CN114411618A - Damaged river channel matrix repairing method - Google Patents
Damaged river channel matrix repairing method Download PDFInfo
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- CN114411618A CN114411618A CN202210128979.5A CN202210128979A CN114411618A CN 114411618 A CN114411618 A CN 114411618A CN 202210128979 A CN202210128979 A CN 202210128979A CN 114411618 A CN114411618 A CN 114411618A
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- bentonite
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- 239000011159 matrix material Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 18
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 14
- 239000000440 bentonite Substances 0.000 claims abstract description 14
- 238000009825 accumulation Methods 0.000 claims abstract description 9
- 238000007605 air drying Methods 0.000 claims abstract description 9
- 230000036571 hydration Effects 0.000 claims abstract description 9
- 238000006703 hydration reaction Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 230000008439 repair process Effects 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims description 29
- 238000004140 cleaning Methods 0.000 claims description 20
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 18
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 18
- 229940080314 sodium bentonite Drugs 0.000 claims description 18
- 229940092782 bentonite Drugs 0.000 claims description 13
- 239000002344 surface layer Substances 0.000 claims description 12
- 241000196324 Embryophyta Species 0.000 claims description 10
- 229910000281 calcium bentonite Inorganic materials 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 238000009412 basement excavation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011049 filling Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000000638 solvent extraction Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011020 pilot scale process Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
-
- 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
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
-
- 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
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/128—Coherent linings made on the spot, e.g. cast in situ, extruded on the spot
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention belongs to the technical field of river channel repair, and particularly relates to a damaged river channel matrix repair method. The invention provides a damaged river channel matrix repairing method, which comprises the following steps of (1) hydration grading: uniformly mixing bentonite and water, standing and grading to obtain an upper suspension and a lower slurry; (2) and (3) closing a thick gap by silting: pouring the slurry to a river channel matrix engineering area to be repaired until water is accumulated and air-dried; (3) fine gap silting: and pouring the suspension into a river channel matrix engineering area with the repaired coarse gap till water accumulation and air drying occur. The invention is a restoration method based on the original matrix, has simple construction, does not need large-scale excavation and filling, and has good ecological effect.
Description
Technical Field
The invention belongs to the technical field of river channel repair, and particularly relates to a damaged river channel matrix repair method.
Background
With the development of economy, the healthy sustainable development of water ecosystem is receiving much attention. For the areas with water resource shortage, the permeability of the permeability-reducing layer at the base of the natural river or lake is damaged due to the influence of artificial disturbance of gravel and the like, the permeability is far greater than the natural condition, the water ecological system with naturally stable surface water is difficult to maintain, and the ecological quality of the area is seriously influenced.
The restoration method in the prior art mostly adopts the means of bentonite waterproof blankets, geomembranes, bentonite interlayers, clay backfill and the like, but has the problems of complex construction, influence on natural ecology by adopting chemical materials, poor anti-scouring performance, high manufacturing cost and the like.
For example, the prior art discloses a natural river bentonite interlayer permeability reducing method, which comprises the following steps of (1) selecting a loam field with uniform local soil quality and no impurities, removing surface miscellaneous soil and plant roots, and taking down the undisturbed loam of the lower layer; (2) cleaning impurities and sludge in the river channel, and excavating to a designed river channel foundation elevation; screening the excavated gravel material and gravel stones for later use; (3) firstly, paving a local loam cushion layer on the excavated and leveled river channel, compacting, leveling the surface and roughening; (4) laying a layer of natural sodium bentonite on a local soil cushion, then laying another layer of local soil above the bentonite, and after laying the two layers, uniformly compacting by vibration to form a bentonite interlayer permeability reducing layer with a natural sodium bentonite permeability reducing layer in the middle and a current soil layer at the upper part and the lower part; (5) backfilling the gravel materials reserved in the step (2) above the permeability reducing layer as a reverse filtering layer, and then backfilling the gravel stones reserved in the step (2) above the gravel material reverse filtering layer as a protective layer; (6) the permeability reducing layer, the reversed filter layer and the protective layer should cover the whole river channel section, the side slope permeability reducing layer should extend to be higher than the designed normal water level by more than 30cm, and the reversed filter layer and the protective layer synchronously extend upwards and completely cover the permeability reducing layer to prevent water from leaking from the side.
However, the restoration method in the prior art needs large-scale excavation and filling, is complex in construction, is easy to destroy the original ecology, and has the problems of high manufacturing cost and poor anti-scouring performance after restoration.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the restoration method in the prior art needs large-scale excavation and filling, is complex in construction, is easy to destroy the original ecology, is high in manufacturing cost and poor in scour resistance after restoration, thereby providing the restoration method for the damaged river channel matrix.
Therefore, the invention provides the following technical scheme,
the invention provides a method for repairing a damaged river channel matrix, which comprises the following steps,
(1) hydration grading: uniformly mixing bentonite and water, standing and grading to obtain an upper suspension and a lower slurry;
(2) and (3) closing a thick gap by silting: pouring the slurry to a river channel matrix engineering area to be repaired until water is accumulated and air-dried;
(3) fine gap silting: and pouring the suspension into a river channel matrix engineering area with the repaired coarse gap till water accumulation and air drying occur.
Optionally, the step (2) is repeated 3-5 times;
and/or, said step (3) is repeated 3-5 times.
Optionally, the air drying time is 1-7 days.
Optionally, in the step (1), the mass ratio of the natural sodium bentonite to the water is 1: (10-15).
Optionally, the standing time in the step (1) is 15-60 min.
Optionally, the bentonite is at least one of natural sodium bentonite, natural calcium bentonite and modified bentonite;
optionally, the sodium bentonite may be nano-scale natural sodium bentonite;
typically, and without limitation, the technical specifications of the nanoscale natural sodium bentonite are shown in the following table:
optionally, the method further comprises the step of cleaning the surface layer of the river channel substrate engineering area to be repaired before the step (1).
Optionally, the cleaning method includes: removing dead branches and fallen leaves and weeds on the ground surface of the river channel matrix engineering area to be repaired and surface soil with the surface layer of 10-30cm, wherein the original trees and shrubs do not need to be removed;
and/or the cleaning range is 30-50cm higher than the daily water level, and a bank is constructed for partitioning;
optionally, the pitch of each partition bank is 10-30m, and the corresponding area is 100-900m2。
Optionally, surface soil backfilling is performed after the step (3).
Optionally, uniformly mixing the residual slurry with surface soil, and paving the mixture on the surface of the river channel matrix engineering area subjected to fine gap siltation restoration;
the surface soil is soil for cleaning the surface layer on site
Optionally, the paving thickness is 10-30 cm.
The technical proposal provided by the invention has the advantages that,
1. the invention provides a damaged river channel matrix repairing method, which comprises the following steps of (1) hydration grading: uniformly mixing bentonite and water, standing and grading to obtain an upper suspension and a lower slurry; (2) and (3) closing a thick gap by silting: pouring the slurry to a river channel matrix engineering area to be repaired until water is accumulated and air-dried; (3) fine gap silting: and pouring the suspension into a river channel matrix engineering area with the repaired coarse gap till water accumulation and air drying occur. The method is an in-situ restoration method based on the original matrix, is simple in construction, does not need large-scale excavation and filling, and has a good ecological effect. The invention can deal with the matrix structure gaps formed by different particle sizes through hydration and grading treatment, and conveys the mineral filler after grading treatment to the inner gaps of the matrix structure. The invention uses the natural silt closing mechanism of the pebble natural river channel matrix gap for reference, aims at the problem that the natural river channel matrix is damaged by artificial disturbance, and gradually silts up and closes the permeable gap in the river channel matrix by an in-situ irrigation and airing alternative perfusion method without large-scale excavation and filling construction. The method does not change the matrix structure of the undisturbed river channel and can maintain the anti-water flow scouring capability of the original river channel. The leakage rate of the river channel matrix can be controlled to be 1-6cm/d through the repairing treatment of the method.
2. The bentonite mineral material is a pure natural material, and has no lasting harm of chemical fiber, artificial synthesis, organic toxicity and the like. Moreover, the bentonite mineral material selected by the invention is beneficial to promoting the silt closure of the fine permeable gaps.
3. The damaged river channel repairing method provided by the invention is used for constructing small banks in a partitioned manner, so that subsequent slurry can be conveniently poured.
4. The damaged river channel repairing method provided by the invention is beneficial to the protection of the original seed bank and promotes the inhabitation and propagation of the original aquatic animals and plants by backfilling the surface soil.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
To facilitate comparison of data, the natural sodium bentonite used in examples 1-5 was provided by the Xin Cheng mineral product manufacturer, 1250 mesh sodium bentonite, the topsoil used was obtained from the test area, the cohesive soil used in comparative example 1 was the building pit spoil, and the gravel material was obtained from the test area upstream of the Yonghe Jingliang road highway bridge.
Example 1
This example provides a method for repairing damaged river channel matrix, comprising the following steps,
1. cleaning the surface layer of the field: and (3) removing sundries such as dead branches, fallen leaves, weeds and the like on the ground surface of the engineering area, and removing undisturbed trees and shrubs without removing the sundries. The cleaning range is 30cm higher than the daily water level elevation. And constructing banks for partitioning (the spacing between banks is 20m, and the corresponding area is 400 m)2，)。
2. Hydration grading: 50kg of natural sodium bentonite is slowly added into 500kg of water, and the natural sodium bentonite is fully stirred and hydrated to be uniformly dispersed. Stirring, standing for 30min to obtain upper suspension and lower slurry.
3. And (3) closing a thick gap by silting: and pouring the slurry into a river channel matrix engineering area to be repaired until water is accumulated, and after pouring, air-drying for 3d, and circulating for 4 times.
4. Fine gap silting: and pouring the suspension into the river channel matrix engineering area with the repaired coarse gap till water accumulation occurs, and airing for 3d after pouring, and circulating for 4 times.
5. Backfilling surface soil: and uniformly mixing the residual slurry and surface soil, and paving the mixture on the surface of the river channel matrix engineering area subjected to fine gap silting repair, wherein the paving thickness is 20 cm.
Example 2
This example provides a method for repairing damaged river channel matrix, comprising the following steps,
1. cleaning the surface layer of the field: and (3) removing sundries such as dead branches, fallen leaves, weeds and the like on the ground surface of the engineering area, and removing undisturbed trees and shrubs without removing the sundries. The cleaning range is 50cm higher than the daily water level. And constructing banks for partitioning (the spacing between banks is 30m, and the corresponding area is 900 m)2，)。
2. Hydration grading: 50kg of natural sodium bentonite is slowly added into 750kg of water, and the mixture is fully stirred and hydrated to be uniformly dispersed. Stirring, standing for 60min to obtain upper suspension and lower slurry.
3. And (3) closing a thick gap by silting: and pouring the slurry into a river channel matrix engineering area to be repaired until water is accumulated, and after pouring, drying for 7d and circulating for 5 times.
4. Fine gap silting: and pouring the suspension into the river channel matrix engineering area with the repaired coarse gap till water accumulation occurs, and airing for 7d after pouring, and circulating for 5 times.
5. Backfilling surface soil: and uniformly mixing the residual slurry and surface soil, and paving the mixture on the surface of the river channel matrix engineering area subjected to fine gap silting repair, wherein the paving thickness is 30 cm.
Example 3
This example provides a method for repairing damaged river channel matrix, comprising the following steps,
1. cleaning the surface layer of the field: and (3) removing sundries such as dead branches, fallen leaves, weeds and the like on the ground surface of the engineering area, and removing undisturbed trees and shrubs without removing the sundries. Cleaning upThe range is 30cm higher than the daily water level. And constructing banks for partitioning (the spacing between banks is 10m, and the corresponding area is 100 m)2)。
2. Hydration grading: 50kg of natural sodium bentonite is slowly added into 500kg of water, and the natural sodium bentonite is fully stirred and hydrated to be uniformly dispersed. Stirring, standing for 15min, grading the precipitate, and separating to obtain upper suspension and lower slurry.
3. And (3) closing a thick gap by silting: and pouring the slurry into a river channel matrix engineering area to be repaired until water is accumulated, and after pouring, air-drying for 1d, and circulating for 3 times.
4. Fine gap silting: and pouring the suspension into the river channel matrix engineering area with the repaired coarse gap till water accumulation occurs, and airing for 1d after pouring, and circulating for 3 times.
5. Backfilling surface soil: and uniformly mixing the residual slurry and surface soil, and paving the mixture on the surface of the river channel matrix engineering area subjected to fine gap silting repair, wherein the paving thickness is 10 cm.
Example 4
This example provides a method for repairing damaged river channel matrix, comprising the following steps,
1. cleaning the surface layer of the field: and (3) removing sundries such as dead branches, fallen leaves, weeds and the like on the ground surface of the engineering area, and removing undisturbed trees and shrubs without removing the sundries. The cleaning range is 40cm higher than the daily water level elevation. And constructing banks for partitioning (the spacing between banks is 20m, and the corresponding area is 400 m)2)。
2. Hydration grading: 50kg of natural sodium bentonite is slowly added into 625kg of water, and the mixture is fully stirred and hydrated to be uniformly dispersed. Stirring, standing for 45min, grading the precipitate, and separating to obtain upper suspension and lower slurry.
3. And (3) closing a thick gap by silting: and pouring the slurry into a river channel matrix engineering area to be repaired until water is accumulated, and after pouring, drying for 4 days in air, and circulating for 4 times.
4. Fine gap silting: and pouring the suspension into the river channel matrix engineering area with the repaired coarse gap till water accumulation occurs, and airing for 4d after pouring, and circulating for 4 times.
5. Backfilling surface soil: and uniformly mixing the residual slurry and surface soil, and paving the mixture on the surface of the river channel matrix engineering area subjected to fine gap silting repair, wherein the paving thickness is 20 cm.
Example 5
This example provides a method for repairing damaged river channel matrix, comprising the following steps,
1. cleaning the surface layer of the field: and (3) removing sundries such as dead branches, fallen leaves, weeds and the like on the ground surface of the engineering area, and removing undisturbed trees and shrubs without removing the sundries. The cleaning range is 30cm higher than the daily water level elevation. And constructing banks for partitioning (the spacing between banks is 20m, and the corresponding area is 400 m)2)。
2. Slurry preparation: 50kg of natural sodium bentonite is slowly added into 500kg of water, and the natural sodium bentonite is fully stirred and hydrated to be uniformly dispersed. Stirring, standing for 30min to obtain slurry with upper layer of suspension and lower layer of slurry.
3. And (3) closing a thick gap by silting: and pouring the slurry into a river channel matrix engineering area to be repaired until water is accumulated, and after pouring, air-drying for 3d, and circulating for 4 times.
4. Fine gap silting: and pouring the suspension into the river channel matrix engineering area with the repaired coarse gap till water accumulation occurs, and airing for 3d after pouring, and circulating for 4 times.
Comparative example 1
The comparative example provides a method for repairing a damaged river channel matrix, comprising the steps of,
1. cleaning the surface layer of the field: and (4) removing sundries such as dead branches and fallen leaves on the surface of the engineering area, weeds and the like, and transplanting on-site arbors and shrubs (scattered undisturbed arbors do not need to be removed). The cleaning range is higher than the daily water level by more than 30 cm.
2. Excavating a field: and excavating the on-site earthwork according to the design elevation, reserving the backfill thickness to be not less than 50cm, and abandoning the surplus earthwork.
3. Backfilling with cohesive soil: obtaining cohesive soil from a cohesive soil mining area or a purchasing place, spraying water according to the optimal water content index requirement obtained in a laboratory to adjust the water content of the soil, tamping each layer of the virtual paved cohesive soil by 20-30 cm, wherein the compaction degree is not less than 90%, performing interlayer napping treatment, backfilling layer by layer, and backfilling the clay by 50cm in total thickness.
4. Surface layer protection: and according to the anti-impact water flow condition, backfilling the surface layer with the on-site excavated gravel material.
Test example
Test example 1
And performing soil column simulation experiments in a laboratory.
The water flow leakage rate of the gravel matrix column was initially 800cm/d and was treated as in examples 1-6 and comparative example 1. The results of the treatment are shown in the following table:
according to the table, the damaged river channel repairing method provided by the invention has the effect reaching that of the traditional clay repairing method, and has the advantages of being close to nature, less in disturbance, small in engineering quantity and the like.
Test example 2
Pilot scale experiments (all areas are 10m x 10m) were carried out on the site of the immortal river sand gravel material river channel matrix.
The leak rate at the site of the experiment was 500cm/d, and the treatment was carried out by the methods of examples 1 to 6 and comparative example 1. The results of the treatment are shown in the following table:
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | |
| Rate of leakage | 5cm/d | 3cm/d | 6cm/d | 4cm/d | 5cm/d | 6cm/d |
As can be seen from the above table, the repairing effect of the method of the present invention is equal to or superior to that of the conventional method.
Test example 3
Pilot scale (all 10m x 10m in area) experiments were performed in the sand soil field of the Yong Leng shop.
The leak rate at the site of the experiment was 200cm/d, and the treatment was carried out by the methods of examples 1 to 6 and comparative example 1. The results of the treatment are shown in the following table:
| example 1 | Example 2 | Practice ofExample 3 | Example 4 | Example 5 | Comparative example 1 | |
| Rate of leakage | 3cm/d | 1cm/d | 5cm/d | 2cm/d | 3cm/d | 5cm/d |
As can be seen from the above table, the repairing effect of the method of the present invention is equal to or superior to that of the conventional method.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method for repairing damaged river channel matrix is characterized by comprising the following steps,
(1) hydration grading: uniformly mixing bentonite and water, standing and grading to obtain an upper suspension and a lower slurry;
(2) and (3) closing a thick gap by silting: pouring the slurry to a river channel matrix engineering area to be repaired until water is accumulated and air-dried;
(3) fine gap silting: and pouring the suspension into a river channel matrix engineering area with the repaired coarse gap till water accumulation and air drying occur.
2. The method for repairing a damaged river channel matrix according to claim 1, wherein the step (2) is repeated 3-5 times;
and/or, said step (3) is repeated 3-5 times.
3. The method for repairing a damaged river channel matrix according to any one of claims 1 or 2, wherein the air drying time is 1-7 d.
4. The method for repairing the matrix of the damaged river channel according to claim 1, wherein the mass ratio of the bentonite to the water in the step (1) is 1: (10-15).
5. The method for repairing a damaged river channel matrix according to claim 1, wherein the standing time in the step (1) is 15-60 min.
6. The method for repairing a damaged river channel matrix according to claim 1, wherein the bentonite is at least one of natural sodium bentonite, natural calcium bentonite and modified bentonite.
7. The method for repairing damaged river channel matrix according to claim 1, further comprising performing surface layer cleaning on the river channel matrix engineering area to be repaired before the step (1).
8. The method of claim 7, wherein the cleaning comprises: removing dead branches, fallen leaves and weeds on the ground surface of the river channel matrix engineering area to be repaired, wherein the original trees and shrubs do not need to be removed;
and/or the cleaning range is 30-50cm higher than the daily water level, and the partition is constructed.
9. The damaged river channel matrix restoration method according to claim 1, further comprising backfilling surface planting soil after the step (3).
10. The method for repairing the damaged river channel matrix according to claim 9, wherein the residual slurry is uniformly mixed with surface soil and laid on the surface of the river channel matrix engineering area after the fine gap siltation repair.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115316064A (en) * | 2022-08-25 | 2022-11-11 | 北京市水科学技术研究院 | Soil matrix improvement method and application thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114411618B (en) | 2023-11-24 |
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