CN112593531B - Construction method of high-ductility wall-building protection underground reservoir artificial dam body structure - Google Patents
Construction method of high-ductility wall-building protection underground reservoir artificial dam body structure Download PDFInfo
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- CN112593531B CN112593531B CN202011476799.3A CN202011476799A CN112593531B CN 112593531 B CN112593531 B CN 112593531B CN 202011476799 A CN202011476799 A CN 202011476799A CN 112593531 B CN112593531 B CN 112593531B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
Abstract
The invention relates to a high-ductility wall-building protection underground reservoir artificial dam body structure and a construction method thereof.A protection block is respectively built on the inner side and the outer side of a dam body to form two protection walls, the protection block is prepared by high-ductility cement mortar, the protection block is of a hollow structure, vertical steel bars and in-wall tie bars are respectively arranged in the hollow of the two protection walls in the longitudinal direction and the transverse direction and are filled with the high-ductility cement mortar, and the two protection walls are connected by hooking the vertical steel bars on the same layer in the two protection walls through the inter-wall tie bars; and pouring concrete between the two protective walls to form a concrete interlayer, thereby forming an artificial dam body structure. The invention reduces the construction difficulty in the narrow passage of the coal mine, simplifies the complex construction process of the impervious layer of the traditional artificial dam, solves the synchronous construction problem of two different materials of the impervious wall and the common concrete, and plays the roles of resisting seepage, reinforcing, coordinating deformation and improving the durability of the dam body.
Description
Technical Field
The invention relates to a high-ductility wall-building protection underground reservoir artificial dam body structure and a construction method thereof, belonging to the field of civil engineering materials and underground engineering structures.
Background
At present, China still serves as a country with large coal consumption, and annual coal mining amount exceeds 30 hundred million tons. China's coal resources are mainly concentrated in arid and semi-arid regions in the west, but the ecological environment of the surface of the west is relatively fragile, and the problems of surface subsidence caused by coal mining and the like seriously damage the ecology, so that a large amount of water resources are lost, and the recovery cost is huge. The harmonious symbiosis problem of water resource protection and coal mining has become a key point of attention in the field. The coal mine underground reservoir is a new measure for solving the problem of water resource loss in the coal mining process, and stores water through gaps formed after coal mining, connects safe coal pillars by using artificial dams to form closed reservoir dams, and is assisted with water delivery facilities to meet the requirements of production and domestic water in mining areas.
The water storage capacity of the coal mine underground reservoir is large, and the artificial dam body faces the coupling effect of huge lateral water pressure, broken stone lateral pressure and top rock stratum vertical pressure. In addition, the western coal mine underground water contains a large amount of aggressive ions (such as sulfate ions, chloride ions and the like), and the severe environmental and load factors cause a series of durability problems such as cracking, leakage and the like of the artificial dam body structure inevitably due to the dry-wet cycle caused by the periodic change of the reservoir water level. After the artificial dam body is corroded, the concrete protective layer is cracked and even peeled off, and harmful ions enter the concrete to accelerate the corrosion of the reinforcing steel bars, so that the service life of the structure is further shortened.
The brittle cracked root of the concrete is derived from the strain softening property of the material, so that the problem to be solved at present is how to find a novel material to replace the existing concrete, improve the impermeability of a dam body and ensure the long-term stability and durability of an underground reservoir.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a high-ductility wall-building protection underground reservoir artificial dam body structure and a construction method thereof.
The purpose of the invention is realized as follows:
a high-ductility wall-built protection underground reservoir artificial dam body structure is characterized in that protection building blocks are built on the inner side and the outer side of a dam body respectively to form two protection walls, the protection building blocks are prepared by high-ductility cement mortar, the protection building blocks are of hollow structures, vertical steel bars and in-wall tie bars are longitudinally and transversely arranged in the hollow structures of the two protection walls respectively and are filled with the high-ductility cement mortar, and the vertical steel bars on the same layer in the two protection walls are hooked between the two protection walls through the inter-wall tie bars to be connected; and pouring concrete between the two protective walls to form a concrete interlayer, thereby forming an artificial dam body structure.
Furthermore, the protective building blocks are earth-shaped blocks with ribs, and form stiffening ribs for the wall body after the protective building blocks are built, so that the lateral stiffness of the protective wall is improved, and meanwhile, the connection performance between the protective wall and concrete is enhanced.
Furthermore, set up outside U type breach and inside U type breach on the horizontal rib of protection building block and the vertical rib respectively, outside U type breach is used for imbedding the interior drawknot muscle of fixed wall, inside U type breach is used for imbedding the drawknot muscle between the fixed wall.
Furthermore, the depth of the external U-shaped notch is not less than 1.5 times of the diameter of the tie bar in the wall and not more than one third of the height of the building block, and the width of the external U-shaped notch is slightly larger than the diameter of the tie bar in the wall; the depth of the internal U-shaped notch is not less than 2.5 times of the diameter of the tie bar between walls and not more than one third of the height of the building block, and the width of the internal U-shaped notch is slightly larger than the diameter of the tie bar between walls.
Furthermore, the tie bars between the walls and the tie bars in the walls are arranged at intervals of two layers of protective building blocks so as to enhance the stability of the wall body of the masonry protective wall. And the high-ductility cement mortar is matched to form an internal constructional column, so that the mechanical property of the protective wall is improved.
Furthermore, a concrete pumping hole is reserved in the center of the top of the protective wall, concrete overflow holes are reserved in two vertex angles, and the concrete continuously flows out of the overflow holes in a full manner to serve as a judgment standard for pouring completion.
Further, the width of the protection building block is 140-160 mm, the height is 140-160 mm, the length is 250-260 mm, the rib width is 40-60 mm, and the flange thickness is 20-30 mm.
Furthermore, the protective building block and the high-ductility cement mortar are both made of high-ductility cement-based composite materials with the same label, the raw materials comprise cement, fly ash, slag, silica fume, an expanding agent, quartz sand, fiber, water and a water reducing agent, and the cement is ordinary portland cement or fast-hardening sulphoaluminate cement; the fiber is polyvinyl alcohol fiber or polyethylene fiber, or the two fibers are mixed; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent. The raw materials are stirred according to a certain proportion, the mixture should not be agglomerated by fibers so as to ensure the construction quality of masonry and filling operation, the material strength is not lower than C30, and the ultimate tensile strain is not lower than 2.0%.
Another aspect of the invention:
a construction method of an artificial dam body structure of a high-ductility wall building protection underground reservoir comprises the following steps:
and 3, when the outer side protective wall is built to be 0.2-0.4m away from the top rock stratum, reserving a concrete pumping hole in the center of the top of the protective wall, reserving concrete overflow holes at two vertex angles, pumping concrete through the pumping hole after the protective wall is built and set on the top, judging that the whole concrete interlayer is completely filled when the concrete continuously flows out from the two overflow holes, and immediately plugging the pumping hole and the overflow holes by rubber plugs.
Further, the masonry mortar is made of a high-ductility cement-based composite material, the raw materials comprise cement, fly ash, slag, silica fume, an expanding agent, quartz sand, fiber, water and a water reducing agent, and the cement is ordinary portland cement or quick-hardening sulphoaluminate cement; the fiber is polyvinyl alcohol fiber or polyethylene fiber, or the two fibers are mixed; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, the thickness of masonry mortar is 10-15 mm, the protection building blocks are full of mortar, and the water reducing agent does not have defects such as holes and gaps. The masonry mortar and the high-ductility cement mortar have synergistic effect, so that the defect of a protective building block gap is overcome, and the anti-permeability effect is ensured.
The invention has the advantages and beneficial effects that:
1) according to the invention, the high-ductility fiber reinforced cement-based composite material (ECC) is applied to the construction of the artificial dam body of the underground reservoir for the first time, the ECC is a novel civil engineering material capable of overcoming the properties of concrete cracking and strain softening, has the characteristic of tensile strain hardening, the macroscopic limit tensile strain can reach more than 3%, the width of each microcrack formed in the tensile process can be controlled within 100 micrometers, and the permeability of the material is obviously reduced. In addition, the ECC material has a self-healing function, the crack width is further reduced or even closed along with the service time extension, and the problem of cracking and leakage of the dam body material is solved;
2) the protective wall is built by adopting high-ductility protective building blocks, so that the construction difficulty in a narrow passage of a coal mine is reduced, the complicated construction process of an impervious layer of the traditional artificial dam is simplified, and the synchronous construction problem of two different materials of the impervious wall and common concrete is solved;
3) the high-ductility protective masonry wall replaces the existing steel formwork, can be used as a permanent formwork, reduces the formwork cost, can enhance the connection performance between the protective wall and concrete by the wall stiffening rib, prevents the protective wall from delaminating, ensures that the artificial dam structure has a reliable protective layer, and can improve the overall stability of the protective wall by the concrete poured between the two protective walls and the tie bars arranged in the wall and between the walls;
4) the high-ductility cement-based composite material is applied to an artificial dam coating, and microcracks which are not more than 100 mu m reduce the permeability of a dam body structure, so that harmful ions are effectively prevented from invading; the material can realize self-healing of cracks in water, so that the width of the cracks of the cracking protective layer is continuously reduced until the cracks are closed, and the anti-permeability performance of the high-ductility protective wall is fully exerted;
5) the high-ductility wall-building protection underground reservoir artificial dam body structure has outstanding safety stability, durability and economy in the whole life cycle.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a structural diagram of an artificial dam body structure of the high-ductility wall building protection underground reservoir;
FIG. 2 is a top view of the high-ductility masonry underground reservoir artificial dam structure of the present invention;
FIG. 3 is a three-dimensional structure of the protective wall according to the present invention;
fig. 4 is a three-dimensional structural view of reinforcing bars in the protective blocks of the present invention.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, the embodiment provides a high-ductility wall-building protection underground reservoir artificial dam body structure, after the undercutting and coal pillar bolting work of coal pillars 1 and upper and lower rock strata 2 on two sides is completed, a prefabricated high-ductility protection building block 4 is built by building mortar 8 clinging to the edge of the undercut on one side of the reservoir to form a protection wall 3. Vertical steel bars 11 and in-wall tie bars 10 are respectively arranged in the hollow core formed by the protective blocks 4 in the longitudinal direction and the transverse direction, and high-ductility cement mortar 6 is poured into the hollow core of the protective blocks when the height of about 1m is built until the protective wall 3 on one side close to the reservoir is finished (as shown in figure 3). And when the protective wall 3 on the outer side of the reservoir is built by about 1m, pouring a concrete interlayer 5 with corresponding height after curing for 1d, and vibrating and compacting. When the distance between the concrete and the top rock stratum is built to be 0.2-0.4m, a concrete pumping hole 12 is reserved in the center of the top of the protective wall, overflow holes 13 are reserved at two vertex angles, and when the concrete continuously flows out from the two overflow holes 13 fully, it can be judged that the concrete has fully filled the whole interlayer. And an inter-wall tie bar 9 is also arranged between the two protective walls to enhance the stability of the wall body. The high-ductility protective building blocks 4 are earth-shaped ribbed building blocks, and form wall stiffening ribs 7 after being built, so that the connection performance between the protective wall 3 and the concrete interlayer 5 is obviously enhanced (as shown in figure 2), and the protective layer is effectively prevented from falling off.
The construction method of the high-ductility wall-building protection underground reservoir artificial dam body structure comprises the following steps:
and 3, when the outer side protective wall is built to be 0.2-0.4m away from the top rock stratum, reserving a concrete pumping hole 12 in the center of the top of the protective wall, reserving concrete overflow holes 13 at two vertex angles, pumping the concrete through the pumping hole after the protective wall is built and set on the top, judging that the whole concrete interlayer is completely filled when the concrete continuously flows out from the two overflow holes, and immediately plugging the pumping hole 12 and the overflow hole 13 by rubber plugs.
Example two:
the embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment on a high-ductility cement-based composite material, the protective block, the high-ductility cement mortar and the masonry mortar of the embodiment are all made of the high-ductility cement-based composite material with the same reference number, and the mass percentage ranges of the components are as follows:
35 to 42 percent of ordinary Portland cement, 11 to 13 percent of fly ash, 2.7 to 3.3 percent of silica fume, 5.4 to 6.6 percent of expanding agent, 16 to 20 percent of quartz sand, 18.5 to 22.5 percent of water, 0.8 to 1.2 percent of polyvinyl alcohol fiber and 0.2 to 0.7 percent of high-efficiency polycarboxylic acid water reducing agent.
The strength of the material is C40, and the ultimate tensile strain is not less than 2.0%. The strength grade used for the concrete sandwich 5 was C40.
The 28-day mechanical parameters of the high ductility cement-based composite used in this example are as follows:
example three:
the present embodiment is a modification of the above embodiment, and is a refinement of the above embodiment with respect to the structure of the protection block 4. As shown in fig. 4, the protective blocks 4 in this embodiment are in the shape of "earth", and the uppermost ends of the "earth" form the wall stiffeners 7 after the building, so that the connection performance between the high-ductility protective wall 3 and the common concrete sandwich 5 (as shown in fig. 2) can be significantly enhanced, and the delamination of the protective layer can be effectively prevented. The clear width of the brick is 150mm, the height of the brick is 150mm, the length of the brick is 250mm, the rib width of the brick is 50mm, the thickness of the flange of the brick is 25mm, and the weight of the brick is about 7.5 kg. The protective building blocks 4 can be prefabricated in factories, and can also be cast, molded and maintained nearby a coal mine.
The wall tie bars 9, the wall internal tie bars 10 and the vertical steel bars 11 are uniformly HRB335 with the diameter of 10 mm. The total height of the whole artificial dam is 3.2m, the total width is 3.9m, the thickness is 1.3m, wherein the net thickness of the protective wall 3 is 0.15m, and the thickness of the concrete interlayer is 1 m. The inter-wall tie bars 9 and the in-wall tie bars 10 of the protective wall 3 are arranged along the vertical direction at intervals of two layers of protective building blocks. Considering that the masonry mortar 8 is a weak part of the protective wall 3, a form that an embedded steel bar notch is reserved in the protective building block 4 is adopted. As shown in fig. 4, the transverse ribs and the longitudinal ribs of the protection blocks 4 are respectively provided with an external U-shaped notch 14 and an internal U-shaped notch 15, the tie bars 10 in the wall are embedded into the internal U-shaped notches 15 of the protection blocks, and the tie bars 9 between the walls are S-shaped and pass through the external U-shaped notches 14 and hook the vertical steel bars 11 (as shown in fig. 4) in the two protection walls 3, so as to enhance the stability of the walls. The U-shaped breach width is reserved to the building block and is uniformly got 15mm, and the 14 degree of depth of outside U-shaped breach is about 20mm (2 times of reinforcing bar diameter 10 mm), and the 15 degree of depth of inside U-shaped breach is about 30mm (3 times of reinforcing bar diameter 10 mm).
This high ductility masonry wall protection underground reservoir concrete artificial dam body structure's cladding adopts the high ductility cement-based material of C40 intensity level, and higher intensity level often accompanies higher compactedness, and high ductility material can control the crack width within 100 mu m in addition, and the self-healing performance of material in aqueous has further reduced the crack width of fracture inoxidizing coating again, above all be of value to the impermeability of reinforcing artificial dam body structure. The good impermeability can also play a role in blocking corrosive ions in the stored water and preventing harmful ions from invading the interior of concrete to cause the corrosion of reinforcing steel bars, thereby improving the durability of the artificial dam.
Finally, it should be noted that the above description is only used as a preferred embodiment of the present invention for protecting the artificial dam structure of the underground reservoir by using the high-ductility cement-based material, and several modifications made on the high-ductility cement-based material, the protection blocks, the protection wall, the reinforcement form, the construction method, etc. are within the protection scope of the present invention.
Claims (8)
1. A construction method of a high-ductility wall-built protection underground reservoir artificial dam body structure is characterized in that protection building blocks (4) are built on the inner side and the outer side of a dam body respectively to form two protection walls (3), the protection building blocks are prepared from high-ductility cement mortar (6), the protection building blocks are of hollow structures, vertical steel bars (11) and in-wall tie bars (10) are longitudinally and transversely arranged in the hollow of the two protection walls respectively, the protection walls are filled with the high-ductility cement mortar, and the two protection walls are connected by hooking vertical steel bars on the same layer in the two protection walls through inter-wall tie bars (9); concrete is poured between the two protective walls to form a concrete interlayer (5), so that an artificial dam body structure is formed;
the tie bars (9) between the walls and the tie bars (10) in the walls are arranged at intervals of two layers of protective building blocks;
the construction method comprises the following steps:
step 1, after the working of slotting and coal column anchor rod supporting of coal columns (1) and upper and lower rock stratums (2) on two sides is completed, building prefabricated protective blocks (4) by building mortar (8) on one side of a reservoir in a manner of clinging to the edges of the slotting, arranging vertical reinforcing steel bars (11) in hollow cores formed by the protective blocks, arranging one in-wall tie bar (10) and one between-wall tie bar (9) every two layers of protective blocks, and pouring high-ductility cement mortar (6) into the hollow cores formed by the protective blocks until the protective wall (3) close to one side of the reservoir is finished when building 1-2 m in height;
step 2, building an outer side protective wall (3) on the other side by the same method of the step 1, pouring a concrete interlayer (5) with a corresponding height after curing and vibrating to compact each building for 1-2 m;
and 3, when the outer side protective wall is built to be 0.2-0.4m away from the top rock stratum, reserving a concrete pumping hole (12) in the center of the top of the protective wall, reserving concrete overflow holes (13) at two vertex angles, pumping concrete through the pumping hole after the protective wall is built and set, judging that the whole concrete interlayer is completely filled when the concrete continuously flows out from the two overflow holes, and immediately plugging the pumping hole and the overflow hole by using a rubber plug.
2. The method for building the artificial dam body structure of the high-ductility wall-building underground reservoir according to the claim 1, characterized in that the protection blocks (4) are earth-shaped ribbed blocks, and the wall stiffening ribs (7) are formed after the building.
3. The method for constructing the artificial dam body structure of the high-ductility masonry wall protective underground reservoir according to the claim 2, characterized in that the transverse ribs and the longitudinal ribs of the protective blocks (4) are respectively provided with outer U-shaped notches (14) and inner U-shaped notches (15), the outer U-shaped notches are used for embedding the tie bars (10) in the fixed walls, and the inner U-shaped notches are used for embedding the tie bars (9) between the fixed walls.
4. The method for constructing the artificial dam body structure of the high-ductility masonry wall protective underground reservoir according to the claim 3, characterized in that the depth of the external U-shaped notch (14) is not less than 1.5 times the diameter of the tie bar in the wall and not more than one third of the height of the block, and the width is larger than the diameter of the tie bar in the wall; the depth of the internal U-shaped notch (15) is not less than 2.5 times of the diameter of the tie bar between walls and not more than one third of the height of the building block, and the width is larger than the diameter of the tie bar between walls.
5. The method for constructing the artificial dam body structure of the high-ductility bricklaying wall protection underground reservoir as claimed in claim 1, wherein a concrete pumping hole (12) is reserved in the center of the top of the protection wall, and concrete overflow holes (13) are reserved at two top corners.
6. The construction method of the high-ductility masonry wall protection underground reservoir artificial dam body structure according to claim 1, characterized in that the width of the protection building block (4) is 150-200 mm, the height is 150-200 mm, the length is 250-300 mm, the rib width is 40-60 mm, and the flange thickness is 20-30 mm.
7. The construction method of the high-ductility masonry wall protection underground reservoir artificial dam body structure according to the claim 1, characterized in that the protection building blocks (4) and the high-ductility cement mortar (6) are made of high-ductility cement-based composite materials, the raw materials comprise cement, fly ash, slag, silica fume, an expanding agent, quartz sand, fiber, water and a water reducing agent, and the cement is ordinary portland cement or fast-hardening sulphoaluminate cement; the fiber is polyvinyl alcohol fiber or polyethylene fiber, or the two fibers are mixed; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
8. The method for building the high-ductility masonry wall protective underground reservoir artificial dam body structure according to the claim 1, characterized in that the masonry mortar (8) is made of high-ductility cement-based composite materials, the raw materials comprise cement, fly ash, slag, silica fume, expanding agent, quartz sand, fiber, water and water reducing agent, and the cement is ordinary portland cement or fast hardening sulphoaluminate cement; the fiber is polyvinyl alcohol fiber or polyethylene fiber, or the two fibers are mixed; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, and the thickness of the masonry mortar is 10-15 mm.
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