CN111622180A - Salt pan dam foundation seepage-proof hydraulic balance structure system and control method thereof - Google Patents

Salt pan dam foundation seepage-proof hydraulic balance structure system and control method thereof Download PDF

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Publication number
CN111622180A
CN111622180A CN202010469352.7A CN202010469352A CN111622180A CN 111622180 A CN111622180 A CN 111622180A CN 202010469352 A CN202010469352 A CN 202010469352A CN 111622180 A CN111622180 A CN 111622180A
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CN
China
Prior art keywords
seepage
proofing
dam
water
hydraulic balance
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Pending
Application number
CN202010469352.7A
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Chinese (zh)
Inventor
陈安重
潘江洋
颜辉
李永丰
胡大可
王少华
袁爱民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Zhongnan Water Power Hydraulic Engineering Construction Co ltd
PowerChina Zhongnan Engineering Corp Ltd
Original Assignee
Hunan Zhongnan Water Power Hydraulic Engineering Construction Co ltd
PowerChina Zhongnan Engineering Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hunan Zhongnan Water Power Hydraulic Engineering Construction Co ltd, PowerChina Zhongnan Engineering Corp Ltd filed Critical Hunan Zhongnan Water Power Hydraulic Engineering Construction Co ltd
Priority to CN202010469352.7A priority Critical patent/CN111622180A/en
Publication of CN111622180A publication Critical patent/CN111622180A/en
Pending legal-status Critical Current

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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/40—Foundations for dams across valleys or for dam constructions
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/004—Sealing liners

Abstract

The invention discloses a salt pan dam foundation seepage-proofing hydraulic balance structure system and a control method thereof. The salt pan dam foundation seepage-proofing hydraulic balance structure system comprises an inner seepage-proofing body, an outer seepage-proofing body and a water seal curtain; the water seal curtain is a saturated zone formed after water injection is controlled in real time between the inner seepage-proofing body and the outer seepage-proofing body; the inner seepage-proofing body and the outer seepage-proofing body are fully-closed seepage-proofing bodies built in the dam and arranged along the length direction of the dam, and a medium water-permeable body with a certain thickness is reserved between the inner seepage-proofing body and the outer seepage-proofing body; the bottom ends of the inner seepage-proofing body and the outer seepage-proofing body extend into the relative impervious layer. The seepage-proofing system of the invention solves the technical requirement of high-standard seepage-proofing of the salt-field reservoir dam foundation, thereby reducing the brine seepage of the salt field.

Description

Salt pan dam foundation seepage-proof hydraulic balance structure system and control method thereof
Technical Field
The invention relates to a salt pan dam foundation anti-seepage hydraulic balance structure system and a control method thereof, belonging to the field of high-standard anti-seepage of salt pan dam foundations.
Background
The salt field is the main facility for sea salt production, the seepage-proofing performance of the salt field reservoir basin directly relates to brine-making and salt-producing efficiency, and the seepage-proofing performance of the salt field reservoir basin can comprise the seepage-proofing of the bottom surface of the reservoir basin and the seepage-proofing of the foundation of a reservoir dam.
At present, the seepage-proofing technology of the bottom surface of a basin of a salt field reservoir is mature day by day, the seepage-proofing technology of a reservoir dam foundation is continuously the conventional seepage-proofing technologies such as seepage-proofing paving, a clay core wall, a seepage-proofing curtain and the like, and the seepage-proofing effect of the conventional seepage-proofing technologies cannot meet the high-standard seepage-proofing technical requirement of the salt field reservoir dam foundation.
Relevant data statistics shows that the brine leakage rate of the salt pan in China reaches more than 50%, wherein the base leakage rate of the reservoir dam exceeds the total leakage rate of the salt pan in the salt pan by 60%.
In a word, the existing conventional dam foundation seepage-proofing structural system is a seepage structural system in theory or engineering practice, and only the water permeability or seepage-proofing standard is different.
Disclosure of Invention
The invention aims to provide a brand-new salt pan dam foundation seepage-proofing hydraulic balance structure system and a control method thereof, which aim to meet the technical requirement of high-standard seepage-proofing of a salt pan reservoir dam foundation and further reduce salt pan brine seepage.
In order to achieve the purpose, the invention adopts the technical scheme that:
an anti-seepage hydraulic balance structure system of a salt pan dam foundation comprises an inner anti-seepage body, an outer anti-seepage body and a water seal curtain; the water seal curtain is a saturated zone formed after water injection is controlled in real time between the inner seepage-proofing body and the outer seepage-proofing body;
the inner seepage-proofing body and the outer seepage-proofing body are fully-closed seepage-proofing bodies built in the dam and arranged along the length direction of the dam, and a medium water-permeable body with a certain thickness is reserved between the inner seepage-proofing body and the outer seepage-proofing body;
the bottom ends of the inner seepage-proofing body and the outer seepage-proofing body extend into the relative impervious layer.
Therefore, the water sealing curtain is formed after water injection is controlled between the inner seepage-proofing body and the outer seepage-proofing body in real time, and the seepage-proofing capability of the foundation of the salt field reservoir dam is effectively improved by depending on the hydraulic balance relation between the liquid of the water sealing curtain and the liquid in the dam.
According to the embodiment of the invention, the invention can be further optimized, and the following is the technical scheme formed after optimization:
in one of the preferred embodiments, the dikes are divided into a main dike on the upstream side and a sub dike on the downstream side; the inner seepage-proofing body is built in the main dam, and the outer seepage-proofing body is built in the auxiliary dam. A medium water permeable body with a certain thickness is reserved between the inner seepage-proofing body and the outer seepage-proofing body, and the water seal curtain is built in the medium water permeable body between the main dam and the auxiliary dam. The structural principle of the invention is mainly explained according to a three-seepage-proofing body structure arranged in a dam body, and the main dam structure and the auxiliary dam structure are just a special case under the allowable conditions of site conditions and economic conditions. Meanwhile, whether the heights of the tops of the dams are equal or not is not important, and the balance between the water pressure of the middle water seal curtain and the water pressure of liquid in the dams can be mainly ensured.
In order to further reduce the leakage of brine in the salt pan, the bottom ends of the inner impervious body and the outer impervious body extend into the opposite impervious layer to a depth of at least 1 m.
It is worth explaining that whether the loss of the brine of the salt field is reduced or not mainly depends on the balance relationship between the water injection sealing curtain in the structural system and the hydraulic pressure in the dam. The penetration of the inner and outer barriers into the lower relatively impermeable layer is only a basic requirement for building a conventional barrier structure, is not a critical requirement for reducing the water seepage amount, and is only a preferred scheme, for example, the bottom ends of the inner and outer barriers are extended into the relatively impermeable layer to a depth of 1m-1.5m, which is a preferred scheme.
Preferably, the water-sealed curtain satisfies the following relationship:
hinner part×γInner part= hScreen×γScreen
Wherein, the liquid level elevation, gamma, in the dam is in hInner partIs the specific gravity of the liquid in the dam hScreenFor water-sealed curtain liquid level elevation, gammaScreenIs the specific gravity of water injection liquid.
In order to conveniently and quickly form the water-sealed curtain, a water injection hole pipe built in the dam is arranged between the inner seepage-proofing body and the outer seepage-proofing body.
Preferably, the intermediate water-permeable body has a thickness of at least 0.5m, preferably 0.5m to 1.5 m. The aforementioned thickness direction means a direction perpendicular to the axis of the dam.
Preferably, the inner impervious body is an impervious blanket or impervious wall or impervious curtain body, and/or the outer impervious body is an impervious wall or impervious curtain body. The inner seepage-proofing body is used for assisting in improving the seepage-proofing capability of the seepage-proofing structure system, and meanwhile, the liquid in the dam and the water-sealing curtain are isolated, so that the dilution and diffusion of important components of the liquid in the dam into the water-sealing curtain are reduced. The outer seepage-proofing body is used for assisting in improving the seepage-proofing capability of the seepage-proofing structure system, preventing liquid of the water-sealing curtain from leaking outside the dam, and reducing the regulation and control water injection amount of the water-sealing curtain.
In order to ensure the effect of the water-sealed curtain, the top elevations of the inner seepage-proof body and the outer seepage-proof body are respectively higher than the liquid level elevation h of the water-sealed curtainScreenThe height is at least 0.3m, preferably 0.3m to 0.5 m.
In order to quickly form the water seal curtain, the distance between two adjacent holes of the water injection hole pipe is 1.0m-5.0m, and the depth of the bottom end of the water injection hole pipe extending into the dam base part relative to the impermeable layer is at least 0.5m, preferably 0.5m-1.0 m.
Based on the same invention concept, the invention also provides a control method of the salt pan dam foundation seepage-proof hydraulic balance structure system, water is injected into the water seal curtain until h is keptInner part×γInner part= hScreen×γScreenWherein h isInner partIs the liquid level elevation, gamma, in the damInner partIs the specific gravity of the liquid in the dam hScreenFor water-sealed curtain liquid level elevation, gammaScreenIs the specific gravity of water injection liquid.
Preferably, the water is injected into the water seal curtain to be the wastewater pumped and discharged in the salt pan.
Compared with the prior art, the invention has the beneficial effects that:
the seepage-proof hydraulic balance structural system of the saline land dam foundation basically realizes zero seepage of liquid in the dam to the outside of the dam, thereby greatly improving the seepage-proof standard of the dam foundation and providing a brand-new seepage-proof structural system for the zero-seepage high-standard seepage-proof engineering of the dam foundation.
Drawings
FIG. 1 is a schematic structural diagram (an end view perpendicular to the length direction of a dam foundation) of example 1 of the present invention;
FIG. 2 is a schematic diagram of the structure of example 2 of the present invention (an end view perpendicular to the length direction of the dam foundation).
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
Example 1
A salt field dam foundation seepage-proofing hydraulic balance structure system is shown in figure 1 and comprises an inner seepage-proofing body 2, a water injection hole pipe 4, a water seal curtain 5 and an outer seepage-proofing body 3 which are arranged in a dam 1, wherein the water injection hole pipe 4 is used for regulating and controlling the liquid level elevation of the water seal curtain 5 in real time to achieve hInner part×γInner part= hScreen×γScreenThe hydraulic balance relation can effectively control the liquid in the dam to leak out of the dam through the dam foundation, and the h isInner partIs the elevation of the liquid level in the dam, said gammaInner partIs the specific gravity of the liquid in the dam, hScreenFor water-sealed curtain 5 liquid level elevation, gammaScreenIs the specific gravity of water injection liquid.
The inner seepage-proofing body 2 and the outer seepage-proofing body 3 are fully sealed seepage-proofing bodies along a dam foundation, and a medium water-permeable body with a certain thickness is reserved between the inner seepage-proofing body 2 and the outer seepage-proofing body 3. And a water injection hole pipe 4 is arranged between the medium water permeable bodies, and water is injected in real time through the water injection hole pipe 4 to form a water-saturated soil body. In the running process of the salt pan, reading real-time data by using a monitoring system according to hScreen=（hInner part×γInner part）/γScreenAnd the hydraulic balance formula is used for automatically regulating and controlling water injection of the water injection hole pipe 4 through a water injection system controlled by a computer.
The inner impervious body 2 is a conventional impervious blanket or impervious wall or impervious curtain body, is used for assisting in improving the impervious capability of the impervious structure system, and meanwhile, isolates the dam liquid from the water seal curtain 5, so that the dilution and diffusion of important components of the dam liquid into the water seal curtain 5 are reduced.
The outer impervious body 3 is also a conventional impervious wall or impervious curtain body, is used for assisting in improving the impervious capability of the impervious structure system, simultaneously prevents liquid of the water-sealed curtain 5 from leaking to the outside of the dam, and reduces the regulation and control water injection amount of the water injection hole pipe 4 to the water-sealed curtain 5.
The top elevation ratio h of the inner impervious body 2 to the outer impervious body 3 is higher than the liquid level elevation h of the water seal curtain 5ScreenThe height is 0.3-0.5m, the depth of the bottom end of the inner and outer impervious bodies 3 penetrating into the bottom of the dam base relative to the impervious layer 6 is 1.0-1.5m, and the permeability coefficient is less than or equal to 10-5cm/s, the impervious strength meets the requirement of dam foundation seepage stability.
The thickness of the medium water-permeable body can be generally 0.5-1.5 m.
The distance between the holes of the water injection hole pipe 4 is 1.0m-5.0m, the depth of the bottom end of the water injection hole pipe 4 extending into the opposite impervious layer 6 at the bottom of the dam base is 0.5-1.0m, the diameter of the water injection hole is more than or equal to 75mm, and a PVC water injection flower pipe matched with the hole diameter is arranged in the hole.
Example 2
A hydraulic pressure balance structure system for preventing seepage of a salt pan dam foundation is disclosed, as shown in figure 2, a dam 1 is divided into a main dam 11 located at an upstream side and a sub dam 12 located at a downstream side. An inner seepage-proofing body 2 is built in the main dam 11, an outer seepage-proofing body 3 is built in the auxiliary dam 12, a medium water-permeable body with a certain thickness is reserved between the inner seepage-proofing body and the outer seepage-proofing body, and the water seal curtain is built in the medium water-permeable body between the main dam and the auxiliary dam.
When the water-sealed curtain works, the water-sealed curtain 5 is injected with water in real time to regulate the liquid level elevation to reach hInner part×γInner part= hScreen×γScreenThe hydraulic balance relation can effectively control the liquid in the dam to leak out of the dam through the dam foundation, and the h isInner partIs the elevation of the liquid level in the dam, said gammaInner partIs the specific gravity of the liquid in the dam, hScreenFor water-sealed curtain 5 liquid level elevation, gammaScreenIs the specific gravity of water injection liquid.
The remaining structural parameters are the same as those in embodiment 1, and are not described again.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.

Claims (10)

1. An anti-seepage hydraulic balance structure system of a salt pan dam foundation is characterized by comprising an inner anti-seepage body (2), an outer anti-seepage body (3) and a water seal curtain (5); the water seal curtain (5) is a saturated zone formed by controlling water injection in real time between the inner impervious body (2) and the outer impervious body (3);
the inner seepage-proofing body (2) and the outer seepage-proofing body (3) are fully-closed seepage-proofing bodies built in the dam (1) and arranged along the length direction of the dam, and a medium water-permeable body with a certain thickness is reserved between the inner seepage-proofing body (2) and the outer seepage-proofing body (3);
the bottom ends of the inner seepage-proofing body (2) and the outer seepage-proofing body (3) extend into the opposite impervious layer (6).
2. The salt pan dam foundation seepage-proofing hydraulic balance structure system according to claim 1, wherein said dike (1) is divided into a main dike (11) at the upstream side and a sub dike (12) at the downstream side; the inner impervious body (2) is built in the main dam (11), and the outer impervious body (3) is built in the auxiliary dam (12).
3. The salt pan dam foundation seepage-proofing hydraulic balance structural system according to claim 1 or 2, wherein the bottom ends of the inner seepage-proofing body (2) and the outer seepage-proofing body (3) extend into the opposite impervious layer (6) to a depth of at least 1 m; preferably 1m to 1.5 m.
4. The salt pan dam foundation seepage-proofing hydraulic balance structural system according to claim 1 or 2, characterized in that the water seal curtain (5) satisfies the following relationship:
hinner part×γInner part= hScreen×γScreen
Wherein h isInner partIs the liquid level elevation, gamma, in the damInner partIs the specific gravity of the liquid in the dam hScreenIs a water-sealed curtain (5) with liquid level elevation, gammaScreenIs the specific gravity of water injection liquid.
5. The salt pan dam foundation seepage-proofing hydraulic balance structural system according to claim 1 or 2, characterized in that a water injection hole pipe (4) built in the dam (1) is arranged between the inner seepage-proofing body (2) and the outer seepage-proofing body (3).
6. The salt pan dam foundation seepage-proofing hydraulic balance structural system according to claim 5, wherein the distance between two adjacent holes of the water injection hole pipe (4) is 1.0m-5.0m, and the depth of the bottom end of the water injection hole pipe (4) extending into the dam foundation relative to the water-impermeable layer (6) is at least 0.5m, preferably 0.5m-1.0 m.
7. The salt pan dam foundation seepage-proofing hydraulic balance structure system according to claim 1 or 2, wherein the thickness of the intermediate water-permeable body is at least 0.5m, preferably 0.5m-1.5 m.
8. Salt pan dam foundation seepage-proofing hydraulic balance structure system according to claim 1 or 2, characterized in that the inner seepage-proofing body (2) is an seepage-proofing cover or a seepage-proofing wall or a seepage-proofing curtain body, and/or
The outer impervious body (3) is an impervious wall or an impervious curtain body.
9. The salt pan dam foundation seepage-proofing hydraulic balance structural system according to claim 1 or 2, wherein the top elevations of the inner seepage-proofing body (2) and the outer seepage-proofing body (3) are both higher than the liquid level elevation h of the water seal curtain (5)ScreenThe height is at least 0.3m, preferably 0.3m to 0.5 m.
10. A method for controlling the system of hydraulic balance of salt-field dam foundation according to any of claims 1-9, characterized in that water is injected into the water-sealed curtain (5) until and at the same time hInner part×γInner part= hScreen×γScreenWherein h isInner partIs the liquid level elevation, gamma, in the damInner partIs the specific gravity of the liquid in the dam hScreenIs a water-sealed curtain (5) with liquid level elevation, gammaScreenThe specific gravity of the water injection liquid; preferably, the water-sealed curtain (5) is filled with water to pump and discharge waste water in the salt pan.
CN202010469352.7A 2020-05-28 2020-05-28 Salt pan dam foundation seepage-proof hydraulic balance structure system and control method thereof Pending CN111622180A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1329688A (en) * 1998-12-10 2002-01-02 卡皮泰克意大利有限责任公司 Embankment dam and waterproofing method
JP2012117332A (en) * 2010-12-03 2012-06-21 Mirai Construction Co Ltd Impervious wall structure
CN204370373U (en) * 2014-11-13 2015-06-03 昆明理工大学 Seepage proof curtain structure closed by a kind of reservoir
CN104878723A (en) * 2015-06-01 2015-09-02 南京明辉建设有限公司 Earth-rock mixed dam integral vertical anti-seepage structure and construction method
CN106522170A (en) * 2015-09-11 2017-03-22 梁军 Novel dam type adopting concrete anti-seepage wall as dam body anti-seepage body
CN110424435A (en) * 2019-08-27 2019-11-08 中水北方勘测设计研究有限责任公司 For the cut-pff wall in deep covering layer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1329688A (en) * 1998-12-10 2002-01-02 卡皮泰克意大利有限责任公司 Embankment dam and waterproofing method
JP2012117332A (en) * 2010-12-03 2012-06-21 Mirai Construction Co Ltd Impervious wall structure
CN204370373U (en) * 2014-11-13 2015-06-03 昆明理工大学 Seepage proof curtain structure closed by a kind of reservoir
CN104878723A (en) * 2015-06-01 2015-09-02 南京明辉建设有限公司 Earth-rock mixed dam integral vertical anti-seepage structure and construction method
CN106522170A (en) * 2015-09-11 2017-03-22 梁军 Novel dam type adopting concrete anti-seepage wall as dam body anti-seepage body
CN110424435A (en) * 2019-08-27 2019-11-08 中水北方勘测设计研究有限责任公司 For the cut-pff wall in deep covering layer

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