CN212316586U - Waterproof roadbed structure of black cotton soil - Google Patents
Waterproof roadbed structure of black cotton soil Download PDFInfo
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- CN212316586U CN212316586U CN202020591788.9U CN202020591788U CN212316586U CN 212316586 U CN212316586 U CN 212316586U CN 202020591788 U CN202020591788 U CN 202020591788U CN 212316586 U CN212316586 U CN 212316586U
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The utility model provides a waterproof roadbed structure of black cotton soil, it includes black cotton soil road base basement and waterproof combined layer, waterproof combined layer lays on the side slope inclined plane of the top surface of black cotton soil road base basement and the left and right sides, waterproof combined layer is by inlayer prevention of seepage geotechnological cloth, outer prevention of seepage geotechnological cloth and clamp are located non-expansive soil layer between the two and are constituteed, the left and right sides excavation of black cotton soil road base has slot and the ditch inslot to backfill to have the black cotton soil that is used for the pressure to cover the waterproof combined layer on the slope inclined plane of black cotton soil road base both sides, the top of the waterproof combined layer on black cotton soil road base top surface has been laid bed course and has been graded broken stone layer and is located the bed course top. The side slopes and the top surfaces on the two sides of the black cotton soil subgrade base are covered and protected by the waterproof combined layer, the waterproof combined layer has multilayer protection capability, the protection effect is good, and the engineering quality is stable; the black cotton soil roadbed base is formed by compacting undisturbed soil, so that the construction is convenient and the efficiency is high; the trench is backfilled with black cotton soil without abandoning a square for transportation.
Description
Technical Field
The utility model belongs to road bed construction field, concretely relates to waterproof roadbed structure of black cotton soil.
Background
The black cotton soil is one of expansive soil, is widely distributed in Indian German-dried plateau, is also distributed in African Nigeria, Elisa, Dongfei Dazgu and Tansylvania and the like, has the thickness of 0.5-5 m generally, and can locally reach more than 10 m. It is mainly formed by volcanic deposits or igneous rocks through weathering, water erosion, carrying and stacking, and is divided into primary black cotton soil and secondary black cotton soil. It is black, grey black cohesive soil with swelling and shrinking property, and its soil particles contain lots of strong hydrophilic mineral particles. Because it has the functions of water absorption expansion, water loss contraction and repeated action, it is easy to cause ground surface cracking and deformation, cracking, damage and the like of buildings, highways, railway beds and the like on the foundation soil.
At present, the length of a black cotton soil area distributed by crossing the major fissure valley of east Africa on an inner road is 60km in preliminary statistics, and the railway roadbed crossing the major fissure valley area passes through a filling roadbed. The construction technology of the black cotton land area of the railway roadbed or the filling roadbed has important significance in order to ensure the engineering quality, has simple design and easy construction, and can greatly reduce the engineering cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a black cotton soil waterproof roadbed structure aims at providing a black cotton soil roadbed structure that construction convenience, cost are low and engineering quality have better assurance.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a black cotton soil waterproof roadbed structure comprises a black cotton soil roadbed base and a waterproof combination layer, wherein the cross section of the black cotton soil roadbed base is in an isosceles trapezoid shape with a narrow upper part and a wide lower part, the waterproof combination layer is paved on the top surface of the black cotton soil roadbed base and the slope slopes at the left side and the right side, the waterproof combined layer consists of inner-layer anti-seepage geotextile, outer-layer anti-seepage geotextile and a non-expansive soil layer clamped between the inner-layer anti-seepage geotextile and the outer-layer anti-seepage geotextile, grooves are dug at the left side and the right side of the black cotton soil roadbed base, black cotton soil used for covering the waterproof combination layers on the slope slopes at the two sides of the black cotton soil roadbed base is backfilled in the grooves, and a cushion layer and a graded crushed stone layer are laid above the waterproof combination layer on the top surface of the black cotton soil roadbed substrate, and the graded crushed stone layer is positioned above the cushion layer.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, a plurality of steps are dug on slope slopes on two sides of the black cotton soil roadbed base, and each layer of steps extends along the longitudinal direction of the black cotton soil roadbed base.
The anti-seepage geotextile has the beneficial effects that the anti-seepage geotextile of the inner layer is more tightly pressed and attached to the slope inclined plane of the black cotton soil roadbed base when the non-expansive soil layer is convenient to construct, the step has the weight capable of loading the non-expansive soil along the longitudinal plane, the force of the non-expansive soil sliding down along the slope inclined plane is reduced, the friction force of the anti-seepage geotextile of the inner layer along the slope inclined plane is also reduced, the pulling fracture is avoided, and the effect of paving the waterproof combined layer on the black cotton soil roadbed base is better.
Furthermore, the left and right sides of the inner impermeable geotextile and the outer impermeable geotextile respectively extend into the groove, and the same sides of the inner impermeable geotextile and the outer impermeable geotextile are overlapped at the corresponding bottom wall of the groove in a stacking way, and the overlapping length is more than 25 cm.
The anti-seepage geotextile composite waterproof composite material has the beneficial effects that the side edges of the inner and outer anti-seepage geotextile layers are overlapped at the bottom of the groove in a stacking manner, and then the groove is tightly pressed and closed by the black cotton filled in the groove, so that the non-expansive soil layer is sealed between the inner and outer anti-seepage geotextile layers to form a waterproof composite layer with a multilayer waterproof effect, and the waterproof effect is better than that of the single anti-seepage geotextile commonly used in the prior art.
Further, the included angle between the slope inclined plane of the black cotton soil roadbed base and the horizontal plane is 30-60 degrees.
The adoption of the further scheme has the beneficial effect that the slope inclined plane with the inclination of 30-60 degrees can ensure that the waterproof combination layer is well adhered to the slope inclined plane.
Further, the average thickness of the non-expansive soil layer clamped between the inner-layer impermeable geotextile and the outer-layer impermeable geotextile is 15-30 cm.
The beneficial effect of adopting above-mentioned further scheme is that, through experimental non-swelling soil layer thickness comparatively suitable in above-mentioned interval, thick then the too big engineering cost of non-swelling soil quantity and construction work volume increase, thin then be unfavorable for whole waterproof combination layer to cover on the black cotton soil basement and paste tight effect and lead to the water-proof effects to reduce again.
Further, the cushion layer is formed by paving and rolling lime stabilized soil, and the thickness of the cushion layer is more than 20 cm.
The lime stabilized soil cushion layer has the beneficial effects that the lime stabilized soil cushion layer can prevent the broken stone graded layer from directly acting on the outer anti-seepage geotextile to damage the outer anti-seepage geotextile, and meanwhile, the lime stabilized soil cushion layer has good waterproof capability and can enhance the waterproof effect of the roadbed.
Further, the california bearing ratio of the graded crushed stone layer is more than 12% and the compactness is more than 95%.
The beneficial effect of adopting the above-mentioned further scheme is that, above-mentioned bearing ratio and compactness can guarantee that the pavement structure of upper strata can be better constructed, and upper strata pavement structure includes but not limited to concrete road surface, bituminous paving, sleeper rail etc..
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the side slopes and the top surfaces on the two sides of the black cotton soil road foundation base are covered and protected by waterproof combined layers, each waterproof combined layer is provided with an inner anti-seepage geotextile layer and an outer anti-seepage geotextile layer, and a non-expansive soil layer is clamped between the inner anti-seepage geotextile layer and the outer anti-seepage geotextile layer, and the black cotton soil road foundation base is not exchanged with external moisture due to the multi-layer protection capacity, so that the black cotton soil road foundation base is prevented from swelling and shrinking due to water absorption or water;
(2) the black cotton soil roadbed base is formed by compacting undisturbed soil, large-area excavation and filling are not needed, construction is convenient, and efficiency is high; the excavated black cotton soil is backfilled after a waterproof combination layer is laid on the substrate when the grooves are excavated on the two sides of the substrate, and the black cotton soil is not discarded, does not need to be transported outwards and does not need to be changed and filled;
(3) the roadbed structure can be constructed continuously in sections and can also be constructed simultaneously in multiple sections, and the flexibility is good.
Drawings
Fig. 1 is the utility model provides a pair of waterproof roadbed structure's of black cotton soil schematic diagram.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a black cotton soil roadbed basement; 2. inner impermeable geotextile; 3. outer impermeable geotextile; 4. a non-swelling soil layer; 5. a trench; 6. a cushion layer; 7. grading a crushed stone layer; 8. and (4) a step.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, if terms indicating orientation such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model provides a waterproof roadbed structure of black cotton soil, it includes black cotton soil road base basement 1 and waterproof combined layer, the cross sectional shape of black cotton soil road base basement 1 is the isosceles trapezoid of width under the narrow top, waterproof combined layer paves in on the side slope inclined plane of the top surface of black cotton soil road base basement 1 and the left and right sides, waterproof combined layer is located by inlayer prevention of seepage geotechnological cloth 2, outer prevention of seepage geotechnological cloth 3 and clamp non-inflation soil layer 4 between inlayer prevention of seepage geotechnological cloth 2 and the outer prevention of seepage geotechnological cloth 3 constitutes, the left and right sides excavation of black cotton soil road base 1 has slot 5 just backfill in slot 5 has to be used for the gland on the slope inclined plane of the side slope of black cotton soil road base 1 both sides the black cotton soil of waterproof combined layer, on the top surface of black cotton soil road base basement 1 the waterproof combined layer's top has laid bed course 6 and level broken stone layer 7 just the broken stone layer 7 is located on bed 6 And (4) preparing.
It should be noted that, the black cotton soil waterproof roadbed structure can be continuously constructed section by section in the longitudinal direction, and can also be constructed simultaneously in multiple sections, no matter which construction mode is adopted, the waterproof combination layers on two adjacent sections of roadbeds are overlapped in the longitudinal direction, and the overlapping length is more than 25 cm; the depth of the groove is between 150 and 260 cm.
In an embodiment of the present invention, a plurality of steps 8 are dug on the slope slopes of the two sides of the black cotton soil roadbed basement 1, and each layer of the steps 8 is extended along the longitudinal direction of the black cotton soil roadbed basement 1.
It should be noted that the steps may be a plurality of continuous steps (similar to a common stair structure) or a plurality of discontinuous steps, as shown in fig. 1.
In an embodiment of the present invention, the left and right sides of the inner impermeable geotextile 2 and the outer impermeable geotextile 3 respectively extend to the inside of the trench 5, and the inner impermeable geotextile 2 and the outer impermeable geotextile 3 are corresponding to the same side of the trench 5, and the overlapping length is more than 25 cm.
In an embodiment of the present invention, the selection criteria of the inner and outer impermeable geotextiles are: the thickness is more than 2mm, the breaking strength is more than 16.8kN/m, the breaking elongation is 45-85%, and the California bearing ratio bursting strength is more than 2.5 kN. In order to better prevent tearing, the inner and outer impermeable geotextiles are not required to be just tensioned on the slopes and the top surfaces of the two slopes of the black cotton soil during construction, but certain wrinkle-shaped margins are reserved on the slopes and the top surfaces of the two slopes.
In one embodiment of the present invention, the included angle between the slope inclined plane of the black cotton roadbed base 1 and the horizontal plane is 30 to 60 degrees.
It should be noted that the included angle is preferably 30-45 degrees, and at this time, the acting force between the waterproof combination layer and the slope along the slope is small, and the anti-tearing effect is good.
In one embodiment of the present invention, the average thickness of the non-expansive soil layer 4 sandwiched between the inner impermeable geotextile 2 and the outer impermeable geotextile 3 is 15-30 cm.
It should be noted that the soil used in the non-expansive soil layer can be triquette, lime stabilized soil or black cotton soil added with modified components, and the requirement is that the swelling and shrinking rate is small after water absorption or dehydration.
In an embodiment of the present invention, the cushion layer 6 is formed by rolling lime stabilized soil after being spread, and the thickness of the cushion layer 6 is more than 20 cm.
In addition to using lime stabilized soil as the spacer, it is also possible to use bentonite, fine sand, plastic road boards, steel plates, or the like.
Further, the california bearing ratio of the graded crushed stone layer 7 is more than 12% and the degree of compaction is more than 95%.
The utility model provides a waterproof roadbed structure of black cotton soil's work progress brief follows (only using the construction of one section road bed as an example):
(1) according to the line layout of a roadbed design drawing, removing the plowed soil or humus on the surface layer of the roadbed, exposing a black cotton soil area to be used as a roadbed base, and compacting to the design requirement (within the specified water content range) by using a road roller machine;
(2) digging a groove along the side line of the roadbed, then performing side slope excavation and trimming on the black cotton roadbed substrate from one side of the groove close to the substrate to obtain the black cotton roadbed substrate with the cross section in an isosceles trapezoid shape, quickly paving an inner-layer anti-seepage geomembrane (preventing water loss), then paving a non-expansive soil layer, properly compacting, and finally paving an outer-layer anti-seepage geomembrane;
(3) backfilling black cotton soil into the groove to tightly press and close the inner and outer impermeable geomembranes overlapped on the bottom wall of the groove (the black cotton soil of the backfilling buckle can be properly compacted);
(4) and (5) constructing a cushion layer and a broken stone graded layer at the top, namely completing the construction of a section of roadbed.
It should be noted that, after the construction of one section of roadbed is completed, the next section of roadbed can be constructed, and the waterproof combination layers of the two adjacent sections of roadbed are overlapped.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. The utility model provides a waterproof roadbed structure of black cotton soil, its characterized in that, includes black cotton soil road base basement (1) and waterproof combined layer, the cross sectional shape of black cotton soil road base basement (1) is the isosceles trapezoid of width under the narrow upper portion, waterproof combined layer cover in on the side slope inclined plane of the top surface of black cotton soil road base basement (1) and left and right sides, waterproof combined layer is by inlayer prevention of seepage geotechnological cloth (2), outer prevention of seepage geotechnological cloth (3) and press from both sides and locate non-inflation soil layer (4) are constituteed between inlayer prevention of seepage geotechnological cloth (2) and outer prevention of seepage geotechnological cloth (3), the left and right sides excavation of black cotton soil road base basement (1) has slot (5) and backfill in slot (5) has the black cotton soil that is used for pressing to cover on the side slope inclined plane of black cotton soil road base basement (1) both sides the waterproof combined layer, laid bed course (6) and rubble stone layer level on the top surface of black cotton soil road base basement (1) waterproof combined layer (7) And the graded crushed stone layer (7) is positioned above the cushion layer (6).
2. A black cotton soil waterproof roadbed structure according to claim 1, wherein a plurality of steps (8) are dug on the slope slopes on two sides of the black cotton soil roadbed base (1), and each layer of the steps (8) extends along the longitudinal direction of the black cotton soil roadbed base (1).
3. The black cotton soil waterproof roadbed structure according to claim 1, wherein left and right sides of the inner layer impermeable geotextile (2) and the outer layer impermeable geotextile (3) respectively extend into the trench (5), and the same sides of the inner layer impermeable geotextile (2) and the outer layer impermeable geotextile (3) are overlapped at the bottom wall of the corresponding trench (5) in a stacking manner, and the overlapping length is more than 25 cm.
4. The black cotton soil waterproof roadbed structure according to claim 1, wherein an included angle between a slope inclined plane of the black cotton soil roadbed substrate (1) and a horizontal plane is 30-60 degrees.
5. A black cotton soil waterproof roadbed structure according to claim 1, wherein the average thickness of the non-expansive soil layer (4) sandwiched between the inner impermeable geotextile (2) and the outer impermeable geotextile (3) is 15-30 cm.
6. A black cotton soil waterproof roadbed structure according to any one of the claims 1 to 5, wherein the cushion layer (6) is formed by rolling after lime stabilized soil is paved, and the thickness of the cushion layer (6) is more than 20 cm.
7. A black bentonite waterproofing roadbed structure according to any of the claims 1 to 5, characterized in that the California bearing ratio of the graded gravel layer (7) is above 12% and the degree of compaction is above 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020591788.9U CN212316586U (en) | 2020-04-20 | 2020-04-20 | Waterproof roadbed structure of black cotton soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020591788.9U CN212316586U (en) | 2020-04-20 | 2020-04-20 | Waterproof roadbed structure of black cotton soil |
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| Publication Number | Publication Date |
|---|---|
| CN212316586U true CN212316586U (en) | 2021-01-08 |
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| CN202020591788.9U Active CN212316586U (en) | 2020-04-20 | 2020-04-20 | Waterproof roadbed structure of black cotton soil |
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- 2020-04-20 CN CN202020591788.9U patent/CN212316586U/en active Active
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