CN111364485A - Method for electrochemically reinforcing strip mine slope forward-inclination soft interlayer - Google Patents
Method for electrochemically reinforcing strip mine slope forward-inclination soft interlayer Download PDFInfo
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- CN111364485A CN111364485A CN202010087386.XA CN202010087386A CN111364485A CN 111364485 A CN111364485 A CN 111364485A CN 202010087386 A CN202010087386 A CN 202010087386A CN 111364485 A CN111364485 A CN 111364485A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
Abstract
The invention relates to a method for electrochemically reinforcing a strip mine slope forward-inclination weak interlayer, wherein anodes and cathodes are alternately arranged in the weak interlayer at intervals; all anodes and all cathodes are connected in series through leads respectively and then are connected with a direct current power supply, and the outer end parts of all anodes are communicated with a solution cabin filled with electrolyte solution through a solution conveying pipe; electrolyte solution in the solution bin is conveyed to the inside of the anode metal tube through the solution conveying pipe and overflows from a drilled hole on the surface of the anode and enters the soft interlayer, after the direct-current power supply supplies power to the anode, the anode and the electrolyte solution can perform chemical reaction to form a metal compound and hydrated cations, the metal compound performs a cementing and curing effect on a soil body of the soft interlayer, the potential difference between the anode and the cathode drives water in the soft interlayer to move towards the cathode and enter the inside of the cathode metal tube through the drilled hole, the water freely flows out from the lower end of the cathode metal tube by gravity flow and is discharged out of the soft interlayer, and the reinforcing effect of the soft interlayer is good.
Description
Technical Field
The invention relates to a method for reinforcing a soft interlayer, in particular to a method for electrochemically reinforcing a strip mine slope forward-inclined soft interlayer.
Background
When reinforcing clay rocks and rock formations containing a large amount of clay minerals, the conventional reinforcing effect is often influenced by the characteristics of large viscosity, poor permeability, low strength and the like. Conventional slope reinforcement methods such as anchor cable reinforcement are suitable for the dumping type destruction of the rock stratum with large inclination angle, and the slope reinforcement effect of the gently inclined interlayer is relatively poor. Moreover, the slope reinforcement project needs to consume a large amount of manpower, material resources and financial resources; for strip mines, it is very unfavorable to the overall economic benefit of the mine to invest large economic cost to reinforce the side slope. On the other hand, because the strip mine side slope is not a permanent side slope, along with the continuous development of mining engineering, the side slope structure and service period limit have obvious periodic characteristics, the protection period which can be played by the traditional side slope reinforcement measures is short, the effect of the reinforcement engineering is difficult to fully play, and the waste is caused from the engineering reinforcement angle. Therefore, for the side slope of the strip mine, the side slope protection measure adopted at present is to change the structure and stability of the side slope by adjusting the mining engineering scheme, and the method is at the cost of losing a large amount of resources or sacrificing great economic benefit. At present, grouting reinforcement is the method most suitable for reinforcing the designated range of a forward slope of an open-pit mine, but the method is suitable for rock formations with good rock strength and developed cracks, and effective reinforcement is difficult to realize for weak rock formations with poor permeability. And for the rock stratum softened after the water-rock action, the problem of drainage of the rock mass needs to be solved firstly by adopting a grouting reinforcement measure. Therefore, in order to realize grouting reinforcement of the soft interlayer of the downdip slope of the strip mine, a grouting method which can enhance permeability and effectively remove moisture is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for electrochemically reinforcing a strip mine slope forward-inclined soft interlayer, which has the advantages of strong permeability, good drainage and dispersibility and good reinforcing effect.
In order to achieve the purpose, the invention provides the following technical scheme: a method for electrochemically reinforcing a strip mine slope forward-inclined soft interlayer comprises the following steps that the strip mine slope is divided into a lower hard rock stratum, a soft interlayer and an upper hard rock stratum from bottom to top, and further comprises an electrochemical reinforcing device, wherein the electrochemical reinforcing device comprises a direct-current power supply, an anode, a cathode and a solution bin;
the anode and the cathode are metal tubes with a plurality of drilled holes on the tube walls, and the anode and the cathode are alternately arranged in the weak interlayer at intervals; all anodes are connected in series in sequence through leads and then connected with a direct current power supply, all cathodes are connected in series in sequence through leads and then connected with the direct current power supply, and the outer end parts of all anodes are communicated with a solution cabin filled with electrolyte solution through a solution conveying pipe;
when the thickness of the weak interlayer is not more than 1m, arranging a single row of electrodes in the weak interlayer, and when the thickness of the weak interlayer is more than 1m, arranging a plurality of rows of electrodes in the weak interlayer;
electrolyte solution in the solution bin is conveyed to the inside of the anode metal tube through the solution conveying pipe and overflows from a drilled hole on the surface of the anode into the soft interlayer, the anode and the electrolyte solution can be subjected to chemical reaction after the direct-current power supply supplies power to the anode to form a metal compound and hydrated cations, the metal compound has a cementing and curing effect on a soil body of the soft interlayer, water in the soft interlayer is driven to move towards the cathode by the potential difference between the anode and the cathode and enters the inside of the cathode metal tube through the drilled hole, and the water freely flows out from the lower end of the cathode metal tube by gravity and is discharged out of the soft interlayer.
Further, an ammeter is arranged between the direct current power supply and the anode.
Further, a high-pressure pump is arranged between the anode and the solution cabin.
Further, the anode and the cathode are parallel to each other, and the distance between the anode and the cathode is 1 m.
Furthermore, the inclination angle of the anode and the cathode is consistent with that of the soft interlayer.
Furthermore, the diameter of the anode is 15-35 mm, and a plurality of drilled holes with the diameter of 3mm are uniformly formed in the tube wall.
Furthermore, the diameter of the cathode is 50-100 mm, a plurality of drill holes with the diameter of 5-10 mm are uniformly formed in the tube wall, and the center distance of the drill holes is 150 mm.
Compared with the prior art, the cathode and the anode are arranged in the weak interlayer, the electrolyte solution is subjected to chemical reaction in the weak interlayer to form the metal compound and the hydrated cations, the metal compound has a cementing and curing effect on the soil body of the weak interlayer, and meanwhile, the water in the weak interlayer is driven to be discharged from the cathode by utilizing the potential energy of the electric field, so that the strength of the weak interlayer is improved in two directions. The method provided by the invention can be used for gradually reinforcing the weak rock mass from inside to outside, improving the physical mechanical strength of the rock mass, fundamentally solving the problem that the weak rock mass is easy to deform and slide, and obtaining a better reinforcing effect, saving the reinforcing cost and maintaining the reinforcing effect for a long time compared with the traditional engineering reinforcing method for pressurizing from outside. The method can be used for supplementing and reinforcing the weak interlayer in time when the strength of the weak interlayer is attenuated again or a large amount of surface water permeates into the weak interlayer, and has the advantages of simple and convenient operation and low economic investment.
Drawings
FIG. 1 is a schematic diagram of an electrochemical strengthening scheme when the thickness of a weak interlayer does not exceed 1 m;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic diagram of an electrochemical strengthening scheme for a weak interlayer with a thickness greater than 1 m;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 5 is a structural view of a metal tube of an anode and a cathode;
in the figure: 1. a lower hard rock layer; 2. a soft and weak interlayer; 3. an upper hard rock layer; 4. a direct current power supply; 5. a wire; 6. an ammeter; 7. an anode; 8. a cathode; 9. a solution bin; 10. an electrolyte solution; 11. a high pressure pump; 12. solution delivery pipe.
Detailed Description
The invention will be further explained with reference to the drawings.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the invention provides a technical scheme that a strip mine slope is divided into a lower hard rock stratum 1, a soft interlayer 2 and an upper hard rock stratum 3 from bottom to top, the inclination angle of the soft interlayer 3 is β, and the strip mine slope further comprises an electrochemical reinforcing device, wherein the electrochemical reinforcing device comprises a direct current power supply 4, an anode 7, a cathode 8 and a solution bin 9;
as shown in fig. 5, the anode 7 and the cathode 8 are metal tubes with a plurality of drilled holes on the tube walls, the outer end of the anode 7 is sealed, the outer end of the cathode 8 is open, the anode 7 and the cathode 8 are alternately arranged in the weak interlayer 3 at intervals, the inclination angle of the anode 7 and the cathode 8 is consistent with the inclination angle of the weak interlayer 3, the anode 7 and the cathode 8 are arranged in the middle of the soft interlayer 3, and the outer ends of the anode 7 and the cathode 8 are exposed out of the soft interlayer 3; all the anodes 7 are sequentially connected in series through leads 5 and then connected with the direct current power supply 4, all the cathodes 8 are sequentially connected in series through leads 5 and then connected with the direct current power supply 4, and the outer end parts of all the anodes 7 are communicated with a solution cabin 9 filled with electrolyte solution 10 through a solution conveying pipe 12;
when the thickness of the weak interlayer 3 is not more than 1m, arranging a single row of electrodes in the weak interlayer 3, as shown in fig. 3 and 4, when the thickness of the weak interlayer 3 is more than 1m, arranging a plurality of rows of electrodes in the weak interlayer 3, wherein the single row of electrodes or the plurality of rows of electrodes are arranged at the middle position in the weak interlayer 3, and the plurality of rows of electrodes are parallel to each other and are also in a structure of alternately arranging positive and negative electrodes in the longitudinal direction;
The electrolyte solution 10 is mainly AlCl3Solutions or GaCl3Solution with AlCl3For example, the reaction equation of the electrolyte solution 10 during the energization process is as follows:
2AL(OH)3→AL2O3+3H2O。
it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (7)
1. A method for electrochemically reinforcing a strip mine slope forward-inclined soft interlayer is characterized by further comprising an electrochemical reinforcing device, wherein the electrochemical reinforcing device comprises a direct-current power supply (4), an anode (7), a cathode (8) and a solution bin (9);
the anode (7) and the cathode (8) are metal tubes with a plurality of drilled holes on the tube walls, and the anode (7) and the cathode (8) are alternately arranged in the soft interlayer (3) at intervals; all anodes (7) are sequentially connected in series through leads (5) and then connected with a direct current power supply (4), all cathodes (8) are sequentially connected in series through leads (5) and then connected with the direct current power supply (4), and the outer end parts of all anodes (7) are communicated with a solution cabin (9) filled with electrolyte solution (10) through a solution conveying pipe (12);
when the thickness of the weak interlayer (3) is not more than 1m, a single row of electrodes is arranged in the weak interlayer (3), and when the thickness of the weak interlayer (3) is more than 1m, a plurality of rows of electrodes are arranged in the weak interlayer (3);
electrolyte solution (10) in a solution bin (9) is conveyed to the inside of a metal tube of an anode (7) through a solution conveying pipe (12) and overflows from a drilled hole on the surface of the anode (7) to the inside of a weak interlayer (3), after a direct current power supply (4) supplies power to the anode (7), the anode (7) and the electrolyte solution (10) are subjected to chemical reaction to form a metal compound and hydrated cations, the metal compound has a cementing and curing effect on a soil body of the weak interlayer (3), water in the weak interlayer (3) is driven by the potential difference of the anode (7) and a cathode (8) to move to the cathode (8) and enter the inside of the metal tube of the cathode (8) through the drilled hole, and freely flows out of the lower end of the metal tube of the cathode (8) by gravity and is discharged out of the weak interlayer (3).
2. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: an ammeter (6) is arranged between the direct current power supply (4) and the anode (7).
3. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: and a high-pressure pump (11) is arranged between the anode (7) and the solution bin (9).
4. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: the anode (7) and the cathode (8) are parallel to each other, and the arrangement distance is 1 m.
5. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: the inclination angle of the anode (7) and the cathode (8) is consistent with that of the soft interlayer (3).
6. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: the diameter of the anode (7) is 15-35 mm, and a plurality of drilled holes with the diameter of 3mm are uniformly formed in the tube wall.
7. The method for electrochemically reinforcing the slope soft interbedded layer of the strip mine according to claim 1, wherein the method comprises the following steps: the diameter of the cathode (8) is 50-100 mm, a plurality of drill holes with the diameter of 5-10 mm are uniformly formed in the tube wall, and the center distance of the drill holes is 150 mm.
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| CN202010087386.XA CN111364485A (en) | 2020-02-11 | 2020-02-11 | Method for electrochemically reinforcing strip mine slope forward-inclination soft interlayer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980433A (en) * | 2020-07-21 | 2020-11-24 | 河海大学 | Electrochemical nondestructive repair method for weak structural surface of ancient city wall |
| CN113106963A (en) * | 2021-03-26 | 2021-07-13 | 中煤科工集团沈阳研究院有限公司 | Electrochemical grouting treatment method for side slope based on pile forming effect |
| CN113123316A (en) * | 2021-04-08 | 2021-07-16 | 南通大学 | Device and method for testing effective potential of soil body in real time in soft clay electroosmosis process |
| CN113846656A (en) * | 2021-09-16 | 2021-12-28 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
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| CN106284292A (en) * | 2015-06-09 | 2017-01-04 | 江苏德盈土工材料有限公司 | A kind of consolidating mud soil electrochemical modification hardened system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980433A (en) * | 2020-07-21 | 2020-11-24 | 河海大学 | Electrochemical nondestructive repair method for weak structural surface of ancient city wall |
| CN113106963A (en) * | 2021-03-26 | 2021-07-13 | 中煤科工集团沈阳研究院有限公司 | Electrochemical grouting treatment method for side slope based on pile forming effect |
| CN113123316A (en) * | 2021-04-08 | 2021-07-16 | 南通大学 | Device and method for testing effective potential of soil body in real time in soft clay electroosmosis process |
| CN113123316B (en) * | 2021-04-08 | 2022-03-08 | 南通大学 | Device and method for testing effective potential of soil body in real time in soft clay electroosmosis process |
| CN113846656A (en) * | 2021-09-16 | 2021-12-28 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
| CN113846656B (en) * | 2021-09-16 | 2022-12-13 | 沈阳建筑大学 | Device for reinforcing multi-layer soft rock slope of strip mine |
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Application publication date: 20200703 |