CN213896585U - Fill roadbed structure suitable for water-rich low-lying permafrost region - Google Patents
Fill roadbed structure suitable for water-rich low-lying permafrost region Download PDFInfo
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- CN213896585U CN213896585U CN202021675483.2U CN202021675483U CN213896585U CN 213896585 U CN213896585 U CN 213896585U CN 202021675483 U CN202021675483 U CN 202021675483U CN 213896585 U CN213896585 U CN 213896585U
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Abstract
The utility model discloses a fill roadbed structure suitable for rich water low-lying perennial frozen soil district, including the slabstone strike roll layer, fill the slabstone layer, two cloth a membrane composite geomembranes, first gravel pave layer, road bed side slope toe heat preservation lane protection, anti-geotechnological cloth, second gravel pave layer, gravel bed course and road bed packing layer of straining. The impact rolling stone layer of the structure can improve the bearing capacity of the foundation, and simultaneously blocks underground water from rising to a roadbed soil body through the capillary water effect, so that the roadbed is ensured to be dry. And the flaky stone layer is filled, and natural air convection is formed by utilizing good gaps among the flaky stones in winter, so that the temperature of the permafrost can be actively reduced. Two waterproof layers with one film are laid to prevent water in the roadbed from seeping into the permafrost region, so that the permafrost degradation is accelerated. The water seepage geotextile and the gravel pavement layer have stronger drainage performance and are used as a drainage channel in the roadbed to effectively discharge the water inside the filled soil of the roadbed. The roadbed toe heat-insulating protective road prevents frost heaving diseases of the toe and blocks surface water of the toe from permeating into roadbed soil.
Description
Technical Field
The utility model belongs to perennial frozen soil area highway fill roadbed field, concretely relates to fill roadbed structure in water-rich low-lying perennial frozen soil area.
Background
Permafrost refers to soil (rock) that has a frozen state lasting two or more years. Frozen earth is extremely complex in nature and extremely temperature sensitive due to the presence of ice and unfrozen water. Along with the change of seasons, the soil body is subjected to repeated freeze-thaw cycles, so that the strength is greatly reduced, and adverse effects are caused to the construction and operation of highway engineering. The permafrost area of China is about 22 percent of the area of the national soil, and the permafrost roadbed diseases mainly cause the problems of roadbed frost heaving, thawing sinking and slurry turning caused by the deterioration of the permafrost, pavement cracking caused by the freeze thawing process and the like. In the water-rich low-lying permafrost region, the surface layer of a natural foundation is water-rich mucky soil to form a seasonal thawing layer soft foundation, the bearing capacity of the foundation is low, the lower part of the foundation is island-shaped permafrost, the thickness distribution is uneven, and the permafrost is easy to degrade due to the action of abundant surface water and underground water, so that the filling roadbed is thawed and swollen and the like.
Therefore, in order to solve the highway subgrade diseases in the water-rich low-lying permafrost region, a novel filling subgrade structure is urgently needed in engineering, the bearing capacity of the foundation is improved, the influence of surface water and underground water on the permafrost is effectively controlled, and measures are taken to protect the permafrost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fill roadbed structure suitable for rich water low-lying permafrost region can control surface water and groundwater to the influence of permafrost effectively, takes the measure protection permafrost.
The utility model provides a following technical scheme:
a fill roadbed structure suitable for a water-rich low-lying perennial frozen soil area comprises a rubble impact rolling layer 1, a filling rubble layer 2, a two-cloth one-film composite geomembrane 3, a first gravel laying layer 4, a roadbed slope toe heat preservation protective road 5, a reversed filtering geotextile 6, a second gravel laying layer 7, a gravel cushion layer 8 and a roadbed packing layer 9; the flaky stone impact rolling layer 1 is impacted and rolled into the ground (used for replacing and filling water-rich natural earth surface mucky soil), and the filling flaky stone layer 2 is laid on the flaky stone impact rolling layer 1 (used for protecting a low-lying frozen soil structure); the first gravel laying layer 4, the second gravel laying layer 7, the gravel cushion layer 8 and the roadbed packing layer 9 are sequentially laid on the bedding rubble layer 2; the roadbed side slope toe heat preservation guardrails 5 are filled on two sides of the filling rubble layer 2; lay two cloth one membrane composite geomembranes 3 between shim stone layer 2 and the first gravel pavement layer 4, lay between first gravel pavement layer 4 and the second gravel pavement layer 7 and counter-filter geotechnological cloth 6.
Furthermore, the stone impact rolling layer 1 is formed by impacting and rolling a piece of stone or a block of stone with the grain size smaller than 30cm into the ground, so that the bearing capacity of the foundation is improved, and capillary water is prevented from rising into the roadbed body.
Furthermore, the thickness of the filling sheet stone layer 2 is 0.5m, hard or harder rocks are adopted, the particle size is within the range of 10-25cm, the strength is not lower than 30MPa, the particle size is uniform, good pores are formed, and natural convection of air in the sheet stone layer (block stone layer) is ensured.
Further, the two cloth-one film composite geomembrane 3 has the mass per unit area not less than 500 g/square meter, the breaking strength not less than 15KN/m, the elongation at break less than 50 percent, the tearing strength not less than 0.6KN, the CBR bursting strength not less than 2.75KN/m, and the vertical permeability coefficient not more than 1 x 10-12cm/s。
Further, the first gravel pavement layer 4 is medium coarse sand with the thickness of 50cm
Further, the roadbed side slope toe heat preservation protective channel 5 is 4m in width, 1m in height and 1 in slope ratio: 1.5, adopting gravelly soil as a filler. The surface layer is made of local turf or tara grass with thickness not less than 30 cm.
Further, the mass per unit area of the reverse filtration geotextile 6 is not less than 400 g/square meter, the breaking strength is not less than 10KN/m, the breaking elongation is less than 50%, the tearing strength is not less than 0.25KN, the CBR bursting strength is not less than 2.75KN/m, and the vertical permeability coefficient is not less than 1 multiplied by 10- 2cm/s。
Further, the second gravel pavement 7 is medium coarse sand with the thickness of 50cm
Further, the gravel cushion layer 8 is medium coarse sand with the thickness of 30cm
Further, the roadbed packing layer 9 is a water-permeable or non-frost-heaving packing such as gravel soil or gravel.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a pair of fill roadbed structure suitable for rich water low-lying perennial frozen soil area, piece (piece) stone layer particle diameter of lower floor is less than 30cm, strikes and rolls the below ground of impressing, trades and fills out the natural earth's surface mucky soil of rich water, improves the ground bearing capacity, blocks simultaneously that groundwater rises to the road bed soil body through capillary water effect, guarantees that the road bed is dry. The filling layer of the stone layer with the thickness of 0.5m has even grain diameter, and good pores are formed among the stones, thereby ensuring that air in the stone layer forms natural convection in winter and actively reducing the temperature of the permafrost. Two water-impermeable layers with one film are laid on the surface of the filling sheet (block) stone layer to prevent water in the roadbed from infiltrating into the permafrost region, so that the deterioration of the permafrost is accelerated. The water seepage geotextile and the gravel pavement layer have stronger drainage performance and are used as a drainage channel in the roadbed to effectively discharge the water inside the filled soil of the roadbed. The roadbed toe heat-insulating protective road prevents frost heaving diseases of the toe and blocks surface water of the toe from permeating into roadbed soil.
Drawings
FIG. 1 is the utility model discloses a schematic diagram of fill roadbed structure suitable for water-rich low-lying permafrost region
The reference numbers in the drawings: 1. rubble strikes the rolling layer, 2, fills rubble layer, 3, two cloth a membrane composite geomembranes, 4, first gravel pave the layer, 5, road bed side slope toe heat preservation berm, 6, anti-geotechnological cloth of straining, 7, second gravel pave the layer, 8, gravel bed course, 9, road bed packing layer, 10, perennial frozen soil layer.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, a fill roadbed structure suitable for rich water low-lying permafrost region, including slice stone impact rolling layer 1, fill slice stone layer 2, two cloth one membrane compound geomembranes 3, first gravel pavements 4, road bed side slope toe heat preservation berm 5, anti-geotechnological cloth 6, second gravel pavements 7, gravel bed course 8, road bed packing layer 9 and permafrost layer 10. The thickness of the flaky stones impacting the rolling layer 1 is 1.5m, the grain size is smaller than 30cm, the muddy soil on the natural surface of the water-rich ground is filled, the bearing capacity of the foundation is improved, and meanwhile, underground water is prevented from rising to a roadbed soil body through the capillary water action. The thickness of the filling sheet stone layer 2 is 0.5m, the grain diameter is within the range of 10-25cm, the strength of the stone material is not lower than 30Mpa, the grain diameter is uniform, good pores are formed among the stone blocks, the natural convection of air in the sheet stone layer (block stone) in winter is ensured, and the temperature of the permafrost is actively reduced. The first gravel pavement layer 4 is medium coarse sand with the thickness of 50 cm. As a specific embodiment, between the filling rubble layer 2 and the first gravel pavement layer 4, two cloth-one film composite geomembrane 3 are laid, and two cloth-one film composite geomembrane are laidThe mass per unit area of the film 3 is not less than 500 g/square meter, the breaking strength is not less than 15KN/m, the breaking elongation is less than 50 percent, the tearing strength is not less than 0.6KN, the CBR bursting strength is not less than 2.75KN/m, and the vertical permeability coefficient is not more than 1 multiplied by 10-12cm/s. Roadbed side slope toe heat preservation berm 5, wide 4m, high 1m, slope ratio 1: 1.5, adopting gravelly soil as a filler. The filling degree should not be less than 93%, and the surface layer is made of local turf or Tartarian grass with thickness not less than 30 cm. The second gravel pavement 7 is 50cm thick. Laying a reverse filtration geotextile 6 between the first gravel laying layer 4 and the second gravel laying layer 7, wherein the mass per unit area of the reverse filtration geotextile is 400 g/square meter, the breaking strength is more than or equal to 10KN/m, the elongation at break is less than 50%, the tear strength is more than or equal to 0.25KN, the CBR bursting strength is more than or equal to 2.75KN/m, and the vertical permeability coefficient is more than or equal to 1 multiplied by 10-2cm/s. The gravel cushion layer 8 is medium coarse sand and has the thickness of 30 cm. The roadbed packing layer 9 is a water-permeable or non-frost heaving packing such as gravel soil or cobble stones.
The compactness of the roadbed packing layer 9 meets the requirements of highway roadbed design specification (JTC D30-2015). The critical height of the design of the roadbed in the permafrost region meets the design and construction technical rules of highways in the permafrost region (JTG/T D31-04-2012)
The utility model relates to a construction of fill roadbed structure suitable for rich water low-lying perennial frozen soil area includes following step:
and (5) removing the tree roots within the roadbed and cutting off the weeds on the ground.
The pressed stone (block) is impacted and rolled to 1 part below the ground, the thickness is 1.5m, the particle size of the stone (block) is less than 30cm, the muddy soil on the natural earth surface of the rich water is filled, the bearing capacity of the foundation is improved, and meanwhile, the underground water is prevented from rising to the soil body of the roadbed through the capillary water action.
Filling the stone layer 2 above the roadbed ground line, wherein the filling thickness is 0.5m, hard or harder rocks are adopted as the stone layer, the grain size is preferably controlled within the range of 10-25cm, and the stone strength is not lower than 30 Mpa. The surface layer of the flaky blocky stone is leveled in the full width range of the filled stone by selecting small blocky stones with proper particle sizes, and the side slope is piled and built by adopting hard flaky blocky stones. The block stone has even grain diameter and forms good pores, and ensures that the air in the block stone layer forms natural convection.
In the sheet (block) stone layerThe two cloth-one films 3 are laid on the top, the width is not less than 5m, the two cloth-one films are not too long when being laid at one time, and long-time exposure and exposure are avoided, so that the material property is deteriorated. The mass per unit area of the two cloth films and one film is not less than 500 g/square meter, the breaking strength is not less than 15KN/m, the breaking elongation is less than 50 percent, the tearing strength is not less than 0.6KN, the CBR bursting strength is not less than 2.75KN/m, and the vertical permeability coefficient is not more than 1 multiplied by 10-12cm/s。
And a first gravel paving layer 4 is filled on the two cloth films, namely one film and the other film, medium coarse sand with the thickness of 50cm is compacted by rolling.
Fill up roadbed side slope toe heat preservation berm 5, adopt the rubble soil as the filler, 4m wide, 1m high, the slope rate 1: 1.5, cultivating local turf or talagia on the surface layer, wherein the thickness is not less than 30cm, and the filling compactness is not less than 93%.
The first gravel laying layer 4 is laid with the reversed filter geotextile 6, the mass per unit area is 400 g/square meter, the breaking strength is more than or equal to 10KN/m, the breaking elongation is less than 50%, the tearing strength is more than or equal to 0.25KN, the CBR bursting strength is more than or equal to 2.75KN/m, and the vertical permeability coefficient is more than or equal to 1 multiplied by 10-2cm/s。
And paving a second gravel paving layer 7, wherein coarse sand is used, the thickness is 50cm, and the roller compaction is realized.
Paving a gravel cushion layer 8, medium coarse sand with the thickness of 30cm, and rolling and compacting.
And filling water-permeable or non-frost-heaving fillers such as gravel soil or cobble stones to serve as a roadbed packing layer 9 until the design height of the roadbed is reached, wherein the compactness of the roadbed packing layer meets the requirements of highway roadbed design Specifications (JTC D30-2015).
Claims (8)
1. The utility model provides a fill roadbed structure suitable for water-rich low-lying perennial frozen soil area which characterized in that: the device comprises a rubble impact rolling layer (1), a filling rubble layer (2), a two-cloth one-film composite geomembrane (3), a first gravel laying layer (4), a roadbed slope toe heat preservation protective road (5), reversed filtering geotextile (6), a second gravel laying layer (7), a gravel cushion layer (8) and a roadbed packing layer (9); the flaky stone impact rolling layer (1) is impacted and rolled below the ground, and the filling flaky stone layer (2) is laid on the flaky stone impact rolling layer (1); a first gravel laying layer (4), a second gravel laying layer (7), a gravel cushion layer (8) and a roadbed packing layer (9) are sequentially laid on the bedding rubble layer (2); the roadbed side slope toe heat preservation guardrails (5) are filled on two sides of the filling rubble layer (2); lay two cloth one membrane composite geomembranes (3) between rubble layer (2) of filling and the first gravel pavement (4), lay between first gravel pavement (4) and second gravel pavement (7) and counter-filter geotechnological cloth (6).
2. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the stone impact rolling layer (1) is formed by impacting and rolling a piece of stone or a block of stone with the grain diameter smaller than 30cm into the ground.
3. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the filling rubble layer (2) is a rock with the thickness of 0.5 m.
4. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the first gravel pavement (4) is medium coarse sand.
5. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: roadbed side slope toe heat preservation berm (5), slope ratio 1: 1.5, adopting gravelly soil as a filler; the surface layer is cultivated with turf or turfgrass, and the thickness is not less than 30 cm.
6. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the second gravel pavement (7) is medium coarse sand.
7. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the gravel cushion layer (8) is medium coarse sand.
8. The fill subgrade structure suitable for the water-rich low-lying permafrost areas according to the claim 1, characterized in that: the roadbed packing layer (9) is gravel soil or gravel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021675483.2U CN213896585U (en) | 2020-08-13 | 2020-08-13 | Fill roadbed structure suitable for water-rich low-lying permafrost region |
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| CN202021675483.2U CN213896585U (en) | 2020-08-13 | 2020-08-13 | Fill roadbed structure suitable for water-rich low-lying permafrost region |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370028A (en) * | 2021-11-18 | 2022-04-19 | 银川中铁水务集团有限公司 | A kind of laying method of geomembrane on breccia base |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370028A (en) * | 2021-11-18 | 2022-04-19 | 银川中铁水务集团有限公司 | A kind of laying method of geomembrane on breccia base |
| CN114370028B (en) * | 2021-11-18 | 2024-03-12 | 银川中铁水务集团有限公司 | Laying method of geomembrane on gravel soil substrate |
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