Flood intercepting ditch structure suitable for high expansive soil area
By setting up structures such as water barrier, bearing pad and sand pebble layer in the flood interception ditch, the deformation and damage of flood interception ditch in high-expanded soil areas are solved, and the effect of reducing the impact of expanded soil is achieved, simplifying construction and reducing the construction The cost.
Patent Information
- Application Number
- CN202421066564.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-16
AI Technical Summary
In areas with high expansive soil, flood cutoff ditches are prone to bulging deformation and extrusion failure after operation, and the existing treatment methods are large and uneconomical.
The water barrier layer is laid in the foundation pit of the flood ditch, a load-bearing cushion layer and a sand and pebbles layer, combined with the clay layer and plain concrete cushion layer, the peripheral water drainage layer and protective surface, and lime is added to the backfill soil to weaken the expansive soil. Effect of the groove body.
Through the combination of multiple measures, the impact of expansive soil on flood ditches is reduced, the impact of water pressure and seepage on surrounding soil is reduced, construction is simplified and costs are reduced.
Smart Images
Figure CN222275709U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ditch design optimization in high-expansion soil areas, in particular to a flood interception ditch structure suitable for high-expansion soil areas. Background Art
[0002] Flood interception ditches are strip-shaped structures used to intercept upstream mountain torrents and drain floodwaters. They are generally used in site leveling projects. Since expansive soil has the characteristics of swelling when exposed to water and shrinking when losing water, and the ditch itself is used to intercept or drain water, ditches in expansive soil areas often experience "bulging" deformation and extrusion damage within a period of time after operation; and once the ditch is damaged, the water inside it will aggravate the impact on the surrounding expansive soil, thereby aggravating the expansion and contraction effect, and will also have an adverse impact on surrounding structures. In expansive soil areas, there are generally two ways to deal with ditches. One is to replace the soil, that is, to completely replace the original expansive soil; the other is that the ditch itself considers bearing the expansion force generated by the expansion of this part of the soil, but no matter which method is used, the amount of work to be handled is often relatively large and uneconomical. Utility Model Content
[0003] The utility model aims to provide a flood interception ditch structure suitable for high expansive soil areas to solve the problem that the ditch in the expansive soil area will bulge and deform and be squeezed and damaged after running for a period of time, and the existing treatment method has large engineering workload and is uneconomical.
[0004] The utility model is realized by adopting the following technical solutions:
[0005] The utility model provides a flood intercepting ditch structure suitable for areas with high expansive soil, comprising a waterproof layer laid in a foundation pit of the flood intercepting ditch, the waterproof layer covers the side walls and the bottom surface of the foundation pit of the flood intercepting ditch, a bearing cushion layer is arranged on the waterproof layer, the bearing cushion layer is located at the bottom of the foundation pit of the flood intercepting ditch, a flood intercepting ditch body is arranged above the bearing cushion layer, flood intercepting ditch peripheral water drainage layers are arranged on both sides of the bottom of the ditch body of the flood intercepting ditch, a sand and gravel layer is arranged on the outer side of the side wall of the ditch body of the flood intercepting ditch, and the outer side of the sand and gravel layer is arranged with native backfill soil of the ditch.
[0006] As the preferred technical solution:
[0007] The waterproof layer adopts composite geomembrane.
[0008] As the preferred technical solution:
[0009] Both sides of the composite geomembrane coincide with the edges of the excavation line of the flood intercepting ditch foundation pit.
[0010] As the preferred technical solution:
[0011] The bearing cushion layer is a lime soil cushion layer.
[0012] As the preferred technical solution:
[0013] The water drainage layer outside the flood interception ditch is made of clay layer.
[0014] As the preferred technical solution:
[0015] A plain concrete cushion layer is arranged above the bearing cushion layer, and the flood interception ditch body is placed on the plain concrete cushion layer.
[0016] As the preferred technical solution:
[0017] The clay layers are respectively arranged on both sides of the flood intercepting ditch body and the plain concrete cushion layer, and the top surface of the clay layer is flush with the bottom of the flood intercepting ditch body.
[0018] As the preferred technical solution:
[0019] Lime is added into the native backfill soil of the ditch.
[0020] As the preferred technical solution:
[0021] The top surfaces of the sand and gravel layer and the native backfill soil of the ditch are provided with protective surfaces, and the top surfaces of the protective surfaces are flush with the top surface of the flood interception ditch body.
[0022] As the preferred technical solution:
[0023] The face protection is made of clay.
[0024] As the preferred technical solution:
[0025] A through hole is provided on the side wall of the flood intercepting ditch body, and a PVC pipe is installed in the through hole.
[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0027] The utility model reduces the influence of the expansion of the peripheral expansive soil on the flood intercepting ditch body by arranging the sand and gravel layers on both sides of the flood intercepting ditch body and the bearing cushion layer at the bottom, and reduces the squeezing effect of the lateral expansion force of the expansive soil on the flood intercepting ditch body; at the same time, because the sand and gravel layers have the characteristic of strong water permeability, the peripheral water level is effectively lowered and the water pressure is reduced; the influence of the surface water on the base expansive soil is alleviated by arranging the gray soil cushion layer; the influence of the seepage water outside the ditch on the expansive soil next to it is avoided by arranging the waterproof layer, so as to prevent the seepage water in the ditch from infiltrating into the peripheral expansive soil; the water outside the flood intercepting ditch is discharged by arranging the clay layer; and the expansion force exerted on the flood intercepting ditch body by the expansive soil after swelling with water is reduced by adding lime to the local backfill soil of the ditch; the utility model reduces the influence of high expansive soil on the flood intercepting ditch body and other structures without increasing the size of the flood intercepting ditch body by combining multiple measures, and the construction is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a cross-sectional view of a flood interception ditch structure suitable for areas with high expansive soils as described in the utility model.
[0029] Icons: 1-composite geomembrane, 2-lime soil cushion layer, 3-plain concrete cushion layer, 4-flood diversion ditch body, 5-clay layer, 6-sand and gravel layer, 7-native backfill soil of ditch, 8-clay facing, 9-PVC plastic pipe. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] Example 1
[0032] like Figure 1 As shown, this embodiment proposes a flood intercepting ditch structure suitable for areas with high expansive soil, including a waterproof layer laid in the foundation pit of the flood intercepting ditch, and the waterproof layer covers the two side walls and the bottom surface of the foundation pit of the flood intercepting ditch. The waterproof layer is used to prevent the influence of water seepage outside the ditch on the expansive soil next to it, so as to prevent the seepage water in the ditch from infiltrating into the surrounding expansive soil. In this embodiment, the waterproof layer adopts a composite geomembrane 1.
[0033] A bearing cushion layer is arranged on the waterproof layer, and the bearing cushion layer is located at the bottom of the foundation pit of the flood diversion ditch. The bearing cushion layer is required to have high bearing capacity and weak water permeability. In the present embodiment, the bearing cushion layer adopts a 500 mm thick ash soil cushion layer 2. The ash soil cushion layer 2 has high bearing capacity and weak water permeability, can meet the bearing capacity requirements of the bearing layer of the foundation of general structures, and can reduce the influence of surface water on the base expansive soil.
[0034] A plain concrete cushion layer 3 is arranged above the bearing cushion layer, and a flood intercepting ditch body 4 is placed on the plain concrete cushion layer 3. Clay layers 5 are arranged on both sides of the flood intercepting ditch body 4 and the plain concrete cushion layer 3, respectively, and the top surface of the clay layer 5 is flush with the bottom of the flood intercepting ditch body 4. The clay layer 5 is used to drain water outside the flood intercepting ditch.
[0035] The outer sides of the two side walls of the flood intercepting ditch body 4 are provided with a gravel layer 6, which has the characteristics of large porosity and strong water permeability, and can effectively reduce the squeezing of the flood intercepting ditch body 4 by the lateral expansion force. At the same time, since the gravel layer 6 has the characteristics of strong water permeability, it can effectively lower the peripheral water level and reduce the water pressure.
[0036] The outer side of the sand and gravel layer 6 is provided with a channel backfill soil 7, which is original soil with lime added, i.e. improved soil, for reducing the expansion force exerted on the flood interception ditch body 4 by the expansive soil after swelling with water.
[0037] The top surfaces of the sand and gravel layer 6 and the native backfill soil 7 of the ditch are protected by a clay face 8 with a thickness of 300 mm, and the top surface of the face is flush with the top surface of the flood interception ditch body 4 .
[0038] A through hole is provided on the side wall of the flood intercepting ditch body 4, and a PVC plastic pipe 9 with a diameter of φ of 100 mm is installed in the through hole.
[0039] The sand and gravel layers 6 and the gray soil cushion layer 2 at the bottom of the flood intercepting ditch body 4 arranged on both sides of the utility model weaken the influence of the expansion of the peripheral expansive soil on the flood intercepting ditch body 4. However, the flood intercepting ditch itself is a water channel, and the water inside it will also affect the surrounding expansive soil after seepage, and then affect the ditch native soil. The utility model can solve this problem by arranging a composite geomembrane 1 in the excavated flood intercepting ditch foundation pit. The two sides of the composite geomembrane 1 coincide with the edges of the excavation line to prevent the seepage water in the flood intercepting ditch body 4 from infiltrating into the peripheral expansive soil.
[0040] Taking the red clay of a certain area as an example, the expansion force of the expansive soil can reach up to 300kPa when it expands freely in water; and the soil pressure of 1m in general is about 7.7kPa, and the expansion force of 300kPa is equivalent to the soil pressure of nearly 40m deep or the water pressure of 30m. Generally, the depth of the intercepting ditch body does not exceed 3m. If such a huge expansion force acts on the outside of the intercepting ditch body, the structural wall thickness of the intercepting ditch body needs to be greatly thickened, resulting in a large amount of engineering and uneconomical. The intercepting ditch structure provided by the utility model can reduce the impact of high expansion soil on the intercepting ditch body and other structures without increasing the size of the intercepting ditch body, and the construction is simple and the cost is low.
[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A flood interception ditch structure suitable for high expansive soil areas, characterized by: It includes an impermeable layer laid in the foundation pit of the flood diversion ditch, the impermeable layer covers the side walls and the bottom surface of the foundation pit of the flood diversion ditch, a bearing cushion layer is arranged on the impermeable layer, the bearing cushion layer is located at the bottom of the foundation pit of the flood diversion ditch, a flood diversion ditch body is arranged above the bearing cushion layer, flood diversion ditch peripheral water drainage layers are arranged on both sides of the bottom of the flood diversion ditch body, a sand and gravel layer is arranged on the outer side of the side wall of the flood diversion ditch body, and the outer side of the sand and gravel layer is provided with native backfill soil of the ditch.
2. The flood interception ditch structure suitable for high expansive soil areas according to claim 1 is characterized in that: The waterproof layer adopts composite geomembrane.
3. The flood interception ditch structure suitable for high expansive soil areas according to claim 2 is characterized in that: Both sides of the composite geomembrane coincide with the edges of the excavation line of the flood intercepting ditch foundation pit.
4. The flood interception ditch structure suitable for high expansive soil areas according to claim 1 is characterized in that: The bearing cushion layer is a lime soil cushion layer.
5. The flood interception ditch structure suitable for high expansive soil areas according to claim 1 is characterized in that: The water drainage layer outside the flood interception ditch is made of clay layer.
6. The flood interception ditch structure suitable for high expansive soil areas according to claim 5 is characterized by: A plain concrete cushion layer is arranged above the bearing cushion layer, and the flood interception ditch body is placed on the plain concrete cushion layer.
7. The flood interception ditch structure suitable for high expansive soil areas according to claim 6 is characterized by: The clay layers are respectively arranged on both sides of the flood intercepting ditch body and the plain concrete cushion layer, and the top surface of the clay layer is flush with the bottom of the flood intercepting ditch body.
8. The flood interception ditch structure suitable for high expansive soil areas according to claim 1 is characterized by: Lime is added into the native backfill soil of the ditch.
9. The flood interception ditch structure suitable for high expansive soil areas according to claim 1, characterized in that: The top surfaces of the sand and gravel layer and the native backfill soil of the ditch are provided with protective surfaces, and the top surfaces of the protective surfaces are flush with the top surface of the flood interception ditch body.
10. The flood interception ditch structure suitable for high expansive soil areas according to claim 9, characterized in that: The face protection is made of clay.