CN101576446B - Stress-relieving sampling method without damage of deeply buried rock - Google Patents
Stress-relieving sampling method without damage of deeply buried rock Download PDFInfo
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- CN101576446B CN101576446B CN2009100990975A CN200910099097A CN101576446B CN 101576446 B CN101576446 B CN 101576446B CN 2009100990975 A CN2009100990975 A CN 2009100990975A CN 200910099097 A CN200910099097 A CN 200910099097A CN 101576446 B CN101576446 B CN 101576446B
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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 plateor 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 ofthe 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 spanor 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 thelike.
Description
Technical field
The present invention relates to a kind of stress-relieving sampling method without damage of deeply buried rock.Mainly be applicable to underground workss such as Hydraulic and Hydro-Power Engineering, traffic, mine.
Background technology
Buried engineering construction requires to carry out the rock sampling under buried condition, sampling mode commonly used comprises drill hole sampling (core sample) and piece stone sampling (on-the-spot sillar) mode, all there is serious core damage problem in these two kinds of sampling modes under the buried condition, promptly can not represent the intensity under the rock original state condition, to the acquisition generation significant impact of rock correlation parameter.
Summary of the invention
The technical problem to be solved in the present invention is: the stress-relieving sampling method without damage of deeply buried rock that a kind of easy construction is provided at the problem of above-mentioned existence; to solve the perturbed problem in the buried engineering rock sampling process; avoid the core damage, guarantee to obtain the correlation test achievement of protolith.
The technical solution adopted in the present invention is: stress-relieving sampling method without damage of deeply buried rock, it is characterized in that concrete steps comprise,
A, on the base plate of underground chamber or abutment wall selected resample area, resample area is not less than 1/3rd cavern span with border, distance cavern or highly is advisable;
B, be drilled with one group of stress relieving hole along the border of resample area, its aperture is 75mm-150mm, and hole depth is a principle to pass the remarkable perturbing area of cavern's stress, is one times of cavern span or height;
C, be drilled with at least one get the core hole and obtain core in resample area, the aperture of getting the core hole is 75mm-130mm, and its hole depth is no more than the hole depth in stress relieving hole;
After d, the on-the-spot core of acquisition, choose the sample that the thief hole degree of depth surpasses the core making rock test of one times of cavern span or height.
Described resample area is circular or square or rectangle.
Respectively get distance between the core hole in the described same resample area more than or equal to one times aperture, and respectively get the core hole and all be controlled in the resample area.
The aperture in described stress relieving hole is 75mm, and the aperture of getting the core hole is 75mm～130mm.
The aperture in described stress relieving hole is 91mm, and the aperture of getting the core hole is 75mm～130mm.
The aperture in described stress relieving hole is 110mm, and the aperture of getting the core hole is 75mm～130mm.
The aperture in described stress relieving hole is 130mm, and the aperture of getting the core hole is 75mm～130mm.
The aperture in described stress relieving hole is 150mm, and the aperture of getting the core hole is 75mm～130mm.
All connect fully between described each stress relieving hole.
Described each stress relieving hole only part connects mutually.
The invention has the beneficial effects as follows: the present invention carried out earlier stress relieving in selection area before getting the core test, effectively control even eliminated substantially the damage that the rock sampling process causes, solve the perturbed problem in the buried engineering rock sampling process, guaranteed the mechanical characteristic of the original state rock that test result reflected.
Description of drawings
Fig. 1 is the structural drawing of embodiment 1.
Fig. 2 is the structural drawing of embodiment 2.
Embodiment
Embodiment 1: as shown in Figure 1, the present embodiment concrete steps comprise,
A, on the base plate of underground chamber or abutment wall selected resample area, resample area is not less than 1/3rd cavern span with border, distance cavern or highly is advisable, and the confining method on border is that resample area is the border with the abutment wall when being arranged in base plate, base plate and top board were the border when resample area was arranged on the abutment wall herein;
B, be drilled with one group of stress relieving hole 1 along the border of resample area, its aperture is 91mm, and hole depth is a principle to pass the remarkable perturbing area of cavern's stress, is one times of cavern span or height;
C, in resample area (for more than or equal in the aperture, one times of stress relieving hole) be drilled with at least one and get core hole 2 and obtain cores, the aperture of getting core hole 2 is 75mm, and its hole depth is no more than the hole depth in stress relieving hole 1;
After d, the on-the-spot core of acquisition, choose the sample that the thief hole degree of depth surpasses the core making rock test of one times of cavern span or height.
In this example, resample area is circular, is 348mm in its radius, evenly arranges three in the resample area and gets core hole 2, and the distance of respectively getting between the core hole 2 is 75mm.
Embodiment 2: as shown in Figure 2, the present embodiment concrete steps comprise,
A, on the base plate of underground chamber or abutment wall selected resample area, resample area is not less than 1/3rd cavern span with border, distance cavern or highly is advisable, and the confining method on border is that resample area is the border with the abutment wall when being arranged in base plate, base plate and top board were the border when resample area was arranged on the abutment wall herein;
B, be drilled with one group of stress relieving hole 1 along the border of resample area, its aperture is 91mm, and hole depth is a principle to pass the remarkable perturbing area of cavern's stress, is one times of cavern span or height;
C, be drilled with at least one get core hole 2 and obtain rock cores in resample area, the aperture of getting core hole 2 is 75mm, and hole depth is no more than the hole depth in stress relieving hole 1;
After d, the on-the-spot core of acquisition, choose the sample that the thief hole degree of depth surpasses the core making rock test of one times of cavern span or height.
In this example: resample area is square, and its length of side is 638mm, evenly arranges four in the resample area and gets core hole 2, and the distance of respectively getting between the core hole 2 is 75mm.
Embodiment 3: the present embodiment construction procedure is identical with embodiment 1,2, and difference is that the aperture in stress relieving hole 1 is 75mm, and the corresponding aperture of getting core hole 2 is 75mm.
Embodiment 4: the present embodiment construction procedure is identical with embodiment 1,2, and difference is that the aperture in stress relieving hole 1 is 91mm, and the corresponding aperture of getting core hole 2 is 91mm.
Embodiment 5: the present embodiment construction procedure is identical with embodiment 1,2, and difference is that the aperture in stress relieving hole 1 is 110mm, and the corresponding aperture of getting core hole 2 is 91mm.
Embodiment 6: the present embodiment construction procedure is identical with embodiment 1,2, and difference is that the aperture in stress relieving hole 1 is 130mm, and the corresponding aperture of getting core hole 2 is 110mm.
Embodiment 7: the present embodiment construction procedure is identical with embodiment 1,2, and difference is that the aperture in stress relieving hole 1 is 150mm, and the corresponding aperture of getting core hole 2 is 130mm.
Resample area can also be rectangle or other polygons in the various embodiments described above, and can connect fully between each stress relieving hole 1, also can leave on a small quantity not connect, and be principle with the stress that can effectively remove resample area.
Claims (10)
1. a stress-relieving sampling method without damage of deeply buried rock is characterized in that concrete steps comprise,
A, on the base plate of underground chamber or abutment wall selected resample area, resample area is not less than 1/3rd cavern span with border, distance cavern or highly is advisable;
B, be drilled with one group of stress relieving hole (1) along the border of resample area, its aperture is 75mm-150mm, and hole depth is a principle to pass the remarkable perturbing area of cavern's stress, is one times of cavern span or height;
C, be drilled with at least one get core hole (2) and obtain core in resample area, the aperture of getting core hole (2) is 75mm-130mm, and its hole depth is no more than the hole depth of stress relieving hole (1);
After d, the on-the-spot core of acquisition, choose and get the sample that the core hole depth is no more than the core making rock test of one times of cavern span or height.
2. stress-relieving sampling method without damage of deeply buried rock according to claim 1 is characterized in that: described resample area is circular or square or rectangle.
3. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: respectively get distance between the core hole (2) in the described same resample area more than or equal to one times aperture, and respectively get core hole (2) and all be controlled in the resample area.
4. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: the aperture in described stress relieving hole (1) is 75mm, and the aperture of getting core hole (2) is 75mm～130mm.
5. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: the aperture in described stress relieving hole (1) is 91mm, and the corresponding aperture of getting core hole (2) is 75mm～130mm.
6. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: the aperture in described stress relieving hole (1) is 110mm, and the corresponding aperture of getting core hole (2) is 75mm～130mm.
7. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: the aperture in described stress relieving hole (1) is 130mm, and the corresponding aperture of getting core hole (2) is 75mm～130mm.
8. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: the aperture in described stress relieving hole (1) is 150mm, and the corresponding aperture of getting core hole (2) is 75mm～130mm.
9. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: all connect fully between described each stress relieving hole (1).
10. stress-relieving sampling method without damage of deeply buried rock according to claim 1 and 2 is characterized in that: described each stress relieving hole (1) only part connects mutually.
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| CN2009100990975A CN101576446B (en) | 2009-06-04 | 2009-06-04 | Stress-relieving sampling method without damage of deeply buried rock |
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| CN2009100990975A CN101576446B (en) | 2009-06-04 | 2009-06-04 | Stress-relieving sampling method without damage of deeply buried rock |
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| CN101576446B true CN101576446B (en) | 2011-10-05 |
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| CN102445362B (en) * | 2011-09-28 | 2013-07-24 | 中国水电顾问集团华东勘测设计研究院 | Method for sampling jointed rock mass |
| CN102359371A (en) * | 2011-10-21 | 2012-02-22 | 中水北方勘测设计研究有限责任公司 | Method for determining position and property of weak structural plane through intermediate-small aperture drilling |
| CN103234826B (en) * | 2013-04-26 | 2015-09-30 | 浙江中科依泰斯卡岩石工程研发有限公司 | Schist anisotropic elasticity modulus measurements method |
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