CN112160208A - Filling roadbed construction method suitable for water-rich low-lying permafrost region - Google Patents
Filling roadbed construction method suitable for water-rich low-lying permafrost region Download PDFInfo
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- CN112160208A CN112160208A CN202010809639.XA CN202010809639A CN112160208A CN 112160208 A CN112160208 A CN 112160208A CN 202010809639 A CN202010809639 A CN 202010809639A CN 112160208 A CN112160208 A CN 112160208A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a fill roadbed construction method suitable for a water-rich low-lying permafrost region, which comprises the following steps: carrying out compaction and filling replacement construction on the punched rubbles; filling a rubble layer cooling layer; laying two cloth films and one film; paving a gravel layer; constructing a roadbed slope toe heat preservation protection road; laying a reverse filtering geotextile; paving a gravel layer; paving a gravel cushion layer; the roadbed filling material with compact filling and good water permeability is filled. According to the method, the impact rolling rubble layer is utilized to squeeze silt and replace filling, so that the bearing capacity of the foundation is improved, and meanwhile, underground water is prevented from rising to a roadbed soil body through the action of capillary water, and the roadbed is ensured to be dry; filling a rubble cooling layer, and forming natural air convection by using good gaps among the rubbles in winter, so that the temperature of the permafrost can be actively reduced; laying two cloth-one film impervious layers to prevent water in the roadbed from infiltrating into a permafrost region; the water seepage geotextile and the gravel paving layer have stronger water drainage, and the roadbed toe heat-insulation protective channel prevents frost heaving diseases of the toe and blocks surface water of the toe from permeating into the roadbed soil body.
Description
Technical Field
The invention belongs to the technical field of roadbed construction, and particularly relates to a construction method of a fill roadbed in a water-rich low-lying permafrost region.
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.
Aiming at the problems, the invention provides a construction method of a fill subgrade suitable for a water-rich low-lying permafrost region, which improves the bearing capacity of a foundation, effectively controls the influence of surface water and underground water on the permafrost, and takes measures to protect the permafrost.
Disclosure of Invention
The invention aims to provide a construction method of a fill roadbed suitable for a water-rich low-lying permafrost region. In the water-rich low-lying permafrost region, the surface layer is a water-rich soft foundation, and the lower layer is permafrost. The impact rolling rubble layer is utilized to squeeze silt and change filling, so that the bearing capacity of the foundation is improved, and simultaneously, underground water is prevented from rising to a roadbed soil body through the capillary water effect, and the dryness of the roadbed is ensured. The lower layer of the permafrost is large in thickness, a protection principle is adopted, a rubble cooling layer is filled, and natural air convection is formed by utilizing good gaps among the rubbles in winter, so that the temperature of the permafrost can be actively reduced, and the degradation of the permafrost is reduced; and two water-impermeable layers with one film are laid to prevent water in the roadbed from seeping into the permafrost region. The water seepage geotextile and gravel laying layer have strong drainage performance and are used as a drainage channel in the roadbed to effectively discharge the water in 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.
A construction method suitable for filling roadbed in water-rich low-lying permafrost region comprises the following steps:
the method comprises the following steps: 1, pressing and silt-squeezing replacement filling construction of a flaky stone;
step two: a filling rubble layer 2;
step three: laying two cloth films 3;
step four: paving a gravel layer 4 with the thickness of 50 cm;
step five: roadbed slope toe heat preservation protection road construction 5
Step six: laying a reverse filtering geotextile 6;
step seven: paving 50cm of gravel 7;
step eight: laying 30cm of gravel 8;
step nine: filling compact embankment filling soil 9 with good water permeability;
step one, impact rubble silt squeezing and filling replacing construction 1:
(1) and clearing the table before filling: removing tree roots, cutting off weeds and removing surface humus;
(2) in the water-rich low-lying areas where the roadbed is located, the number of soft foundations is large, the stone is pushed forward by a high-power bulldozer according to the principle that horizontal layering is low firstly and then high during filling, and preliminary compaction among the stone is facilitated.
(3) Paving larger-grain-size stones firstly, placing the stones with large faces downward and small faces upward separately, flatly placing the stones stably, leveling the stones by using small stones, filling gaps on the surface of each layer by using gravel soil and stone chips, checking the uniformity of fillers at any time, and ensuring that the interiors are compact and have no cavities.
(4) And the filling thickness of the stone material at the strong filling section is not more than 40cm, and the road roller is pressed into the ground and is rolled and tamped.
(5) And during rolling, the rolling is performed from two sides to the middle, then from the middle to two sides, the super high section is started from the lower side, then the rolling is performed gradually to the higher side, the compacting routes are longitudinally parallel, the rolling speed is fast first and then slow, the rolling speed is controlled to be 2.0-4.0Km/h, the frequency is 30Hz, the first time and the last time are static pressure, and the rest is strong vibration rolling, so that no pressure leakage and no dead angle are realized.
Step two, filling the rubble layer 2 and constructing:
(1) the material requirements are as follows: hard or harder rock is adopted as the flaky lump stone, the grain size is preferably controlled within the range of 10-25cm, and the strength of the stone is not lower than 30 MPa.
(2) The rubble is laid on the roadbed ground line.
(3) The filling thickness is 0.5m, the surface layer of the block stone is leveled in the full width range of the filling stone by selecting small block stones with proper grain diameters, and the side slope is piled and built by adopting hard block stones. Small stones are strictly forbidden to be filled among the pieces of stones, and ventilation gaps are guaranteed.
(4) And (3) adopting an impact type road roller, rolling for not less than 6 times, overlapping between longitudinal rows of rolling for not less than 0.5m, and overlapping between front and rear adjacent sections for not less than 2.0 m.
Step three, laying two cloth films and one film 3:
two cloth films are laid on the lamellar stone layer, the width is not less than 5m, and the two cloth films are not suitable to be overlong once laid, so that the width is not less than 5mThe product can be used for preventing long-term exposure and deterioration of material properties. The mass per unit area is not less than 500 g/square meter, the breaking strength is not less than 15KN/m, the elongation at break 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 fourthly, paving a 50 cm-thick gravel layer 4, and performing layered rolling and filling.
Step five, roadbed slope toe heat preservation guardrail construction 5
Adopting gravelly soil as filler, wherein the width is 4m, the height is 1m, and the slope ratio is 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%.
Laying the reverse filtration geotextile 6, wherein 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 percent, 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 seventhly, paving a 50cm gravel cushion layer 7, and carrying out layered rolling compaction.
And step eight, laying a 30cm gravel cushion layer 8, and carrying out layered rolling compaction.
And step nine, filling water-permeable embankment fillers 9, wherein the water-permeable or non-frost-heaving fillers such as gravel soil or cobble stones are selected as the materials, the mud content is less than or equal to 15%, the water content is not more than the optimal water content + 2%, and the 16t impact type road roller is used for pressure supplementing when 3-4 layers are filled.
Compared with the prior art, the invention has the following technical effects. :
(1) the flaky stones 1 are punched below the ground surface to replace and fill the water-rich natural ground surface mucky soil, so that 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 effect, and the roadbed is ensured to be dry.
(2) And filling the rubble layer 2, and actively cooling the permafrost 10 under the roadbed. The air in the rubble layer forms natural convection in winter, so that the external cold energy is transmitted to the foundation to reduce the temperature of the permafrost and reduce the degradation of the permafrost.
(3) Two films 3 are laid to prevent water in the roadbed body from infiltrating into the permafrost region to accelerate the deterioration of the permafrost.
(4) The roadbed toe heat-insulating protective road 5 is constructed to prevent frost heaving diseases of the toe and prevent surface water of the toe from permeating into the roadbed soil body.
(5) The water seepage geotextile 6 and the gravel laying layer have stronger drainage performance and are used as a drainage channel in the roadbed to effectively discharge the water in the filled soil of the roadbed.
Drawings
FIG. 1 is a block diagram of the present invention.
The labels in the figure are: 1-impact rolling of filling sheet (block) stone into ground, 2-filling sheet stone, 3-laying two layers of a film, 4-first gravel layer, 5-protective road heat-insulating layer, 6-reverse filtering geotextile, 7-second gravel layer, 8-third gravel layer and 9-roadbed packing layer
Detailed Description
A roadbed construction method suitable for a water-rich low-lying permafrost region comprises the following specific implementation steps:
the method comprises the following steps: pressing sheet stone silt-squeezing and filling-changing construction 1
(1) Removing the surface before filling, namely removing the roots of the trees, cutting off weeds and removing the humus on the surface layer
(2) In the water-rich low-lying areas where the roadbed is located, the number of soft foundations is large, the stone is pushed forward by a high-power bulldozer according to the principle that horizontal layering is low firstly and then high during filling, and preliminary compaction among the stone is facilitated.
(3) Paving larger-grain-size stones firstly, placing the stones with large faces downward and small faces upward separately, flatly placing the stones stably, leveling the stones by using small stones, filling gaps on the surface of each layer by using gravel soil and stone chips, checking the uniformity of fillers at any time, and ensuring that the interiors are compact and have no cavities.
(4) And the filling thickness of the stone material at the strong filling section is not more than 40cm, and the road roller is pressed into the ground and is rolled and tamped.
(5) And during rolling, the rolling is performed from two sides to the middle, then from the middle to two sides, the super high section is started from the lower side, then the rolling is performed gradually to the higher side, the compacting routes are longitudinally parallel, the rolling speed is fast first and then slow, the rolling speed is controlled to be 2.0-4.0Km/h, the frequency is 30Hz, the first time and the last time are static pressure, and the rest is strong vibration rolling, so that no pressure leakage and no dead angle are realized.
Step two: filling rubble 2
(1) The material requirements are as follows: the flaky stone is hard or harder rock, the grain size is preferably controlled within the range of 10-25cm, and the stone strength is not lower than 30 MPa.
(2) The rubble is laid on the roadbed ground line.
(3) The filling thickness is 0.5m, small stones with proper particle sizes are selected for the surface layer of the stone chips to be leveled in the full-width range of the filled stone, and hard stone chips are adopted for side slope stacking. Small stones are strictly forbidden to be filled among the pieces of stones, and ventilation gaps are guaranteed.
(4) And (3) adopting an impact type road roller, rolling for not less than 6 times, overlapping between longitudinal rows of rolling for not less than 0.5m, and overlapping between front and rear adjacent sections for not less than 2.0 m.
Step three: laying two cloths and one film 3
Two cloth one films are laid on the sheet stone layer, the width is not less than 5m, the two cloth one films are not suitable to be overlong when the two cloth one films are laid at one time, and the long-time insolation and exposure are avoided, so that the material property is deteriorated. The basic index requirements are as follows: the vertical permeability coefficient is not more than 1 x 10-11cm/s, the breaking strength is not less than 20KN/m, the CBR bursting strength is not less than 2.5KN, the film thickness is not less than 0.35mm, and the maximum elongation is less than 30%.
Step four: and paving a 50cm thick gravel layer 4, and performing layered rolling and filling.
Step five: roadbed slope toe heat preservation protection road construction 5
Adopting gravelly soil as filler, wherein the width is 4m, the height is 1m, and the slope ratio is 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%.
Step six: laying the anti-filtration geotextile 6, wherein 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 percent, 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
Step seven: and paving a 50cm gravel cushion layer 7, and carrying out layered rolling compaction.
Step eight: laying a 30cm gravel cushion layer 8, and carrying out layered rolling compaction.
And step nine, filling water-permeable embankment fillers 9, wherein the water-permeable or non-frost-heaving fillers such as gravel soil or cobble stones are selected as the materials, the mud content is less than or equal to 15%, the water content is not more than the optimal water content + 2%, and the 16t impact type road roller is used for pressure supplementing when 3-4 layers are filled.
Claims (10)
1. A filling roadbed construction method suitable for a water-rich low-lying permafrost region is characterized by comprising the following steps:
the method comprises the following steps: carrying out compaction and filling replacement construction on the punched rubbles;
step two: filling a rubble cooling layer;
step three: laying two cloth films and one film;
step four: paving a thick gravel layer;
step five: constructing a roadbed slope toe heat preservation protection road;
step six: laying a reverse filtering geotextile;
step seven: paving a gravel layer;
step eight: paving a gravel layer;
step nine: and filling compact embankment filling with good water permeability.
2. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized in that the first step: the construction process of pressing the pressed rubble to remove silt and fill is as follows,
(1) and clearing the table before filling: removing tree root, cutting off weed, and removing surface humus
(2) In the water-rich low-lying areas where the roadbed is located, the soft ground is more, and the stones are pushed forwards by a high-power bulldozer according to the principle that horizontal layering is firstly low and then high during filling, so that preliminary compaction among the stones is facilitated;
(3) paving stones with larger grain sizes, placing the stones separately and stably with large faces downward and small faces upward, leveling the stones by using small stones, filling gaps on the surface of each layer by using gravel soil and stone chips, checking the uniformity of the filler at any time and ensuring that the interior is compact and has no cavity;
(4) the stone filling thickness of the strong filling section is not more than 40cm, and the road roller is pressed into the ground and is rolled and tamped;
(5) when rolling, the rolling is carried out from two sides to the middle, then from the middle to two sides, the super high section is rolled from the lower side and then gradually to the higher side, the compaction routes are longitudinally parallel, the rolling speed is fast firstly and then slow, the first rolling and the last rolling are static pressure, and the rest is strong vibration rolling, so that no pressure leakage and no dead angle are realized.
3. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized in that the second step: the process of constructing the heat-insulating layer by filling rubble is as follows,
(1) hard or harder rock is adopted, the grain size is controlled within the range of 10-25cm, and the strength of the stone is not lower than 30 Mpa;
(2) the piece stones are laid above the roadbed ground line;
(3) filling thickness is 0.5m, small-particle-size stones are selected on the surface layers of the stones and leveled in the full-width range of the filled stones, and hard stone blocks are adopted for side slope stacking; small stones are strictly forbidden to be filled among the pieces of stones, so that ventilation gaps are ensured;
(4) and (3) adopting an impact type road roller, rolling for not less than 6 times, overlapping between longitudinal rows of rolling for not less than 0.5m, and overlapping between front and rear adjacent sections for not less than 2.0 m.
4. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized by comprising the following steps: laying two or one film, the mass per unit area 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。
5. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized by comprising the following steps: and paving a thick gravel layer, and carrying out layered rolling and filling.
6. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized by comprising the following steps: the roadbed side slope toe heat preservation protection construction adopts the gravel soil as the filler, and the slope ratio is 1: 1.5, cultivating local turf or turfgrass on the surface layer.
7. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized in that the method comprises the following six steps: laying the anti-filtration geotextile, wherein 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 percent, 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。
8. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized in that the method comprises the following seven steps: laying a gravel cushion layer, and carrying out layered rolling compaction.
9. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized in that the method comprises the following eight steps: laying a gravel cushion layer, and carrying out layered rolling compaction.
10. The method for constructing a roadbed in a water-rich low-lying permafrost region, according to claim 1, is characterized by comprising the following nine steps: and filling compact embankment filling with good water permeability.
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| CN114960551A (en) * | 2022-05-27 | 2022-08-30 | 武汉一冶建筑安装工程有限责任公司 | Method for treating superficial landslide of local bank slope |
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| CN114775350A (en) * | 2022-03-23 | 2022-07-22 | 广西大学 | A comprehensive treatment method for silt roadbed with low liquid limit |
| CN114960551A (en) * | 2022-05-27 | 2022-08-30 | 武汉一冶建筑安装工程有限责任公司 | Method for treating superficial landslide of local bank slope |
| CN114960551B (en) * | 2022-05-27 | 2023-06-06 | 武汉一冶建筑安装工程有限责任公司 | Processing method for local bank slope to generate superficial landslide |
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Application publication date: 20210101 |