CN218492175U - Red sandstone high fill road subgrade structure - Google Patents
Red sandstone high fill road subgrade structure Download PDFInfo
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- CN218492175U CN218492175U CN202221666228.0U CN202221666228U CN218492175U CN 218492175 U CN218492175 U CN 218492175U CN 202221666228 U CN202221666228 U CN 202221666228U CN 218492175 U CN218492175 U CN 218492175U
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Abstract
The utility model discloses a red sandstone high fill road roadbed structure belongs to the civil engineering field, has solved the problem that uneven settlement and fracture easily appear in red sandstone fill road bed. The utility model comprises an undisturbed soil foundation treatment layer, a foundation composite geotextile, a high fill roadbed backfill layer, a roadbed reinforcing impermeable layer, a embankment backfill layer, a roadbed backfill layer and a pavement structure layer which are arranged from bottom to top in sequence; a plurality of layers of dynamic compaction reinforcing layers are arranged at intervals in the backfill layer of the high fill roadbed, and a three-way geogrid in the roadbed is arranged at the top of each layer of dynamic compaction reinforcing layer. The utility model discloses subside, the deformation of road bed of filling height to the red sandstone has fine control effect to prevent the road bed settlement, solved the water softening problem of red sandstone, ensured road bed self bearing capacity.
Description
Technical Field
The utility model belongs to the civil engineering field, concretely relates to red sandstone height fill road roadbed structure.
Background
The red sandstone is one of rocks widely distributed in China, and the grain composition, the mineral composition, the chemical composition and the microstructure of the red sandstone in different areas are different, and the physical mechanical property and the engineering mechanical property are also different.
Ancient and recent strata are widely distributed in northwest regions of China, the sedimentary age of the red sandstone is relatively new, and the lithology of the red sandstone basement rock under the loess layer is weak, the structure is loose, the red sandstone basement rock is easy to soften when meeting water, disintegrates, has strong fluidity, and is easy to weather on the exposed ground surface. The red sandstone in the area is easy to expand, disintegrate, break, soften or argillize under the action of dry-wet circulation, the engineering stability is poor, the construction quality is difficult to control, and the red sandstone is a poor roadbed filling material. Various disease problems often occur in the built road, railway, side slope, tunnel and other projects, diseases such as uneven settlement and cracking are the common and prominent problems of the red sandstone filling subgrade, and the problems have extremely adverse effects on the safety and comfort of driving and the safe operation of underground pipelines. The main reasons for the occurrence of these diseases are that the red sandstone filler is not effectively treated before filling (for example, the red sandstone is not completely disintegrated), or the red sandstone filler is insufficiently compacted in filling construction engineering, or the roadbed sinks under the combined action of load, rainwater, pipeline water leakage and other factors after traffic is passed. Therefore, efficient and safe red sandstone high-fill road subgrade disposal structures are urgently needed to be proposed by researchers in the engineering technical field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high road roadbed structure of filling of red sandstone to solve the red sandstone road roadbed of filling and easily appear the problem of differential settlement and fracture.
The technical scheme of the utility model a red sandstone height fill road roadbed structure, its characterized in that: the roadbed comprises an undisturbed soil foundation treatment layer, a foundation composite geotextile, a high-fill roadbed backfill layer, a roadbed reinforcing impermeable layer, a embankment backfill layer, a roadbed backfill layer and a pavement structure layer which are sequentially arranged from bottom to top; a plurality of layers of dynamic compaction reinforcing layers are arranged at intervals in the backfill layer of the high fill roadbed, and a three-way geogrid in the roadbed is arranged at the top of each layer of dynamic compaction reinforcing layer.
As a further improvement, the bottom of the undisturbed soil foundation treatment layer is provided with a soil foundation dynamic compaction treatment layer.
As a further improvement of the utility model, roadbed backfill layer bottom is equipped with roadbed bottom composite geotextile, and roadbed backfill layer top is equipped with roadbed top three-way geogrid.
As a further improvement, the utility model discloses a municipal pipeline has been buried underground in the embankment backfill layer.
The beneficial effects of the utility model are that:
1. the utility model relates to a high fill road roadbed structure of red sandstone has improved high fill road roadbed overall mechanics performance of red sandstone, handles intraformational soil matrix dynamic compaction processing layer, high fill road bed backfill intraformational multilayer dynamic compaction strengthening layer and the road bed in three-dimensional geogrid, the seepage prevention layer is strengthened to the construction road bed that cement sand gravel soil laid simultaneously through setting up original state soil matrix, subsides, the deformation to high fill road roadbed of red sandstone have fine control effect to prevent that the road bed from sinking. The multi-layer dynamic compaction reinforcing layer is arranged in the backfill layer of the high fill roadbed, so that the compaction degree of a backfill soil body can be ensured, and the void ratio of the backfill soil body is reduced; the three-dimensional geogrid in the multilayer roadbed can avoid the uneven settlement of the high fill soil body as much as possible.
2. The utility model discloses respectively set up the compound geotechnological cloth of one deck in original state soil matrix processing layer top and roadbed backfill layer bottom, set up the road bed in the municipal administration pipeline below and strengthened the barrier layer, water-proof effects is good, has solved the red sandstone and has met the problem that the water is softened, has ensured road bed self bearing capacity and has eliminated the back of the worker of filling region and former red sandstone ground and subsided.
3. The utility model discloses a large amount of outward transportation of having avoided the red sandstone abandons the side, saves the engineering investment, and the construction is simple, the time limit for a project is short, and natural environment and social environment influence are little.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a construction flow chart of the first embodiment of the present invention;
fig. 3 is a layout diagram of main tamping points and auxiliary tamping points in the first embodiment of the present invention.
In the figure: 1 is an undisturbed soil base treatment layer; 1-1 is a soil substrate dynamic compaction treatment layer; 2 is a substrate composite geotextile; 3, a high fill roadbed backfill layer; 3-1 is a dynamic compaction reinforcing layer; 3-2 is a three-way geogrid in the roadbed; 4, a roadbed reinforced impervious layer; 5 is an embankment backfill layer; 5-1 is municipal pipeline; 6 is a roadbed backfill layer; 6-1 is a road bed bottom composite geotextile; 6-2 is a road bed top three-way geogrid; 7 is a pavement structure layer; 8 is an auxiliary tamping point; and 9 is a main tamping point.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a red sandstone high-fill road subgrade structure comprises an undisturbed soil foundation treatment layer 1, a base composite geotextile 2, a high-fill subgrade backfill layer 3, a subgrade reinforcement impermeable layer 4, a embankment backfill layer 5, a roadbed backfill layer 6 and a pavement structure layer 7 which are arranged from bottom to top in sequence; a plurality of layers of dynamic compaction reinforcing layers 3-1 are arranged in the high-fill roadbed backfill layer 3 at intervals, and a three-way geogrid 3-2 in the roadbed is arranged at the top of each layer of dynamic compaction reinforcing layer 3-1.
The bottom of the undisturbed soil base treatment layer 1 is provided with a soil base dynamic compaction treatment layer 1-1.
The bottom of the road bed backfill layer 6 is provided with a road bed bottom composite geotextile 6-1, and the top of the road bed backfill layer 6 is provided with a road bed top three-way geogrid 6-2.
Municipal pipelines 5-1 are buried in the embankment backfill layer 5.
Examples 1,
Fig. 2 shows a construction flow of the present embodiment.
The related experience of handling the road subgrade of the high fill of the red sandstone is not yet available in the Lanzhou economic technology development area, and the implementation of the utility model comprises the following steps:
s1, constructing an undisturbed soil base treatment layer 1: the surface cleaning thickness of the soil foundation is 40-60 cm, and the surface cleaning range is 3m outside the slope toe of the roadbed; then, a dynamic compaction machine is adopted to carry out dynamic compaction treatment on the soil foundation after the surface is cleaned to form a soil foundation dynamic compaction treatment layer 1-1, and the dynamic compaction treatment method comprises the following steps: the point ramming energy level adopts 4000KN · m-6000 KN · m, the point ramming is carried out for 10 times, the full ramming energy level adopts 1500KN · m-2000 kN · m, the point ramming is carried out at least twice, the full ramming is carried out at least once, when the point ramming is carried out, as shown in figure 3, a row of main ramming points 9 and a row of auxiliary ramming points 8 are alternately arranged, the distance D between the adjacent main ramming points 9 is 5-6 m, the distance D between the adjacent auxiliary ramming points 8 is 5-6 m, the distance between the corresponding ramming points during the full ramming is lapped by adopting the ramming stamp for 1/4 (for the round bottom ramming hammer, the lapping can be carried out according to 1/4 of the diameter of the ramming hammer), and the hammer withdrawing standard of the strong ramming is that the average ramming amount between the last two times is not more than 50mm; after the dynamic compaction is finished, the soil foundation is flattened by using a road roller, and then the surface cleaning range is backfilled, so that humus is removed on the layer, the bearing capacity of the soil foundation is enhanced, and the deformation resistance of the soil foundation is improved; the topographic soil base is prepared by mixing crushed red sandstone with plain soil with the mass fraction of 30-40%, and a layered backfilling and rolling process is adopted, wherein the backfilling thickness of each layer is not more than 30cm; the compaction degree of the undisturbed soil matrix treatment layer 1 is more than or equal to 92 percent;
s2, constructing a base composite geotextile 2: flattening and paving the base composite geotextile 2 above the construction undisturbed soil base treatment layer 1 to prevent underground water from permeating into the roadbed to cause softening of filled red sandstone and subsidence deformation of the roadbed;
s3, constructing a high fill roadbed backfill layer 3: the high fill roadbed backfill layer 3 is paved above the construction foundation composite geotextile 2 and adopts the crushed materialRed sandstone (with the grain diameter range of 0.075 mm-150 mm) mixed with 30% -40% of plain soil by mass fraction is backfilled and rolled layer by layer, the backfilling thickness of each layer is not more than 30cm, and a vibratory roller with the weight of more than 12 tons is adopted; performing tamping to form a dynamic compaction reinforcing layer 3-1 with a compaction level of 1000-2000 KN.m and a compaction degree of not less than 92% of the design and specification requirements every time when filling 4-6 m, and then flattening and paving a three-way geogrid 3-2 in the roadbed; the three-way geogrid 3-2 (with the specification of TX 190L) in the roadbed is transversely lapped by 20cm and longitudinally lapped by 30cm, the lapped part is anchored in 3 roadbed soil of a backfill layer of the high fill roadbed by adopting U-shaped steel bar nails, and the three-way geogrid 3-2 in the roadbed is longitudinally lapped by 0 0 ) Oblique (30) 0 ) Oblique direction (60) 0 ) Transverse direction (90) 0 ) The quality control tensile modulus of the mechanical property is more than or equal to 150KN/m under the strain of 2 percent;
s4, constructing a roadbed reinforced impervious layer 4: the roadbed reinforcing impervious layer 4 is paved above a high-fill roadbed backfill layer 3, the roadbed reinforcing impervious layer 4 is positioned at the bottom of a municipal pipeline 5-1 with the maximum buried depth of a road, is 4-6 m away from the bottom of a pavement structure layer 7, and is backfilled by cement, gravel and soil (the mass ratio of cement, gravel and soil is 8; the layered backfill compaction thickness is not more than 30cm, and the road roller adopts a vibratory roller of more than 12 tons; the compaction degree of the roadbed reinforced impervious layer (4) is more than or equal to 95 percent, and the unconfined compressive strength of the roadbed reinforced impervious layer (4) is more than or equal to 0.8MPa in 7 days; the arrangement of the construction roadbed reinforced impervious layer 4 improves the roadbed impervious effect and the roadbed bearing capacity, and ensures the stability of the red sandstone high fill road roadbed;
s5, constructing an embankment backfill layer 5: the embankment backfill layer 5 is paved above the roadbed reinforced impervious layer 4, and is backfilled and rolled layer by adopting the crushed red sandstone mixed with plain soil with the mass fraction of 30-40 percent, the particle size range of the crushed red sandstone is 0.075-100 mm, the crushed red sandstone has good gradation, and the backfilling compaction thickness of each layer is not more than 30cm; the road roller adopts a vibratory roller with the weight of more than 12 tons, and a small machine tool is adopted to compact the municipal pipeline within the range of 5-1 top 50cm; the compactness of the embankment backfill layer 5 is more than or equal to 93 percent, and the bearing capacity is more than or equal to 150Kpa; then, performing reverse excavation on the pipe trench, and burying a municipal pipeline 5-1; municipal pipelines 5-1 in the embankment backfill layer 5 are numerous, the compaction and backfill difficulty is high, additional stress exists in a working area of a road subgrade, and the compactness and the bearing capacity of the embankment backfill layer 5 are guaranteed, so that the requirement of the particle size range and the requirement of the compactness index of the crushed red sandstone are improved, and the integrity and the completeness of the subgrade range are guaranteed as much as possible;
s6, constructing a road bed backfill layer 6 and a road surface structural layer 7: flattening and paving a composite geotextile 6-1 at the bottom of the roadbed on the embankment backfill layer 5; a roadbed backfill layer 6 (with the thickness of 1.2 m) is paved above the roadbed bottom composite geotextile 6-1, and the crushed red sandstone is backfilled and rolled layer by using plain soil with the mass fraction of 70-80%, the particle size range of the crushed red sandstone is 0.075-100 mm, the crushed red sandstone has good gradation, and the backfilling compaction thickness of each layer is not more than 30cm; the road roller adopts a vibratory roller with the weight of more than 12 tons; the compactness of the road bed backfill layer 6 is more than or equal to 95 percent, and the bearing capacity is more than or equal to 160Kpa; flattening and paving a roadbed top three-way geogrid 6-2 at the top of the roadbed backfill layer 6, transversely overlapping the roadbed top three-way geogrid 6-2 (the specification is TX 190L) for 20cm and longitudinally overlapping the roadbed top three-way geogrid for 30cm, anchoring the overlapped part in the roadbed backfill layer 6 by adopting U-shaped steel bar nails, and longitudinally (0) overlapping the roadbed top three-way geogrid 6-2 0 ) Oblique direction (30) 0 ) Oblique direction (60) 0 ) Transverse direction (90) 0 ) The mechanical property is that the quality control tensile modulus is more than or equal to 150KN/m under 2 percent strain; and then paving a pavement structure layer 7. The roadbed backfill layer 6 serves as a direct work area of a roadbed, the requirement of the grain diameter range of broken red sandstones and the requirement of the compactness index are further improved, the bottom of the roadbed backfill layer 6 is provided with a roadbed bottom composite geotextile 6-1, the waterproof effect is guaranteed, and the top of the bottom of the roadbed backfill layer 6 is provided with a roadbed top three-way geogrid 6-2, so that the bearing capacity is improved, and the uneven settlement of the roadbed is controlled.
The foundation composite geotextile 2 and the road bed bottom composite geotextile 6-1 both adopt two cloths and one film, and the specification is 400 grams per square meter to 500 grams per square meter.
Claims (4)
1. The utility model provides a red sandstone height fill road roadbed structure which characterized in that: the soil foundation treatment layer comprises an undisturbed soil foundation treatment layer (1), a base composite geotextile (2), a high-fill roadbed backfill layer (3), a roadbed reinforcing impermeable layer (4), a embankment backfill layer (5), a roadbed backfill layer (6) and a pavement structure layer (7) which are sequentially arranged from bottom to top; multiple layers of dynamic compaction reinforcing layers (3-1) are arranged in the high-fill roadbed backfill layer (3) at intervals, and three-way geogrids (3-2) in the roadbed are arranged at the top of each layer of dynamic compaction reinforcing layer (3-1).
2. The roadbed structure of the red sandstone high-fill road, according to claim 1, is characterized in that: and a soil base dynamic compaction treatment layer (1-1) is arranged at the bottom of the undisturbed soil base treatment layer (1).
3. The roadbed structure of the red sandstone high fill road according to claim 1 or 2, wherein the roadbed structure comprises: the bottom of the roadbed backfill layer (6) is provided with roadbed bottom composite geotextile (6-1), and the top of the roadbed backfill layer (6) is provided with roadbed top three-way geogrid (6-2).
4. The roadbed structure of the red sandstone high fill road according to claim 3, which is characterized in that: municipal pipelines (5-1) are buried in the embankment backfill layer (5).
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| CN202221666228.0U CN218492175U (en) | 2022-06-30 | 2022-06-30 | Red sandstone high fill road subgrade structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115125782A (en) * | 2022-06-30 | 2022-09-30 | 中国市政工程西北设计研究院有限公司 | Red sandstone high-fill road subgrade structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115125782A (en) * | 2022-06-30 | 2022-09-30 | 中国市政工程西北设计研究院有限公司 | Red sandstone high-fill road subgrade structure and construction method |
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