Excavation method for gas storage with axial upper part and vertical lower part for layering

Abstract

The invention provides a method for excavating a gas storage with an axial upper part and a vertical lower part, which comprises the following steps of: 1, excavating a contour line of the gas storage, forming a tunnel face in the contour line of the gas storage, and drilling a plurality of peripheral holes along the contour line of the gas storage to form a continuous channel; 2, the upper portion of the gas storage is excavated, a plurality of splitting holes are drilled in the tunnel face of the upper portion of the gas storage at certain intervals in the horizontal direction, and then splitting rock mass excavation is conducted on the free face of the upper portion of the gas storage from the channel to the interior of the gas storage; and 3, the lower portion of the gas storage is excavated, the lower portion of the gas storage is vertically cut, and excavation is conducted from the uppermost layer to the lowermost layer of the lower portion of the gas storage layer by layer. The upper-part and lower-part layered construction is adopted, the design is reasonable, and construction is easy and convenient. Block construction is conducted on the upper portion and the lower portion of the gas storage, disturbance to a rock stratum is reduced, the construction layer is clear, construction is easy, the manufacturing cost is low, efficiency is high, quarry stone can be reserved to the maximum extent, the utilization rate of the quarry stone is increased, and capital recovery is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of underground energy storage, and in particular to a method for excavating an upper axial lower vertical layered gas storage reservoir. Background Art

[0002] The drilling and blasting method is often used for chamber excavation due to its strong adaptability and relatively low cost. However, the disadvantages of the drilling and blasting method are that the construction speed per unit working face is slow, the excavation length is limited, the working environment is poor, the labor intensity is high, the safety is low, and there is a large disturbance to the integrity and air tightness of the rock formation. Therefore, for projects with high requirements for blasting vibration, rock formation integrity, and gas storage air tightness, drilling and blasting construction is difficult to meet the engineering needs, and non-blasting excavation construction technology is required.

[0003] Among the existing non-explosive construction technologies, the shield method and the tunnel boring machine mining method can meet the requirements of non-explosive construction. When the shield method is used, the shield machine needs to carry out construction measurement, site layout, mechanical installation and other construction technology in advance. The system engineering coordination is complex. When the tunnel curve radius is too small or the tunnel is shallow, the construction is difficult. The shield machine has a long manufacturing cycle and is expensive. The assembly and transfer of the shield machine are complicated, and the economic efficiency of short-distance tunnel excavation is poor. The tunnel boring machine method is generally suitable for softer surrounding rocks. When the rock hardness of the tunnel mining is large, the drill bit wears more severely, and there will be insufficient propulsion power, which will extend the construction period and increase the construction cost. It is difficult to meet the excavation requirements of large-scale compressed air energy storage.

[0004] Therefore, a method for excavating a gas storage reservoir with upper axial and lower vertical divisions is needed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for excavating a gas storage reservoir with upper axial and lower vertical divisions in layers, which meets the high air tightness requirements of compressed air storage reservoir excavation, improves the non-explosive excavation construction efficiency of hard rock gas storage reservoirs, saves costs, and increases the utilization rate of rough materials.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for excavating a gas storage reservoir with upper axial and lower vertical divisions, comprising the following steps:

[0008] Step 1: excavate the contour line of the gas storage reservoir, the contour line of the gas storage reservoir is the tunnel face, and a number of peripheral holes are drilled along the contour line of the gas storage reservoir to form a continuous channel, thereby providing an open surface for excavating the upper part and the lower part of the gas storage reservoir;

[0009] Step 2, excavating the upper part of the gas storage reservoir, drilling a number of splitting holes in the horizontal direction at a certain interval on the upper face of the gas storage reservoir, and then splitting and excavating the rock mass from the channel to the inside of the gas storage reservoir on the free face of the upper part of the gas storage reservoir;

[0010] Step 3, excavating the lower part of the gas storage reservoir. The lower part of the gas storage reservoir is cut vertically, and excavated layer by layer from the uppermost layer to the lowermost layer of the gas storage reservoir.

[0011] Furthermore, in the above-mentioned upper axial and lower vertical divided layered gas storage excavation method, in step 1, a horizontal dividing line is set on the tunnel face, the tunnel face above the horizontal dividing line is the inferior arc surface, and the space of the gas storage corresponding to the inferior arc surface is the upper part of the gas storage, and the tunnel face below the horizontal dividing line is the superior arc surface, and the space of the gas storage corresponding to the superior arc surface is the lower part of the gas storage.

[0012] Furthermore, in the above-mentioned upper axial and lower vertical divided layered gas storage excavation method, in step 1, a water-mill drilling rig is used to drill holes along the contour line of the gas storage with corresponding borehole external insertion angles, and adjacent bore holes are nested with each other to form peripheral holes that are cut by adjacent bore holes, forming a continuous groove on the contour line of the gas storage, separating the heading face from the surrounding environment of the tunnel, and forming an open face for excavating the upper and lower parts of the gas storage.

[0013] Furthermore, in the above-mentioned upper axial and lower vertical divided layered gas storage excavation method, in step 2, a water-mill drilling rig is used to construct multiple rows of splitting holes in an array on the upper face of the gas storage, and multiple splitting holes are constructed in each row; the axis of the splitting holes is perpendicular to the face; the multiple splitting holes in the same row are symmetrically arranged relative to the vertical axis of the face, the multiple splitting holes in the same row are evenly and equidistantly distributed, the axes of the multiple splitting holes in the same row are located in the same plane, and the hole spacing of the splitting holes in the same row is less than the minimum resistance line W; the axes of the splitting holes in the same column are located in the same vertical section, and the hole spacing of the splitting holes in the same column is less than the minimum resistance line W; the value of the minimum resistance line W is 190 mm; the drilling depth of the splitting holes is equal to that of the surrounding holes, and the footage of one operating cycle of the splitting holes is equal to that of one operating cycle of the surrounding holes.

[0014] Furthermore, in the above-mentioned upper axial and lower vertically divided layered gas storage excavation method, in step 2, a number of excavation blocks are formed between four adjacent splitting holes and between the splitting holes and adjacent peripheral holes; when splitting and excavating the rock mass on the upper part of the gas storage reservoir, the rock mass corresponding to the top row of excavation blocks is excavated first; then the rock mass corresponding to the second row of excavation blocks is excavated; until the rock mass corresponding to the bottom row of excavation blocks is excavated, the excavation of the upper part of the gas storage reservoir is completed; when excavating the rock mass corresponding to each row of excavation blocks, the rock mass corresponding to each excavation block is excavated in sequence from the peripheral holes to the middle of the face.

[0015] Furthermore, in the above-mentioned upper axial and lower vertical layered gas storage excavation method, when excavating each excavation block on the upper part of the gas storage, the splitting rod of the hydraulic splitter is first inserted into the splitting hole, and the splitting direction of the splitting rod is kept perpendicular to the face, and then the splitter is started to gradually apply splitting force to the splitting hole. As the splitting force gradually increases, the splitting hole cracks along the splitting surface direction, and the length of the crack will continue to increase, and the width of the crack will continue to widen. When the crack is connected with the free surface, a splitting surface is formed. After that, the crack width of the splitting surface will continue to widen, and the crack length will also be lengthened due to the extension of the crack to both ends, until the entire excavated block of rock is split and divided.

[0016] Furthermore, in the above-mentioned upper axial lower vertical divided layered gas storage excavation method, in the step 3, firstly, a plurality of transverse positioning lines and a plurality of vertical positioning lines are set on the primary arc surface, and the plurality of transverse positioning lines and the plurality of vertical positioning lines divide the primary arc surface into a plurality of layers of excavation blocks, each layer having a plurality of excavation blocks; the excavation blocks of the same layer are symmetrically arranged about the vertical axis of the face.

[0017] Furthermore, in the above-mentioned upper axial lower vertically divided layered gas storage excavation method, in the step 3, when excavating the lower part of the gas storage, on the basis of the free surface formed by excavating the upper part of the gas storage, cutting and quarrying are carried out along the vertical positioning line and the horizontal positioning line, and excavation is carried out layer by layer from the uppermost excavation block of the lower part of the gas storage to the lowermost layer; during construction, the uppermost excavation block of the lower part of the gas storage is cut first, and the excavation blocks from the peripheral holes to the middle of the face are cut in sequence to form various rock blocks, and then the excavation blocks of the second layer from the upper part of the lower part of the gas storage are cut, and the excavation blocks from the peripheral holes to the middle of the face are cut in sequence to form various rock blocks, until the excavation blocks of the lowest layer of the lower part of the gas storage are cut, and the excavation blocks from the peripheral holes to the middle of the face are cut in sequence to form various rock blocks.

[0018] Furthermore, in the above-mentioned upper axial and lower vertically divided layered gas storage excavation method, in step 3, when excavating each excavation block in the lower part of the gas storage, firstly, a cutting machine is used to perform vertical cutting on both sides of the excavation block along the vertical positioning line. After the cutting machine reaches the corresponding cutting depth, a back cutter is used to cut the excavation block parallel to the face. When the corresponding positioning line is reached, a diamond beaded wire saw is used to cut the bottom surface of the excavation block along the horizontal positioning line. As the cutting depth continues to increase, the entire rock mass is separated out.

[0019] Furthermore, in the above-mentioned upper axial and lower vertical divided layered gas storage excavation method, after completing the excavation of each excavation block, a hydraulic impact hammer or a diamond wire saw trimmer is used to trim the under-excavated part until the excavation requirements of the contour line are met before the next rock block is divided.

[0020] It can be seen from the analysis that the present invention discloses a method for excavating a gas storage reservoir with upper axial and lower vertical divisions in layers, which adopts the method of first upper and then lower layered construction, with reasonable design and simple construction. By constructing the gas storage reservoir in blocks, the disturbance to the rock formation is reduced, the construction layers are clear, the construction is simple, the cost is low, and the efficiency is high. The rough materials can be retained to the maximum extent, the utilization rate of rough materials can be improved, and the capital recovery can be accelerated. The conventional gas storage excavation solves the problems of low safety, poor rock formation integrity, poor air tightness, and complex and expensive construction equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0022] Figure 1 The figure is a flow chart of a gas storage excavation method according to an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of a construction method according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the construction sequence of excavating the upper part of a gas storage reservoir according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the construction sequence of excavating the lower part of a gas storage reservoir according to an embodiment of the present invention.

[0026] Explanation of the accompanying reference numerals: 1 contour line; 2 peripheral holes; 3 splitting holes; 4, 5, 6, 7, ..., 39 construction sequence numbers of the excavation blocks at the upper part of the gas storage reservoir; 40, 41, 42, 43, ..., 114 construction sequence numbers of the excavation blocks at the lower part of the gas storage reservoir; 115 inferior arc surface; 116 superior arc surface; 117 horizontal positioning line; 118 vertical positioning line; 119 horizontal dividing line. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0028] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numbers and letter labels to refer to features in the drawings. Like or similar labels in the drawings and description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first", "second", "third", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0030] like Figures 1 to 4 As shown, according to an embodiment of the present invention, a method for excavating a gas storage reservoir with upper axial and lower vertical layers is provided. Figure 1 As shown, the mining method includes the following steps:

[0031] Step 1, excavating the contour line 1 of the gas storage reservoir, the contour line 1 of the gas storage reservoir is the tunnel face, and a number of peripheral holes 2 are drilled along the contour line 1 of the gas storage reservoir to form a continuous groove, thereby providing an open surface for excavating the upper part and the lower part of the gas storage reservoir.

[0032] like Figure 2 As shown, a horizontal dividing line 119 is set on the tunnel face, the tunnel face above the horizontal dividing line 119 is the inferior arc surface 115, and the space of the gas storage corresponding to the inferior arc surface 115 is the upper part of the gas storage, and the tunnel face below the horizontal dividing line 119 is the major arc surface 116, and the space of the gas storage corresponding to the major arc surface 116 is the lower part of the gas storage.

[0033] A water-grinding drill is used to drill holes along the contour line 1 of the gas storage reservoir at corresponding borehole external insertion angles. Adjacent bore holes are nested with each other to form peripheral holes 2 that cut each other. Several peripheral holes 2 form a continuous groove on the contour line 1 of the gas storage reservoir, separating the heading face from the surrounding environment of the tunnel, forming an excavation contour, and forming an open surface for excavating the upper and lower parts of the gas storage reservoir.

[0034] Step 2, excavate the upper part of the gas storage reservoir, drill a number of splitting holes 3 at a certain interval in the horizontal direction on the upper face of the gas storage reservoir, and then split and excavate the rock mass from the groove to the inside of the gas storage reservoir on the free face of the upper part of the gas storage reservoir.

[0035] A multi-head water-grinding drill is used to construct multiple rows of splitting holes 3 in an array on the upper face of the gas storage reservoir, with multiple splitting holes 3 constructed in each row; the axis of the splitting holes 3 is perpendicular to the face; the multiple splitting holes 3 in the same row are symmetrically arranged relative to the vertical axis of the face, the multiple splitting holes 3 in the same row are evenly and equidistantly distributed, the axes of the multiple splitting holes 3 in the same row are parallel to each other and located in the same plane, and the hole spacing of the splitting holes 3 in the same row is smaller than the minimum resistance line W, so as to ensure that the rock mass above the gas storage reservoir can be split and excavated; the axes of the splitting holes 3 in the same row are located in the same vertical section, and the hole spacing of the splitting holes 3 in the same row is smaller than the minimum resistance line W, so as to ensure that the rock mass above the gas storage reservoir can be split and excavated; the value of the minimum resistance line W is 190mm; the drilling depth of the splitting holes 3 is equal to that of the peripheral holes 2, and the footage of one operating cycle of the splitting holes 3 is equal to that of one operating cycle of the peripheral holes 2.

[0036] Several excavation blocks are formed between four adjacent splitting holes 3 and between the splitting holes 3 and the adjacent peripheral holes 2. The splitting holes 3 and the peripheral holes 2 form splitting planes, and the several splitting planes split the tunnel face into several excavation blocks, for example: Figure 3As shown, the excavation blocks on the upper part of the gas storage are numbered 4...6, 7...11, 12...17, 18...24, 25...31, 32...39. When splitting and excavating the rock mass on the upper part of the gas storage reservoir, excavation construction is carried out in the order of first the upper part and then the lower part, and first the periphery and then the middle (the excavation blocks are numbered 4, 5, 6, ..., 39 in sequence). First, the rock mass corresponding to the top row of excavation blocks is excavated (the excavation blocks from the continuous groove to the vertical axis of the tunnel face are numbered 4, 5, 6 in sequence, the top row of excavation blocks on the upper part of the gas storage reservoir located on both sides close to the continuous groove are numbered 4, the two excavation blocks close to the vertical axis of the tunnel face are numbered 6, and the numbering of the excavation blocks in other rows is similar); then the rock mass corresponding to the second row of excavation blocks from the top is excavated (the excavation blocks are numbered 7, 8, 9, 10, 11 in sequence); until the rock mass corresponding to the bottom row of excavation blocks is excavated (the excavation blocks are numbered 32, 33, 34, 35, 36, 37, 38, 39 in sequence), the excavation of the upper part of the gas storage reservoir is completed. When excavating the rock mass corresponding to each row of excavation blocks, start from the free surface formed by the continuous grooves on the contour line 1, and excavate the rock mass corresponding to each excavation block in sequence from the peripheral holes 2 to the middle of the tunnel face.

[0037] When excavating each excavation block on the upper part of the gas storage reservoir, first insert the splitting rod of the hydraulic splitter into the splitting hole 3, and keep the splitting direction of the splitting rod perpendicular to the heading face, then start the splitter, and gradually apply the splitting force to the splitting hole 3. As the splitting force gradually increases, the splitting hole 3 cracks along the splitting surface direction, and the length of the crack will continue to increase, and the width of the crack will continue to widen. When the crack is connected with the free surface, a splitting surface is formed. After that, the crack width of the splitting surface will continue to widen, and the crack length will also be lengthened due to the extension of the crack to both ends, until the entire excavated block of rock is split and divided.

[0038] The upper part of the gas storage reservoir is constructed in blocks, and the free surface formed by the peripheral holes 2 and the splitting holes 3 is used to achieve the purpose of crushing the rock mass, while also reducing the disturbance to the rock formation.

[0039] Step 3, excavating the lower part of the gas storage reservoir. The lower part of the gas storage reservoir is cut vertically using a combination of 4-9 circular saw cutting machines and 4 diamond beaded wire saws. The lower part of the gas storage reservoir is excavated layer by layer from the uppermost layer to the lowermost layer.

[0040] First, a plurality of transverse positioning lines 117 and a plurality of vertical positioning lines 118 are set on the major arc surface 116. The plurality of transverse positioning lines 117 and the plurality of vertical positioning lines 118 divide the major arc surface 116 into a plurality of layers of excavation blocks, each layer having a plurality of excavation blocks; the excavation blocks of the same layer are symmetrically arranged about the vertical axis of the tunnel face.

[0041] When excavating the lower part of the gas storage reservoir, based on the free surface formed by excavating the upper part of the gas storage reservoir, cutting and quarrying are carried out along the vertical positioning line 118 and the horizontal positioning line 117, and the excavation order is from top to bottom, from the sides to the middle, from the top layer of the lower part of the gas storage reservoir to the bottom layer by layer, so as to retain the rough materials to the greatest extent.

[0042] During construction, the top excavation blocks at the bottom of the gas storage reservoir are cut first, and the excavation blocks from the peripheral hole 2 to the middle of the tunnel face are cut in sequence to form various rock blocks. Then, the second top excavation blocks at the bottom of the gas storage reservoir are cut, and the excavation blocks from the peripheral hole 2 to the middle of the tunnel face are cut in sequence to form various rock blocks, until the bottom excavation blocks at the bottom of the gas storage reservoir are cut, and the excavation blocks from the peripheral hole 2 to the middle of the tunnel face are cut in sequence to form various rock blocks. For example: Figure 4 As shown, the excavation blocks at the bottom of the gas storage are numbered 40...47, 48...55, 56...63, 64...71, 72...79, 80...87, 88...95, 96...102, 103...108, 109...113, 114...116 (the excavation blocks at the top layer of the lower part of the gas storage are located on both sides of the excavation blocks close to the continuous grooves, and the two excavation blocks close to the vertical axis of the face are both numbered 40, and the order of the numbering of the excavation blocks at other layers is similar). First, the excavation blocks around the lower part are cut into blocks to remove stones (the excavation blocks are numbered 40). Secondly, the face is vertically cut into blocks along the vertical positioning line 118. Finally, the lower part of the gas storage is excavated in the order of cutting and excavation (40, 41, 42, ..., 116).

[0043] When excavating each excavation block at the bottom of the gas storage reservoir, first use a cutting machine to perform vertical cutting on both sides of the excavation block along the vertical positioning line 118. After the cutting machine reaches the corresponding cutting depth, use a back cutter to cut the excavation block parallel to the face. When the corresponding horizontal positioning line 117 is reached, a diamond beaded wire saw is used to cut the bottom surface of the excavation block along the horizontal positioning line 117. As the cutting depth continues to increase, the entire rock block is separated. In one embodiment of the present invention, the specifications of the cut rock block are 1.5m×1.5m×1m. In other embodiments of the present invention, the size of the rock block can be adjusted according to actual conditions.

[0044] After completing the excavation of each excavation block, a hydraulic impact hammer or a diamond wire saw trimmer is used to trim the under-excavated part (correction of the rounded corners of the gas storage reservoir) until the excavation requirements of contour line 1 are met before the next rock block is divided.

[0045] The lower part of the gas storage reservoir is constructed in blocks, using vertical cutting quarrying and block cutting. At the same time, the rounded edges of the gas storage reservoir are corrected. The construction has clear layers, simple construction, low cost and high efficiency. It can retain the rough materials to the maximum extent, improve the utilization rate of the rough materials and accelerate capital recovery.

[0046] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0047] (1) The gas storage reservoir excavation method adopts the method of layered construction from top to bottom, which is reasonable in design and easy to construct.

[0048] (2) By constructing the gas storage facility in blocks, the disturbance to the rock strata can be reduced. The construction layers are clear, the construction is simple, the cost is low, and the efficiency is high. The rough materials can be retained to the maximum extent, the utilization rate of the rough materials can be improved, and the capital recovery can be accelerated.

[0049] (3) It solves the problems of low safety, poor rock integrity, poor air tightness, and complex and expensive construction equipment brought about by conventional gas storage excavation.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for excavating a gas storage reservoir with upper axial and lower vertical divisions, characterized in that: The following steps are included: Step 1: excavate the contour line of the gas storage reservoir, the contour line of the gas storage reservoir is the tunnel face, and a number of peripheral holes are drilled along the contour line of the gas storage reservoir to form a continuous channel, thereby providing an open surface for excavating the upper part and the lower part of the gas storage reservoir; Step 2, excavating the upper part of the gas storage reservoir, drilling a number of splitting holes in the horizontal direction at a certain interval on the upper face of the gas storage reservoir, and then splitting and excavating the rock mass from the channel to the inside of the gas storage reservoir on the free face of the upper part of the gas storage reservoir; Step 3, excavating the lower part of the gas storage reservoir. The lower part of the gas storage reservoir is cut vertically, and excavated layer by layer from the uppermost layer to the lowermost layer of the gas storage reservoir.

2. The upper axial lower vertical stratified gas storage excavation method according to claim 1 is characterized in that: In step 1, a horizontal dividing line is set on the tunnel face, the tunnel face above the horizontal dividing line is the inferior arc surface, and the space of the gas storage corresponding to the inferior arc surface is the upper part of the gas storage, and the tunnel face below the horizontal dividing line is the superior arc surface, and the space of the gas storage corresponding to the superior arc surface is the lower part of the gas storage.

3. The upper axial lower vertical stratified gas storage excavation method according to claim 1 is characterized in that: In step 1, a water-grinding drill is used to drill holes along the contour line of the gas storage reservoir at corresponding borehole external insertion angles. Adjacent boreholes are nested with each other to form peripheral holes that are cut by adjacent boreholes. A continuous groove is formed on the contour line of the gas storage reservoir, so that the heading face is separated from the surrounding environment of the tunnel, and an open face is formed for excavating the upper and lower parts of the gas storage reservoir.

4. The upper axial lower vertical stratified gas storage excavation method according to claim 1 is characterized in that: In step 2, a water-mill drill is used to construct multiple rows of splitting holes in an array on the upper face of the gas storage reservoir, with multiple splitting holes constructed in each row; The axis of the splitting hole is perpendicular to the tunnel face; The multiple splitting holes in the same row are symmetrically arranged relative to the vertical axis of the tunnel face, the multiple splitting holes in the same row are evenly and equidistantly distributed, the axes of the multiple splitting holes in the same row are located in the same plane, and the hole spacing of the splitting holes in the same row is less than the minimum resistance line W; The axes of the split holes in the same row are located in the same vertical section, and the hole spacing of the split holes in the same row is smaller than the minimum resistance line W; The value of the minimum resistance line W is 190 mm; The drilling depths of the splitting hole and the peripheral holes are equal, and the drilling footage of one operation cycle of the splitting hole is equal to the drilling footage of one operation cycle of the peripheral holes.

5. The upper axial lower vertical stratified gas storage excavation method according to claim 4 is characterized in that: In step 2, a plurality of excavation blocks are formed between four adjacent splitting holes and between a splitting hole and adjacent peripheral holes; When splitting and excavating the rock mass on the upper part of the gas storage reservoir, the rock mass corresponding to the excavation blocks in the top row is excavated first; Then dig the rock mass corresponding to the second row of digging blocks from the top; Until the rock mass corresponding to the bottom row of excavation blocks is excavated, the excavation of the upper part of the gas storage reservoir is completed; When excavating the rock mass corresponding to each row of excavation blocks, the rock mass corresponding to each excavation block is excavated in sequence from the peripheral holes to the middle of the tunnel face.

6. The upper axial lower vertical stratified gas storage excavation method according to claim 5 is characterized in that: When excavating each block on the upper part of the gas storage reservoir, first insert the splitting rod of the hydraulic splitter into the splitting hole, and keep the splitting direction of the splitting rod perpendicular to the tunnel face, then start the splitting machine, and gradually apply splitting force to the splitting hole. As the splitting force gradually increases, the splitting hole cracks along the splitting surface direction, and the length of the crack will continue to increase, and the width of the crack will continue to widen. When the crack is connected with the air surface, a splitting surface is formed. Afterwards, the crack width of the splitting surface will continue to widen, and the crack length will also increase as the crack extends to both ends, until the entire excavated rock mass is split and divided.

7. The upper axial lower vertical stratified gas storage excavation method according to claim 1 is characterized in that: In the step 3, firstly, a plurality of transverse positioning lines and a plurality of vertical positioning lines are set on the major arc surface, and the plurality of transverse positioning lines and the plurality of vertical positioning lines divide the major arc surface into a plurality of layers of excavation blocks, and each layer has a plurality of excavation blocks; The excavation blocks of the same layer are arranged symmetrically along the vertical axis of the tunnel face.

8. The upper axial lower vertical stratified gas storage excavation method according to claim 7 is characterized in that: In step 3, when excavating the lower part of the gas storage reservoir, on the basis of the free surface formed by excavating the upper part of the gas storage reservoir, cutting and quarrying are carried out along the vertical positioning line and the horizontal positioning line, and excavation is carried out layer by layer from the uppermost layer of the lower part of the gas storage reservoir to the lowermost layer; During construction, the top excavation blocks at the bottom of the gas storage are cut first, and then the excavation blocks from the peripheral holes to the middle of the tunnel face are cut in sequence to form various rock blocks. Then cut the second layer of excavation blocks from the lower part of the gas storage reservoir, and cut and excavate blocks from the peripheral holes to the middle of the tunnel face to form various rock blocks. Until the lowest layer of excavation blocks at the bottom of the gas storage reservoir is cut, the excavation blocks from the peripheral holes to the middle of the face are cut in sequence to form various rock blocks.

9. The upper axial lower vertical stratified gas storage excavation method according to claim 7 is characterized in that: In step 3, when excavating each excavation block at the bottom of the gas storage reservoir, first use a cutting machine to perform vertical cutting on both sides of the excavation block along the vertical positioning line. After the cutting machine reaches the corresponding cutting depth, use a back cutter to cut the excavation block parallel to the face. When the corresponding positioning line is reached, use a diamond beaded wire saw to cut the bottom surface of the excavation block along the horizontal positioning line. As the cutting depth continues to increase, the entire rock block is separated.

10. The upper axial lower vertical stratified gas storage excavation method according to claim 9 is characterized in that: After completing the excavation of each excavation block, use a hydraulic impact hammer or diamond wire saw trimmer to trim the under-excavated part until the excavation requirements of the contour line are met before dividing the next rock block.

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