CN114922156A - Underground karst cave processing method and structure - Google Patents
Underground karst cave processing method and structure Download PDFInfo
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- CN114922156A CN114922156A CN202210622799.2A CN202210622799A CN114922156A CN 114922156 A CN114922156 A CN 114922156A CN 202210622799 A CN202210622799 A CN 202210622799A CN 114922156 A CN114922156 A CN 114922156A
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- filling
- karst cave
- mould
- cavern
- space
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Abstract
The invention provides an underground karst cave processing method, which belongs to the technical field of karst cave processing and comprises the following steps: according to the space form of the karst cave, a plurality of drill holes communicated with the karst cave are arranged on the ground; determining a filling mold to be used, and then putting the filling mold into the karst cave through drilling; wherein, the filling mould has two using states of compression and expansion; arranging a plurality of filling holes communicated with the karst cave; expanding the filling mould, wherein the volume of the expanded filling mould is smaller than that of the karst cave, and then pouring concrete into a space between the karst cave and the filling mould through the pouring hole; sealing the water injection hole and the perfusion hole; and taking out the filling mould after the concrete is solidified to form a shell structure. The invention effectively solves the technical problems that the traditional filling method in the prior art can not form a structural body with a supporting function in the cavity body, and has large filling engineering quantity and high manufacturing cost. The invention also provides an underground karst cave processing structure.
Description
Technical Field
The invention belongs to the technical field of karst cave processing, and particularly relates to an underground karst cave processing method and structure.
Background
The karst cave is an underground corrosion phenomenon formed by the chemical action and the mechanical destruction action of surface water and underground water on a soluble rock stratum, and the stability and the mechanical distribution of surrounding rocks around the geologic site can be influenced. Soil caverns are common engineering geological problems in karst areas. When reservoirs are built, tunnels are excavated, mineral deposits are excavated, or buildings are constructed, leakage, collapse, and water gushing may be caused, causing damage.
The common soil cavern treatment method is mainly a filling method, and the filling material comprises hard materials such as concrete, medium coarse sand and the like. The filling (namely karst grouting) aiming at the karst collapse area is to fill cement slurry by drilling holes, block the karst cave space at the shallow part, cut off the undermining migration channel of underground water to the overlying soil body, eliminate the basic condition of karst collapse, and achieve the purpose of preventing the collapse.
The traditional filling method cannot form a structural body with a supporting function in the hole body, and has the defects of large filling engineering quantity and high manufacturing cost.
Disclosure of Invention
The invention aims to provide an underground karst cave treatment method and structure, and aims to solve the technical problems that a traditional filling method in the prior art cannot form a structural body with a supporting effect in a cave body, and the traditional filling method is large in filling engineering quantity and high in manufacturing cost.
In order to achieve the purpose, the invention adopts the technical scheme that: the underground karst cave processing method comprises the following steps:
step 5, closing the water injection hole and the injection hole; and taking out the filling mould after the concrete is solidified to form a shell structure.
Preferably, the step 1 comprises the steps of:
step 1.1, determining the arrangement number of the shell structures according to the space form of the karst cave;
and 1.2, marking the position of the shell structure on the ground, and then punching at the marked position to communicate the drilled hole with the karst cave.
Preferably, the size of the space between the adjacent shell structures in the step 1.1 is 1.2 to 3 times of the size of the height of the cavern.
Preferably, the filling mould comprises one or more of an elastic film, an elastic bag body and an air bag structure.
Preferably, before the filling mould is placed into the karst cave, measuring the inflation pressure P of the filling mould when the height of the filling mould is 5mm-10cm lower than the height of the cave body; and filling the space between the karst cave and the filling mould with concrete, wherein the pressure intensity in the filling mould is P.
Preferably, the medium injected into the filling mold is water; the density of the concrete is the same as that of water; the shape of the formed shell structure 2 is adjusted by adjusting the relative pressure of the water pressure in the filling mould and the concrete outside.
Preferably, the filling mould is communicated with a water injection pipe; the upper part of the water injection pipe is higher than the ground; the size of the middle space between the adjacent shell structures is 1.5 times of the height of the karst cave.
Preferably, the method further comprises the following steps: and 6, injecting water into the inner space of the shell structure, and then closing the drilled hole.
The invention also includes an underground cavern processing structure, comprising:
the filling mould is arranged in the karst cave and is communicated with the external environment; the filling mould has two using states of compression and expansion;
and the shell structure is filled in the space between the karst cave and the filling mould.
Preferably, the filling mold comprises one or more of an elastic film, an elastic bag body and an air bag structure.
The underground karst cave processing method and the underground karst cave processing structure have the advantages that: compared with the prior art, the underground cavern treatment method and the underground cavern treatment structure have the advantages that the characteristic that the space shell has super-strong compressive resistance is utilized, low-density foam lightweight concrete is selected as a filling material, and a filling mold for injecting water is arranged in the cavern body to serve as a shaping mold, so that the space concrete shell is formed in the cavern body; the filling mould has elasticity, can be recycled for multiple times, and further reduces the cost input; the water pressure formed by the water in the filling mould has a compensation effect on the soil pressure outside the shell structure, and the safety storage is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram illustrating a method for processing a subsurface cavern according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for processing a subsurface cavern according to an embodiment of the present invention.
An icon: 1. filling the mold; 2. a housing structure; 3. a water injection pipe; 4. and (4) filling a pipe.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1-2, a method and structure for processing a cave will now be described. The underground karst cave processing method comprises the following steps:
s1, arranging a plurality of drill holes communicated with the karst cave on the ground according to the space form of the karst cave;
the step S1 can be realized by the following steps:
s1.1, determining the arrangement number of the shell structures 2 according to the space form of the karst cave;
the number of shell structures 2 is determined according to the aspect ratio of the underground cavern.
The number of shells can be determined according to the aspect ratio of the cavern space, and when the aspect ratio is less than 3, 1 shell structure 2 is arranged. When the aspect ratio is greater than 3, the shell structures 2 are arranged in a triangular shape at intervals of 1.5 times the average hole height. The plan arrangement of the shell structures 2 is identical to the plan arrangement of the drilling placement filling moulds, one for each shell structure 2. The planar arrangement may take the form of a triangle or a square. The adoption of the triangle can reduce the volume of the concrete among the filling bodies to the maximum extent, reduce the engineering quantity of the concrete and reduce the manufacturing cost.
The size of the space between the adjacent shell structures 2 is 1.2 to 3 times of the height of the karst cave. More specifically, the intermediate space between adjacent shell structures 2 is 1.5 times the size of the cavern height.
The hole height is the average hole height. The distance between the centers of the adjacent shell structures 2 is 1.5 times of the average height of the karst cave, the shell structures 2 are approximately circular, and the clear distance between the adjacent shell structures 2 (the interval between the outer side surfaces of the adjacent shell structures 2) is about 0.5 times of the height of the cave.
The hole height should theoretically be the height of the hole body at the position of the drilled hole, and a profile map for design reference is generated in the basic data (survey data) of the karst cave processing. The average height can be adopted for preliminary arrangement when preliminarily determining the spacing of the shell structure, and then the average height is properly adjusted according to the specific height at each point.
The drilling hole spacing is determined by referring to the hole height, so that the foam concrete cavity is ensured to have enough strength to support the upper part and the side load while the maximum increase of the shell volume, the reduction of the pouring amount of the foam concrete and the reduction of the manufacturing cost are considered.
And S1.2, marking the position of the shell structure 2 on the ground, and then punching the marked position to communicate the drilled hole with the karst cave. More specifically, the lower end of the bore hole is flush with the ceiling of the cavern.
Step S2, determining a filling mould 1 to be used, and then putting the filling mould 1 into the karst cave through drilling; wherein, the filling mould 1 has two using states of compression and expansion;
the filling mold 1 comprises one or more of an elastic film, an elastic bag body and an air bag structure.
The filling mold 1 is used as an elastic film for description, and it should be noted that when the filling mold 1 is an elastic bag or an airbag structure, the operation steps are the same as those of the filling mold, and therefore, the description thereof is omitted in the present invention.
Before the filling mould 1 is placed into the karst cave, measuring the inflation pressure P of the filling mould 1 when the height of the filling mould 1 is 0.5mm-10cm lower than the height of the cave body; the filling mould 1 is then placed in a compressed state and the filling mould 1 is then placed into the cavern by drilling.
The filling mould 1 is communicated with a water injection pipe 3; the upper part of the water injection pipe 3 is higher than the ground. The water injection pipe 3 is communicated with the filling mould 1 through a drill hole. The outlet of the filling mould 1 is positioned at the elevation of the hole top and is communicated with the water injection pipe 3.
S3, arranging a plurality of filling holes communicated with the karst cave; the infusion holes are arranged between adjacent boreholes. Or the infusion orifice is located adjacent to either borehole.
And step S4, expanding the filling mould 1, wherein the volume of the expanded filling mould 1 is smaller than that of the karst cave, and then pouring concrete into the space between the karst cave and the filling mould 1 through the pouring hole.
And a filling pipe 4 penetrates through the through hole, one end of the filling pipe 4 is communicated with the space between the karst cave and the filling mould 1, and the other end of the filling pipe is communicated with the external environment. The arrangement of the filling pipe 4 improves the efficiency of concrete flowing down. Concrete is prevented from being bonded in the filling hole.
The concrete fills the space between the cavern and the filling mould 1, and the pressure inside the filling mould 1 in the expansion state is P at the moment.
Wherein, the space between concrete filling karst cave and filling mould 1 includes following several:
example one, when concrete is injected into the space between the cavern and the filling mold 1, the filling mold 1 is gradually expanded synchronously until the filling mold is expanded to a preset state. When the hole body is filled with concrete, the pressure intensity of each position in the filling mould 1 is P;
example two, the filling mold 1 is expanded to a predetermined state, and then concrete is injected into a space between the cavern and the filling mold 1.
Example three, the required weight of the individual shell structures 2 is calculated, then concrete is injected into the cavern first, and then the filling mould 1 is expanded to a predetermined state.
The medium injected into the filling mould 1 is water. The concrete is light foam concrete, and the density of the concrete is the same as that of water.
Step S5, sealing the water injection hole and the injection hole; after the concrete has set to form the shell structure 2, the filling mould 1 is changed from the expanded state to the compressed state along the filling mould 1 and the filling mould 1 is then removed from the borehole. And then sealing the drilled hole. The shell structure 2 has space stress characteristics and can bear huge confining pressure.
Example two
The invention also provides a method for treating the underground cavern, which is characterized in that the filling mold 1 is taken out from the drilled hole in step S5, and the drilled hole is not closed immediately. Instead, step 6 is used, in which water is injected into the inner space of the shell structure through the drill hole and the drill hole is then closed.
Compared with the prior art, the underground cavern treatment method provided by the invention takes the space effect of the cavern into consideration, utilizes the characteristic that the space shell has super-strong pressure resistance, selects low-density foam lightweight concrete as a filling material, and forms the space concrete shell in the cavity by arranging a filling mould 1 for water injection in the cavity as a shaping mould; the filling mould 1 has elasticity and can be recycled for multiple times, so that the cost input is further reduced; the water pressure formed by the water in the filling mould 1 has a compensation effect on the soil pressure outside the shell structure 2, and the safety reserve is improved.
The concrete space cavity with compressive strength has great capacity of resisting external pressure, just as a thin eggshell can resist great external pressure, a spherical concrete cavity (namely the shell structure 2) of a space is formed in the karst cave body, and the engineering quantity of concrete pouring can be greatly reduced.
One or more drill holes are arranged on the ground according to the aspect ratio of the cavern, and the high-elasticity filling mold 1 is placed into the cavity through the drill holes. And injecting water into the filling mould 1, and pouring foam lightweight concrete outside the cavity. After the concrete is solidified, one or a plurality of closed concrete cavities (namely, the shell structure 2) are formed inside the karst cave. By adjusting the density of the foam lightweight concrete, the relative pressure between the water pressure in the filling mould 1 and the external foam lightweight concrete can be adjusted, and further the shape of the cavity is adjusted, so that the shell structure is in the optimal state of resisting the pressure of the surrounding soil.
After the concrete is solidified, the filling mould 1 in the cavity can be taken out and recycled for multiple utilization. The housing structure 2 is refilled with water and the water pressure can further resist the earth pressure outside the cavity. The technology can greatly reduce the filling volume of the large karst cave and reduce the engineering investment by more than 50 percent.
EXAMPLE III
The present invention also provides a structure for processing a cave, please refer to fig. 1-2, which includes: the filling mold 1 is arranged in the karst cave and is communicated with the external environment; the filling mould 1 has two use states of compression and expansion; the shell structure 2 is filled in the space between the cavern and the filling mold 1.
In the present embodiment, the filling mold 1 includes one or more of an elastic film, an elastic bag body, and an airbag structure.
In this embodiment, the underground cavern processing structure further includes a filling medium filled in the shell structure 2.
In the present embodiment, the bottom of the filling mold 1 is provided with a flow control valve for the liquid in the filling mold 1 to flow into the shell structure 2, and the flow control valve is in communication connection with the controller in a wireless manner. The operator can discharge the liquid in the filling mould 1 by means of the controller. The filling medium can now be located in the filling tool 1, and then when the filling tool 1 needs to be removed, the flow control valve opens so that the liquid in the filling tool 1 flows into the housing structure 2, while the filling tool 1 is slowly removed from the borehole.
This underground cavern processing structure has reduced operating procedure through the setting that increases the circulation control valve, has improved the operating efficiency.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the technical scope of the present invention, and the technical scope of the present invention is covered by the modifications or alternatives. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for treating underground karst caves is characterized by comprising the following steps:
step 1, arranging a plurality of drill holes communicated with a karst cave on the ground according to the space form of the karst cave;
step 2, determining a filling mold to be used, and then placing the filling mold into the karst cave through drilling; wherein the filling mold has two use states of compression and expansion;
step 3, distributing a plurality of filling holes communicated with the karst cave;
step 4, expanding the filling mould, wherein the volume of the expanded filling mould is smaller than that of the karst cave, and then pouring concrete into a space between the karst cave and the filling mould through the pouring hole;
step 5, sealing the water injection hole and the injection hole; and taking out the filling mould after the concrete is solidified to form a shell structure.
2. The underground cavern processing method as recited in claim 1, wherein the step 1 comprises the following steps:
step 1.1, determining the arrangement number of the shell structures according to the space form of the karst cave;
and 1.2, marking the position of the shell structure on the ground, and then punching the marked position to communicate the drilled hole with the karst cave.
3. The underground cavern processing method of claim 2, wherein the interval between the adjacent shell structures in the step 1.1 is 1.2 to 3 times of the height of the cavern.
4. The method of claim 3, wherein the filling mold comprises one or more of an elastic film, an elastic bag body, and an air bag structure.
5. The underground cavern processing method of claim 4, wherein before the filling mold is placed into the cavern, the inflation pressure P of the filling mold is measured when the height of the filling mold is 5mm to 10cm lower than the height of the cavern body; and filling the space between the karst cave and the filling mould with concrete, wherein the pressure intensity in the filling mould is P.
6. The underground cavern processing method of claim 5, wherein the medium injected into the filling mold is water; the density of the concrete is the same as that of water; the shape of the formed shell structure 2 is adjusted by adjusting the relative pressure of the water pressure in the filling mould and the concrete outside.
7. The underground cavern processing method of claim 6, wherein the filling mold is communicated with a water injection pipe; the upper part of the water injection pipe is higher than the ground; the size of the middle space between the adjacent shell structures is 1.5 times of the height of the karst cave.
8. The method for treating underground caverns as recited in any one of claims 1 to 7, further comprising: and 6, injecting water into the inner space of the shell structure, and then closing the drilled hole.
9. An underground cavern processing structure, comprising:
the filling mould is arranged in the karst cave and is communicated with the external environment; the filling mould has two using states of compression and expansion;
and the shell structure is filled in the space between the karst cave and the filling mould.
10. A subsurface cavern processing structure as recited in claim 9, wherein: the filling mold comprises one or more of an elastic film, an elastic bag body and an air bag structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210622799.2A CN114922156A (en) | 2022-06-02 | 2022-06-02 | Underground karst cave processing method and structure |
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| CN202210622799.2A CN114922156A (en) | 2022-06-02 | 2022-06-02 | Underground karst cave processing method and structure |
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| CN202210622799.2A Pending CN114922156A (en) | 2022-06-02 | 2022-06-02 | Underground karst cave processing method and structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116289878A (en) * | 2023-04-27 | 2023-06-23 | 中建七局第二建筑有限公司 | Improved bag type injection treatment method for filling logistics of karst filled karst cave |
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| CN212671678U (en) * | 2020-05-09 | 2021-03-09 | 中国石油天然气集团有限公司 | Leakage stopping tool |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101680072B1 (en) * | 2015-07-29 | 2016-11-28 | 이장희 | Method for reducing noise of floor in underground parking lot |
| CN109356171A (en) * | 2018-11-28 | 2019-02-19 | 中国十七冶集团有限公司 | A kind of device and its operating method blocking solution cavity using rubber bag |
| CN109750662A (en) * | 2019-01-10 | 2019-05-14 | 湖北工业大学 | A kind of method for constructing foundation pile passing through solution cavity section |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116289878A (en) * | 2023-04-27 | 2023-06-23 | 中建七局第二建筑有限公司 | Improved bag type injection treatment method for filling logistics of karst filled karst cave |
| CN116289878B (en) * | 2023-04-27 | 2024-03-22 | 中建七局第二建筑有限公司 | Improved bag type injection treatment method for filling logistics of karst filled karst cave |
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