Underground reserve depot and storage depot system

Abstract

The utility model discloses an underground reserve depot and a depot system, and relates to the technical field of underground resource reserve. The internal cavern of the underground reserve warehouse comprises a construction roadway and a reserve cavern, positioning structures distributed in an array mode are arranged in at least part of the internal cavern, and the positioning structures are used for positioning measuring lines for installing transient electromagnetic instruments, so that the measuring lines are spaced by preset distances at different detection position time. According to the scheme, at least the anti-leakage capacity of the underground reserve warehouse can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of underground resource storage, and in particular to an underground storage depot and a storage depot system. Background Art

[0002] Underground energy storage is a technology that utilizes deep underground space to store large-scale resources. It is currently the main method of international resource storage and is of great significance to ensuring national resource security and strategic material security.

[0003] Underground storage depots need to construct caverns in the strata. There are cracks in the surrounding rock of the caverns, so the stored resources often leak through the cracks, resulting in failure to meet the technical requirements for storage. In related technologies, the inventors use transient electromagnetic methods to detect crack water to determine the distribution of cracks, and grout the cracks to seal them, so as to achieve the purpose of effectively storing resources. However, in practice, even if the above technical means are used, leakage is still found in underground storage depots. Utility Model Content

[0004] The present application provides an underground storage reservoir and a storage reservoir system, which can at least improve the anti-leakage capability of the underground storage reservoir.

[0005] In a first aspect, an embodiment of the present application provides an underground storage depot. The internal cavern of the underground storage depot includes a construction tunnel and a storage cavern, and at least part of the internal cavern is provided with a positioning structure distributed in an array, and the positioning structure is used to position the measuring line of the transient electromagnetic instrument so that the measuring line is separated by a preset distance at different detection positions.

[0006] In the underground reserve disclosed in the embodiment of the present application, a positioning structure is set in the internal cavern of the underground reserve, each positioning structure corresponds to a detection position of the survey line, and the positioning structures are arranged in an array distribution, so that the survey line can be positioned by different positioning structures at different detection positions, and the preset distance is ensured. In this way, the layout accuracy of the survey line during the detection process can be improved, and the survey line can be accurately placed at the expected detection position, thereby ensuring that the detection area covers the expected range of the rock mass around the reserve cavern, and ultimately the detection effect and quality are improved.

[0007] Compared with the related art, the underground storage depot disclosed in the embodiment of the present application can effectively avoid the occurrence of missed detections by improving the detection effect and quality through the structural layout of the relevant positioning structure, thereby improving the overall anti-leakage capability of the underground storage depot.

[0008] As an optional embodiment, the positioning structure includes a protrusion or a depression built by concrete, and the protrusion or the depression is used to hold and position the measuring line.

[0009] As an optional embodiment, the positioning structure includes a marking area defined by marking lines.

[0010] As an optional embodiment, the positioning structure on the side wall of the inner cavern is a protrusion and is inclinedly arranged away from the bottom plate of the inner cavern.

[0011] As an optional embodiment, at least part of the internal caverns of the underground storage depot have support slopes arranged at the corners of the walls, and the support slopes are inclined at a preset angle relative to the horizontal plane to place a survey line for oblique detection.

[0012] As an optional embodiment, the angle between the supporting inclined plane and the horizontal plane ranges from 45° to 75°.

[0013] As an optional embodiment, along the width direction of the internal cavern, the positioning structures on the bottom plate of the internal cavern are spaced 3m to 7m apart from each other.

[0014] As an optional embodiment, the positioning structure includes a first positioning portion and a second positioning portion, the first positioning portion is used to position the transmitting coil of the installed measuring line, and the second positioning portion is used to position the receiving coil of the installed measuring line. In the same positioning structure, the first positioning portion and the second positioning portion are spaced a preset distance along the axial direction of the internal chamber.

[0015] As an optional embodiment, in the same positioning structure, the first positioning portion and the second positioning portion are spaced 5 m to 15 m apart.

[0016] As an optional embodiment, when the positioning structure is a protrusion or a depression built by concrete, the first positioning portion is square and the second positioning portion is circular.

[0017] In a second aspect, an embodiment of the present application provides a storage system, including the underground storage tank described in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0019] In the attached picture:

[0020] Figure 1 A flow chart of a water-stopping construction method for an underground storage reservoir disclosed in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of an underground storage reservoir disclosed for some embodiments of the present application;

[0022] Figure 3A schematic diagram of the working principle of performing detection operations in a storage cavern disclosed in some embodiments of the present application;

[0023] Figure 4 A schematic diagram of the distribution of detection areas for detection operations performed in a storage cavern disclosed in some embodiments of the present application;

[0024] Figure 5 A schematic diagram of the distribution of detection areas for performing detection in a water curtain tunnel disclosed in some embodiments of the present application;

[0025] Figure 6 A schematic diagram of the arrangement of the survey line of the transient electromagnetic instrument disclosed in some embodiments of the present application;

[0026] Figure 7 A schematic diagram of the coordination of the measuring line on the bottom plate disclosed in some embodiments of the present application;

[0027] Figure 8 A schematic diagram of the coordination of the measuring line on the side wall disclosed in some embodiments of the present application;

[0028] Fig. 9 This is a schematic diagram of the coordination of the measuring lines in the corners of a wall disclosed in some embodiments of the present application.

[0029] Description of reference numerals:

[0030] 10-reserve cavern, 20-construction tunnel, 30-water curtain tunnel, 30a-horizontal water curtain hole, 30b-vertical water curtain hole, 40-vertical shaft, 50-surveying line, 51-transmitting coil, 52-receiving coil, 60-positioning structure, 61-first positioning part, 62-second positioning part,

[0031] B-base plate, W-side wall, C-corner, C1-support slope, S-detection area. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0033] In order to facilitate the understanding of the underground storage depot and storage project provided in the embodiments of the present application, the relevant technologies are first introduced in combination with application scenarios.

[0034] In view of the problem of leakage in underground storage depots that have adopted transient electromagnetic method to detect cracks and grouting to seal them, the inventors found through research that the problem is mainly caused by the fact that the detection area during the detection operation does not completely cover the rock mass around the storage cavern. In detail, when performing the detection operation, the measuring line of the transient electromagnetic instrument is moved manually between different detection positions, but the manually selected detection positions are usually determined by visual or self-feeling to place the measuring line, which results in the difference between the distance of the measuring line at different detection positions and the preset interval distance, and the detection area does not meet the technical requirements, resulting in poor detection results.

[0035] In view of this, some embodiments of the present application provide an underground storage depot, in which a positioning structure is set in the internal cavern of the underground storage depot, and the positioning structure is used to locate the survey line on which the transient electromagnetic instrument is installed, so as to improve the layout accuracy of the survey line during the detection process, thereby ensuring that the detection area covers the expected target range and optimizing the detection effect.

[0036] For ease of understanding, the present application first describes, through some embodiments, the inventor's technical solution of using transient electromagnetic method to detect leakage channels of storage caverns and improve the anti-leakage capability of storage caverns.

[0037] In the related technology, in order to inject grout to seal the leakage channel of the storage cavern, the leakage location is usually determined by monitoring the water level outside the cavern and observing the water seepage inside the cavern, and then the sealing operation is carried out. However, in practice, even if the leakage channel is sealed by the above means, the underground storage depot still leaks.

[0038] After research, the inventors found that the above problems are mainly caused by the inability to effectively detect the leakage channels in the rock mass around the storage cavern. In detail, in the related art, the leakage channels of the storage cavern are mainly determined by monitoring the water level outside the cavern and observing the water seepage inside the cavern. However, the above methods cannot accurately determine the distribution of the leakage channels, and often miss detection and misdetection occur, which makes it impossible to effectively block the leakage channels. Therefore, the storage depot is prone to obvious leakage problems after use.

[0039] In view of this, some embodiments of the present application provide a water-stopping construction method for an underground storage reservoir.

[0040] See also Figure 1 to Figure 9 , the water-stopping construction method disclosed in some embodiments of the present application comprises the following steps:

[0041] S101, in the storage cavern 10 of the underground storage depot, a transient electromagnetic instrument is used to detect the fissure water in the surrounding rock nearby to determine the distribution position of the leakage channel.

[0042] During the construction of an underground storage depot, a construction tunnel 20 is usually excavated from the ground. The construction tunnel 20 extends in depth and horizontal directions, and then a water curtain tunnel 30 and a storage cavern 10 are further excavated in the construction tunnel 20. The water curtain tunnel 30 is used to form a water curtain, and the storage cavern 10 is the underground space in the storage depot for storing resources.

[0043] It should be noted that the transient electromagnetic method (TEM), also known as the time domain electromagnetic method, uses an ungrounded loop or grounded line source to emit a pulsed magnetic field underground. During the interval of a pulsed magnetic field, a coil or grounding electrode is used to observe the secondary eddy current field to obtain geoelectric characteristics at different depths to detect underground geological conditions. Since transient electromagnetics are highly sensitive to low-resistance bodies (water-containing bodies), they can detect the distribution of groundwater, and accordingly, fissure water distributed in rock fissures can also be detected.

[0044] Therefore, after the construction of the reserve cavern 10, the fissure water in the surrounding rock near the reserve cavern 10 can be detected in time or after a period of construction by using a transient electromagnetic instrument, that is, by using a transient electromagnetic method, to detect the distribution of the fissure water in the rock mass, and use the distribution of the fissure water (such as the distribution path) to characterize the distribution of the fissures in the rock mass, so as to find the distribution position of the leakage channel. Among them, the leakage channel in the embodiment of the present application refers to the fissures in the rock mass that are connected or nearly connected to the reserve cavern 10, and the resources in the reserve cavern 10 will leak through these fissures.

[0045] like Figure 3 and Figure 4 As shown, it shows a specific embodiment of detecting leakage channels in the storage cavern 10 by transient electromagnetic method, specifically, the detection operation is performed in the vertical downward, oblique downward or horizontal direction. It is worth noting that Figure 3 The distribution of dots and dashes in the graph represents the propagation and distribution path of the electromagnetic signal.

[0046] Of course, in order to avoid the loss of the detection area S and optimize the detection quality, some further means can be used. For example, the detection times of the transient electromagnetic instrument are increased, and the detection is performed in the direction toward the top of the reserve cavern 10 or obliquely upward, so as to detect the fissure water in the entire circumference of the reserve cavern 10, so as to obtain the distribution of the leakage channels of the surrounding rock in the entire circumference of the reserve cavern 10.

[0047] Compared with related technologies such as monitoring water levels outside the cave and observing water seepage inside the cave, the transient electromagnetic method can detect leakage channels that are easily missed through its highly sensitive detection of fissure water, thus providing more comprehensive and accurate detection results.

[0048] At the same time, according to the structure detected by the transient electromagnetic method, compared with the direct observation in the storage cavern 10 by the related technology, the connection port of the leakage channel in the storage cavern 10 can be determined more directly, which can improve the detection efficiency and of course the accuracy, and avoid false detection and missed detection.

[0049] In addition, it is worth noting that the cracks that are closely connected to the reserve cavern 10 usually do not seep water and cannot be observed by related technologies. However, the water-stopping construction method disclosed in the embodiment of the present application can detect the cracks that are closely connected to the reserve cavern 10, that is, it can avoid missed detection, thereby avoiding the risk of leakage caused by this series of cracks developing into leakage channels.

[0050] S102, injecting grout into the leakage channel in the reserve cavern 10 to block the leakage channel.

[0051] According to the distribution position of the leakage channel, the position of the connection port between the leakage channel and the storage cavern 10 can be found in the storage cavern 10, and then grouting can be injected into the leakage channel through the connection port to achieve the blocking of the leakage channel. Since the leakage channel that is easily missed by related technologies is also blocked by grouting, the overall anti-leakage capability of the underground storage depot is improved.

[0052] It is worth noting that in the related art, the leakage channel is judged by observing inside and outside the reserve cavern 10, and it is often necessary to perform multiple judgment processes on the leakage channel. For example, after observing a part of the leakage channel, grouting can be performed, and then another part of the leakage channel is observed, and grouting is performed again, and it continues until basically no water seepage is observed. Repeating the above process repeatedly will bring a large economic cost burden. The water-stopping construction scheme of the embodiment of the present application can quickly determine the distribution of almost all leakage channels through the transient electromagnetic method, and then the grouting and plugging process can be specifically implemented, avoiding multiple repetitions of the same process as in the related art, thereby reducing operating costs.

[0053] From the above analysis, it can be seen that the water-stopping construction method disclosed in the embodiment of the present application detects the distribution of fissure water in the rock mass around the reserve cavern 10 through the transient electromagnetic method to obtain the distribution position of the leakage channel, and in particular, it can quickly find the connection port of the leakage channel in the reserve cavern 10. Compared with related technologies, it can effectively avoid the problems of missed detection and false detection, thereby providing conditions for subsequent grouting and plugging operations to ensure that the leakage channel is grouting in a targeted manner to achieve plugging, and ultimately improve the overall leakage prevention capability of the underground reserve depot, and achieve long-term, safe and economical storage of resources.

[0054] It is worth pointing out that underground storage tanks that use underground water seal technology have a greater risk of leakage, and the water-stopping construction method disclosed in the embodiment of the present application is applied to water-seal type underground storage tanks, which can also effectively reduce the risk of leakage.

[0055] As an optional embodiment, after grouting the leakage channel in the reserve cavern 10, the water-stopping construction method also includes: using a transient electromagnetic instrument to re-measure the fissure water in the nearby surrounding rock in the reserve cavern 10, and if it is determined that there is still a leakage channel connected to the reserve cavern 10, it is sealed by additional grouting.

[0056] It should be understood that the rock joints (i.e., cracks) will change due to external disturbances, and the flow of water in the cracks will also change, directly leading to changes in the water-rich conditions in the rock mass, which will change the distribution of the leakage channels of the rock mass near the storage cavern 10. In this regard, the embodiment of the present application can detect the fissure water by transient electromagnetic method after a period of construction, so that if new leakage channels are generated or leakage channels that have not been detected before due to poor water-rich conditions can be detected, thus avoiding missed detection, and then grouting is used to seal them to improve the anti-leakage ability of the underground storage depot, which is more reliable and stable when in use.

[0057] Exemplarily, the above-mentioned interval period can be selected within the range of 5 days to 45 days, such as 10 days, 20 days, 30 days, etc.

[0058] As an optional embodiment, after grouting the leakage channel in the storage cavern 10, the water-stopping construction method further includes: using a transient electromagnetic instrument to detect fissure water in at least part of the engineering tunnel of the underground storage reservoir toward the storage cavern 10, and if it is determined that there is still a leakage channel connected to the storage cavern 10, plugging it by grouting. The engineering tunnel in this example may include at least one of the construction tunnel 20, the water curtain tunnel 30, etc. For example, Figure 5 As shown, it shows a specific embodiment of detecting leakage channels in a water curtain tunnel 30 by using a transient electromagnetic method.

[0059] It should be understood that if the detection is only carried out in the reserve cavern 10 after excavation, it is difficult to achieve complete and accurate detection of the distribution of the leakage channels of the entire circumferential surrounding rock of the reserve cavern 10, or even if the detection is fully prepared, it will lead to excessive costs. In this regard, this example conducts detection in the engineering tunnels of the underground storage depot, and these engineering tunnels are usually distributed above the reserve cavern 10 or are roughly at the same level as the reserve cavern 10. In this way, it is easy to make the detection area S cover the reserve cavern 10 and its surrounding rock when the engineering tunnel is detected, so as to reliably detect the cracks around the reserve cavern 10 and avoid missed detection and false detection.

[0060] Specifically, Figure 2 and Figure 5 As shown, in the case of detection in the water curtain tunnel 30, the detection area S can cover the surrounding rock area near the upper side of the reserve cavern 10; Figure 2As shown, if the detection is performed in the construction tunnel 20, the detection area S can cover the surrounding rock area of ​​the reserve cavern 10 close to the side wall W (ie, the side in the horizontal direction).

[0061] Secondly, based on this example, it is only necessary to carry out detection operations in vertically downward, obliquely downward or horizontal directions toward the reserve cavern 10 in the engineering tunnel, so as to facilitate the placement of the measuring line 50 of the transient electromagnetic instrument, which is beneficial to improving the detection accuracy and avoiding the problem of high cost of detection operations in vertically upward, obliquely upward and other directions.

[0062] In addition, this example helps avoid missed detection by re-detecting the leakage channels of the surrounding rock around the storage cavern 10 in the engineering tunnel. If new leakage channels are found, they are sealed by grouting to further enhance the anti-leakage capability of the underground storage depot.

[0063] As an optional embodiment, before using a transient electromagnetic instrument to detect fissure water in nearby surrounding rocks in the storage cavern 10 of the underground storage reservoir, the water stopping construction method further includes:

[0064] In at least part of the engineering tunnel of the underground storage depot, a transient electromagnetic instrument is used to detect fissure water toward the pre-excavation area corresponding to the storage cavern 10, and the fissure conditions in the pre-excavation area are recorded;

[0065] According to the crack conditions, grouting is used to seal the cracks extending to the pre-excavation area in the corresponding engineering tunnel.

[0066] It should be understood that the excavation work of each engineering tunnel (usually blasting excavation) will damage the rock mass, and even change the distribution of cracks therein, and may also generate new cracks in the pre-excavation area corresponding to the reserve cavern 10. If the plugging operation is carried out after the reserve cavern 10 is excavated, in order to achieve the purpose of water stopping, it is necessary to pay extremely high operating costs and overcome extremely high operating difficulties. The reason is that, for example, the presence of groundwater in the rock mass and water injection from the water curtain hole will cause the head pressure in the reserve cavern 10 to be too high, resulting in poor plugging and water stopping effects; the reserve cavern 10 is often higher than 20m, and it is particularly difficult to place a grouting machine at a higher position.

[0067] In response to the above problems, this example conducts transient electromagnetic detection on the pre-excavation area of ​​the reserve cavern 10 in the engineering tunnel before the reserve cavern 10 is excavated. If cracks in the pre-excavation area are found to extend to the engineering tunnel, these cracks are sealed by grouting in the corresponding engineering tunnel. This can improve the strength of the pre-excavation area and reduce the number of cracks in the surrounding rock near the reserve cavern 10 after it is formed, which is equivalent to reducing the probability of formation of leakage channels in the surrounding rock of the reserve cavern 10, thereby further improving the leakage prevention capability of the underground storage depot.

[0068] It is worth mentioning that in the case of underground storage depots that store resources through water sealing technology, in this example, the cracks extending to the pre-excavation area can be sealed in the water curtain tunnel 30. This can effectively reduce the head pressure when sealing and stopping water after the excavation of the storage cavern 10 is completed, thereby reducing the difficulty of stopping water.

[0069] Furthermore, in order to reduce costs, a detection method with lower accuracy may be used for the operation. For example, detection is performed at axial intervals of 50 m in the corresponding engineering tunnel.

[0070] As an optional embodiment, before using a transient electromagnetic instrument to detect fissure water in the surrounding rock nearby in the storage cavern 10 of the underground storage reservoir, the water stopping construction method further includes: using a transient electromagnetic instrument in at least part of the engineering tunnel of the underground storage reservoir toward the pre-excavation area corresponding to the storage cavern 10 to detect fissure water, and recording the fissure conditions in the pre-excavation area;

[0071] Determining the distribution position of the leakage channel includes: checking the corresponding parts in the reserve cavern 10 according to the crack situation, and if additional cracks are found, they are determined to be new leakage channels.

[0072] It should be understood that during the construction of the underground storage depot, the cracks in the corresponding storage cavern 10 and the rock mass nearby are constantly changing. Some cracks exist by themselves, but are filled after the excavation of the storage cavern 10, or have less water inside, and may be missed.

[0073] In this regard, this example uses the crack conditions collected in the engineering tunnel before the excavation of the reserve cavern 10 to check the corresponding rock parts in the reserve cavern 10, aiming to find filled cracks or cracks with low water content, and use them as new leakage channels for grouting and sealing to avoid missed detection, thereby further improving the leakage prevention capability of the underground reserve.

[0074] As an optional embodiment, the engineering tunnel includes a water curtain tunnel 30; detecting fissure water in at least part of the engineering tunnel of the underground storage reservoir toward the pre-excavation area corresponding to the storage cavern 10 using a transient electromagnetic instrument includes at least one of the following:

[0075] Before the water curtain hole is constructed, a transient electromagnetic instrument is used in the water curtain tunnel 30 to detect fissure water toward the pre-excavation area;

[0076] After the water curtain hole is constructed and water is injected into the water curtain hole, a transient electromagnetic instrument is used in the water curtain tunnel 30 to detect fissure water toward the pre-excavation area.

[0077] It should be understood that the water curtain hole is a hole drilled into the rock mass in the water curtain tunnel 30 for water injection, so as to form a water curtain and improve the quality of the water curtain. Figure 2As shown, the water curtain hole can be divided into a horizontal water curtain hole 30a and a vertical water curtain hole 30b. In addition to the fact that the excavation of the water curtain tunnel 30 will affect the distribution of cracks in the pre-excavation area of ​​the corresponding reserve cavern 10, the drilling operation of the water curtain hole will also have some impact. Therefore, the transient electromagnetic method is used to detect the pre-excavation area before and after the construction of the water curtain hole, and the distribution of cracks in the pre-excavation area of ​​different construction periods is obtained, which is conducive to avoiding missed detection and false detection.

[0078] At the same time, the influence of water injection from the water curtain hole on the cracks in the pre-excavation area also needs to be considered. In the process of injecting water into the rock mass through the water curtain hole, the water-richness of the rock mass in the pre-excavation area gradually changes, which may generate new cracks, or the original cracks that are not rich in water may become more water-rich due to water injection, which will lead to the formation of leakage channels after the formation of the reserve cavern 10. In this regard, this example uses the transient electromagnetic method to detect the pre-excavation area before and after water injection in the water curtain hole, and obtains the distribution of cracks in the pre-excavation area of ​​different construction periods, which is conducive to avoiding missed detection and false detection.

[0079] It is worth noting that, in the embodiment of the present application, the drilling operation of the water curtain hole can be carried out simultaneously with the excavation operation of the reserve cavern 10 , or can be carried out before the excavation of the reserve cavern 10 .

[0080] As an optional embodiment, before using a transient electromagnetic instrument to detect fissure water in nearby surrounding rocks in the storage cavern 10 of the underground storage reservoir, the water stopping construction method further includes:

[0081] In at least part of the engineering tunnel of the underground storage depot, a transient electromagnetic instrument is used to detect fissure water toward the pre-excavation area corresponding to the storage cavern 10, and the fissure conditions in the pre-excavation area are recorded;

[0082] During the excavation of the reserve cavern 10 , grouting is performed to seal the cracks connected to the excavated reserve cavern 10 according to the crack conditions.

[0083] It should be understood that, as mentioned above, after the excavation of the reserve cavern 10 is completed, plugging the leakage channel in the reserve cavern 10 requires both extremely high operating costs and extremely high operating difficulties. Before the excavation of the reserve cavern 10, the crack conditions in the pre-excavation area have been recorded, and the crack conditions can be used as existing data as guidance for grouting and plugging cracks during the excavation of the reserve cavern 10. Based on this, costs can be saved and cracks can be quickly found and plugged.

[0084] As an optional embodiment, the water-stopping construction method also includes: when the reserve cavern 10 is excavated in layers, after each layer of excavation is completed, the fissure water in the surrounding rock is detected by a transient electromagnetic instrument, and the fissures are sealed by grouting. It should be understood that in this example, transient electromagnetic detection is performed after each layer of excavation is completed, which can not only achieve cross-coverage of the detection area S and improve the detection precision and accuracy through multiple detections, but also take advantage of the low height of the reserve cavern 10 during the excavation process of the front layer, especially in the first layer, so as to more easily complete the main grouting water-stopping operation to reduce the operation cost.

[0085] As an optional embodiment, the water-stopping construction method also includes: before the test, clearing obstacles and electromagnetic interference sources in the corresponding test section to improve the accuracy of subsequent transient electromagnetic testing. For example, if there is metal, water accumulation, power equipment operation, etc. in the surrounding area, it will have a great impact on the transient electromagnetic data collection, so these problems should be avoided as much as possible on site. During the test, the surrounding power equipment (excluding lighting) stops running; vehicles are prohibited from entering during the test process; if there is a lot of water accumulation in the bottom plate B, the water in the test area S should be drained before the test.

[0086] As an optional embodiment, the water-stopping construction method further includes: before grouting, determining the grouting amount according to the distribution form of the fissures. It should be understood that by detecting with a transient electromagnetic instrument, the approximate size of the fissures (including the leakage channel) can be judged by the distribution path and properties of the fissure water to determine the grouting amount, so as to avoid grouting too little and failing to achieve the plugging effect, and avoid grouting too much and destroying the stability of the surrounding rock, causing the fissures to become larger, or even causing new fissures to form due to squeezing.

[0087] As an optional embodiment, the water-stopping construction method further includes: after the vertical shaft 40 is excavated, the fissure water in the surrounding rock near the reserve cavern 10 is detected by a transient electromagnetic instrument, and the fissures are sealed by grouting. In the embodiment of the present application, the vertical shaft 40 can be excavated outside the reserve cavern 10, or it can be excavated during the excavation of the reserve cavern 10, and the embodiment of the present application does not limit it.

[0088] It should be understood that Figure 2 As shown, the excavation of the shaft 40 will also affect the rock mass at the corresponding part of the storage cavern 10 and cause damage, especially the distribution of cracks will be changed. In this example, after the excavation of the shaft 40 is completed, the surrounding rock near the storage cavern 10 is tested, and the distribution of cracks can be obtained more accurately, and then grouting and plugging can be performed, which can further improve the anti-leakage ability of the underground storage depot.

[0089] As an optional embodiment, the water-stopping construction method further includes: arranging a transient electromagnetic instrument measuring line 50 for detection at least one of the bottom plate B, the side wall W and the wall corner C of the internal cavern to be tested in the underground storage depot. The internal cavern in this example may include at least one of the storage cavern 10, the construction tunnel 20, the water curtain tunnel 30, etc.

[0090] It should be understood that in this example, the support effect of the inner wall surfaces at different positions of the internal cavern to be tested is utilized to facilitate detection in different directions. Specifically, by placing the measuring line 50 directly on the bottom plate B of the internal cavern to be tested, the detection range of the transient electromagnetic instrument can be mainly limited to the vertical downward direction; by vertically leaning the measuring line 50 against the side wall W of the internal cavern to be tested, the detection range of the transient electromagnetic instrument can be mainly limited to the horizontal direction; by tilting the measuring line 50 against the wall corner C of the internal cavern to be tested, the detection range of the transient electromagnetic instrument can be mainly limited to the oblique downward direction. In this way, the placement of the measuring line 50 is not completely manually supported by the tester, but utilizes the support effect of the inner wall surfaces of the internal cavern to be tested, which saves effort and can determine the direction based on these inner wall surfaces, thereby improving the detection accuracy.

[0091] As an optional embodiment, the water-stopping construction method further includes: after grouting, observing whether there is water seepage in the storage cavern 10, and if so, repeating the last transient electromagnetic detection operation to determine the unblocked leakage channel and grouting to block it, thereby improving the anti-leakage capability of the underground storage depot.

[0092] In another embodiment, if water seepage still exists in the reserve cavern 10 after grouting, other means such as geological sketching may be used to determine unblocked leakage channels.

[0093] The following is an example of a specific underground storage depot to illustrate the water-stopping construction method disclosed in the embodiment of the present application. For the convenience of writing, this example is not annotated with a figure mark.

[0094] The design capacity of the underground storage is 500×104m 3 , specifically including 3 construction tunnels, 10 reserve caverns, 17 vertical shafts and 8 water curtain tunnels.

[0095] Among them, 10 reserve caverns are arranged in parallel at 10° north-east, and every two reserve caverns are connected by tunnels to form a cavern tank, which is divided into 5 groups of cavern tanks. The design length of the reserve cavern is 923m, the design span is 20m, the cave height is 30m, and the cross-section shape is a straight wall circular arch. The design clear distance between the reserve cavern wall and the adjacent construction tunnel wall is 30m, and the design clear distance between two adjacent reserve caverns is 40m.

[0096] Each of the five groups of caverns is equipped with two operating shafts (a total of 10 operating shafts), which are located in the south-central part of the site; one of the shafts is equipped with an oil inlet pipeline, and the diameter of the shaft is 5m; the other shaft is equipped with an oil outlet pipeline and other process pipelines, instruments, cables and casings from the underground cavern to the ground, and the diameter of the shaft is also 5m. In addition, an instrument well and a water curtain water supply well are arranged on the top of the water curtain roadway, and the diameter of the shafts is 300mm.

[0097] A horizontal water curtain system is set up 25m above the top of the reserve cavern, which consists of a water curtain tunnel and water curtain holes. The spacing between the water injection holes is 10m to 20m, covering the entire cavern. The water curtain system is equipped with 8 water curtain tunnels, one is arranged vertically in the direction of the reserve cavern, and two are arranged parallel to the direction of the reserve cavern, with a total length of about 6188m. The lengths of water curtain tunnels S7 to S8 are both 775m, and the lengths of water curtain tunnels S1 to S6 are both 773m; the horizontal spacing between water curtain tunnels S1 to S6 is 155m to 160m. In order to improve ventilation conditions, a total of 5 ventilation shafts with a diameter of 5m are set at the north end of the reserve cavern.

[0098] The water-stopping construction method is implemented by using a TEM47 transient electromagnetic instrument, using a transmitter to transmit signals and a receiver to collect data.

[0099] The transmitter parameter settings are shown in Table 1 below:

[0100] transmitter TEM-47 Current waveform Dipole square wave, 50% space factor can be set between positive and negative square waves LOOP Multi-turn Shutdown current 1.1A Transmitter coil 2m×2m(64 turns)

[0101] Table 1

[0102] The receiver parameter settings are shown in Table 2 below:

[0103] Receiver PROTEM RECEIVER Time Gate 30 SYNC.MODE (synchronous mode) REF. (reference line synchronization) PEPETITIONG RATE (transmitting base frequency) 25 COIL TYPE 1D INTEGRATION(SEC.) 8 RX DEPLAY TIME 0 RX COIL AREA (receiving coil area) 31.4 GAIN Adjust according to the situation on site Off time According to the current, check the corresponding standard and adjust it appropriately according to the site conditions.

[0104] Table 2

[0105] Among them, the construction tunnels are divided into main and branch construction tunnels. During the inspection process: the main and branch construction tunnels are inspected in the horizontal direction of the left and right side walls, the left and right side wall corners are obliquely downward 60°, and the bottom plate centerline is downward, with a total of 5 groups of measurement lines; the reserve caverns 1 to 10 bottom plate centerline and 5m to the left and right of the centerline are inspected vertically downward, with a total of 3 groups of measurement lines; the water curtain tunnels S1 to S8 are inspected at an oblique downward 60° on the left and right side walls and the bottom plate centerline downward, with a total of 3 groups of measurement lines.

[0106] Analyze the test results:

[0107] Taking the detection results of the reserve cavern corresponding to branch construction tunnel 3 as an example, the statistical results of leakage channel analysis are shown in Table 3 below:

[0108]

[0109] Table 3

[0110] Among them, the water supply situation of the right side wall of branch construction tunnel 3 (mileage: 0+015~0+225m) is generally in a weak to moderately water-rich state, and locally in a strongly water-rich state; in the detection results of the right side wall, the high-resistance areas within the depth range of -30m~-50m and -90m~-100m are consistent with the positions of reserve caverns 6 and 7 after investigation; in the detection results of the right side wall inclined downward 60°, the high-resistance areas within the depth range of -34m~-58m are consistent with the position of reserve cavern 6 after investigation; in the detection results, the local area is in a strongly water-rich state (see Table 3 for details), and it is determined that the surrounding rock in this area is broken and the structural surface is developed; it is speculated that it is a leakage channel in branch construction tunnel 3 and a fissure water leakage channel between branch construction tunnel 3 and the reserve cavern.

[0111] The above is an explanation of the inventor's technical solution for detecting leakage in storage caverns using the transient electromagnetic method. Next, an explanation will be given of an underground storage depot with a positioning structure.

[0112] See also Figure 1 to Figure 9 In the underground storage depot disclosed in the embodiment of the present application, its internal caverns include a construction tunnel 20 and a storage cavern 10, and at least part of the internal caverns are provided with positioning structures 60 distributed in an array, and the positioning structures 60 are used to locate the measuring line 50 on which the transient electromagnetic instrument is installed, so that the measuring line 50 is spaced at a preset distance at different detection positions.

[0113] It should be understood that the transient electromagnetic instrument can be used to implement the detection operation through a variety of detection methods, such as large fixed source detection method, dipole coplanar detection method, dipole coaxial detection method, etc. No matter which detection method is used for detection, the measurement line 50 of the transient electromagnetic instrument needs to take into account the preset distance between different detection positions to ensure the coverage of the target rock mass by the detection signal and avoid problems such as missed detection and false detection.

[0114] In the related art, the measuring line 50 of the transient electromagnetic instrument is usually moved manually between different detection positions, but the manually selected detection positions are usually determined by visual inspection or self-feeling to place the measuring line 50, which results in a difference between the distance of the measuring line 50 at different detection positions and the preset interval distance, resulting in poor detection effect.

[0115] In this regard, by setting a positioning structure 60 in the internal cavern of the underground storage, each positioning structure 60 corresponds to a detection position of the measuring line 50, and the positioning structures 60 are arranged in an array distribution, so that the measuring line 50 can be positioned by different positioning structures 60 at different detection positions, and the preset distance is ensured. In this way, the layout accuracy of the measuring line 50 during the detection process can be improved, and the measuring line 50 can be accurately placed at the expected detection position, thereby ensuring that the detection area covers the expected range of the rock mass around the storage cavern 10, and ultimately achieving an improvement in the detection effect and quality.

[0116] Compared with the related art, the underground storage depot disclosed in the embodiment of the present application can effectively avoid the occurrence of missed detections while improving the detection effect and quality through the structural layout of the related positioning structure 60, thereby improving the overall anti-leakage capability of the underground storage depot.

[0117] The embodiments of the present application do not limit the array distribution of the positioning structure 60 in the internal cavity. For example, Figure 6 As shown, along the width direction of the inner cavity, adjacent positioning structures 60 are spaced apart by a preset distance L 1 , so that the positioning structures 60 are evenly distributed along the width direction of the internal cavity. For example, the positioning structures 60 can also be evenly distributed along the axial direction of the internal cavity. Of course, the positioning structures 60 can also be unevenly distributed in the internal cavity, and the layout can be adaptively adjusted according to actual working conditions.

[0118] It is worth mentioning that Figure 6 It is used to show the layout relationship of each detection position, but it is not a limitation on the layout of the measurement line 50. In some application scenarios, multiple transient electromagnetic instruments can be used to arrange multiple groups of measurement lines 50 at multiple detection positions for detection; in other application scenarios, only one transient electromagnetic instrument can be used. During detection, the measurement line 50 needs to be moved to another detection position after detection at one detection position. Figure 6 , that is, it is necessary to move L from a positioning structure 60 1 distance to another positioning structure 60.

[0119] The internal cavern of the embodiment of the present application may also include a water curtain tunnel 30, that is, the underground storage depot is a type that uses water seal technology to store resources. Of course, the internal cavern of the embodiment of the present application may not include the water curtain tunnel 30, that is, the underground storage depot of the embodiment of the present application includes other types besides using water seal technology.

[0120] Correspondingly, the aforementioned water-stopping construction method for the underground storage reservoir may further include: when using the transient electromagnetic instrument for detection, positioning and installing the measuring line 50 through the positioning structure 60 .

[0121] As an optional embodiment, the positioning structure 60 includes a marking area defined by a marking line. In this example, the marking line can be formed by manually drawing the marking area after the internal cavern of the relevant underground storage depot is excavated. This method is extremely low in cost and avoids the tester's self-feeling to select the detection position, which improves the convenience of placing the measuring line 50 to a certain extent, thereby improving the detection accuracy.

[0122] As an optional embodiment, the positioning structure 60 includes a protrusion or a depression built by concrete, and the protrusion or the depression is used to hold and position the measuring line 50. For example, Figure 7 As shown, it shows a recessed type positioning structure 60; Figure 8 and Fig. 9 As shown, a positioning structure 60 of a protrusion type is shown.

[0123] It should be understood that after the excavation of the internal cavern of the underground storage depot, concrete is usually laid on the inner wall surface to improve the strength, sealing and flatness of the cavern. In this example, a concave-convex structure for positioning and installing the measuring line 50 is formed by laying concrete. The concave-convex structure can play a positioning and limiting role on the measuring line 50, greatly improving the accuracy of the placement position, thereby ensuring that different detection positions are spaced at a preset distance and improving the accuracy of the entire detection process. In the process of laying concrete, the above-mentioned protrusions or depressions can be formed by a mold.

[0124] Furthermore, if Figure 8 As shown, the positioning structure 60 on the inner cave side wall W is a protrusion. With such a setting, when it is necessary to detect in the horizontal direction, the measuring line 50 can be hung on the protrusion of the side wall W. Since the vertically placed measuring line 50 overlaps the protrusion and there is friction between the two, it can be ensured to a certain extent that the measuring line 50 will not slide off the protrusion, thereby achieving the purpose of detecting without manual support.

[0125] Furthermore, the protrusion located on the side wall W of the internal cavern can be arranged to be inclined with its back facing the bottom plate B of the internal cavern. Under such a layout, when the measuring line 50 is hung on the protrusion, the protrusion will limit the measuring line 50 in the horizontal direction, thereby preventing the measuring line 50 from detaching from the protrusion, thereby improving the installation reliability of the measuring line 50 on the side wall W of the internal cavern.

[0126] In order not to affect the flatness of the inner wall surface of the internal cavity, the height dimension of the positioning structure 60 formed as a protrusion or a depression can be configured to be smaller.

[0127] As an optional embodiment, Fig. 9 As shown, at least part of the inner cavern of the underground storage has a supporting slope C1 arranged at its wall corner C, and the supporting slope C1 is inclined at a preset angle relative to the horizontal plane to place a measuring line 50 for oblique detection.

[0128] It should be understood that when the measuring line 50 needs to be inspected in the oblique downward direction at the corner C of the inner cave, the relevant technology usually manually supports the measuring line 50 to lean against the corner C of the inner cave, but the inclination angle of the measuring line 50 cannot be accurately controlled, which easily leads to missed detection and false detection. In addition, the inclination posture of the measuring line 50 needs to be manually supported by the inspector to maintain it, and his hand may shake and it is difficult to ensure stability, which will also lead to inaccurate detection results.

[0129] In this regard, the example supports the measuring line 50 through the supporting slope C1. As long as the measuring line 50 is placed on the supporting slope C1, the measuring line 50 can be tilted at a preset angle relative to the horizontal plane, thereby ensuring that the detection direction of the measuring line 50 is accurately directed toward the preset area diagonally downward, so as to achieve the detection target in the entire detection task system. In addition, based on the supporting effect of the supporting slope C1, the detection personnel no longer need to manually support, and can always ensure that the lateral direction is toward the same preset area for detection, avoiding the negative impact caused by the shaking of the hands of the detection personnel.

[0130] Furthermore, if Fig. 9 As shown, the positioning structure 60 can be arranged on the supporting inclined surface C1 to improve the compactness of the structure. In addition, such a layout is also convenient for simultaneous construction and reduces the operation process. Of course, the two can also be arranged separately.

[0131] As an optional embodiment, the angle between the support inclined plane C1 and the horizontal plane is in the range of 45° to 75°. Figure 3~Figure 5 As shown, when the transient electromagnetic instrument is performing detection operations, the detection range of its measuring line 50 is usually distributed in a fan shape, and when the measuring line 50 is placed at the corner C of the internal cave for detection, the tilted posture of the measuring line 50 will affect the coverage area of ​​its detection range. In this example, the angle between the supporting slope C1 and the horizontal plane is set within the above range. When the measuring line 50 of the transient electromagnetic instrument is placed on the supporting slope, it can prevent the detection area S corresponding to the internal cave corner C from being too close to or overlapping the detection area S in the vertical downward direction (or the horizontal detection area S), and being too far away from the detection area S in the internal horizontal direction, thereby avoiding the problem of missed detection.

[0132] Exemplarily, the angle between the supporting inclined surface C1 and the horizontal plane can be configured to be 50°, 55°, 60°, 65°, etc.

[0133] As an optional embodiment, along the width direction of the internal cavern, the positioning structures 60 on the internal cavern floor B are spaced 3m to 7m apart from each other. Figure 6 , where L 1 The value range is 3m~7m.

[0134] Such a layout can prevent the positioning structures 60 in the width direction of the internal chamber from being too dense or too sparse, and also indirectly ensure that when the detection positions determined by each positioning structure 60 are detected, the vertically downward detection areas S distributed along the width direction of the internal chamber will not be too dense, thereby wasting detection resources and causing excessive costs. At the same time, the vertically downward detection areas S distributed along the width direction of the internal chamber will not be too sparse, thereby causing missed detections.

[0135] For example, along the width direction of the internal cavern, the positioning structures 60 on the internal cavern floor B are spaced 4 m, 5 m, 5.5 m or 6 m apart from each other.

[0136] As an optional embodiment, the positioning structure 60 includes a first positioning portion 61 and a second positioning portion 62. The first positioning portion 61 is used to position the transmitting coil 51 of the installed measuring line 50, and the second positioning portion 62 is used to position the receiving coil 52 of the installed measuring line 50. In the same positioning structure 60, the first positioning portion 61 and the second positioning portion 62 are spaced a preset distance along the axial direction of the internal chamber.

[0137] It should be understood that the measuring line 50 of the transient electromagnetic instrument includes a transmitting coil 51 and a receiving coil 52. The positioning structure 60 in this example includes a first positioning portion 61 and a second positioning portion 62 respectively arranged corresponding to the transmitting coil 51 and the receiving coil 52. In this way, it is only necessary to arrange the first positioning portion 61 and the second positioning portion 62 in the area corresponding to the placement position of the transmitting coil 51 and the receiving coil 52, rather than arranging the entire positioning structure 60 in a larger range, so as to reduce the difficulty of arranging the first positioning portion 61 and the second positioning portion 62.

[0138] It is worth mentioning that the transmitting coil 51 and the receiving coil 52 of the measuring line 50 are usually arranged along the axial direction of the inner chamber, so the first positioning portion 61 and the second positioning portion 62 of the positioning structure 60 can also be arranged along the axial direction of the inner chamber accordingly.

[0139] Further, in the same positioning structure 60, the first positioning portion 61 and the second positioning portion 62 are spaced 5m to 15m apart. Figure 6 , where L 2 The value range is 5m~15m.

[0140] It should be understood that the distance between the first positioning portion 61 and the second positioning portion 62 in the same positioning structure 60 determines the arrangement spacing of the transmitting coil 51 and the receiving coil 52, which will affect the detection range of the measuring line 50 of the transient electromagnetic instrument. In this example, the spacing range between the first positioning portion 61 and the second positioning portion 62 can avoid the waste of detection resources due to a small detection interval, and can also avoid missed detection due to a too large detection interval.

[0141] For example, in the same positioning structure 60 , the first positioning portion 61 and the second positioning portion 62 may be spaced apart by 6 m, 7.5 m, 10 m, 12 m, or 13 m.

[0142] Furthermore, if Figure 7 As shown, when the positioning structure 60 is a protrusion or depression built by concrete, the first positioning portion 61 is square and the second positioning portion 62 is circular. It should be understood that the transmitting coil 51 of the transient electromagnetic instrument is usually square, and the square first positioning portion 61 in this example is suitable for positioning and matching with the transmitting coil 51; the receiving coil 52 of the transient electromagnetic instrument is usually circular, and the circular second positioning portion 62 in this example is suitable for positioning and matching with the receiving coil 52. Overall, the structural layout of this example can improve the matching stability and accuracy of the measuring line 50 and the positioning structure 60.

[0143] Of course, in other embodiments, the shapes of the first positioning portion 61 and the second positioning portion 62 can be adaptively matched and arranged according to the shapes of the transmitting coil 51 and the receiving coil 52 , respectively.

[0144] See also Figure 1 to Figure 9 Some embodiments of the present application provide a storage system, which includes the underground storage mentioned in any of the above-mentioned solutions, thereby having the beneficial effects of the above-mentioned underground storage, which will not be repeated here. In addition, the storage system may also include an above-ground production area and auxiliary production facilities.

[0145] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0146] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An underground storage depot, characterized in that: The internal caverns of the underground storage depot include construction tunnels and storage caverns. At least part of the internal caverns are provided with positioning structures distributed in an array. The positioning structures are used to locate the measuring lines for installing transient electromagnetic instruments so that the measuring lines are spaced by preset distances at different detection positions.

2. The underground storage depot according to claim 1, characterized in that: The positioning structure includes a protrusion or a depression built by concrete, and the protrusion or the depression is used to hold and position the measuring line; and / or, the positioning structure includes a marking area defined by a marking line.

3. The underground storage depot according to claim 2, characterized in that: The positioning structure on the side wall of the inner cavern is a protrusion and is arranged obliquely away from the bottom plate of the inner cavern.

4. The underground storage depot according to claim 1, characterized in that: At least part of the inner cavern of the underground storage has a supporting slope arranged at the corner of the wall, and the supporting slope is inclined at a preset angle relative to the horizontal plane to place the measuring line for oblique detection.

5. The underground storage depot according to claim 4, characterized in that: The angle between the supporting inclined plane and the horizontal plane ranges from 45° to 75°.

6. The underground storage depot according to any one of claims 1 to 5, characterized in that: Along the width direction of the internal cavern, the positioning structures on the bottom plate of the internal cavern are spaced 3m to 7m apart from each other.

7. The underground storage depot according to any one of claims 1 to 5, characterized in that: The positioning structure includes a first positioning portion and a second positioning portion, the first positioning portion is used to position and install the transmitting coil of the measuring line, and the second positioning portion is used to position and install the receiving coil of the measuring line. In the same positioning structure, the first positioning portion and the second positioning portion are spaced a preset distance apart along the axial direction of the internal chamber.

8. The underground storage depot according to claim 7, characterized in that: In the same positioning structure, the first positioning portion and the second positioning portion are spaced 5m to 15m apart.

9. The underground storage depot according to claim 7, characterized in that: When the positioning structure is a protrusion or a depression built by concrete, the first positioning portion is square and the second positioning portion is circular.

10. A reservoir system, characterized in that: Comprising the underground storage reservoir described in any one of claims 1 to 9.

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