CN112557279A - Weathered bedrock hole-fracture vertical permeability testing device and method - Google Patents
Weathered bedrock hole-fracture vertical permeability testing device and method Download PDFInfo
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- CN112557279A CN112557279A CN202011630034.0A CN202011630034A CN112557279A CN 112557279 A CN112557279 A CN 112557279A CN 202011630034 A CN202011630034 A CN 202011630034A CN 112557279 A CN112557279 A CN 112557279A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 230000035699 permeability Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000003245 coal Substances 0.000 abstract description 11
- 238000005065 mining Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- General Health & Medical Sciences (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a weathering bedrock hole-fracture vertical permeability testing device and a method, wherein the weathering bedrock hole-fracture vertical permeability testing device comprises: the device comprises a test cavity, a high-pressure rubber stopper, a high-pressure water injection section and a leakage measuring section, wherein an inner hollow rubber stopper is arranged in the test cavity and divides the test cavity into the high-pressure water injection section and the leakage measuring section; the end part of the high-pressure water injection section is provided with a detection end; the leakage measuring section is provided with a first communicating valve; one end of the liquid pipeline is communicated with the high-pressure water injection section and is provided with a second communicating valve, and a water injection pressure gauge is arranged on the liquid pipeline; a gas pipeline is arranged in the test cavity; the test chamber is provided with an expanding rubber shaft. The device has the characteristics of simple structure, reliable work, stable performance and the like, and can meet the field test work requirement of vertical permeability of the weathered bedrock under a coal mine.
Description
Technical Field
The invention belongs to the technical field of coal mine water prevention and control, relates to the field of testing and identification of in-situ vertical permeability of weathered bedrock, and particularly relates to a device and a method for testing hole-fracture vertical permeability of weathered bedrock.
Background
In the field of water prevention and control of coal mines, weathered bedrock which is covered on a shallow-buried deep coal seam is the most important aquifer, the water-rich property of the aquifer is stronger due to extremely developed cracks and pores, if the coal seam mining influences the horizon, vertical hydraulic connection occurs and the aquifer permeates into a mining space, the permeation quantity depends on two factors, namely the vertical permeability of the weathered bedrock and the mining swept range. Therefore, the test and identification of the in-situ vertical permeability of the weathered bedrock have important research significance for preventing and controlling water in the coal mine. Specifically, under geological conditions such as shallow buried depth and thin bedrock, the water-rich property of a fracture aquifer of the bedrock of the coal bed is weak, but the water-rich property of the aquifer of the weathered bedrock is strong due to the hydraulic connection between the weathered bedrock and the loose aquifer, so that the problem of roof water burst is often caused under the mining influences such as mine roadway excavation and coal bed extraction. Therefore, two factors are used for influencing the water inflow of the water-affected area of the mine where the water damage of the weathered bedrock exists, wherein one factor is the water-rich property and the permeability of the aquifer of the weathered bedrock; the second is the range from the mining fluctuation of the driving roadway or the stope face to the weathered bedrock. For the first factor, the vertical permeability of the weathered bedrock can be tested in situ, and the parameter is an important basis for roadway excavation water inflow prediction, drainage facility arrangement and the like, so that the method has important practical significance for testing the vertical permeability of the aquifer of the weathered bedrock.
At present, no relevant instrument and equipment and relevant technical method for vertical permeability test of the weathered bedrock exist, and a new vertical permeability test device and method for weathered bedrock hole-fracture are urgently needed.
Disclosure of Invention
The invention aims to provide a weathered bedrock hole-fracture vertical permeability testing device and a method, so as to solve one or more technical problems. The device has the characteristics of simple structure, reliable work, stable performance and the like, and can meet the field test work requirement of vertical permeability of the weathered bedrock under a coal mine.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a vertical permeability testing device for a hole-fracture of a weathered base rock, which comprises:
the device comprises a test cavity, a high-pressure rubber stopper and a leakage measuring section, wherein an inner hollow rubber high-pressure stopper is arranged in the test cavity and divides the test cavity into a high-pressure water injection section and a leakage measuring section; a detection end is arranged at the end part of the high-pressure water injection section; the leakage measuring section is provided with a first communicating valve for communicating the water pressure measuring meter and the water flow measuring meter; the hollow rubber high-pressure plugging device is provided with a liquid pipeline, one end of the liquid pipeline is communicated with the high-pressure water injection section and is provided with a second communicating valve, the other end of the liquid pipeline is communicated with an external water source, and a pressure gauge for testing water injection pressure is arranged on the liquid pipeline; the test cavity is provided with an expansion rubber shaft, the expansion rubber shaft is provided with a gas pipeline, one end of the gas pipeline is communicated with the expansion rubber shaft, and the other end of the gas pipeline is communicated with a gas source.
The invention has the further improvement that the detection end is provided with a water outlet for injecting water to the hole-crack; the water injection pressure range is 2-4 MPa.
The invention is further improved in that the plugging pressure range of the hollow rubber high-pressure plugging device is 3-6 MPa.
In a further development of the invention, the probe tip is a conical tip.
The invention further improves the method and also comprises the following steps: and the gas pipeline is communicated with the gas source.
The invention is further improved in that the pressure range of the air source is 0.6-0.8 Mpa.
The invention further improves the method and also comprises the following steps: the leakage measuring section is provided with a first communicating valve communicated with the water pressure measuring meter and the water flow measuring meter.
The invention relates to a method for testing vertical permeability of a hole-fracture of a weathered base rock, which comprises the following steps of:
connecting the test cavity with a drill rod of a drilling machine and then pushing the test cavity into a weathered bedrock section;
a drilling machine is used for providing a water source, water is injected through a liquid pipeline, and the water pressure is measured; the gas pipeline is introduced into high-pressure gas of the underground ventilation pipeline; measuring the water pressure and the seepage quantity of the seepage observation section;
k is obtained through calculation based on the following formula, and the vertical permeability test of the Weathered foundation rock hole-fracture is completed;
wherein Q is the seepage loss, omega is the cross-sectional area of the seepage observation section, J is the hydraulic gradient,
d is the inner diameter of the test cavity, L is the length of the test cavity, L1 is the length of the high-pressure water injection section, L2 is the length of the seepage observation section, and Ls is the seepage length; the water head height difference is delta H, delta H is delta P, and delta P is the difference between the water injection pressure and the seepage pressure.
Compared with the prior art, the invention has the following beneficial effects:
the device has the characteristics of simple structure, reliable work, stable performance and the like, and can meet the field test work requirement of vertical permeability of the weathered bedrock under a coal mine. Specifically, the method comprises the following steps: (1) the device has simple structure, and the whole parts are easy to assemble and disassemble and convenient to carry; (2) the device has reliable work, and has strong detection reliability in complex drilling because the whole part is smaller; (3) the device can be used for continuously measuring the weathered bedrock section; (4) the device uses underground ventilation and water supply pipelines, the rubber expansion performance is stable, the water injection is reliable, and the detection effect is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a vertical permeability testing device for a weathered bedrock pore-fracture according to an embodiment of the invention;
FIG. 2 is a schematic diagram of probing in an embodiment of the invention;
in the figure, 1, probe tip; 2. a high-pressure water injection section; 3. a hollow rubber high-pressure plugging device; 4. an expanded rubber shaft; 5. a loss measurement section; 6. a first communication valve; 7. a liquid line; 8. a gas line; 9. a second gate valve.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, a vertical permeability testing apparatus for a hole-fracture of a weathered bedrock according to an embodiment of the present invention includes:
the device comprises a test cavity, wherein a stopper is arranged in the test cavity, and the stopper divides the test cavity into a high-pressure water injection section 2 and a leakage measurement section 5; specifically, the total length of the test chamber is L, the length of the high-pressure water injection section 2 is L1, and the length of the leakage measurement section 5 is L2.
A detection end head 1 is arranged at the end part of the high-pressure water injection section 2, and the detection end head 1 is provided with a water outlet and is used for injecting water into the hole-crack; specifically, the water injection pressure can be 2-4 MPa; more specifically, the probing tip 1 may be a conical tip; more specifically, the plugging device is a hollow rubber high-pressure plugging device 3, and the plugging pressure is 3-6 MPa.
The plugging device is provided with a gas pipeline 8 for realizing the communication between the high-pressure water injection section 2 and an external high-pressure gas source, and the gas pipeline 8 is provided with a high-pressure gas communicating valve; specifically, the range of the gas injection pressure or the high-pressure gas source pressure is 0.6-0.8 MPa.
The plugging device is provided with a liquid pipeline 7 for realizing the communication between the high-pressure water injection section 2 and an external water source; the liquid pipeline 7 is provided with a second joint valve 9 for blocking air leakage of the inflation cavity; a water injection pressure gauge is arranged on the liquid pipeline 7 and is used for measuring water injection leakage;
the end part of the leakage measuring section 5 is sealed and is provided with a first communicating valve 6 which is used for connecting the probe and the drill rod and connecting the air pipe and the water pipe for inflation and water injection; and the expansion rubber shaft 4 is arranged in the middle of the test cavity and used for sealing the lower section drilling measurement space.
The device comprises a water injection section, an expansion section and a seepage measurement section, wherein a probe is connected with drilling and then pushed into a weathered bedrock section, water is injected by using the rear end of a drilling machine, and water pressure is measured at the same time; connecting high-pressure gas of an underground ventilation pipeline to expand and plug an air expansion shaft in the middle of the probe; and measuring the water pressure and the seepage quantity of the seepage observation section by using the connecting pipeline.
Referring to fig. 2, a method for testing vertical permeability of a hole-fracture of a weathered bedrock according to an embodiment of the present invention includes the following steps:
The formula is as follows:
wherein Q is the seepage loss, m3/s；
Omega is the cross-sectional area of the seepage observation section, m2；
J is the water power gradient and is the water power gradient,
m/s；
d is the inner diameter of the probe, m;
l is the length of the probe, and L1 is the length of the water injection section; l2 is the length of the seepage observation segment, m;
ls is the seepage length which is approximately equal to L, m;
the water head height difference is delta H, delta H is delta P, and delta P is the difference between the water injection pressure and the seepage pressure.
The device has the characteristics of simple structure, reliable work, stable performance and the like, and can meet the field test work requirement of vertical permeability of the weathered bedrock under a coal mine. Specifically, the method comprises the following steps:
(1) the device has simple structure, and the whole parts are easy to assemble and disassemble and convenient to carry;
(2) the device has reliable work, and has strong detection reliability in complex drilling because the whole part is smaller and most of the whole part is iron;
(3) the total length of the device is about 1.2-1.5 m, and the weathering bedrock section can be continuously measured;
(4) the device uses underground ventilation and water supply pipelines, the rubber expansion performance is stable, the water injection is reliable, and the detection effect is better.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (9)
1. A vertical permeability testing arrangement of morals and manners basement rock hole-fracture which characterized in that includes:
the device comprises a test cavity, wherein an inner hollow rubber high-pressure plugging device (3) is arranged in the test cavity, and the test cavity is divided into a high-pressure water injection section (2) and a leakage measurement section (5) by the inner hollow rubber high-pressure plugging device (3); a detection end (1) is arranged at the end part of the high-pressure water injection section (2); the leakage measuring section (5) is provided with a first communicating valve (6) for communicating a water pressure measuring meter and a water flow measuring meter; the hollow rubber high-pressure plugging device (3) is provided with a liquid pipeline (7), one end of the liquid pipeline (7) is communicated with the high-pressure water injection section (2) and is provided with a second joint valve (9), the other end of the liquid pipeline is communicated with an external water source, and a pressure gauge for testing water injection pressure is arranged on the liquid pipeline (7); the test cavity is provided with an expansion rubber shaft (4), the expansion rubber shaft (4) is provided with a gas pipeline (8), one end of the gas pipeline (8) is communicated with the expansion rubber shaft (4), and the other end of the gas pipeline is communicated with a gas source.
2. The vertical permeability test device for Weathered bedrock pore-fractures according to claim 1, characterized in that the probe head (1) is provided with water outlets for injecting water into the pore-fractures.
3. The vertical permeability test apparatus for Weathered bedrock pore-fractures according to claim 2, further comprising: and the water injection pressure range of the external water source is 2-4 MPa.
4. The vertical permeability test device for Weathered bedrock pores-fractures according to claim 3, characterized in that the plugging pressure range of the inner hollow rubber high-pressure plugging device (3) is 3-6 MPa.
5. The vertical permeability testing device for Weathered bedrock pore-fractures according to claim 1, characterized in that the probe tip (1) is a conical tip.
6. The vertical permeability test apparatus for Weathered bedrock pore-fractures according to claim 1, further comprising:
and the gas pipeline (8) is communicated with the gas source.
7. The vertical permeability testing device for Weathered bedrock pores-fractures according to claim 6, wherein the gas source pressure is in a range of 0.6-0.8 MPa.
8. The vertical permeability test apparatus for Weathered bedrock pore-fractures according to claim 1, further comprising: the leakage measuring section (5) is provided with a first communicating valve (6) communicated with the water pressure measuring meter and the water flow measuring meter.
9. A weathered bedrock hole-fracture vertical permeability testing method is characterized in that the weathered bedrock hole-fracture vertical permeability testing device based on the method in claim 1 comprises the following steps:
connecting the test cavity with a drill rod of a drilling machine and then pushing the test cavity into a weathered bedrock section;
a drilling machine is used for providing a water source, water is injected through a liquid pipeline, and the water pressure is measured; the gas pipeline is introduced into high-pressure gas of the underground ventilation pipeline; measuring the water pressure and the seepage quantity of the seepage observation section;
k is obtained through calculation based on the following formula, and the vertical permeability test of the Weathered foundation rock hole-fracture is completed;
wherein Q is the seepage loss, omega is the cross-sectional area of the seepage observation section, J is the hydraulic gradient,
d is the inner diameter of the test cavity, L is the length of the test cavity, L1 is the length of the high-pressure water injection section, L2 is the length of the seepage observation section, and Ls is the seepage length; delta H is head height difference, Delta H is equal to Delta P, and DeltaP is the difference between the water injection pressure and the seepage pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011630034.0A CN112557279A (en) | 2020-12-30 | 2020-12-30 | Weathered bedrock hole-fracture vertical permeability testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011630034.0A CN112557279A (en) | 2020-12-30 | 2020-12-30 | Weathered bedrock hole-fracture vertical permeability testing device and method |
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| CN112557279A true CN112557279A (en) | 2021-03-26 |
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| CN202011630034.0A Pending CN112557279A (en) | 2020-12-30 | 2020-12-30 | Weathered bedrock hole-fracture vertical permeability testing device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114594036A (en) * | 2022-03-30 | 2022-06-07 | 中国水利水电科学研究院 | Soil material permeability coefficient rapid determination device |
| CN116973291A (en) * | 2023-09-21 | 2023-10-31 | 石家庄铁道大学 | Rock stratum water pressure in-situ stability and transient integrated permeability measurement device |
-
2020
- 2020-12-30 CN CN202011630034.0A patent/CN112557279A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114594036A (en) * | 2022-03-30 | 2022-06-07 | 中国水利水电科学研究院 | Soil material permeability coefficient rapid determination device |
| CN116973291A (en) * | 2023-09-21 | 2023-10-31 | 石家庄铁道大学 | Rock stratum water pressure in-situ stability and transient integrated permeability measurement device |
| CN116973291B (en) * | 2023-09-21 | 2023-12-19 | 石家庄铁道大学 | Rock stratum water pressure in-situ stability and transient integrated permeability measurement device |
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