CN115420662A - Inclined-hole high-pressure water pressing experimental method - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 238000003825 pressing Methods 0.000 title claims abstract description 38
- 238000002474 experimental method Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 66
- 238000013461 design Methods 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims description 15
- 239000002390 adhesive tape Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 239000010438 granite Substances 0.000 claims description 4
- 239000003673 groundwater Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000009933 burial Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 17
- 230000009471 action Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses an inclined hole high-pressure water-pressing experimental method, which adopts the technical scheme that: the method comprises the following steps: s1, installing experimental equipment: constructing an inclined hole pressurized-water test device by adopting a single-hole sectional pressurized-water mode, drilling a hole in a clean water forward circulation mode, placing a water stop plug at a test layer section after the drilling reaches a test design depth to serve as a physical water-blocking boundary, and fixing an upper water stop plug and a lower water stop plug by a perforated pipe and connecting the upper water stop plug and the lower water stop plug with a water inlet pipe; a flowmeter and a pressure gauge are arranged at the water inlet pipe for real-time monitoring and acquisition; s2, checking the air tightness of the water stop plug and the water inlet pipe; s3, performing a water pressing experiment; the invention develops the application of the inclined hole high-pressure water-pressurizing test and the research on the permeability characteristic of the rock mass under the action of high permeability pressure, has important guiding significance for underground space engineering design and safe production, and has more accurate result of calculating the permeability parameter of the rock and soil through the experimental method.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to an inclined hole high-pressure water-pressing experimental method.
Background
In recent years, with the rapid development and engineering of economic construction in ChinaThe technology is continuously improved, underground space engineering such as tunnels, underground oil depots, energy storage power stations, civil air defense engineering and the like is developed and utilized on a large scale, and particularly, the application of high-depth pressure-bearing chambers is increasingly wide. In underground engineering, cavern surrounding rocks are always required to bear high internal water pressure and pneumatic pressure, and documents show that [3] The internal pressure of the cavern of the medium-pressure gas energy storage power station can reach 10Mpa, and the water seal pressure of the underground water seal cavern engineering of a certain island in the coastal region of Zhedong reaches 0.125Mpa. The high osmotic pressure also poses great threat to the osmotic stability of the rock mass of the underground cavern while meeting the operation requirement of the project. When the pressure of a pressurized water seal in a central hole of a brocade screen primary hydropower station reaches 0.456Mpa, the water seal is broken to release pressure; the Guangzhou pumped storage power station has the structure split water seepage caused by overlarge hydraulic gradient, and the water seepage amount reaches 32L/s.
As a novel exploration technology, the inclined hole drilling is wide in exploration range, and can effectively identify bad geologic bodies in special and complex sections and key positions, such as faults, broken zones, karst caves and the like. The high-pressure water-pressing test is an important means for revealing the permeability of the rock stratum, and the conventional straight-hole high-pressure water-pressing test is mainly used at present, and the inclined-hole high-pressure water-pressing test can effectively prove the permeability of the rock mass and reduce the workload of drilling operation. According to the water conservancy and hydropower engineering drilling water pressure test regulation SL 31-2003, a laminar flow formula is adopted for calculating the permeability coefficient of the rock mass with low water permeability in a turbulent flow state, and the permeability coefficient can be obtained only approximately. In practical engineering, as the pressure is increased, the water flow state around the drill hole can be converted into nonlinear flow, and even hydraulic fracture is induced, namely the pressing-in flow rate is obviously increased. If the linear flow formula is continuously used for calculation, the calculation result of the rock-soil permeability parameter is smaller. Therefore, the application of the inclined hole high-pressure water-pressurizing test and the research on the permeability characteristic of the rock mass under the action of high permeability pressure have important guiding significance for underground space engineering design and safe production.
Disclosure of Invention
The invention aims to provide an inclined hole high-pressure water pressing experimental method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an inclined hole high-pressure water pressing experiment method comprises the following steps:
s1, installing experimental equipment: constructing an inclined hole pressurized-water test device by adopting a single-hole sectional pressurized-water mode, drilling a hole in a clean water forward circulation mode, placing a water stop plug at a test layer section after the drilling reaches a test design depth to serve as a physical water-blocking boundary, and fixing an upper water stop plug and a lower water stop plug by a perforated pipe and connecting the upper water stop plug and the lower water stop plug with a water inlet pipe; a flowmeter and a pressure gauge are arranged at the water inlet pipe for real-time monitoring and acquisition;
s2, checking the air tightness of the water stop plug and the water inlet pipe: inflating the water stop plug, stopping air supply after the design pressure is reached, observing the change of a pressure gauge, and if the air pressure is kept constant or changes within the design range, indicating that the air tightness of the water stop plug is good; keeping the pressure of the water stop plug constant, starting water pressing to enable the water pressure of the test section to be at a certain constant value, placing a water pressure recorder on the upper portion of the upper water stop plug, observing the change of the water pressure, and if the water pressure is not changed or the change is in a design range, indicating that the sealing performance of the water inlet pipe is good;
s3, water pressing experiment: the water pressing test is carried out according to the pressure not lower than three stages and not lower than five stages, the pressure of the test stage is set to be 0.3-1.0 Mpa, the recording frequency of the water pressing flow is 1 time/min, when the pressing flow has no continuous increasing trend and the maximum and minimum difference of continuous 5 times of flow readings is less than 10 percent of the final value or reaches 1L/min, the pressure of the next stage is entered, the pipe loss pressure is considered, and the pressure of each stage of the test stage is calculated according to the formula (1):
P＝P p +P z -P s (1)；
wherein P is the pressure of the test section; p p Indicating gauge pressure for the pressure gauge; p z Water column pressure from the center of the pressure gauge to the ground water level; p is s The tube loss pressure.
Preferably, the lithology of the stratum of the tested interval in the S1 is mainly granite, joints and cracks are relatively developed, and the integrity of a rock core is general.
Preferably, the drilling inclination angle in the S1 is 45 degrees, and the hole diameter is 75mm.
Preferably, a water stop plug with the diameter of 45mm is placed in the test layer section in the S1.
Preferably, when the upper water stop plug and the lower water stop plug are fixed by the perforated pipe and connected with the water inlet pipe in the step S1, the joints are wound by the raw adhesive tape and the waterproof adhesive tape.
Preferably, in S3, if the burial depth of the test section is 122.00 to 131.40m, the test section is pressurized in five stages and nine stages, and the pressure indicated by the five-stage pressure gauge is P1=0.2Mpa, P2=0.5Mpa, P3=0.8Mpa, P4=1.1Mpa, and P5=1.4Mpa, and the test section is pressurized in nine stages at P1-P2-P3-P4-P5-P4-P3-P2-P1.
Preferably, in S3, during the test, when the water pressure is adjusted, an abnormal value of the sudden change of the flow rate value detected by the flow meter at the water inlet is eliminated.
Preferably, after S3, a curve of the pressurized water test process is drawn and analyzed.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops the application of the inclined hole high-pressure water-pressurizing test and the research on the permeability characteristic of the rock mass under the action of high permeability pressure, has important guiding significance for underground space engineering design and safe production, and has more accurate result of calculating the permeability parameter of the rock and soil through the experimental method.
Drawings
FIG. 1 is a schematic diagram of the experimental apparatus of the present invention;
fig. 2 is a graph of the pressure versus flow rate of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
Referring to fig. 1 and fig. 2, the present invention provides a technical solution: an inclined hole high-pressure water pressing experiment method comprises the following steps:
s1, installing experimental equipment: constructing an inclined hole pressurized-water test device by adopting a single-hole sectional pressurized-water mode, drilling a hole in a clean water forward circulation mode, placing a water stop plug at a test layer section after the drilling reaches a test design depth to serve as a physical water-blocking boundary, and fixing an upper water stop plug and a lower water stop plug by a perforated pipe and connecting the upper water stop plug and the lower water stop plug with a water inlet pipe; a flowmeter and a pressure gauge are arranged at the water inlet pipe for real-time monitoring and acquisition;
s2, checking the air tightness of the water stop plug and the water inlet pipe: inflating the water stop plug, stopping air supply after the design pressure is reached, observing the change of a pressure gauge, and if the air pressure is kept constant or changes within the design range, indicating that the air tightness of the water stop plug is good; keeping the pressure of the water stop plug constant, starting water pressing to enable the water pressure of the test section to be at a certain constant value, placing a water pressure recorder on the upper part of the upper water stop plug and observing the change of the water pressure, and if the water pressure is not changed or is changed within the design range, indicating that the sealing performance of the water inlet pipe is good;
s3, water pressing experiment: the water pressing test is carried out according to the pressure not lower than three stages and not lower than five stages, the pressure of the test stage is set to be 0.3-1.0 Mpa, the recording frequency of the water pressing flow is 1 time/min, when the pressing flow has no continuous increasing trend and the maximum and minimum difference of continuous 5 times of flow readings is less than 10 percent of the final value or reaches 1L/min, the pressure of the next stage is entered, the pipe loss pressure is considered, and the pressure of each stage of the test stage is calculated according to the formula (1):
P＝P p +P z -P s (1)；
wherein P is the pressure of the test section; p is p Indicating gauge pressure for the pressure gauge; p z The water column pressure from the center of the pressure gauge to the ground water level; p s The tube loss pressure.
The lithology of the stratum of the tested layer section in the S1 is mainly granite, joints and cracks are relatively developed, and the integrity of a rock core is general.
Wherein the drilling inclination angle in the S1 is 45 degrees, and the aperture is 75mm.
And a water stop plug with the diameter of 45mm is placed in the test layer section in the S1.
And when the upper water stop plug and the lower water stop plug are fixed by a perforated pipe and connected with a water inlet pipe in the S1, the joints are wound by using raw adhesive tapes and waterproof adhesive tapes.
In S3, if the burial depth of the test section is 122.00 to 131.40m, the pressure is performed according to five stages and nine stages, the indication pressure of the five-stage pressure gauge is respectively P1=0.2Mpa, P2=0.5Mpa, P3=0.8Mpa, P4=1.1Mpa and P5=1.4Mpa, and the water is pressurized according to nine stage pressures of P1-P2-P3-P4-P5-P4-P3-P2-P1.
In the step S3, in the test process, when the water pressure is adjusted, the abnormal value of the sudden change of the flow value detected by the flow meter at the water inlet is eliminated.
And after S3, drawing a curve of the pressurized water test process and analyzing.
The method develops the application of the inclined hole high-pressure water-pressing test and the research on the permeability characteristic of the rock mass under the action of high permeability pressure, has important guiding significance on underground space engineering design and safe production, and has more accurate result of calculating the permeability parameter of the rock and soil through the experimental method.
Example 2
Referring to fig. 1 and fig. 2, the present invention provides a technical solution: a slant hole high-pressure water pressing experiment method is applied to a certain field in the southeast coast of China, a single-hole sectional water pressing mode is adopted, and the basic principle of a water pressing device is shown in figure 1. The lithology of the stratum of the test layer section is mainly granite, joints and cracks are relatively developed, and the integrity of a rock core is general. And drilling holes in a clean water positive circulation mode, wherein the drilling inclination angle is 45 degrees, and the hole diameter is 75mm. After the drilling reaches the design depth of the test, a water stop plug with the diameter of 45mm is placed at the test layer section to serve as a physical water stop boundary; the upper water stop plug and the lower water stop plug are fixed by a perforated pipe and connected with a water inlet pipe, and the joints are wound by a raw adhesive tape and a waterproof adhesive tape, so that high-pressure water seepage outside the test layer section is prevented to the greatest extent; a flowmeter and a pressure gauge are arranged at the water inlet pipe for real-time monitoring and acquisition; in order to prevent the air pipe from being worn and broken due to the friction between the air pipe and the upper rock wall in the process of placing and recovering equipment in the hole, the air pipe is penetrated in the water inlet pipe in the test.
After the equipment fixing is finished, the air tightness of the water stop plug and the water inlet pipe needs to be checked, and the method comprises the following specific steps: (1) Inflating the water stop plug, stopping air supply after the designed pressure is reached, observing the change of a pressure gauge, and if the air pressure keeps constant or changes little, indicating that the air tightness of the water stop plug is good; (2) And keeping the pressure of the water stop plug constant, and starting to press water to ensure that the water pressure of the test section is at a certain constant value. And a water pressure recorder is arranged at the upper part of the upper water stop plug, the water pressure change is observed, and if the change is not large, the water inlet pipe has good sealing performance.
Although the pressurized water test is carried out in five stages at three stages of pressure, it is preferable to set the pressure in the test stage to 0.3 to 1.0MPa, according to the specifications. Considering that the test section is embedded deeply, the pressure of the test section and the test stage are increased properly, so the test is carried out according to five-level pressure and nine stages. Taking a certain section of the test inclined hole B as an example, the depth of the test section is 122.00-131.40 m, the indication pressure of a five-level pressure gauge is P1=0.2Mpa, P2=0.5Mpa, P3=0.8Mpa, P4=1.1Mpa and P5=1.4Mpa respectively, and water is pressurized according to nine stage pressures of P1-P2-P3-P4-P5-P4-P3-P2-P1. The frequency of the pressurized water flow is recorded as 1 time/min, and when the pressurized flow does not increase continuously and the maximum and minimum difference of the continuous 5 times of flow readings is less than 10 percent (or 1L/min) of the final value, the next stage pressure can be entered. Considering the pipe loss pressure, the pressure of each stage of test section is calculated according to the formula (1):
P＝P p +P z -P s (1)；
wherein P is the pressure of the test section; p p Indicating gauge pressure for the pressure gauge; p is z Water column pressure from the center of the pressure gauge to the ground water level; p s The tube loss pressure.
The above embodiments illustrate and describe embodiments of the present invention, and it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An inclined hole high-pressure water pressing experimental method is characterized in that: the method comprises the following steps:
s1, installing experimental equipment: constructing an inclined hole water pressurizing test device by adopting a single-hole sectional water pressurizing mode, drilling a hole in a clean water positive circulation mode, placing a water stop plug at a test layer section after the drilling reaches a test design depth to serve as a physical water blocking boundary, and fixing an upper water stop plug and a lower water stop plug by a perforated pipe and connecting the upper water stop plug and the lower water stop plug with a water inlet pipe; installing a flowmeter and a pressure gauge at the water inlet pipe for real-time monitoring and acquisition;
s2, checking the air tightness of the water stop plug and the water inlet pipe: inflating the water stop plug, stopping air supply after the design pressure is reached, observing the change of a pressure gauge, and if the air pressure is kept constant or the change is within the design range, indicating that the air tightness of the water stop plug is good; keeping the pressure of the water stop plug constant, starting water pressing to enable the water pressure of the test section to be at a certain constant value, placing a water pressure recorder on the upper portion of the upper water stop plug, observing the change of the water pressure, and if the water pressure is not changed or the change is in a design range, indicating that the sealing performance of the water inlet pipe is good;
s3, water pressing experiment: the water pressing test is carried out according to the pressure not lower than three stages and not lower than five stages, the pressure of the test stage is set to be 0.3-1.0 Mpa, the recording frequency of the water pressing flow is 1 time/min, when the pressing flow has no continuous increasing trend and the maximum and minimum difference of continuous 5 times of flow readings is less than 10 percent of the final value or reaches 1L/min, the pressure of the next stage is entered, the pipe loss pressure is considered, and the pressure of each stage of the test stage is calculated according to the formula (1):
P＝P p +P z -P s (1)；
wherein P is the pressure of the test section; p is p Indicating gauge pressure for the pressure gauge; p z The water column pressure from the center of the pressure gauge to the ground water level; p is s The tube loss pressure.
2. The inclined hole high-pressure water pressing experimental method according to claim 1, characterized in that: in the S1, the lithology of the stratum of the tested layer section is mainly granite, joints and cracks are relatively developed, and the integrity of a rock core is general.
3. The inclined hole high-pressure water pressing experimental method according to claim 1, characterized in that: and the drilling inclination angle in the S1 is 45 degrees, and the aperture is 75mm.
4. The inclined hole high-pressure water pressing experimental method according to claim 1, characterized in that: and a water stop plug with the diameter of 45mm is placed in the test layer section in the S1.
5. The inclined hole high-pressure water pressing experimental method according to claim 1, characterized in that: and in the S1, when the upper water stop plug and the lower water stop plug are fixed by a perforated pipe and connected with a water inlet pipe, the joints are wound by raw adhesive tapes and waterproof adhesive tapes.
6. The inclined-hole high-pressure water-pressing experimental method as claimed in claim 1, characterized in that: in the step S3, if the burial depth of the test section is 122.00 to 131.40m, the test is performed according to five-level pressure and nine stages, the indication pressure of the five-level pressure gauge is respectively P1=0.2Mpa, P2=0.5Mpa, P3=0.8Mpa, P4=1.1Mpa and P5=1.4Mpa, and the water is pressurized according to nine stage pressures of P1-P2-P3-P4-P5-P4-P3-P2-P1.
7. The inclined hole high-pressure water pressing experimental method according to claim 1, characterized in that: and in the S3, in the test process, when the water pressure is regulated, the abnormal value of the sudden change of the flow value detected by the flow meter at the water inlet is eliminated.
8. The inclined-hole high-pressure water-pressing experimental method as claimed in claim 1, characterized in that: and S3, drawing a curve of the pressurized water test process and analyzing.
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| CN116105946A (en) * | 2023-04-12 | 2023-05-12 | 中国电建集团西北勘测设计研究院有限公司 | Drilling high-pressure air compression test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116105946A (en) * | 2023-04-12 | 2023-05-12 | 中国电建集团西北勘测设计研究院有限公司 | Drilling high-pressure air compression test device and test method |
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Effective date of registration: 20230208 Address after: No. 32, Wenwei Road, Xianlin Street, Yuhang District, Hangzhou, Zhejiang 310000 Applicant after: Zhejiang Chemical Engineering Geological Survey Institute Co.,Ltd. Applicant after: NINGBO NINGDA FOUNDATION TREATMENT TECHNOLOGY CO.,LTD. Address before: No. 32, Wenwei Road, Xianlin street, Yuhang District, Hangzhou, Zhejiang 311122 Applicant before: Zhejiang Chemical Engineering Geological Survey Institute Co.,Ltd. |