height from the cavern boundary. The boundary method here is that the sampling area is arranged in When the base plate is bounded by the side wall, when the sampling area is arranged on the side wall, the base plate and the top plate are bounded;

[0023] b. Drill a group of stress relief holes 1 along the boundary of the sampling area, the diameter of which is 91 mm, and the depth of the holes is one time of the span or height of the cavern, based on the principle of passing through the stress-disturbed zone of the cavern;

[0024] c. Drill at least one core hole 2 to obtain a rock core in the sampling area (within the diameter of the stress relief hole greater than or equal to one time). hole depth;

[0025] d. After...

Embodiment 2

[0027] Embodiment 2: as figure 2 As shown, the specific steps of this embodiment include,

[0028] a. Select the sampling area on the bottom plate or side wall of the underground cavern. The sampling area should be no less than one-third of the cavern span or height from the cavern boundary. The boundary method here is that the sampling area is arranged in When the base plate is bounded by the side wall, when the sampling area is arranged on the side wall, the base plate and the top plate are bounded;

[0029] b. Drill a group of stress relief holes 1 along the boundary of the sampling area, the diameter of which is 91 mm, and the depth of the holes is one time of the span or height of the cavern, based on the principle of passing through the stress-disturbed zone of the cavern;

[0030] c. Drilling at least one core hole 2 in the sampling area to obtain a core, the diameter of the core hole 2 is 75mm, and the hole depth does not exceed the hole depth of the stress relief ho...

Embodiment 3

[0033] Embodiment 3: The construction steps of this embodiment are the same as those of Embodiments 1 and 2, except that the diameter of the stress relief hole 1 is 75mm, and the diameter of the corresponding coring hole 2 is 75mm.

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Abstract

The invention relates to a stress-relieving sampling method without damage of deeply buried rock, which aims at solving the problem of disturbance in the sampling process of deeply buried engineering rock, avoiding the damage to core sample and guaranteeing the obtainment of relevant test results of virgin rock. The technical proposal is as follows: a. a sampling area is selected on a bottom plate or a side wall of an underground chamber, and the distance between the sampling area and the boundary of the chamber is preferentially not less than one third of the span or height of the chamber; b. a group of stress-relieving holes are drilled along the boundary of the sampling area, the aperture thereof is 75mm to 150mm, and the depth of holes is arranged according to the principle of penetrating the obvious stress disturbance area of the chamber and equals to the span or height of the chamber; c. at least one coring hole is drilled in the sampling area to obtain the core, the aperture of the coring hole is 75mm to 130mm, and the depth thereof does not exceed that of the stress relieving hole; and d. after the cores are obtained, a core of which the sampling hole depth exceeds the span or height of the chamber is selected to manufacture the sample of the rock test. The sampling method is applicable to the underground engineering such as hydraulic and hydro-power engineering and the like.

Description

technical field [0001] The invention relates to a non-destructive sampling method for deep-buried rock stress relief. It is mainly suitable for underground projects such as water conservancy and hydropower projects, transportation, and mines. Background technique [0002] The construction of deep burial projects requires rock sampling under deep burial conditions. The commonly used sampling methods include drilling sampling (core samples) and rock sampling (on-site rock blocks). These two sampling methods have serious problems under deep burial conditions. The problem of core sample damage, that is, it cannot represent the strength of the rock under undisturbed conditions, has a significant impact on the acquisition of rock-related parameters. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a convenient non-destructive sampling method for deep-buried rock stress relief in view of the above existing problems, so ...

Claims

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Application Information

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IPC IPC(8): G01N1/04
Inventor 单治钢褚卫江朱焕春
Owner POWERCHINA HUADONG ENG COPORATION LTD
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