Partitioned excavation structure of underground high-pressure gas storage

Abstract

The underground high-pressure gas storage partition excavation structure comprises an excavation starting end and an excavation stopping end, a first transition section, a cylindrical section and a second transition section which are sequentially connected are arranged between the excavation starting end and the excavation stopping end, a middle island round hole face is arranged in the first transition section, and a middle island round hole face is arranged in the second transition section. A maximum-diameter face is arranged at the joint of the first transition section and the cylindrical section, the middle island round hole face comprises a plurality of equally-divided and concentric first fan-shaped faces, a first excavation area is arranged between each first fan-shaped face and the excavation starting end, and a second excavation area is arranged between each first fan-shaped face and the maximum-diameter face. The maximum-diameter surface comprises a plurality of equally-divided and concentric second fan-shaped surfaces, and a third excavation area is arranged between each second fan-shaped surface and the middle island round hole surface, so that the phenomenon that the stress is greatly and frequently changed or concentrated in the excavation process of the first transition section is avoided; the excavation unloading gradient of the underground high-pressure gas storage is effectively controlled, and the slack ring range of the underground high-pressure gas storage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure gas storage reservoirs, in particular to a partitioned excavation structure of an underground high-pressure gas storage reservoir. Background Art

[0002] High-pressure gas storage is an important component of the new energy storage system. Traditional surface steel gas tanks are expensive, occupy a large area of ​​land, and have high safety risks. Underground artificial chambers have low investment costs, low dependence on geological conditions, and can be flexibly applied to areas with rich wind and solar energy or high electricity demand. They are one of the future trends in the site selection and development of new energy storage business.

[0003] However, high-pressure gas storage, especially underground artificial chambers, are large in scale and have high gas pressure. When designing the excavation structure, it is necessary to comprehensively consider the support cost and the peak gas storage pressure. Large-scale underground high-pressure gas storage has a large burial depth. The construction of large-scale underground gas storage with a large burial depth faces the severe problem of excavation stability. Differences in excavation structure design, such as excavation advance surface design, excavation partition number design, and excavation volume design, will cause the cavern stress to change frequently within a large range. The large and frequent changes in cavern stress will affect the stability of the underground high-pressure gas storage during excavation, affect the secondary stress adjustment process of the underground high-pressure gas storage, and thus cause stress-induced failure during the excavation of the underground high-pressure gas storage, which is not conducive to structural formation. Utility Model Content

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a partitioned excavation structure for an underground high-pressure gas storage reservoir, which can solve the problem that the design of a partial excavation structure will cause the cavern stress to change frequently within a large range.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] A partitioned excavation structure for an underground high-pressure gas storage reservoir comprises an excavation start end and an excavation end end, wherein a first gradient section, a cylindrical section, and a second gradient section are sequentially connected between the excavation start end and the excavation end end, wherein any radial cross-section of the first gradient section, the cylindrical section, and the second gradient section is circular, wherein a central island circular hole surface is provided in the first gradient section, and a maximum diameter surface is provided at the intersection of the first gradient section and the cylindrical section, wherein the diameter of the central island circular hole surface is 0.4 to 0.5 times the diameter of the maximum diameter surface, and the central island circular hole surface is 0.4 to 0.5 times the diameter of the maximum diameter surface. The island circular hole surface includes several equally divided and concentric first fan-shaped surfaces, a first excavation area is provided between each of the first fan-shaped surfaces and the excavation starting end, a second excavation area is provided between each of the first fan-shaped surfaces and the maximum diameter surface, the maximum diameter surface includes several equally divided and concentric second fan-shaped surfaces, the number of second fan-shaped surfaces is twice that of the first fan-shaped surfaces, a third excavation area is provided between each of the second fan-shaped surfaces and the middle island circular hole surface, and the second gradient section and the first gradient section are symmetrical about the center of the cylindrical section.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] An inner circular excavation area is provided at the center of the cylindrical section, and an outer circular excavation area is provided outside the inner circular excavation area. The diameter of the outer circular excavation area is equal to the diameter of the maximum diameter surface, and the diameter of the inner circular excavation area is 0.4 to 0.5 times the diameter of the outer circular excavation area. The inner circular excavation area includes a fourth excavation area and a fifth excavation area equally divided from top to bottom, and the outer circular excavation area includes a sixth excavation area and a seventh excavation area equally divided from top to bottom.

[0009] A plurality of gradual section footage surfaces are provided between the excavation starting end and the maximum diameter surface. The gradual section footage surfaces are parallel to the maximum diameter surface and the distance between two adjacent gradual section footage surfaces is equal.

[0010] A plurality of stepped cylindrical section footage surfaces are provided in the cylindrical section, and the cylindrical section footage surfaces include the fourth excavation area footage surface, the fifth excavation area footage surface, the sixth excavation area footage surface, and the seventh excavation area footage surface, wherein the distances between the seventh excavation area footage surface, the fifth excavation area footage surface, the sixth excavation area footage surface, and the fourth excavation area footage surface and the excavation starting end gradually increase, the distance between the seventh excavation area footage surface and the fourth excavation area footage surface is 30-50m, the distance between the fifth excavation area footage surface and the fourth excavation area footage surface is 24-40m, the distance between the sixth excavation area footage surface and the fourth excavation area footage surface is 12-20m, and the distances between two adjacent cylindrical section footage surfaces are equal.

[0011] The distance between two adjacent gradual section footage surfaces is 3 to 5 meters.

[0012] The distance between the footage surfaces of two adjacent cylindrical segments is 6 to 10 meters.

[0013] Compared with the prior art, the utility model has the following advantages and beneficial effects: by arranging a central island circular hole surface in the first gradient section, and dividing the central island circular hole surface into eight concentric first fan-shaped surfaces to form eight first excavation areas and second excavation areas, and dividing the maximum diameter surface into sixteen second fan-shaped surfaces to form sixteen third excavation areas, it is possible to avoid large-scale and frequent stress changes or stress concentration phenomena during the excavation of the first gradient section; by arranging the fourth excavation area, the fifth excavation area, the sixth excavation area and the seventh excavation area in the cylindrical section, and designing a stepped cylindrical section footage surface, the footage distance between the footage surfaces of two adjacent cylindrical sections is reasonably controlled, and the unloading gradient and the total amount of unloading in the excavation of large-section and large-volume underground high-pressure gas storage structures are effectively reduced, the damage depth of the surrounding rock of large-scale underground high-pressure gas storages is reduced, high stress concentration phenomena are avoided in underground high-pressure gas storages, the range of the relaxation zone of underground high-pressure gas storages is reduced, and the safe construction of underground high-pressure gas storages is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 This is a schematic diagram of the distribution structure of the first sector surface and the second sector surface of the utility model.

[0016] Figure 3 This is a schematic diagram of the distribution structure of the first excavation area and the second excavation area of ​​the utility model.

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the first excavation area of ​​the utility model.

[0018] Figure 5 This is a schematic diagram of the three-dimensional structure of the second excavation area of ​​the utility model.

[0019] Figure 6 This is a schematic diagram of the distribution structure of the third excavation area of ​​the utility model.

[0020] Figure 7 This is a schematic diagram of the three-dimensional structure of the third excavation area of ​​the utility model.

[0021] Figure 8 This is a schematic diagram of the distribution structure of the gradual section footage surface of the utility model.

[0022] Figure 9 This is a schematic diagram of the distribution structure of the inner circle excavation area and the outer circle excavation area of ​​the utility model.

[0023] Figure 10This is a schematic diagram of the distribution structure of the cylindrical segment footage surface of the utility model. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limiting the present invention.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0026] The utility model provides an underground high-pressure gas storage partition excavation structure, such as Figure 1 As shown, it includes an excavation starting end 1 and an excavation ending end 2. A first gradient section 3, a cylindrical section 4 and a second gradient section 5 are provided between the excavation starting end 1 and the excavation ending end 2. Any radial cross-section of the first gradient section 3, the cylindrical section 4 and the second gradient section 5 is circular. A center island circular hole surface 6 is provided in the first gradient section 3. A maximum diameter surface 8 is provided at the intersection of the first gradient section 3 and the cylindrical section 4. The diameter of the center island circular hole surface 6 is 0.4 to 0.5 times the diameter of the maximum diameter surface 8.

[0027] like Figure 2 As shown, the island circular hole surface 6 includes a plurality of equally divided and concentric first sector-shaped surfaces 61, as shown in FIG. Figure 3-Figure 5 As shown, a first excavation area 71 is provided between each first sector surface 61 and the excavation starting end 1 , and a second excavation area 72 is provided between each first sector surface 61 and the maximum diameter surface 8 .

[0028] In this embodiment, the upper semicircle and the lower semicircle of the central island circular hole surface 6 are respectively divided into four first sector-shaped surfaces 61, with a total of eight first sector-shaped surfaces 61. Excavation is carried out from the excavation starting end 1 to the upper side. After a first excavation area 71 located on the upper semicircle side of the central island circular hole surface 6 is excavated, the remaining seven first excavation areas 71 are excavated in sequence in a counterclockwise direction; the excavation process of the second excavation area 72 is similar to that of the first excavation area 71, and will not be repeated here.

[0029] like Figure 2 As shown, the maximum diameter surface 8 includes a plurality of equally divided and concentric second sector surfaces 81, and the number of the second sector surfaces 81 is twice that of the first sector surfaces 61. Figure 6 and Figure 7 As shown, a third excavation area 73 is provided between each second sector surface 81 and the central island circular hole surface 6 .

[0030] In this embodiment, the upper half and the lower half of the maximum diameter surface 8 are respectively divided into eight second sector-shaped surfaces 81, for a total of sixteen second sector-shaped surfaces 81. After the first excavation area 71 and the second excavation area 72 are all excavated, the third excavation area 73 is excavated from the central island circular hole surface 6 to the upper side of the second excavation area 72. The third excavation area 73 located on the upper semicircle side of the central island circular hole surface 6 is still excavated first, and then the remaining seven third excavation areas 73 are excavated in sequence in a counterclockwise direction.

[0031] like Figure 1 As shown, the second gradient section 5 and the first gradient section 3 are symmetrical about the center of the cylindrical section 4 .

[0032] like Figure 8 As shown, a plurality of gradual section footage surfaces 9 are provided between the excavation starting end 1 and the maximum diameter surface 8. The gradual section footage surfaces 9 are parallel to the maximum diameter surface 8 and the distances between two adjacent gradual section footage surfaces 9 are equal.

[0033] The distance between two adjacent gradual section footage surfaces 9 is 3~5m.

[0034] In this embodiment, the first excavation area 71, the second excavation area 72, and the third excavation area 73 set from the excavation starting end 1 to the maximum diameter surface 8 of the first gradient section 3 are all excavated with equal advances. Starting from the excavation starting end 1, if the excavation advance toward the maximum diameter surface 8 is set to 3m each time, then the eight first excavation areas 71 are excavated in sequence in a counterclockwise direction to a depth of 3m. If the actual depth of the first excavation area 71 is 6m, two advances are required; the second excavation area 72 and the third excavation area 73 are excavated in the same way.

[0035] like Figure 9 As shown, an inner circular excavation area is provided at the center of the cylindrical section 4, and an outer circular excavation area is provided outside the inner circular excavation area. The diameter of the outer circular excavation area is equal to the diameter of the maximum diameter surface 8, and the diameter of the inner circular excavation area is 0.4 to 0.5 times the diameter of the outer circular excavation area. The inner circular excavation area includes a fourth excavation area 74 and a fifth excavation area 75 equally divided from top to bottom, and the outer circular excavation area includes a sixth excavation area 76 and a seventh excavation area 77 equally divided from top to bottom.

[0036] In this embodiment, the fourth excavation area 74 is located above the fifth excavation area 75 , and the sixth excavation area 76 is located above the seventh excavation area 77 .

[0037] like Figure 10As shown, a plurality of stepped cylindrical segment footage surfaces 10 are provided in the cylindrical segment 4, and the cylindrical segment footage surfaces 10 include a fourth excavation area footage surface 101, a fifth excavation area footage surface 102, a sixth excavation area footage surface 103, and a seventh excavation area footage surface 104. The distances between the seventh excavation area footage surface 104, the fifth excavation area footage surface 102, the sixth excavation area footage surface 103, and the fourth excavation area footage surface 101 and the excavation starting end 1 gradually increase. The distance between the seventh excavation area footage surface 104 and the fourth excavation area footage surface 101 is 30-50 m, the distance between the fifth excavation area footage surface 102 and the fourth excavation area footage surface 101 is 24-40 m, and the distance between the sixth excavation area 103 and the fourth excavation area footage surface 101 is 12-20 m. The distances between two adjacent cylindrical segment footage surfaces 10 are equal.

[0038] The distance between the footage surfaces 10 of two adjacent cylindrical segments is 6 to 10 m.

[0039] In this embodiment, the cylindrical section 4 has a maximum diameter surface 8 which is excavated in the direction of the second gradient section 5. Excavation is carried out in the order of the fourth excavation area 74, the fifth excavation area 75, the sixth excavation area 76, and the seventh excavation area 77. After the cylindrical section footage surface 10 is excavated, excavation is continued in the above order. The excavation depth (excavation footage) of each excavation, i.e., the distance between two adjacent cylindrical section footage surfaces 10, is 6 to 10 m.

[0040] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the partitioned excavation structure of an underground high-pressure gas storage reservoir of the present invention, and can produce the positive effects recorded in the present invention.

[0041] It should be noted that the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," "right," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this utility model. They do not indicate or imply that the mechanisms or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on this utility model. The terms "first" and "second" are used solely for brevity of description and do not indicate or imply relative importance.

[0043] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and effect variations to the disclosed embodiments by studying the drawings, the disclosure, and the appended claims. Furthermore, in the claims and the specification, words such as "comprising" and "including" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made based on the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A partitioned excavation structure for an underground high-pressure gas storage reservoir, characterized in that: The invention comprises an excavation start end (1) and an excavation end end (2), wherein a first gradient section (3), a cylindrical section (4) and a second gradient section (5) are sequentially connected between the excavation start end (1) and the excavation end end (2), wherein any radial cross-section of the first gradient section (3), the cylindrical section (4) and the second gradient section (5) is circular, a central island circular hole surface (6) is provided in the first gradient section (3), a maximum diameter surface (8) is provided at the intersection of the first gradient section (3) and the cylindrical section (4), the diameter of the central island circular hole surface (6) is 0.4 to 0.5 times the diameter of the maximum diameter surface (8), and the central island circular hole surface (6) comprises a plurality of equally divided and Concentric first fan-shaped surfaces (61), a first excavation area (71) is provided between each of the first fan-shaped surfaces (61) and the excavation starting end (1), a second excavation area (72) is provided between each of the first fan-shaped surfaces (61) and the maximum diameter surface (8), the maximum diameter surface (8) includes a plurality of equally divided and concentric second fan-shaped surfaces (81), the number of the second fan-shaped surfaces (81) is twice the number of the first fan-shaped surfaces (61), a third excavation area (73) is provided between each of the second fan-shaped surfaces (81) and the center island circular hole surface (6), and the second gradient section (5) and the first gradient section (3) are symmetrical about the center of the cylindrical section (4).

2. The partitioned excavation structure of an underground high-pressure gas storage reservoir according to claim 1, characterized in that: An inner circular excavation area is provided at the center of the cylindrical section (4), and an outer circular excavation area is provided outside the inner circular excavation area. The diameter of the outer circular excavation area is equal to the diameter of the maximum diameter surface (8), and the diameter of the inner circular excavation area is 0.4 to 0.5 times the diameter of the outer circular excavation area. The inner circular excavation area includes a fourth excavation area (74) and a fifth excavation area (75) which are equally divided from top to bottom, and the outer circular excavation area includes a sixth excavation area (76) and a seventh excavation area (77) which are equally divided from top to bottom.

3. The partitioned excavation structure of an underground high-pressure gas storage reservoir according to claim 1, characterized in that: A plurality of gradual section footage surfaces (9) are provided between the excavation start end (1) and the maximum diameter surface (8), the gradual section footage surfaces (9) are parallel to the maximum diameter surface (8), and the distance between two adjacent gradual section footage surfaces (9) is equal.

4. The partitioned excavation structure of an underground high-pressure gas storage reservoir according to claim 1, characterized in that: The cylindrical section (4) is provided with a plurality of stepped cylindrical section footage surfaces (10), the cylindrical section footage surfaces (10) comprising a fourth excavation area footage surface (101), a fifth excavation area footage surface (102), a sixth excavation area footage surface (103), and a seventh excavation area footage surface (104), wherein the seventh excavation area footage surface (104), the fifth excavation area footage surface (102), the sixth excavation area footage surface (103), the fourth excavation area footage surface (101) and the excavation start point are The distance between the ends (1) gradually increases, the distance between the seventh excavation area footage surface (104) and the fourth excavation area footage surface (101) is 30-50 m, the distance between the fifth excavation area footage surface (102) and the fourth excavation area footage surface (101) is 24-40 m, the distance between the sixth excavation area footage surface (103) and the fourth excavation area footage surface (101) is 12-20 m, and the distance between two adjacent cylindrical segment footage surfaces (10) is equal.

5. The partitioned excavation structure of an underground high-pressure gas storage reservoir according to claim 3, characterized in that: The distance between two adjacent gradual-change section footage surfaces (9) is 3-5 m.

6. The partitioned excavation structure of an underground high-pressure gas storage reservoir according to claim 4, characterized in that: The distance between two adjacent cylindrical segment footage surfaces (10) is 6 to 10 m.

Images