CN111877262B - Antiseep structure in old bittern salt pan - Google Patents
Antiseep structure in old bittern salt pan Download PDFInfo
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- CN111877262B CN111877262B CN202010754251.4A CN202010754251A CN111877262B CN 111877262 B CN111877262 B CN 111877262B CN 202010754251 A CN202010754251 A CN 202010754251A CN 111877262 B CN111877262 B CN 111877262B
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- seepage
- sodium chloride
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an anti-leakage structure of a bittern field, which comprises a foundation dam body constructed around the bittern field, a base groove excavated downwards from the top of the foundation dam body, and an anti-seepage layer formed by filling tail salt in the base groove and tamping, wherein the tail salt at least comprises granular sodium chloride, bittern is poured in the anti-seepage layer, the bittern at least comprises sodium chloride and magnesium chloride in a saturated state, and part of granular sodium chloride in the anti-seepage layer is dissolved in the bittern to form a compact sodium chloride crystal structure in the anti-seepage layer. The anti-seepage structure of the old brine salt field prevents old brine in the old brine salt field from permeating outwards through the anti-seepage layer in the base groove, compared with the black mud sandwich anti-seepage structure, the anti-seepage structure has the same or even better anti-seepage effect, and the salt field tail salt waste residue is used nearby without long-distance transportation, so that the cost is low and the use is convenient.
Description
Technical Field
The invention relates to the technical field of dam construction, in particular to an anti-seepage structure of an old brine salt pan.
Background
In the production process of the salt field, the brine in the salt field is easy to leak, the salt field dam is gradually dissolved to destroy the salt field dam, and once the brine leaks underground, the brine is dispersed and absorbed and is difficult to recover again. Therefore, salt field dams generally adopt anti-seepage measures, common anti-seepage measures comprise a plurality of methods such as clay mechanical tamping anti-seepage, plastic film anti-seepage, black mud sandwich anti-seepage, biological anti-seepage, chemical seepage release and the like, and at present, clay mechanical tamping and black mud sandwich anti-seepage methods are mostly adopted in the salt lake region of the chaulmoogra.
The clay mechanical tamping seepage-proofing method is most convenient, the cost is lowest, but the seepage-proofing effect is the worst. The clay has strong colloid property, when the clay layer is thicker, the gaps in the soil structure can be reduced by applying enough pressure to the clay layer, and the clay forms a more compact impermeable layer. However, in salt lake regions, clay layers are generally thin and unevenly distributed, and the salt lake regions are not suitable for building large-area salt fields.
The black mud sandwich seepage-proofing method is characterized by that on the basis of clay mechanical tamping seepage-proofing method a layer of black mud with high viscosity and good seepage-proofing property is filled in the middle of dam body so as to raise the seepage-proofing effect of dam body. But the black mud is restricted by the storage amount, needs to be transported for a long distance and is difficult to use for a long time.
Disclosure of Invention
The invention aims to provide an anti-seepage structure of an old brine salt pan so as to solve the problems that the clay seepage-proofing effect is poor and the black mud sandwich seepage-proofing is limited by the storage amount in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: the anti-leakage structure comprises a foundation dam body constructed around the old bittern salt field, a base groove excavated downwards from the top of the foundation dam body, and an anti-seepage layer formed by filling tail salt in the base groove and tamping, wherein the tail salt at least comprises granular sodium chloride, old bittern is poured in the anti-seepage layer, the old bittern at least comprises sodium chloride and magnesium chloride in a saturated state, and part of granular sodium chloride in the anti-seepage layer is dissolved in the old bittern to form a compact sodium chloride crystal structure in the anti-seepage layer.
Further, the height of the foundation trench is greater than that of the foundation dam body.
Furthermore, the tail salt in the basic groove is buried for multiple times, and old brine is poured after the tail salt is buried once and tamped.
Further, the foundation trench is arranged on the inner side of the foundation dam body close to the old brine salt pan.
Further, the cross section of the base groove is rectangular.
Further, the tail salt is tail salt discharged by a direct flotation process and at least comprises 65.23% +/-5% of sodium chloride and 3.64% +/-1% of magnesium chloride in percentage by weight.
Further, the old bittern at least comprises 33.5-36 wt% of magnesium chloride and 0.3-1.0 wt% of sodium chloride.
Compared with the prior art, the anti-seepage structure of the old brine salt pan provided by the invention has the following advantages:
according to the anti-seepage structure of the old brine salt pan, old brine in the old brine salt pan is prevented from permeating outwards through the anti-seepage layer in the base groove, the old brine at least comprises sodium chloride and magnesium chloride in a saturated state, according to solubility data, in a multi-element system, when the magnesium chloride is in the saturated state, the sodium chloride is close to the saturated state, the anti-seepage layer is formed by tail salt, the tail salt contains granular sodium chloride, part of granular sodium chloride in the anti-seepage layer is dissolved into the old brine, so that the sodium chloride in the old brine is in the saturated state, and a compact sodium chloride crystal structure is formed in the anti-seepage layer, so that the leakage is prevented.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of an anti-seepage structure of a preferred embodiment of the old brine salt pan provided by the invention;
fig. 2 is a method for constructing an anti-seepage structure of the old brine salt pan shown in fig. 1.
Reference numerals:
1-foundation dam body and 2-foundation groove.
Detailed Description
The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific examples described in the following embodiments of the present invention are merely illustrative of specific embodiments of the present invention and do not limit the scope of the invention.
The invention is further described with reference to the following figures and detailed description of embodiments.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an anti-seepage structure of a preferred embodiment of the old bittern salt field provided by the present invention.
The embodiment is an anti-leakage structure of an old brine salt pan, the anti-leakage structure comprises a foundation dam body 1 constructed around the old brine salt pan, a base groove 2 excavated downwards from the top of the foundation dam body 1, and an anti-seepage layer formed by filling tail salt in the base groove 2 and tamping, wherein the tail salt at least comprises granular sodium chloride, old brine is poured in the anti-seepage layer, the old brine at least comprises sodium chloride and magnesium chloride in a saturated state, part of granular sodium chloride in the anti-seepage layer is dissolved in the old brine, and a compact sodium chloride crystal structure is formed in the anti-seepage layer.
The utility model provides an antiseep structure in old bittern salt pan prevents the old bittern in the old bittern salt pan outwards to permeate through the barrier in the basic groove, old bittern includes sodium chloride at least and the magnesium chloride that is the saturated condition, and can know according to solubility data, in many systems, when magnesium chloride is the saturated condition, sodium chloride is close the saturated condition, and the barrier is formed by the tail salt, and the tail salt contains graininess sodium chloride, some graininess sodium chloride in the barrier dissolve extremely in the old bittern, make sodium chloride in the old bittern is the saturated condition, and the barrier forms the tight sodium chloride crystal structure to prevent the seepage, compare with black mud sandwich prevention of seepage, the prevention effect is the same even more excellent, takes the saltpan tail salt nearby moreover, does not need the long-distance transport, and is with low costs, convenient to use.
As shown in fig. 2, fig. 2 is a method for constructing the leakage prevention structure of the old brine salt pan shown in fig. 1.
The construction method of the anti-seepage structure of the old brine salt pan comprises the following steps:
step S1, dam building:
a foundation dam body 1 is constructed around an old brine salt pan containing old brine at least comprising sodium chloride and magnesium chloride in a saturated state.
The construction method of the foundation dam body 1 is the prior art, and only the foundation dam body needs to be constructed around the old brine salt field, and various methods for constructing the dam are applicable, and are not described herein again. In this embodiment, the cross section of the foundation dam 1 is trapezoidal, and the top width of the foundation dam 1 is 8 meters, the bottom width is 14 meters, and the height is 3.5 meters.
Further, the old bittern at least comprises 33.5-36 wt% of magnesium chloride and 0.3-1.0 wt% of sodium chloride, and of course, the old bittern may also contain a small amount of trace substances such as potassium, calcium, boron, bromine, etc. In this example, the old bittern comprises 35.4 wt% of magnesium chloride, 0.35 wt% of sodium chloride, and 0.05 wt% of potassium chloride. The old brine in the old brine salt field and the old brine for irrigation are the same substance, and of course, the components can be slightly different, and the old brine can also be different.
Specifically, according to solubility data, the solubility of a substance in water at the same temperature is different, and the dissolution sequence is different, and when the temperature is 10 ℃, the solubility is as follows: sodium chloride 35.8 g/100 g water and magnesium chloride 53.6 g/100 g water, it can be seen that the solubility of magnesium chloride is greater than that of sodium chloride, and sodium chloride is first near saturation and is not dissolved. The old bittern is a multi-element system, the saturated state refers to a system saturated state, and when magnesium chloride in the old bittern reaches the saturated state, a small amount of sodium chloride approaches the saturated state.
Step S2, grooving:
and digging a foundation trench 2 at the inner side close to the foundation dam body 1.
The foundation trench 2 is used for burying the tail salt, the foundation trench 2 is arranged on the inner side of the foundation dam body 1 close to the old brine salt field, and the tail salt in the foundation trench 2 can prevent brine from permeating, so that the closer the foundation trench 2 is to the inner side of the foundation dam body 1, the less the old brine in the old brine salt field is destructive to the whole foundation dam body 1 from the ground.
The height of the foundation trench 2 is greater than that of the foundation dam body 1, specifically, the foundation dam body 1 is constructed upwards with the ground as a reference, and the foundation trench 2 is constructed upwards with a certain depth below the ground as a reference, so that the foundation dam body 1 is protected to a certain extent below the ground, the anti-seepage effect is better, and the material loss in the old brine is reduced.
The cross section of the base groove 2 is rectangular. The rectangular foundation trench is convenient to construct and convenient to bury the tail salt under the influence of construction tools such as excavators, and the foundation trench 2 can be in other shapes. In the present embodiment, the foundation trench 2 is 4 meters deep and 1 meter wide.
Step S3, filling tail salt:
and filling the tail salt in the base groove 2 and tamping to form the impermeable layer.
The tail salt at least comprises granular sodium chloride, old brine is poured into the impermeable layer, the old brine at least comprises the sodium chloride and magnesium chloride in a saturated state, and part of the granular sodium chloride in the impermeable layer is dissolved into the old brine, so that the sodium chloride in the old brine is in the saturated state, and a compact sodium chloride crystal structure is formed in the impermeable layer.
And partial granular sodium chloride in the impermeable layer is dissolved into the old brine, so that the sodium chloride in the old brine is in a saturated state, the sodium chloride is crystallized and separated out, and after continuous dissolution-crystallization-separation, the crystal structure is the same, a compact sodium chloride crystal structure is formed, and leakage is prevented. The old brine is the old brine in the old brine salt field.
Further, the tail salt is tail salt discharged by a direct flotation process and at least comprises 65.23% +/-5% of sodium chloride and 3.64% +/-1% of magnesium chloride in percentage by weight. The tail salt discharged by the direct flotation process mainly contains sodium chloride, and is used for landfill, so that corresponding tail salt treatment devices are reduced, the cost is saved, the environmental pollution is reduced, and a certain anti-seepage effect is ensured.
Furthermore, the tail salt in the foundation trench 2 is buried for multiple times, and old brine is poured after each time of burying and tamping. The old brine soaks the tail salt, so that the magnesium chloride and the sodium chloride are further saturated, the tamping effect is better, the leakage points on the periphery of the base groove 2 can be fully blocked, and the seepage prevention and leakage prevention of the dam are more facilitated.
The height of the tail salt for each landfill is determined according to the size of the old brine salt field, the size of the foundation dam body 1 and the composition of the brine, and in the embodiment, the height is 30-50 cm, namely, the process of tamping and pouring the old brine is carried out once when the tail salt is buried by 30-50 cm. Of course, the height may also be other values.
In this example, the tail salt includes 64.73% by weight of sodium chloride, 4.19% by weight of magnesium chloride, and 1.35% by weight of potassium chloride. The quantity of the landfill tail salt is 5.6 cubic meters (the solid square quantity coefficient is 1.4), the pouring brine quantity is 0.1 cubic meter brine/cubic meter tail salt, the depth of 4 meters is 2 times of backfilling and tamping of the foundation trench, each time backfilling is 0.5 meter, and the tamping is carried out after the corresponding quantity of brine is poured.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim.
Claims (7)
1. The anti-leakage structure of the old bittern salt field is characterized by comprising a foundation dam body (1) constructed around the old bittern salt field, a foundation groove (2) excavated downwards from the top of the foundation dam body (1), and an anti-seepage layer formed by filling tail salt in the foundation groove (2) and tamping, wherein the tail salt at least comprises granular sodium chloride, old bittern is poured in the anti-seepage layer, the old bittern at least comprises sodium chloride and magnesium chloride in a saturated state, and part of granular sodium chloride in the anti-seepage layer is dissolved in the old bittern to form a compact sodium chloride crystal structure on the anti-seepage layer.
2. The old brine salt pan leakage prevention structure according to claim 1, wherein the height of the foundation trench (2) is greater than the height of the foundation dam (1).
3. The old bittern salt field seepage prevention structure according to claim 1, wherein the tail salt in said foundation trench (2) is buried in multiple times, and old bittern is poured after each time of burying and tamping.
4. The old brine salt pan leakage prevention structure according to claim 1, wherein the foundation trench (2) is opened at the inner side of the foundation dam (1) near the old brine salt pan.
5. The old bittern salt pan leakage prevention structure according to claim 1, wherein said base groove (2) is rectangular in cross section.
6. The brine-brine pan leakage-preventing structure as claimed in claim 1, wherein the tail salt is tail salt discharged from a direct flotation process and at least comprises 65.23% ± 5% of sodium chloride and 3.64% ± 1% of magnesium chloride by weight percentage.
7. The brine-brine seepage prevention structure of the old brine salt pan as claimed in any one of claims 1 to 6, wherein the brine comprises at least 33.5-36% by weight of magnesium chloride and 0.3-1.0% by weight of sodium chloride.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754251.4A CN111877262B (en) | 2020-07-30 | 2020-07-30 | Antiseep structure in old bittern salt pan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754251.4A CN111877262B (en) | 2020-07-30 | 2020-07-30 | Antiseep structure in old bittern salt pan |
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| CN111877262A CN111877262A (en) | 2020-11-03 |
| CN111877262B true CN111877262B (en) | 2021-11-16 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562145A (en) * | 2011-12-14 | 2012-07-11 | 中蓝连海设计研究院 | Dry-type cement filling method realized by aid of extracted tail salt of salt deposit |
| CN102745722A (en) * | 2012-07-20 | 2012-10-24 | 中蓝连海设计研究院 | Novel three-proofing salt field and construction method thereof |
| CN103882871A (en) * | 2014-01-26 | 2014-06-25 | 化工部长沙设计研究院 | Rapid construction method for seepage-proof dam of salt pan |
| CN108569709A (en) * | 2018-07-27 | 2018-09-25 | 茫崖兴元钾肥有限责任公司 | A kind of novel isolation salt pan building method |
| CN110747908A (en) * | 2019-10-24 | 2020-02-04 | 中盐工程技术研究院有限公司 | Anti-seepage system combining anti-seepage membrane and salt pond plate and construction method and application thereof |
| CN110778919A (en) * | 2019-10-28 | 2020-02-11 | 青海盐湖工业股份有限公司 | Protection method and system for salt lake brine conveying pipeline |
-
2020
- 2020-07-30 CN CN202010754251.4A patent/CN111877262B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562145A (en) * | 2011-12-14 | 2012-07-11 | 中蓝连海设计研究院 | Dry-type cement filling method realized by aid of extracted tail salt of salt deposit |
| CN102745722A (en) * | 2012-07-20 | 2012-10-24 | 中蓝连海设计研究院 | Novel three-proofing salt field and construction method thereof |
| CN103882871A (en) * | 2014-01-26 | 2014-06-25 | 化工部长沙设计研究院 | Rapid construction method for seepage-proof dam of salt pan |
| CN108569709A (en) * | 2018-07-27 | 2018-09-25 | 茫崖兴元钾肥有限责任公司 | A kind of novel isolation salt pan building method |
| CN110747908A (en) * | 2019-10-24 | 2020-02-04 | 中盐工程技术研究院有限公司 | Anti-seepage system combining anti-seepage membrane and salt pond plate and construction method and application thereof |
| CN110778919A (en) * | 2019-10-28 | 2020-02-11 | 青海盐湖工业股份有限公司 | Protection method and system for salt lake brine conveying pipeline |
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| CN111877262A (en) | 2020-11-03 |
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