KR20240030166A - Underground medium repair characteristics monitoring System - Google Patents

Abstract

The present invention is an underground medium hydraulic characteristics monitoring system for observing groundwater flow in underground rock. The present invention includes a vertical hole formed by drilling underground to a certain depth in an area where observation of groundwater flow and permeability of the underground medium is required, and insertion into the vertical hole. a connecting pipe, a packer that is installed between the outer peripheral surface of the connecting pipe and the inner peripheral surface of the vertical hole and expands or contracts as water is injected or absorbed therein, and the packer is expanded so that the packer is connected to the outer peripheral surface of the connecting pipe and the inner peripheral surface of the vertical hole. A packer expander that fills the space between the vertical holes and operates to isolate the upper and lower parts based on the position of the packer, a vacuum pump that pumps water into the space isolated by the packer among the vertical holes, and a packer that is isolated by the packer By including a water injection unit that injects water into the space and a pressure measurement unit that measures the pressure of the water injected by the water injection unit into a space isolated by a packer, depth-specific monitoring is isolated through multiple packers within one borehole. We aim to provide an underground medium hydraulic characteristics monitor system that measures the groundwater level in real time by installing a pressure sensor in the section and can quickly and inexpensively calculate the hydraulic conductivity of the underground medium by injecting water or momentarily pumping groundwater.

Description

Underground medium repair characteristics monitoring system}

The present invention relates to a system that can observe and analyze the hydraulic characteristics of groundwater flowing in the underground rock and the characteristics of the rock that constitutes the underground for safe development and use of the underground.

As industrialization progresses and aboveground space is becoming saturated, the use of underground space has become a major social, economic, and environmental issue. In the past, underground space was used as a safe residential space from harsh climate conditions or wild animals, but since 1970, underground space has been recognized as an important spatial element in terms of three-dimensional space utilization in cities.

In particular, the use of underground space is increasing to efficiently manage national energy sources such as underground carbon dioxide storage, crude oil storage bases, pumped storage power generation, and geothermal power generation. In order to use underground space safely, it is necessary to accurately understand the overall characteristics of the medium that makes up it. Considering the country's geological conditions, crystalline rock with developed insulation is the main medium, and groundwater flowing through the insulation is a major factor in determining the characteristics of the geological environment, such as geochemical conditions and rock stress. In other words, the flow characteristics of groundwater are an important factor to consider in the safety evaluation of underground space utilization. In order to understand the flow characteristics of groundwater, the geology-hydraulic geology-geochemistry-rock stress characteristics of crystalline rock must be analyzed in conjunction with each other. You can safely use the underground space.

However, the reality is that efforts to understand the mechanisms of groundwater flow by deriving hydrogeological characteristics from crystalline rock with developed insulation remain a challenge that has persisted for a long time. In order to understand the flow of groundwater in crystalline rock, field hydraulic tests must be conducted first to determine the hydrogeological characteristics of the aquifer. However, in order to conduct on-site repair tests, time constraints, costs, and availability of equipment must be considered, and there are limitations in performing them selectively depending on the conditions of the site where the repair test is performed. Therefore, the applicability and limitations of each field hydraulic test must be considered in order to properly derive the hydrogeological characteristics of the aquifer.

Representative test methods performed in the field include slug tests, pumping tests, and injection tests. These hydraulic tests can be explained by the simple principle of applying hydraulic stimulation to the well under investigation and observing the aquifer response. Tests can be differentiated. For example, based on the continuity of stimulation applied to the well, it can be divided into an instantaneous water level change test of temporary stimulation and a constant pressure/constant rate test of continuous stimulation, and a positive water/injection test depending on the type of stimulation or observation location. Depending on this, it can be divided into single-hole test and multi-hole test.

However, currently, systems for determining hydraulic characteristics only include groundwater sampling functions by underground depth, and groundwater level observations required for groundwater flow analysis are not possible. In addition, in order to check the permeability of the underground medium, which is important when analyzing groundwater flow, water is injected using a separate packer during drilling surveys to calculate hydraulic conductivity, which has the disadvantage of taking a lot of time and money.

Therefore, pressure sensors are installed in monitoring sections for each depth, isolated through multiple packers within a single borehole, to measure groundwater levels in real time, and to measure the hydraulic conductivity of the underground medium quickly and inexpensively by injecting water or momentarily pumping groundwater. There is a need for a monitoring system that can calculate it.

Registered Patent Publication No. 10-1646987 (Publication date: August 23, 2016)

Accordingly, the present invention measures the groundwater level in real time by installing a pressure sensor in a monitoring section for each depth isolated through multiple packers within a single borehole, and quickly measures the hydraulic conductivity of the underground medium by injecting water or momentarily pumping groundwater. We aim to provide a monitoring system for underground media hydraulic properties that can be calculated at low cost.

To achieve this purpose, the underground medium hydraulic properties monitor system according to the present invention is an underground medium hydraulic properties monitor system for observing groundwater flow in the underground rock. It is installed between a vertical hole formed by drilling to a depth, a connection pipe, which is a pipe-shaped member formed at a certain length, and the outer peripheral surface of the connecting pipe and the inner peripheral surface of the vertical hole, and expands or absorbs water therein as it is injected or absorbed. A packer expander that contracts and expands the packer so that the packer fills the space between the outer peripheral surface of the connection pipe and the inner peripheral surface of the vertical hole, so that the upper and lower parts of the vertical hole are isolated based on the position of the packer. , a vacuum pump for pumping water into the space isolated by the packer among the vertical holes, a water injection unit for injecting water into the space isolated by the packer, and a water injection unit injected into the space isolated by the packer. It contains a pressure measuring unit that measures the pressure of water.

Here, the packer is preferably installed in plural pieces along the height direction of the vertical hole to be spaced apart from each other, so that the space isolated by the packer is formed in plural pieces along the height direction of the vertical hole, and each monitoring section is located at a different height. In addition, the hydraulic conductivity can be independently calculated according to the measurement of the groundwater level for each monitoring section.

In this case, the packer expander and the packer are preferably connected by a packer expansion pipe, and the packer expander expands the packer by injecting water into the packer through the packer expansion pipe, and the packer expander is connected to the monitoring section and water injection. Connected to a hose, the packer expander injects water into the monitoring section through the water injection hose, and when the packer expander injects water into the monitoring section, the packer expander acts as the water injection unit, The packer expander can be a packer expansion means or a water injection unit depending on the mode of action.

At this time, the vacuum pump is preferably connected to the monitoring section with a pumping hose, so that the vacuum pump pumps groundwater inside the monitoring section through the pumping hose, and the pumping hose and the water injection hose meet each other and are integrated. It is formed as a single pumping and injection hose and can be inserted into the vertical hole.

The underground medium hydraulic characteristics monitoring system according to the present invention measures the groundwater level in real time by installing a pressure sensor in a monitoring section for each depth isolated through multiple packers within one borehole, and injects water or instantaneously pumps groundwater. It has the effect of quickly and inexpensively calculating the hydraulic conductivity of the underground medium.

Figure 1 is a conceptual diagram of an underground medium hydraulic properties monitoring system according to the present invention.
Figure 2 is a partial perspective view showing the packer and connector in Figure 1.
Figure 3 is a cross-sectional view of a portion cut along line AA' in Figure 1.

The specific structural or functional descriptions presented in the embodiments of the present invention are merely illustrative for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention may be implemented in various forms. In addition, it should not be construed as being limited to the embodiments described in this specification, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to the attached drawings.

As shown in FIG. 1, the underground medium hydraulic characteristics monitoring system according to the present invention includes a vertical hole 10, a connecting pipe 20 inserted into the vertical hole 10, and packers 31, 32, and 33, It includes a packer expander (40), a vacuum pump (50), a water injection unit (60), and a pressure measurement unit (70).

The vertical hole 10 is a hole formed in the form of a vertical tunnel, as shown in Figure 1 or Figure 2, pointing vertically downward at a point where investigation of the underground bedrock R is required. At this time, the vertical hole 10 may be formed to a point where investigation of the hydraulic properties of the underground rock mass (R) is required, and the hydraulic properties of the underground rock mass (R) at each point may vary depending on the height inside the vertical hole (10). You can.

As shown in FIG. 1, the connection pipe 20 is a pipe-shaped member manufactured to be smaller than the diameter of the vertical hole 10 and inserted into the vertical hole 10. Various hoses, sensor connection cables, etc. are inserted into the connector 20 to measure repair characteristics, which will be described later.

As shown in FIG. 1, the packers 31, 32, and 33 are installed between the outer circumferential surface of the connection pipe 20 and the inner circumferential surface of the vertical hole 10, and are members that expand or contract as water is injected or absorbed therein. am.

The packers 31, 32, and 33 are elastic members that surround the connecting pipe 20. When water is injected and expanded, the space between the connecting pipe 20 and the vertical hole 10 is expanded as shown in FIG. 2. will be filled completely.

Therefore, when the packers (31, 32, and 33) expand, the upper and lower spaces of the vertical hole (10) become airtight based on the positions of the packers (31, 32, and 33), preventing the movement of water between the upper and lower spaces. It can be prevented. Therefore, by measuring the pressure of groundwater or water filled in the upper space and lower space divided based on the positions of the packers 31, 32, and 33, the hydraulic characteristics of the upper space and lower space can be measured independently.

As shown in FIG. 1, the packer expander 40 is connected to the packers 31, 32, and 33 with a packer expansion pipe 41, and injects water into the packers 31, 32, and 33 to expand the packers 31, 32. ,33) It is a device that expands. Therefore, a pump for supplying water can be provided.

The vacuum pump 50 is a device that pumps groundwater filled in the space surrounded by the packers 31, 32, and 33 or water injected from outside, or collects groundwater and pumps it so that it can be examined as a sample.

The water injection unit 60 injects water from the outside into the space surrounded by the packers 31, 32, and 33 to measure the water pressure inside the space surrounded by the packers 31, 32, and 33. It is a device that allows the repair characteristics to be identified.

As shown in FIG. 1, the pressure measuring unit 70 is installed inside the space surrounded by the packers 31, 32, and 33 and calculates the pressure measurement value using signals received from pressure sensors 71, 72, and 73. It is a device. By installing the pressure measuring unit 70 including the pressure sensors 71, 72, and 73, the groundwater is sealed in a state where the pressure is maintained and the pressure status of the groundwater distributed underground can be immediately monitored in real time even without sampling. It can be figured out.

In particular, as shown in FIGS. 1 and 2, a plurality of packers 31, 32, and 33 are installed to be spaced apart from each other along the height direction of the vertical hole 10, thereby creating a space isolated by the packers 31, 32, and 33. is formed in plural numbers along the height direction of the vertical hole 10 to form monitoring sections 11, 12, and 13 located at different heights, and each monitoring section 11, 12, and 13 is monitored according to the measurement of groundwater level. Calculations of hydraulic conductivity can be made completely independent of each other.

The monitoring sections 11, 12, and 13 are more specifically, looking at the embodiment shown in FIG. 1, the first to third monitoring sections 11, 12, and 13 are formed in layers in a vertical direction. .

However, the number of monitoring sections (11, 12, and 13) is not necessarily limited to three as shown in FIG. 1, and may vary depending on the number of packers (31, 32, and 33) installed, and may vary depending on the height of the underground In terrain where the characteristics of the rock mass (R) change significantly, it may be desirable to install more packers (31, 32, 33) more closely, and if there is a specific section where the characteristics of the underground rock mass (R) vary greatly depending on the height, that section A large number of packers 31, 32, and 33 may be placed intensively. However, the following description will be made assuming that the monitoring section is limited to the first to third monitoring sections 11, 12, and 13.

Since the first to third monitoring sections 11, 12, and 13 are formed at different depths, if the rock repair characteristics of each monitoring section 11, 12, and 13 are independently investigated, the repair of the underground rock R according to the depth can be determined. Because the characteristics can be investigated, the hydraulic characteristics of the underground rock mass (R) can be three-dimensionally understood to a great depth.

Therefore, in the underground medium hydraulic characteristics monitoring system according to the present invention, so that the hydraulic characteristics of the underground rock mass (R) in each of the first to third monitoring sections 11, 12, and 13 can be independently investigated, the packer expander described above (40), the vacuum pump 50, and the water injection unit 60 are capable of selectively injecting or pumping water into the first to third monitoring sections 11, 12, and 13, respectively, and a packer expansion pipe ( 41), the pumping hose 51, and the water injection hose 61 are connected to each monitoring section 11, 12, and 13 to selectively inject or pump water.

The packer expander 40 and the first to third packers 31, 32, and 33 are connected to the packer expansion pipe 41, and the packer expander 40 is connected to the packer 31, 32, and The packers 31, 32, and 33 are expanded by injecting water into the 33), and the packer expander 40 is connected to the first to third monitoring sections 11, 12, and 13, respectively, through a water injection hose 61. , the packer expander 40 can selectively or simultaneously inject water into each of the first to third monitoring sections 11, 12, and 13 through the water injection hose 61.

Therefore, when the packer expander 40 injects water into the first to third monitoring sections 11, 12, and 13, the packer expander 40 acts as the water injection unit 60, so that the packer expander 40 acts as a water injection unit 60. Depending on the form, it can be either a packer expansion means or a water injection unit.

In other words, in terms of the action performed by each component constituting the entire system, the packer expander 40 and the water injection unit 60 can be viewed as distinct components, and may actually be implemented as independent devices. , as in the embodiment shown in FIG. 1, the packer expander 40 may perform both functions.

In order to show in the drawing that one configuration can perform all the functions performed by two separate configurations, in FIG. 1, the water injection unit 60 is shown as being installed separately inside the packer expander 40. However, in reality, the packer expander 40 may be configured to perform both packer expansion and water injection operations as needed.

And the vacuum pump 50 is connected to each of the first to third monitoring sections 11, 12, and 13 with a positive hose 51, and the vacuum pump 50 is connected to the first to third monitoring sections 11, 12, and 13 through the positive hose 51. Groundwater is pumped inside each of the monitoring sections (11, 12, 13), and the pumping hose (51) and the water injection hose (61) meet each other and are integrated to form one pumping and injection hose (91, 92, 93). and can be inserted into the connector 20.

That is, as shown in FIG. 1, the water injection hose 61 extends from the packer expander 40 and water injection unit 60 to the inside of the connection pipe 20, and the inside of the connection pipe 20 from the vacuum pump 50. The pumping hoses 51 extending to each other have different starting points from the packer expander 40 and the vacuum pump 50, but inside the connection pipe 20, as shown in FIG. 1, the pumping and injection hoses are one pipe. They can be merged with each other as (91,92,93).

At this time, the pumping and injection hoses (91, 92, 93), which are a combination of the water injection hose (61) and the pumping hose (51), can be used both when pumping water and when injection of water is required, so they can be used inside the connection pipe (20). can be organized concisely, and significant reductions in facility maintenance and production costs are possible.

Of course, since the first to third section pumping and injection hoses (91, 92, 93) must be connected to each of the first to third monitoring (11, 12, 13) sections, the first to third section pumping and injection hoses (91, 92, 93) must be connected to each of the first to third monitoring sections (11, 12, 13) Injection hoses 91, 92, and 93 are installed to match the number of first to third monitoring sections 11, 12, and 13.

Therefore, referring to FIG. 3, which is a cross-sectional view of the cross section indicated by AA' in FIG. 1, the pumping and injection hoses 91, 92, and 93 are connected to the first to third monitoring sections 11, 12, and 13, respectively. It is provided with a third pumping and injection hose (91,929,93).

And the measurement signals of the first to third pressure sensors (71, 72, 73) and the first to third pressure sensors (71, 72, 73) in each of the first to third monitoring sections (11, 12, and 13). A transmission cable is installed for each pressure sensor.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible without departing from the technical spirit of the present invention as is known in the technical field to which the present invention pertains. It will be clear to those who have the knowledge of.

L: Groundwater level R: Underground rock
10: vertical hole 11: first monitoring section
12: 2nd monitoring section 13: 3rd monitoring section
20: connector 31: first packer
32: 2nd packer 33: 3rd packer
40: Packer expander 41: Packer expansion tube
50: vacuum pump 51: pumping hose
60: water injection unit 61: water injection hose
70: pressure measurement unit 71: first pressure sensor
72: second pressure sensor 73: third pressure sensor
75: Pressure measurement signal cable 80: Data server
91: 1st section pumping and injection hose 92: 2nd section pumping and injection hose
93: Section 3 pumping and injection hose

Claims (4)

An underground medium hydraulic properties monitor system for observing groundwater flow in underground rock,
A vertical hole formed by drilling underground to a certain depth in an area where observation of groundwater flow and permeability of the underground medium is required;
a pipe-shaped member formed of a certain length and inserted into the vertical hole;
a packer installed between the outer circumferential surface of the connection pipe and the inner circumferential surface of the vertical hole and expanding or contracting as water is injected or absorbed therein;
a packer expander that expands the packer to fill the space between the outer peripheral surface of the connection pipe and the inner peripheral surface of the vertical hole, so that the upper and lower parts of the vertical hole are isolated based on the position of the packer;
a vacuum pump for pumping water into a space isolated by the packer among the vertical holes;
a water injection unit that injects water into the space isolated by the packer;
A pressure measurement unit that measures the pressure of water injected into the space isolated by the packer with the water injection unit. According to paragraph 1,
A plurality of the packers are installed to be spaced apart from each other along the height direction of the vertical hole,
The space isolated by the packer is formed in plural numbers along the height direction of the vertical hole, forming a monitoring section each located at a different height,
An underground medium hydraulic characteristics monitor system, characterized in that the hydraulic conductivity is independently calculated according to the measurement of the groundwater level for each monitoring section. According to paragraph 2,
The packer expander and the packer are connected by a packer expansion tube, and the packer expander expands the packer by injecting water into the packer through the packer expansion tube,
The packer expander is connected to the monitoring section and a water injection hose, and the packer expander injects water into the monitoring section through the water injection hose,
When the packer expander injects water into the monitoring section, the packer expander acts as the water injection unit,
A system for monitoring underground medium hydraulic properties, characterized in that the packer expander is a packer expansion means or a water injection unit depending on the mode of action. According to paragraph 3,
The vacuum pump is connected to the monitoring section with a pumping hose, and the vacuum pump pumps groundwater inside the monitoring section through the pumping hose,
An underground medium hydraulic properties monitor system, wherein the pumping hose and the water injection hose are integrated while meeting each other to form a single pumping and injection hose and inserted into the vertical hole.

Images