Underground water-sealed cavern large-span storage cavern excavation method based on unfavorable geological section
By excavating the guide holes in the groundwater sealing reservoir in the poor geological section only on the top and bottom floors, the problems of time-consuming, labor-intensive and high safety risks in the existing technology are solved, and a simple, safe and efficient cave excavation method is achieved.
Patent Information
- Application Number
- CN202510651016.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-07-22
AI Technical Summary
The prior art excavation of large-span storage chambers in groundwater sealing reservoirs in poor geological sections is time-consuming, labor-intensive, and financially expensive, and has high safety risks.
The method of excavating medium guide holes on the top and bottom layers is adopted, with the ventilation phase and liquid phase of the medium guide holes, and other surrounding rocks are retained and not excavated, and the reservoir capacity is supplemented through excavation of excellent geological sections.
It effectively avoids the safety risks of bad geological hole sections, has simple construction, flexible layout, high craftsmanship, high safety and saves investment.
Smart Images
Figure CN120350993A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of the excavation of underground water-sealed cavern storages, and particularly relates to an excavation method for a large-span storage cavern of an underground water-sealed cavern based on a poor geological section. Background Art
[0002] In recent years, underground water-sealed cavern storages mainly store media such as crude oil or liquefied petroleum gas. The cross-sectional shapes of the storage caverns generally adopt forms such as curved wall shapes and city gate shapes (straight wall circular arch shapes), with large spans, high side walls, arranged in parallel at the same height. Multiple caverns are connected and penetrated through the connecting roadways between adjacent caverns to keep the media flowing and connected. The excavation of the caverns generally adopts a method of first excavating in layers and then in parts. The number of excavation layers is generally 3 to 4 layers, namely the top layer, the middle layer (which can be 1 to 2 layers), and the bottom layer. The excavation in parts generally adopts a method of first excavating the middle pilot tunnel and then following up with the excavation of the surrounding rocks on both sides, or first excavating one half side and then the other half side, and there is also a method of excavating the whole section at one time without dividing parts.
[0003] When, through geological exploration and advanced prediction, the section in front of the heading face is a poor geological section, there are mainly two methods currently adopted in engineering: one is to improve the support grade of the surrounding rock, that is, to pass through after strong support and keep the original shape of the cavern unchanged; the other is to reduce the section, change the shape of the cavern, and keep the penetration of each layer of the cavern section. The defect of the former is that strong support often requires setting up steel arch frames or making reinforced concrete secondary linings. At the same time, during the excavation of the middle and bottom layers, the arch frames or secondary linings need to be transitionally connected, and the treatment is cumbersome. Although various risk factors are controllable, the overall safety level is relatively low, and it is time-consuming, laborious, and costly; the defect of the latter is that no matter how the shape changes, in order to keep the penetration of each layer of the cavern section, although the span is reduced, the horizontal deformation of the surrounding rock under the high side wall may instead increase rather than decrease, and strong support still needs to be carried out, and various risk factors are reduced limitedly. Summary of the Invention
[0004] Aiming at the deficiencies of the prior art, the present invention provides an excavation method for a large-span storage cavern of an underground water-sealed cavern based on a poor geological section, and solves the problems that the excavation of the storage cavern of the underground water-sealed cavern in a poor geological section is time-consuming, laborious, costly, and has a relatively high safety risk.
[0005] To achieve the above object, the present invention is realized through the following technical solutions:
[0006] An excavation method for a large-span storage cavern of an underground water-sealed cavern based on a poor geological section, the excavation method comprising:
[0007] During the excavation of the top layer of the storage cavern, according to geological exploration and advanced prediction, determine the length of the poor geological section in front of the heading face;
[0008] Excavate a first pilot tunnel through the poor geological section at the top layer heading face, and do not excavate the first surrounding rocks on both side walls of the first pilot tunnel;
[0009] The middle layer is reserved without excavation;
[0010] In the bottom layer, the second middle pilot tunnel is excavated through the poor geological tunnel section, and the second surrounding rock on both side walls of the second middle pilot tunnel is reserved without excavation;
[0011] The storage capacity occupied by the rock mass reserved without excavation is supplemented by excavation in other excellent geological tunnel sections.
[0012] Preferably, the cross-sectional shapes of the first middle pilot tunnel and the second middle pilot tunnel are both portal shapes.
[0013] Preferably, the cross-sectional sizes of the first middle pilot tunnel and the second middle pilot tunnel are determined according to the requirements of water supply, power supply, air supply and traffic for underground engineering construction.
[0014] The present invention provides a method for excavating a large-span storage chamber of an underground water-sealed storage cavern based on a poor geological section. Compared with the prior art, it has the following beneficial effects:
[0015] In the present invention, the excavation method of the storage chamber is changed, that is, the middle pilot tunnels are only excavated at the working faces of the top layer and the bottom layer. The top middle pilot tunnel conducts gas phase and liquid phase, and the bottom middle pilot tunnel conducts liquid phase, and the rest of the surrounding rock is reserved without excavation; this method effectively avoids various safety risks such as geology and construction in the poor geological tunnel section of the large-span storage chamber, is simple in construction, flexible in layout, high in work efficiency, high in safety, and saves investment. Description of the Drawings
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0017] Figure 1 It is a flow chart of the excavation method in the embodiment of the present invention.
[0018] Figure 2 It is an axonometric perspective view of the excavation of a large-span storage chamber of an underground water-sealed storage cavern based on a poor geological section in the embodiment of the present invention.
[0019] Figure 3 It is a front view of the excavation of a large-span storage chamber of an underground water-sealed storage cavern based on a poor geological section in the embodiment of the present invention.
[0020] The reference numerals in the drawings are set as follows: top layer 1, first middle pilot tunnel 2, first surrounding rock 3, middle layer 4, bottom layer 5, second middle pilot tunnel 6, second surrounding rock 7. Detailed Embodiments
[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0022] By providing an excavation method for large-span storage caverns in a groundwater-sealed cavern storage based on poor geological sections, the embodiments of the present application solve the problems of time-consuming, laborious, and costly excavation of storage caverns in a groundwater-sealed cavern storage in poor geological sections and relatively high safety risks.
[0023] To better understand the above technical solutions, the following will describe the above technical solutions in detail in conjunction with the accompanying drawings of the specification and specific implementation manners.
[0024] Embodiment:
[0025] As Figures 1-3 shown, the present invention provides an excavation method for large-span storage caverns in a groundwater-sealed cavern storage based on poor geological sections. The excavation method includes:
[0026] S1. When excavating the top layer 1 of the storage cavern (gate-shaped, with a height of 29 m and a width of 20 m), according to geological exploration and advanced prediction, it is determined that the surrounding rock grade within a range of 22 m in front of the heading face is grade IV - V, belonging to a poor geological tunnel section;
[0027] S2. The height of the top layer 1 is 8 m. The heading face excavates the first pilot tunnel 2 through the poor geological tunnel section. The height of the first pilot tunnel 2 is the same as the height of the top layer, and the width is determined to be 8 m according to the requirements of water, electricity, ventilation, and mechanical access traffic. The first surrounding rock 3 on both side walls of the pilot tunnel is reserved without excavation;
[0028] S3. The height of the middle layer 4 is 14 m, including 2 sub-layers with heights of 7 m and 7 m respectively, and no excavation is carried out;
[0029] S4. The height of the bottom layer 5 is 7 m. The second pilot tunnel 6 is excavated through the poor geological tunnel section. The second surrounding rock 7 on both side walls of the pilot tunnel is reserved without excavation. The height of the second pilot tunnel 6 is the same as the height of the bottom layer, and the width is 8 m;
[0030] S5. The storage capacity occupied by the reserved first surrounding rock 3, the middle layer 4, and the second surrounding rock 7 is approximately 9300 m 3 , and the storage capacity is supplemented by extending and expanding 16 m in the excellent geological tunnel section of the end wall in the length direction of the storage cavern.
[0031] In summary, compared with the prior art, the present invention has the following beneficial effects:
[0032] In the embodiments of the present invention, the excavation method of the storage chamber is changed, that is, pilot tunnels are only excavated at the headings of the top and bottom layers. The top pilot tunnel conducts gas phase and liquid phase, and the bottom pilot tunnel conducts liquid phase, while the remaining surrounding rocks are left unexcavated. This method effectively avoids various safety risks such as geology and construction in the poor geological section of the large-span storage chamber, is simple in construction, flexible in layout, high in work efficiency, high in safety, and saves investment.
[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.
[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A large-span storage cavern excavation method for a groundwater-sealed cavern repository based on a poor geological section, characterized in that The excavation method includes: During the excavation of the top layer of the storage chamber, determine the length of the section with poor geological conditions in front of the tunnel face according to geological exploration and advanced prediction; Excavate the first pilot tunnel (2) at the tunnel face of the top layer (1) to pass through the section with poor geological conditions, and leave the first surrounding rock (3) on both side walls of the first pilot tunnel (2) unexcavated; Leave the middle layer (4) unexcavated; Excavate the second pilot tunnel (6) at the bottom layer (5) to pass through the section with poor geological conditions, and leave the second surrounding rock (7) on both side walls of the second pilot tunnel (6) unexcavated; The storage capacity occupied by the unexcavated rock mass is supplemented by expanding the excavation in other sections with good geological conditions.
2. The excavation method for the large-span storage cavern in the groundwater-sealed cavern repository based on the poor geological section according to claim 1, wherein The cross-sectional shapes of the first pilot tunnel (2) and the second pilot tunnel (6) are both portal-shaped.
3. The excavation method of the large-span storage cavern in the groundwater-sealed cavern storage based on the poor geological section according to claim 1, characterized in that, The cross-sectional sizes of the first pilot tunnel (2) and the second pilot tunnel (6) are determined according to the requirements of water supply, power supply, air supply and traffic for underground engineering construction.