A protection structure for black soil erosion gully side slope and a construction method thereof

Abstract

The application discloses a protection structure for black soil erosion ditch side slope and a construction method, and belongs to the field of soil and water conservation. The protection structure comprises a geotextile laid on the bottom of a ditch and a side slope, wherein the upper end and the lower end of the geotextile are respectively provided with an upper bending part and a lower bending part, the side slope and the ground level connecting part is provided with an upper backfill groove, the bottom is provided with a lower backfill groove, and the upper bending part and the lower bending part are respectively embedded in the upper backfill groove and the lower backfill groove; the upper backfill groove and the lower backfill groove are respectively filled with backfill soil; the construction method comprises the following steps: obtaining soil data and flow characteristic information of the ditch, and preparing for construction; according to the soil data, excavating the upper backfill groove and the lower backfill groove at the side slope and the ground level connecting part and the bottom respectively; and according to the soil data, selecting the size of the geotextile. The application can solve the problem that there is no effective method to prevent the ditch on the black soil from being eroded in the prior art, and has the advantages of simple structure, low cost and good protection effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the civil engineering technical field, specifically relates to a kind of for black soil erosion ditch slope protection structure and construction method. BACKGROUND

[0002] Black soil mainly distributes in northeast China, and the climate of this area is relatively cold, and the main plants are annual or deciduous plants. The ditch in black soil is easily affected by water flow and climate, and serious erosion problem occurs.

[0003] The erosion prevention method commonly used in general area, such as by planting vegetation on the slope, or hardening and pouring on the slope, is difficult to be used in black soil area. Because of the climate factors in black soil, most of the vegetation will be killed by winter cold, and then be washed away by water flow after thawing in spring; and the plant growth is slow in high latitude area, so the method of planting vegetation is actually poor in effect. Hardening and pouring on the ditch and slope, on the one hand, is high in cost, and on the other hand, will also affect the circulation process of surface water and underground water under the hardened ditch, reduce the underground water storage, and affect agricultural production. SUMMARY

[0004] The present application provides a kind of for black soil erosion ditch slope protection structure and construction method to solve the problem of lack of effective method to prevent the ditch in black soil from being eroded in the prior art.

[0005] To solve the above technical problems, the present application adopts the following technical scheme:

[0006] A kind of for black soil erosion ditch slope protection structure is provided, which includes geotextile laid on the groove bottom and the slope, and the upper end and the lower end of the geotextile are respectively provided with upper bending part and lower bending part, the slope and ground connection part is provided with upper backfill groove, and the groove bottom is provided with lower backfill groove, and the upper bending part and the lower bending part are respectively buried in the upper backfill groove and the lower backfill groove;The upper backfill groove and the lower backfill groove are respectively filled with backfill soil;

[0007] The geotextile is provided with a plurality of U-shaped nails buried therein;A pouring hole is formed in the groove below the lower side of the U-shaped nail, and a pouring block is arranged in the pouring hole, and the pouring block is fixedly connected with the U-shaped nail;A plurality of plants are arranged on the geotextile, and the roots of the plants are distributed on the slope and the groove bottom.

[0008] The present application also provides a kind of construction method for the above-mentioned black soil erosion ditch slope protection structure, which includes the following steps:

[0009] S1, obtain the soil data and water flow characteristic information of the ditch, and prepare for construction;

[0010] S2, according to the soil data, excavating an upper backfill groove and a lower backfill groove at the connecting part of the slope and the ground and the groove bottom respectively;

[0011] S3, according to the soil data, selecting the size of the geotextile;

[0012] S4, laying the geotextile, so that the upper end of the geotextile is located in the upper backfill groove, and the upper end is bent to obtain an upper bent part;

[0013] so that the lower end of the geotextile is located in the lower backfill groove, and the lower end is bent to obtain a lower bent part;

[0014] backfilling the upper backfill groove and the lower backfill groove;

[0015] S5, according to the water flow characteristic information, selecting the position of the U-shaped nail, and burying the U-shaped nail;

[0016] S6, after the position of the U-shaped nail is fixed, cutting a plurality of small holes on the geotextile, planting plants, and completing the construction.

[0017] The above-mentioned protective structure for the slope of the black soil erosion ditch provided by the application has the following main beneficial effects:

[0018] By covering the slope and the groove bottom of the ditch with the geotextile, the direct contact between the flowing water and the soil in the ditch is reduced, thereby directly eliminating the possibility of the erosion of the slope of the ditch by the flowing water in a physical way, and effectively protecting the slope of the ditch; by respectively setting the upper backfill groove and the lower backfill groove, and covering them with backfill soil, the two ends of the geotextile are fixed, and the geotextile is prevented from being rolled away by the flowing water.

[0019] When the flowing water hits the main body of the geotextile, the upper bent part will be subjected to a downward pulling force, and the pulling force is transferred to the slope in contact with the upper bent part through the action of the upper bent part, thereby exerting a pressure parallel to the direction of the slope on the slope, thereby improving the structural stability of the slope. By extending the lower bent part into the lower backfill groove at the groove bottom, the lower bent part is prevented from being rolled up by the flowing water, thereby ensuring the structural stability of the geotextile and the ditch.

[0020] By setting the U-shaped nail, the main structure of the geotextile is fixed, and by setting the pouring block, the position of the U-shaped nail is fixed, and the part of the ditch corresponding to the lower side of the U-shaped nail is reinforced, thereby increasing the structural strength of the ditch and further improving the erosion resistance.

[0021] The above-mentioned construction method for the protective structure for the slope of the black soil erosion ditch provided by the application has the following main beneficial effects:

[0022] By setting the U-shaped nail, and burying the geotextile edge with the upper backfill groove and the lower backfill groove, the geotextile can be prevented from being washed away, and the position of the geotextile can be fixed, the service life of the geotextile is provided, and the aging resistance of the geotextile is ensured. Since the hardened structure arranged in the soil body is only a small volume of pouring block, the hardened structure is not affected by the frost heaving and thawing of black soil, and has strong frost heaving resistance. By setting the plant, the geotextile can be fixed and the erosion resistance can be enhanced. The plant can protect the geotextile from the harm of direct sunlight and provide the service life of the geotextile.

[0023] The protection structure provided by the present application has simple overall structure, convenient installation, low cost and strong practicality. By combining the specific soil data and water flow characteristic information of the trench where the protection structure is arranged, the applicability of the protection structure to the trench is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the present application.

[0025] Figure 2 is a flowchart of the present application.

[0026] 1, trench, 11, groove bottom, 12, slope, 13, ground level, 2, geotextile, 21, upper bending part, 22, lower bending part, 23, plant, 3, pouring hole, 31, U-shaped nail, 32, pouring block, 33, upper backfill groove, 34, lower backfill groove, 35, backfill soil. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the drawings:

[0028] As shown in the figure, it is a structural schematic diagram of the protection structure for the black soil erosion ditch slope. Figure 1

[0029] The protection structure for the black soil erosion ditch slope of the present application comprises a geotextile 2 laid on the groove bottom 11 and the slope 12 of the trench 1, the upper end and the lower end of the geotextile 2 are respectively provided with an upper bending part 21 and a lower bending part 22, the connection part of the slope 12 and the ground level 13 is provided with an upper backfill groove 33, the groove bottom 11 is provided with a lower backfill groove 34, the upper bending part 21 and the lower bending part 22 are respectively buried in the upper backfill groove 33 and the lower backfill groove 34; the upper backfill groove 33 and the lower backfill groove 34 are respectively filled with backfill soil 35.

[0030] The geotextile 2 is provided with a plurality of U-shaped nails 31 buried thereon; the trench 1 on the lower side of the U-shaped nail 31 is provided with a pouring hole 3, the pouring hole 3 is provided with a pouring block 32, and the pouring block 32 is fixedly connected with the U-shaped nail 31.

[0031] ​The soil cloth 2 is provided with a plurality of plants 23, and the roots of the plants 23 are distributed on the slope 12 and the groove bottom 11, so as to fix the soil cloth 2 and enhance the anti-erosion effect, and the plants 23 can provide shade for the soil cloth 2, reduce the damage of direct sunlight, and prolong the service life of the soil cloth 2.

[0032] Specifically, the U-shaped nails 31 are distributed on the upper bending part 21, the lower bending part 22, the slope 12, the groove bottom 11 and the slope-groove bottom connecting part.

[0033] Preferably, the U-shaped nails 31 located on the slope 12 and the lower bending part 22 are perpendicular to the side edges of the slope 12 and the lower bending part 22, and the U-shaped nails 31 located on the upper bending part 21, the groove bottom 11 and the slope-groove bottom connecting part are vertically arranged, so as to maximize the fixing effect of the U-shaped nails 31.

[0034] Preferably, the soil cloth 2 is a high-strength composite soil material with water permeability, and CDASS material can also be used, so as to prolong the service life and prevent water erosion, and save cost.

[0035] The application also provides a construction method based on the reinforcing structure, as shown in the figure, which comprises the following steps: Figure 2

[0036] S1, obtaining soil data and water flow characteristic information of the groove 1, and preparing for construction.

[0037] Further, the soil data includes size data of the cross section of the groove 1, length of the groove 1 to be constructed, physical state of the soil and slope stability data; and the water flow characteristic information includes water flow erosion characteristics of the groove 1 and normal water content state of the groove 1.

[0038] The construction preparation includes:

[0039] When the groove 1 is in a non-dry state, the water flow is intercepted upstream of the area to be constructed until the soil in the groove 1 is in a dry or semi-dry state.

[0040] S2, according to the soil data, excavating the upper backfill groove 33 and the lower backfill groove 34 at the connecting part of the slope 12 and the ground surface 13 and the groove bottom 11 respectively.

[0041] Further, the excavation of the upper backfill groove 33 and the lower backfill groove 34 includes the following requirements:

[0042] S2-1, the characteristics of the upper backfill groove 33 include:

[0043] The side edge of the upper backfill groove 33 adjacent to the slope 12 is perpendicular to the slope 12.

[0044] ​When the water flow impacts the main body of the geotextile 2, the upper bending part 21 will be subjected to a downward pulling force, and the pulling force will be transferred to the slope 12 in contact with the upper bending part 21 through the action of the upper bending part 21, thereby exerting a downward pressure on the slope 12 parallel to the direction of the slope 12, thereby improving the structural stability of the slope 12.

[0045] The excavation depth of the upper backfill groove 33 is equal to the distance from the connection point of the upper backfill groove 33 and the slope 12 to the connection point of the slope 12 and the ground surface 13. The length of the geotextile 2 required is calculated conveniently.

[0046] The excavation depth of the upper backfill groove 33 is greater than 1 / 5 of the length of the slope 12 and less than 1 / 4 of the length of the slope 12. The softer the soil, the greater the excavation depth of the upper backfill groove 33, so as to ensure the weight of the backfill soil 35 pressing the upper bending part 21 of the geotextile 2, thereby ensuring the fixing effect.

[0047] S2-2, the features of the lower backfill groove 34 include:

[0048] The length of the side adjacent to the adjacent slope 12 of the lower backfill groove 34 is greater than twice the excavation depth of the upper backfill groove 33, so as to ensure the length of the lower bending part 22 cooperating with the lower backfill groove 34. Since the groove bottom 11 is more frequently impacted by the water flow, by lengthening the length of the lower bending part 22, the stability of the geotextile 2 is effectively ensured.

[0049] The inclination angle of the lower backfill groove 34 and the extension line of the groove bottom 11 is greater than the inclination angle of the slope 12 and the extension line of the groove bottom 11, as shown in Figure 1 wherein angle A is the inclination angle of the slope 12 and the extension line of the groove bottom 11, and angle B is the inclination angle of the lower backfill groove 34 and the extension line of the groove bottom 11. Thus, the friction force between the lower bending part 22 and the lower backfill groove 34 is ensured, and the lower bending part 22 is prevented from being pulled upward when the main body of the geotextile 2 is impacted by the water flow.

[0050] The distance from the connection point of the lower backfill groove 34 and the groove bottom 11 to the connection point of the groove bottom 11 and the slope 12 is equal to the distance from the connection point of the upper backfill groove 33 and the slope 12 to the connection point of the groove bottom 11 and the slope 12, thereby facilitating the calculation of the size of the geotextile 2 required.

[0051] S2-3, the length of the upper bending part 21 is the same as the excavation depth of the upper backfill groove 33, and the length of the lower bending part 22 is the same as the length of the side adjacent to the adjacent slope 12 of the lower backfill groove 34.

[0052] S3, according to the soil data, the size of the geotextile 2 is selected.

[0053] Specifically, the geotextile 2 is located at a cross-section of the trench 1, and the width of the cross-section is equal to the sum of the length of the upper bending part 21 and the lower bending part 22, the distance from the connecting point of the lower backfill groove 34 to the trench bottom 11 to the connecting point of the trench bottom 11 to the slope 12, and the distance from the connecting point of the upper backfill groove 33 to the slope 12 to the connecting point of the trench bottom 11 to the slope 12.

[0054] S4, laying the geotextile 2, so that the upper end of the geotextile 2 is located in the upper backfill groove 33, and the geotextile 2 is bent to form the upper bending part 21.

[0055] The lower end of the geotextile 2 is located in the lower backfill groove 34, and the geotextile 2 is bent to form the lower bending part 22.

[0056] Backfilling the upper backfill groove 33 and the lower backfill groove 34.

[0057] Preferably, the backfill soil 35 should be compacted in layers, and the compaction coefficient should be at least 0.9.

[0058] S5, selecting the position of the U-shaped nail 31 according to the flow characteristics information, and burying the U-shaped nail 31.

[0059] Preferably, the size of the U-shaped nail 31 is:

[0060] 800mm long on one side, 150mm wide, the top of the U-shaped nail 31 is sharpened at 45° to one side, and the length of a single U-shaped nail 31 is not less than 1750mm.

[0061] Further, the method of burying the U-shaped nail 31 includes the following steps:

[0062] S5-1, selecting the laying interval of the U-shaped nail 31 along the radial direction of the trench 1 according to the normal water state of the trench 1, and the specific method is:

[0063] When the normal state of the trench 1 is dry, the laying interval of the U-shaped nail 31 is one every 3m;

[0064] When the normal state of the trench 1 is intermittent water, the laying interval of the U-shaped nail 31 is one every 2m;

[0065] When the normal state of the trench 1 is flowing water, the laying interval of the U-shaped nail 31 is one every 1.5m.

[0066] Adjusting the laying interval of the U-shaped nail 31 according to the normal water state of the trench 1 to ensure the cooperation effect of the U-shaped nail 31 and the soil, and further ensure the fixing effect of the geotextile 2.

[0067] S5-2, burying the U-shaped nail at the set positions of the upper bending part 21, the lower bending part 22, the slope 12, the trench bottom 11, and the connecting part of the slope and the trench bottom in the trench 1.

[0068] Preferably, the distance between each U-shaped nail 31 burying point is equal.

[0069] S5-3, pull out the U-shaped nail 31 to obtain a pouring hole 3 with the size of the U-shaped nail 31.

[0070] S5-4, pour cement mortar into the pouring hole 3 until it is filled.

[0071] S5-5, insert the U-shaped nail 31 into the pouring hole 3 again to complete the embedding of the U-shaped nail 31.

[0072] The cement mortar cools to obtain a pouring block 32.

[0073] Preferably, the pouring block 32 is a cement block obtained by solidifying a cement mortar with a water-cement ratio of 4:1.

[0074] By inserting the U-shaped nail 31 again, the cement mortar is pressed into the surrounding soil, and the cement mortar tightly wraps the U-shaped nail 31 and the surrounding soil together, thereby greatly increasing the pullout resistance and improving the fixing effect of the U-shaped nail 31 and the erosion resistance of the trench 1.

[0075] S6, after the U-shaped nail 31 is fixed in position, a plurality of small holes are cut in the geotextile 2, and plants 23 are planted to complete the construction.

[0076] When a cutoff is provided upstream of the area to be constructed, after the U-shaped nail 31 is fixed in position and the pouring block 32 is cooled and formed, the cutoff can be removed to restore the normal state of the trench 1. The plants 23 can be willow trees to ensure their cold resistance.

[0077] By using the combination of engineering and plants to manage the erosion ditch, flood discharge is ensured, soil erosion is prevented, and the ditch erosion is prevented, while having good environmental benefits. On the one hand, the geotextile 2 is used to prevent water flow from washing and damaging the erosion ditch due to its good water flow resistance and soil retention properties. On the other hand, plants 23 are inserted into the ditch to enhance the fixing effect of the geotextile 2, and the shade of the plants 23 also avoids direct sunlight on the geotextile 2, reducing the aging effect of sunlight on the geotextile 2 and prolonging the service life of the geotextile 2. In addition, the geotextile 2 can also inhibit the disordered growth of the plants 23.

[0078] The specific embodiments of the present application are described above to facilitate understanding of the present application by those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments. For those skilled in the art, any changes within the spirit and scope of the present application as defined in the appended claims are obvious, and all inventions utilizing the concept of the present application are within the scope of protection.

Claims

1. A construction method for a protective structure for a black soil erosion gully side slope, characterized by, The geotextile is laid on the groove bottom and the slope, the upper end and the lower end of the geotextile are respectively provided with an upper bending part and a lower bending part, the slope and ground connection part is provided with an upper backfill groove, the groove bottom is provided with a lower backfill groove, the upper bending part and the lower bending part are respectively embedded in the upper backfill groove and the lower backfill groove; the upper backfill groove and the lower backfill groove are respectively filled with backfill soil; The geotextile is provided with a plurality of U-shaped nails embedded therein; a pouring hole is formed in the groove below the lower side of the U-shaped nail, and a pouring block is arranged in the pouring hole and fixedly connected with the U-shaped nail; a plurality of plants are arranged on the geotextile, and the roots of the plants are distributed on the slope and the groove bottom; The U-shaped nails are distributed on the upper bending part, the lower bending part, the slope, the groove bottom and the slope-groove bottom connection part; The geotextile is a water-permeable high-strength composite geotextile CDASS material; The method comprises the following steps: S1, obtaining soil data and water flow characteristic information of the groove, and preparing for construction; S2, according to the soil data, excavating an upper backfill groove and a lower backfill groove at the slope-ground connection part and the groove bottom respectively; The step S2 comprises: S2-1, the characteristics of the upper backfill groove comprise: The side of the upper backfill groove adjacent to the slope is perpendicular to the slope; The excavation depth of the upper backfill groove is equal to the distance from the upper backfill groove connection point to the slope-ground connection point; The excavation depth of the upper backfill groove is greater than 1 / 5 of the length of the slope and less than 1 / 4 of the length of the slope; S2-2, the characteristics of the lower backfill groove comprise: The length of the side of the lower backfill groove adjacent to the adjacent slope is greater than twice the excavation depth of the upper backfill groove; The inclination of the lower backfill groove and the groove bottom extension line is greater than the inclination of the slope and the groove bottom extension line; The distance from the lower backfill groove connection point to the groove bottom and the slope connection point is equal to the distance from the upper backfill groove connection point to the groove bottom and the slope connection point; S2-3, the length of the upper bending part is the same as the excavation depth of the upper backfill groove, and the length of the lower bending part is the same as the length of the side of the lower backfill groove adjacent to the adjacent slope; S3, selecting the size of the geotextile according to the soil data; The step S3 comprises: The width of the geotextile in the cross section of the groove is equal to the sum of the lengths of the upper bending part, the lower bending part, the distance from the lower backfill groove connection point to the groove bottom and the slope connection point, and the distance from the upper backfill groove connection point to the groove bottom and the slope connection point; S4, laying the geotextile, so that the upper end of the geotextile is located in the upper backfill groove, and the upper end is bent to obtain the upper bending part; The lower end of the geotextile is located in the lower backfill groove, and the lower end is bent to obtain the lower bending part; Backfilling the upper backfill groove and the lower backfill groove; S5, selecting the position of the U-shaped nail according to the water flow characteristic information, and embedding the U-shaped nail; the step S5 comprises: S5-1, selecting the radial U-shaped nail laying interval according to the normal water content state of the groove, and the specific method is: When the groove is in a dry state, the laying interval of the U-shaped nail is one every 3m; When the groove is in an intermittent water state, the laying interval of the U-shaped nail is one every 2m; When the groove is in a normal water state, the laying interval of the U-shaped nail is one every 1.5m; S5-2, embedding the U-shaped nail at the set positions of the upper bending part, the lower bending part, the slope, the groove bottom and the slope-groove bottom connection part in the groove; S5-3, pull out the U-shaped nail to get a pouring hole matching the size of the U-shaped nail; S5-4, pour cement slurry into the pouring hole until it is filled; S5-5, insert the U-shaped nail into the pouring hole again to complete the embedding of the U-shaped nail; S6, after the position of the U-shaped nail is fixed, cut a plurality of small holes on the geotextile, plant the plants, and complete the construction.

2. The method for constructing a protection structure for a black soil erosion gully side slope according to claim 1, characterized in that, The soil data includes size data of the trench cross section, length of the trench to be constructed, physical state of the soil, and slope stability data; and the water flow characteristic information includes water flow erosion characteristics of the trench and normal water content state of the trench.

3. The method for constructing a protection structure for a black soil erosion gully side slope according to claim 1, characterized in that, The construction preparation includes: When the trench is in a non-dry state, intercept the flow upstream of the area to be constructed until the soil in the trench is in a dry or semi-dry state.

4. The method for constructing a protection structure for a black soil erosion gully side slope according to claim 1, characterized in that, The size of the U-shaped nail is: 800mm in length and 150mm in width on one side, the top end of the U-shaped nail is sharpened at 45° to one side, and the length of the threaded steel used for a single U-shaped nail is not less than 1750mm; The pouring block is a cement block obtained by solidifying plain cement slurry with a water-cement ratio of 4:1; The plants are willow trees.

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