Oil storage cavern type section structure, computer program product and oil storage cavern construction method

Abstract

The invention provides an oil storage cavern type section structure, a computer program product and an oil storage cavern construction method.The structure comprises seven arc sections, a bottom plate section, a second arc, a fourth arc, a sixth arc and a third arc, wherein the first arc at the top of a cavern is equally divided by the central axis of a cavern section, and the second arc, the fourth arc and the sixth arc are sequentially connected with one end of the first arc in an end-to-end tangent mode; a third arc, a fifth arc and a seventh arc which are sequentially and tangentially connected with the other end of the first arc end to end are symmetrically distributed along the central axis of the cavern section; the bottom plate section is tangentially connected with the tail ends of the fifth arc and the sixth arc respectively; chords of all the arc sections are located in the cavern; and the length between the second arc tail end and the third arc tail end is the span of the cavern. The structural contour line has no small curvature radius, stress in all directions around the cavern is uniformly distributed, stress concentration generated by sharp corners is avoided, and long-term stability of surrounding rock of the oil storage cavern can be ensured; during construction, disturbance to surrounding rocks is small, stress redistribution is better, and the problem that the stability of the tunnel shape is poor under the condition that the surrounding rocks are poor is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil storage caverns, and particularly relates to an oil storage cavern hole type cross section structure, a computer program product and an oil storage cavern construction method. BACKGROUND

[0002] As an important structure of underground water-sealed caverns, the oil storage cavern needs to meet the oil storage requirement for 50 years, and is in a three-phase working condition of water, oil and gas for a long time. In order to ensure the normal use of the oil storage cavern, the underground engineering structure must be stable for a long time under the action of different geological structures. The traditional oil storage cavern usually adopts a straight wall and round arch type cross section structure, which has a good construction progress index. For example, the structure shown in the Chinese patent "Water-sealed oil cavern grouting and infiltration design method" with the application number "CN202211431086.4". When the underground cavern is excavated, the oil storage cavern with the straight wall and round arch type cross section structure will disturb the original ground stress and change the stress redistribution in the surrounding rock. The cavern with the straight wall and round arch type cross section structure has a right angle, which is easy to cause stress concentration. When the rock mass stress or deformation exceeds a certain amplitude, damage will occur, that is, the rock mass will be unstable. SUMMARY

[0003] Therefore, the purpose of the present application is to provide an oil storage cavern hole type cross section structure, a computer program product and an oil storage cavern construction method, so that the oil storage cavern hole type is smoother and has no abrupt sharp corners, to solve the problem of rock mass instability caused by stress concentration.

[0004] The oil storage cavern hole type cross section structure disclosed by the present application comprises seven circular arc segments and a bottom plate segment. The seven circular arc segments are a first circular arc which divides the cavern top cross section along the middle axis, a second circular arc, a fourth circular arc and a sixth circular arc which are sequentially and circularly connected at one end of the first circular arc, and a third circular arc, a fifth circular arc and a seventh circular arc which are sequentially and circularly connected at the other end of the first circular arc. The first side segment composed of the second circular arc, the fourth circular arc and the sixth circular arc is symmetrically distributed along the middle axis of the cavern cross section with the second side segment composed of the third circular arc, the fifth circular arc and the seventh circular arc. The two ends of the bottom plate segment are respectively connected with the tail ends of the sixth circular arc and the seventh circular arc. The chords of the seven circular arc segments are all inside the cavern. The length between the tail end of the second circular arc and the tail end of the third circular arc is the cavern span B.

[0005] The above-mentioned cave cross-section structure is composed of seven circular arcs and a straight line. Each arc segment is concave into the cave, each connection point is tangent, and the contour line has no sharp angle mutations. Compared with the traditional straight-wall circular arch cave, the cave cross-section structure provided by the present invention is smoother, better at bearing force, has a smaller plastic zone, and has less stress concentration; the top arch above the cave span is composed of three circular arcs, which can further adapt to different stress conditions.

[0006] Furthermore, the cavern span B is 15m-25m, and the cavern height H is 20m-35m. These dimensions for the oil storage caverns are selected based on safety and functionality, taking into account both initial construction costs and subsequent oil inflow and outflow efficiency, to achieve optimal economic efficiency throughout the lifecycle of the oil storage cavern complex.

[0007] Furthermore, the fourth arc's tail end extension and the fifth arc's tail end extension each intersect the cavern floor. The distance between the two intersections is the floor width B2, which is 15-20 meters. Selecting this floor width reduces excavation and support costs per unit volume while still meeting the operating space requirements for excavation, support, and subsequent maintenance of large mechanical equipment such as drilling rigs, shotcrete trucks, and loaders.

[0008] Furthermore, the radius R1 of the first circular arc is 7m-12m, and the central angle α of the first circular arc is 45°-120°. The first circular arc of these dimensions effectively transfers the surrounding rock pressure at the cavern roof to both sides, forming a stable pressure arch, which better utilizes the self-supporting capacity of the surrounding rock and reduces support costs.

[0009] Furthermore, the radius R2 of the second arc is 10m-30m, and the central angle β of the second arc is 30°-67.5°. The second arc, a third arc symmetrical to the second arc, and the first arc together form a large central angle, flattened vault, which better adapts to horizontal compression and transfers loads to the surrounding rock on both sides.

[0010] Furthermore, the radius R3 of the fourth arc is 20m-100m; the central angle γ of the fourth arc is 10°-30°, and the fourth arc located vertically on the side wall and the fifth arc symmetrical thereto adopt a larger radius and a smaller central angle, which makes the vertical side wall close to the vertical line, thereby reducing the vertical load on the side wall of the cavern.

[0011] Furthermore, the radius R4 of the sixth arc is 2m-5m, and the central angle θ of the sixth arc is 60°-80°. The smaller radius and larger central angle of the sixth arc and its symmetrical seventh arc disperse the load across a wider area of ​​the sidewall, reducing lateral pressure on the sidewall.

[0012] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements a method for determining the size parameters of the section structure of the oil storage cavern according to the above-mentioned method, and the method comprises the following steps: S1, according to the size of the section area of the oil storage cavern, the initial values B', H' and B2' of the cavern span, the cavern height and the bottom width are preliminarily determined; S2, the radius R1 and the central angle a are selected, the position of the center O1 on the central axis of the cavern section is determined, and the first circular arc is formed; S3, a ray is formed by connecting the center O1 at the right end point of the first circular arc, the ray is the line of the center O2 of the second circular arc, the radius R2 of the second circular arc is selected according to the fact that the first end of the second circular arc is tangent to the right end point of the first circular arc and the length between the tail end of the second circular arc and the tail end of the third circular arc is the cavern span B', the position of the center O2 of the second circular arc is determined, and the second circular arc is formed; S4, the center O3 of the third circular arc is determined according to the fact that the third circular arc is symmetrical to the second circular arc with the central axis of the cavern section as the axis of symmetry, and the third circular arc is formed; S5, the perpendicular bisector of the line connecting the tail end of the second circular arc and the right end point of the bottom width is drawn, the intersection point of the perpendicular bisector and the straight line on which O2O3 lies is the center O4 of the fourth circular arc, the distance between the center O4 and the tail end of the second circular arc is the radius R3 of the fourth circular arc, and the fourth circular arc intersects the bottom surface; S6, according to the fact that the sixth circular arc is tangent to the right end of the bottom plate segment and the tail end of the fourth circular arc respectively, the radius R4 of the sixth circular arc is selected within the optional range, the center O6 is determined, the sixth circular arc is formed, and the tail end of the fourth circular arc is the tangent intersection point of the sixth circular arc and the fourth circular arc; S7, the fifth circular arc and the seventh circular arc are formed according to the fact that the fifth circular arc and the seventh circular arc are symmetrical to the fourth circular arc and the sixth circular arc with the central axis of the cavern section as the axis of symmetry respectively; the tail ends of the sixth circular arc and the seventh circular arc are connected to form the bottom plate segment; S8, according to the area requirement of the cavern section, the parameters in S1 are fine-tuned, steps S1-S7 are repeated, and the final values B, H and B2 of the cavern span, the cavern height and the bottom width are obtained, and the final section structure of the oil storage cavern is determined.

[0013] The application further provides a construction method of an oil storage cavern, which is constructed according to the above-mentioned section structure of the oil storage cavern, and adopts the drill-and-blast method, and comprises the following steps: The cavern section is divided into five layers from top to bottom, the heights of the first layer, the second layer, the third layer and the fourth layer are all controlled within 7m, and the height of the fifth layer is 2m-3m; The first layer adopts the mode of middle pilot hole excavation first and left and right side hole expansion excavation later, and the mode is in the shape of a product; The second layer adopts the mode of first middle groove excavation first and left and right first side wall expansion excavation following; The third layer adopts the mode of second middle groove excavation in advance and left and right second side wall expansion excavation following up; The fourth layer adopts the mode of third middle groove excavation in advance and left and right third side wall expansion excavation following up; The fifth layer is excavated separately; After the excavation of each area of each layer is completed, supporting is performed according to the construction sequence; Weak blasting and short footage horizontal control blasting are adopted for each layer.

[0014] The construction mode of layered excavation reduces the exposed surface, exposes only a part of the rock body each time, makes the stress of the surrounding rock gradually and step by step released, and makes the deformation more easily monitored and controlled; the first layer of the arc-shaped top is excavated and supported first, a stable "protective shell" of the cavern is formed, and the risk of roof instability caused by too large exposed surface during subsequent lower layer excavation is reduced; supporting is performed after the excavation of each layer is completed, the structural strength of the excavation surface is ensured, the construction surface is stably pushed forward, the bottom plate of the upper layer after the excavation is completed can be used as the operation platform for the lower layer construction, large-scale mechanical equipment can be used for drilling, blasting and supporting operations of the next layer, and the risk of operation under the steep working face is avoided; weak blasting and short footage horizontal control blasting are adopted to reduce the disturbance of blasting to the surrounding rock of the bottom plate, and the effects of controlling water seepage and increasing the blasting forming effect are achieved.

[0015] Further, the two side expansion layers of the second layer, the third layer and the fourth layer adopt a slope release type to improve the stability of the temporary side wall.

[0016] The present application has the following beneficial effects: The contour line of the hole type cross section structure of the oil storage cavern provided by the present application has no small curvature radius, the stress distribution of the hole circumference is uniform, stress concentration caused by sharp corners is avoided, the long-term stability of the surrounding rock of the oil storage cavern is ensured, the disturbance to the surrounding rock during construction is small, stress redistribution is more optimal, the problem of poor stability of the hole type under poor surrounding rock conditions is solved, and the hole type cross section structure is especially suitable for projects in which the rock mass in the reservoir area is mainly grade III and IV and joint fissures develop. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a whole schematic view of the hole type cross section structure of the oil storage cavern provided by some embodiments of the present application, Figure 2 is a schematic view of the hole type cross section structure of the oil storage cavern provided by some embodiments of the present application, Figure 3 is a schematic view of the construction area of the oil storage cavern provided by some embodiments of the present application, Figure 4 is a size diagram of the cross section structure of the oil storage cavern in the embodiments of the present application, and the length unit in the diagram is mm.

[0018] Explanation of reference signs: 1 first arc, 2 second arc, 3 third arc, 4 fourth arc, 5 fifth arc, 6 sixth arc, 7 seventh arc, 8 bottom plate segment, Ⅰ first floor, Ⅰ1 middle guide tunnel, Ⅰ2 side tunnel, Ⅱ second floor, Ⅱ1 first middle slot, Ⅱ2 first side wall, Ⅲ third floor, Ⅲ1 second middle slot, Ⅲ2 second side wall, Ⅳ fourth floor, Ⅳ1 third middle slot, Ⅳ2 third side wall, Ⅴ fifth floor. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. The terms "left", "right" and similar expressions are for illustrative purposes only and are not intended to be the only embodiment. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains.

[0020] like Figure 1 As shown, the present invention provides a cavern-shaped cross-sectional structure of an oil storage cavern, which includes seven arc segments and a bottom plate segment 8; the seven arc segments are a first arc 1 at the top of the cavern bisected by the central axis of the cavern cross-section, a second arc 2, a fourth arc 4 and a sixth arc 6 connected end-to-end tangently to the right end of the first arc 1, and a third arc 3, a fifth arc 5 and a seventh arc 7 connected end-to-end tangently to the left end of the first arc 1; the right side segment composed of the second arc 2, the fourth arc 4 and the sixth arc 6 and the left side segment composed of the third arc 3, the fifth arc 5 and the seventh arc 7 are symmetrically distributed along the central axis of the cavern cross-section; the two ends of the bottom plate segment 8 are tangently connected to the tail ends of the sixth arc 6 and the seventh arc 7 respectively; the chords of the seven arc segments are all located inside the cavern; the length between the tail end of the second arc 2 and the tail end of the third arc 3 is the cavern span B.

[0021] To achieve optimal economic efficiency throughout the lifecycle of the oil storage cavern complex, the following cavern dimensions can be selected based on storage capacity, construction requirements, and a comprehensive consideration of initial construction costs and subsequent cavern oil inlet and outlet efficiency: cavern span B is 15m-25m, and cavern height H is 20m-35m. The extensions of the fourth arc 4 and the fifth arc 5 intersect the cavern floor, with the distance between the two intersections being the bottom width B2, which is 15-20m. The radius R1 of the first arc 1 is 7m-12m; the central angle α of the first arc 1 is 45°-120°. The radius R2 of the second arc 2 is 10m-30m; the central angle β of the second arc 2 is 30°-67.5°. The radius R3 of the fourth arc 4 is 20m-100m; the central angle γ of the fourth arc 4 is 10°-30°. The radius R4 of the sixth arc 6 is 2 m-5 m; the central angle θ of the sixth arc 6 is 60°-80°.

[0022] The present invention also provides a method for determining the cross-sectional structural parameters of an oil storage cavern, which is used to determine the cross-sectional structure of the oil storage cavern.

[0023] This method includes the following steps: Preliminary values ​​for the cavern span, height, and bottom width (B', H', and B2') are determined based on the cross-sectional area of ​​the oil storage cavern. The initial values ​​for the cavern span (B') and height (H') can be roughly determined based on the span and height of existing straight-wall, round-arch structures of the same area. Existing oil storage caverns typically have a greater height than their span, and their span-to-height ratio (B / H) is primarily determined by geological conditions and cavern group stability, with empirical values ​​typically ranging between 0.6 and 0.9. The initial values ​​for the cavern span (B') and height (H') can be slightly larger than the span and height of straight-wall, round-arch structures, respectively. The initial bottom width (B2') is smaller than the initial cavern span (B').

[0024] like Figure 2 As shown, the radius R1 and the central angle α are selected, the center O1 is located on the central axis of the cavern section, and the first arc 1 is formed.

[0025] A ray is formed by connecting the center O1 along the right end point of the first arc 1. The ray is the line where the center O2 of the second arc 2 is located. According to the fact that the beginning of the second arc 2 is tangent to the right end point of the first arc 1 and the length between the tail end of the second arc 2 and the tail end of the third arc 3 is the cavern span B', the radius R2 of the second arc 2 is selected, the position of the center O2 of the second arc 2 is determined, and the second arc 2 is formed.

[0026] Since the third arc 3 is symmetrical with the second arc 2 with the central axis of the cavern section as the axis of symmetry, the center O3 of the third arc is determined to form the third arc 3.

[0027] Draw the middle perpendicular line of the line connecting the tail end of the second arc 2 and the right end point of the bottom surface width, and the intersection point of the middle perpendicular line and the straight line O2O3 is the center O4 of the fourth arc 4, and the distance between the center O4 and the tail end of the second arc 2 is the radius R3 of the fourth arc 4, forming the fourth arc 4' intersecting the bottom surface.

[0028] According to the tangency of the sixth arc 6 and the right end of the bottom plate section 8 and the tail end of the fourth arc 4, the radius R4 of the sixth arc 6 is selected in the optional range, the center O6 is determined, the sixth arc 6 is formed, and the tangency intersection point of the sixth arc 6 and the fourth arc 4 is the tail end of the fourth arc 4.

[0029] According to the symmetry of the fifth arc 5 and the seventh arc 7 with the fourth arc 4 and the sixth arc 6 respectively with the hole section axis as the symmetry axis, the fifth arc 5 and the seventh arc 7 are formed; the tail end of the sixth arc 6 and the seventh arc 7 is connected to form the bottom plate section 8.

[0030] According to the hole section area requirement, the parameters in the above steps are fine-tuned, and the above steps are repeated until the final values B, H, B2 of the hole span, the hole height and the bottom surface width are obtained, and the final section structure of the oil storage hole type is determined.

[0031] The application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method of the above-mentioned oil storage hole type section structure size parameter.

[0032] The application also provides an oil storage hole construction method, which is constructed according to the above-mentioned oil storage hole type section structure, and adopts the drill and blast method, comprising the following steps: Figure 3 As shown in the figure, the hole section is divided into five layers from top to bottom, the heights of the first layer I, the second layer II, the third layer III and the fourth layer IV are all controlled within 7m, and the height of the fifth layer V is 2m-3m.

[0033] The first layer I adopts the mode of excavating the middle pilot hole I1 first and then excavating the left and right side holes I2, which advances in a triangular shape; the second layer II adopts the mode of excavating the first middle groove II1 first and then excavating the left and right first side walls II2; the third layer III adopts the mode of excavating the second middle groove III1 first and then excavating the left and right second side walls III2; the fourth layer IV adopts the mode of excavating the third middle groove IV1 first and then excavating the left and right third side walls IV2; the two side excavation layers of the second layer II, the second layer II and the fourth layer IV adopt the mode of laying a slope. The fifth layer V is excavated separately. After the excavation of each area in each layer is completed, the support is carried out according to the construction sequence. Each layer adopts weak blasting and short footage horizontal control blasting.

[0034] Embodiment

[0035] A certain place in China, the design scale of underground water sealed cave storage engineering is 6 million cubic meters. 14 oil storage caverns are arranged, and the cross section structure of the cave type designed by the application is used, the cross section area is 524 square meters, the span is 22 meters, and the height is 28 meters. The first circular arc 1 has a radius R1 of 10 meters and a central angle alpha of 60 degrees; the second circular arc 2 and the third circular arc 3 have a radius R2 of 12 meters and a central angle beta of 60 degrees, the center distance of the center of the second circular arc 2 and the center of the third circular arc 3 is 2 meters; the fourth circular arc 4 and the fifth circular arc 5 have a radius R3 of 45.608 meters and a central angle gamma of 17.15 degrees, the center distance of the center of the fourth circular arc 4 and the center of the fifth circular arc 5 is 69.216 meters; the sixth circular arc 6 and the seventh circular arc 7 have a radius R4 of 4 meters and a central angle theta of 72.85 degrees, the center distance of the center of the sixth circular arc 6 and the center of the seventh circular arc 7 is 10.3 meters; the width B1 of the bottom plate section 8 is 10.3 meters. The above parameters meet the design requirements.

[0036] The above provides a kind of oil storage cavern cave type cross section structure, computer program product and oil storage cavern construction method provided by the application are introduced in detail. It should be pointed out that for the ordinary skilled person in the art, without departing from the principles of the application, the application can be improved and modified, and these improvements and modifications also fall within the scope of the claims of the application.

Claims

1. An oil storage cavern hole section structure comprising seven circular arc segments and a floor segment; the seven circular arc segments are a first circular arc which is bisected by a hole section central axis, a second circular arc, a fourth circular arc and a sixth circular arc which are sequentially connected with the first circular arc at one end, and a third circular arc, a fifth circular arc and a seventh circular arc which are sequentially connected with the first circular arc at the other end; the first side segment composed of the second circular arc, the fourth circular arc and the sixth circular arc is symmetrically distributed with the second side segment composed of the third circular arc, the fifth circular arc and the seventh circular arc along the hole section central axis; the two ends of the floor segment are respectively tangentially connected with the tail ends of the sixth circular arc and the seventh circular arc; the chords of the seven circular arc segments are all inside the cavern; the length between the tail end of the second circular arc and the tail end of the third circular arc is the cavern span B.

2. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The cavern span B is 15-25 m, and the cavern height H is 20-30 m.

3. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The tail end of the fourth circular arc and the tail end of the fifth circular arc respectively intersect with the cavern bottom surface, and the distance between the two intersection points is the bottom surface width B2, which is 15-20 m.

4. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The radius R1 of the first circular arc is 7-12 m, and the central angle a of the first circular arc is 45-120°.

5. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The radius R2 of the second circular arc is 10-30 m, and the central angle β of the second circular arc is 30-67.5°.

6. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The radius R3 of the fourth circular arc is 20-100 m, and the central angle γ of the fourth circular arc is 10-30°.

7. The oil reservoir cavity hole cross-sectional structure according to claim 1, wherein The radius R4 of the sixth circular arc is 2-5 m, and the central angle θ of the sixth circular arc is 60-80°.

8. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements a method for determining the size parameters of the oil storage cavern hole section structure according to any one of claims 1-7, the method comprising the following steps: S1. According to the size of the oil storage cavern section area, the initial values B', H' and B2' of the cavern span, the cavern height and the bottom surface width are preliminarily determined; S2. The radius R1 and the central angle a are selected, the position of the center O1 on the hole section central axis is determined, and the first circular arc is formed; S3. A ray is formed by connecting the center O1 with the right end point of the first circular arc, the ray is the center O2 of the second circular arc, the radius R2 of the second circular arc is selected, the position of the center O2 of the second circular arc is determined, and the second circular arc is formed according to the fact that the first end of the second circular arc is tangent to the right end point of the first circular arc and the length between the tail end of the second circular arc and the tail end of the third circular arc is the cavern span B'; S4. The center O3 of the third circular arc is determined according to the fact that the third circular arc is symmetric to the second circular arc with the hole section central axis as the axis of symmetry, and the third circular arc is formed; S5. The intersection point of the perpendicular bisector of the line connecting the tail end of the second circular arc and the right end point of the bottom surface width and the straight line on which O2 and O3 lie is the center O4 of the fourth circular arc, the distance between the center O4 and the tail end of the second circular arc is the radius R3 of the fourth circular arc, and the fourth circular arc is formed by intersecting the bottom surface. S6, according to the sixth circular arc and the right end of the bottom plate section and the tail end of the fourth circular arc are tangent, the radius R4 of the sixth circular arc is selected in the optional range, the center O6 is determined, the sixth circular arc is formed, and the tangent intersection point of the sixth circular arc and the fourth circular arc is the tail end of the fourth circular arc; S7, according to the fifth circular arc and the seventh circular arc are symmetrical with the fourth circular arc and the sixth circular arc respectively with the hole section axis as the axis of symmetry, the fifth circular arc and the seventh circular arc are formed; the tail end of the sixth circular arc and the seventh circular arc is connected to form the bottom plate section; S8, according to the hole section area requirement, the parameters in S1 are fine-tuned, steps S1-S7 are repeated, until the final values B, H, B2 of the hole span, the hole height and the bottom surface width are obtained, and the final section structure of the oil storage hole type is determined.

9. A method for constructing an oil storage cavern, comprising constructing the oil storage cavern cross-section structure according to any one of claims 1 to 7, wherein: Drilling and blasting method is adopted for construction, including the following steps: The hole section is divided into five layers from top to bottom, the height of the first layer, the second layer, the third layer and the fourth layer is controlled within 7m, and the height of the fifth layer is 2m-3m; The first layer adopts the method of excavating the middle pilot hole first and then excavating the left and right side holes, which is in the shape of a product; The second layer adopts the method of excavating the first middle groove first and then excavating the left and right first side walls; The third layer adopts the method of excavating the second middle groove first and then excavating the left and right second side walls; The fourth layer adopts the method of excavating the third middle groove first and then excavating the left and right third side walls; The fifth layer is excavated separately; After the excavation of each area in each layer is completed, the support is carried out according to the construction sequence; Each layer adopts weak blasting and short footage horizontal control blasting.

10. The oil reservoir chamber construction method according to claim 9, characterized by, The two side expansion layers of the second layer, the third layer and the fourth layer adopt the type of putting in a slope.

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