CN113250211A - Construction method for highway cutting slope in permafrost region - Google Patents
Construction method for highway cutting slope in permafrost region Download PDFInfo
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- CN113250211A CN113250211A CN202110495602.9A CN202110495602A CN113250211A CN 113250211 A CN113250211 A CN 113250211A CN 202110495602 A CN202110495602 A CN 202110495602A CN 113250211 A CN113250211 A CN 113250211A
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- 238000010276 construction Methods 0.000 title claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 105
- 239000004927 clay Substances 0.000 claims abstract description 46
- 239000002689 soil Substances 0.000 claims abstract description 44
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 238000004321 preservation Methods 0.000 claims abstract description 12
- 244000025254 Cannabis sativa Species 0.000 claims abstract description 8
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- 239000002356 single layer Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 239000004800 polyvinyl chloride Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- 239000012943 hotmelt Substances 0.000 abstract description 4
- 208000037921 secondary disease Diseases 0.000 abstract description 2
- 230000001934 delay Effects 0.000 abstract 1
- 201000010099 disease Diseases 0.000 description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 5
- 238000010257 thawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006806 disease prevention Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method of a highway cutting slope in permafrost regions, which comprises the steps of preparing a slope top intercepting ditch and temporary drainage facilities around the intercepting ditch; reserving a covering layer with a certain thickness on the excavation side slope, and finishing the excavation side slope to a designed slope surface after the excavation side slope reaches a normal construction season; backfilling a gravel cushion layer on the surface of the permafrost slope with high ice content after the square clearing and forming in warm seasons; tamping clay on the gravel cushion layer, and filling the gravel cushion layer by section from high to low; paving an XPS insulation board in the rammed clay layer, splicing the XPS insulation board in single-layer staggered joints, and fixing the XPS insulation board in the clay layer by adopting a U-shaped anchor; an arch skeleton protective layer is laid on the clay layer, planting soil is backfilled inside the clay layer, and grass seeds are sowed; the side slope foot is provided with a drainage seepage ditch, and the seepage ditch base is positioned below the side slope foot. The invention fully exerts the characteristics of good heat preservation and water insulation of clay layers, XPS heat preservation plates and vegetation, prevents or delays the degradation of frozen soil caused by the temperature rise of the frozen soil of the side slope for many years, reduces the occurrence of secondary diseases such as frost heaving, hot melt slumping and the like of the frozen soil side slope of the expressway in a cold region, and ensures the stability of the side slope.
Description
Technical Field
The invention relates to the technical field of roadbed slope protection, in particular to a construction method of a highway cutting slope in permafrost regions.
Background
The permafrost refers to soil (rock) with a frozen state lasting for two or more years, China is located in the third permafrost country around the world, the permafrost area accounts for about 22.3% of the area of the permafrost, and the permafrost is a main distribution area of the permafrost in China in mountains, Qinghai-Tibet plateaus and big and small Xinghan and AnLing areas in the northeast. Frozen earth is extremely complex in nature and extremely temperature sensitive due to the presence of ice and unfrozen water. In recent years, with the development of economy in cold regions, the requirements for the construction of traffic facilities in frozen soil regions are gradually improved, however, the construction of highways in permafrost regions is a worldwide problem, the degradation of permafrost causes great challenges to the stability of highway subgrades, and the transportation safety and later-period operation of highways are seriously affected.
Secondary diseases such as slope frost heaving, hot melt sliding collapse and the like are common to cutting slopes in permafrost regions, and the root cause is that the upper and lower limits of frozen soil fluctuate due to the temperature change of permafrost layers of the slopes caused by climate change or artificial interference. Excavating cutting in the perennial frozen soil area, and directly exposing the cutting and the perennial frozen soil in the side slope to the atmosphere to cause thermal fusion and slumping of the side slope in summer; during later highway operation, the water content of the soil body of the side slope is increased due to the perennial frozen soil degradation of the side slope, diseases such as ice hanging on the side slope, slobbering ice getting on the road and the like are formed, and the repeated freeze-thaw cycle of the side slope is also caused by the increase of the water content to seriously affect the stability of the side slope. The existing design principle is not mature for protecting the permafrost of the side slope, how to take measures to effectively prevent the disease problem of the frozen soil side slope in the cold region is solved fundamentally, and the processing technology capable of ensuring the stability of the cutting side slope in the cold region is to be perfected.
At present, the measure for treating the cutting slope in the permafrost region in engineering practice is to limit or delay fluctuation of upper and lower limits of permafrost by adopting heat preservation measures such as ramming and filling of cohesive soil and laying of turf, clay heat insulation layers are often large in replacement and filling thickness and inconvenient to construct, and heat preservation and heat insulation are often not up to requirements. In addition, the permafrost layer of the side slope is degraded to cause moisture migration in the side slope, and if the moisture is not led out of the side slope in time, the moisture remained in the side slope is subjected to repeated freeze thawing cycle, and diseases such as frost heaving, thaw settlement and the like of the side slope are necessarily induced. Therefore, a novel construction method for the cutting slope in the permafrost region is needed, the slope replacement and filling thickness is reduced, the requirement for thermal insulation of the slope is met, a drainage channel is formed in the slope, moisture in the slope is discharged in time, frost heaving and thaw collapse of the permafrost slope is avoided, and the stability of the slope is guaranteed.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a cutting slope construction method suitable for a perennial frozen soil area, which overcomes the perennial frozen soil exposure of a slope caused by cutting excavation, adopts heat preservation measures to limit or delay the fluctuation of the upper limit and the lower limit of the perennial frozen soil, protects the perennial frozen soil, solves the drainage problem of accumulated water in the slope, prevents the occurrence of diseases such as frost heaving and thawing of the slope and the like, ensures the stability and the durability of the slope, and enhances the stock performance of a perennial frozen soil highway in a cold area.
The technical scheme is as follows: the invention relates to a construction method of a highway cutting slope in permafrost regions, which comprises the following steps:
a. before formal excavation of the cutting, cutting slope top intercepting ditches and peripheral temporary drainage facilities are manufactured.
b. Excavating and forming the cutting in cold seasons, reserving a covering layer with a certain thickness and trimming the design slope after normal construction seasons without once excavating the excavation side slope to a design line;
c. backfilling a gravel cushion layer on the surface of the permafrost slope with high ice content after the square clearing and forming in warm seasons;
d. tamping and filling a first layer of tamping clay layer on the gravel cushion layer, and filling the gravel cushion layer section by section from high to low;
e. paving an XPS insulation board on the first ramming and filling clay layer, wherein the XPS insulation board is spliced by adopting single-layer staggered joints; fixing the XPS heat-insulation plate in the first layer of rammed clay layer by adopting a U-shaped anchor;
f. tamping a second layer of tamping clay layer on the XPS heat insulation board, paving an arched framework on the second layer of tamping clay layer as a protective layer of the slope, backfilling planting soil inside the arched framework, and broadcasting grass seeds in the planting soil in the arched framework;
g. and a drainage seepage ditch is arranged at the slope toe of the high-ice-content permafrost layer, and the substrate of the seepage ditch is positioned below the slope toe of the high-ice-content permafrost layer.
Wherein,
the cutting and slope excavation construction adopts cross-year operation, namely cold season excavation molding, and the warm season is backfilled in the next year, so that the cutting stability is ensured.
The side slope of digging a side in cold season must not dig the design line once, reserve the overburden of certain thickness, warm season is repaiied to design domatic 1: 1.5.
warm season backfill operation, backfill gravel cushion layer on the surface of high ice content permafrost slope, slope 1: 1.5, the grain diameter is not more than 5cm, and the thickness is 10 cm.
The clay layer is tamped to first layer on the gravel bed course, the slope is 1: 1.5, the thickness is not more than 50cm, the filling is performed section by section from high to low, and the filling is tamped in time after the filling, so that the heat preservation of the side slope is facilitated.
The XPS heated board is laid in first layer tamped clay layer, and the XPS heated board adopts the concatenation of individual layer alternate joint, adopts U type anchor nail to fix in first layer tamped clay layer, and XPS heated board size adopts 200cm x 100cm x 5cm in unison. And then laying a second layer of ramming clay layer.
The arched frameworks are laid on the second layer of ramming and filling clay layer, the height of the arched frameworks is 2-2.5m, the longitudinal distance is 2-3m, planting soil is backfilled inside the arched frameworks, and grass seeds are sowed.
The drainage seepage ditch is arranged at the slope foot of the cutting slope, the seepage ditch base is positioned below the slope foot, and a polyvinyl chloride plastic pipe with holes is arranged in the seepage ditch and filled with broken stones or gravels.
Has the advantages that: according to the invention, through reasonably selecting the construction time of the cutting slope, fully combining a simple and feasible replacement and filling method and a heat preservation method, and arranging the drainage channel in the slope, the problems of degradation of permafrost soil of the cutting slope in a cold region and the like are comprehensively solved. The method utilizes the characteristics of good heat preservation and water insulation of clay layers, XPS heat preservation plates and vegetation to prevent or delay the degradation of frozen soil caused by the temperature rise of the frozen soil of the side slope for many years; the drainage channel formed by the gravel cushion layer and the drainage seepage ditch together timely drains accumulated water formed by the degradation of frozen soil in the side slope out of the side slope, reduces the water content of the soil body of the side slope, reduces the occurrence of diseases such as hot melt sliding collapse, frost heaving and the like of the frozen soil side slope, and ensures the stability of the side slope. The construction method realizes the disease prevention of the cutting slope in the permafrost region, fundamentally limits the problems of frost heaving, hot melt slumping and the like of the cutting slope, improves the stability and durability of the roadbed, and directly enhances the service performance of the expressway in the permafrost region.
Drawings
Fig. 1 is a schematic diagram of a cutting slope construction method suitable for a perennial frozen soil area.
In the figure, 1, a gravel cushion layer, 21, a first layer of rammed clay layer, 22 a second layer of rammed clay layer, 3, an XPS heat preservation plate, 4, an arched framework, 5, a side ditch, 6, a seepage ditch, 7, a pavement, 8, a perennial frozen soil layer with high ice content, 9, an upper limit of frozen soil, 10 and a ground line.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
Example 1
A cutting slope construction method suitable for permafrost regions, as shown in figure 1. The method is characterized by comprising the following steps:
a. before formal excavation of the cutting, a cutting slope top intercepting ditch and peripheral temporary drainage facilities are manufactured, the intercepting ditch is arranged 5M outside the slope top, a rectangular section is adopted, and M10 grouted rubble is built, the depth is 40cm, the width is 40-60cm, and the thickness is 30 cm.
b. Determining the position of an excavation line according to the cutting design section; selecting a proper excavation method according to the height of an excavated part, site conditions and the like, and transversely pushing the available loose part of the earth surface to be outside the excavation limit of 30m at the cut side; the upper limit is below the ice layer containing soil or frozen soil full of ice, and the soil is pushed out from the proper place outside the cutting by adopting a method of longitudinal one-time pushing out or sectional pushing out of a transverse channel according to the length of the cutting.
c. Constructing in cold seasons, reserving a 50cm thick covering layer without digging a design line on the excavation side slope at one time, and finishing the design slope after normal construction seasons;
d. backfilling a gravel cushion layer on the surface of the permafrost side slope with high ice content after the warm season square clearing forming, wherein the grain diameter is not more than 5cm, the thickness is 10cm, the gravel cushion layer is spread along the side slope from two sides during backfilling, and then the gravel cushion layer is conveyed to a substrate layer by layer to be beneficial to heat preservation of the side slope; the filler is tamped in time after being thrown.
e. And (3) tamping clay on the gravel cushion layer, wherein the thickness of the clay is 50cm, the clay is filled section by section from high to low, and the clay is tamped layer by layer.
f. An XPS heat-insulating layer is laid in the rammed clay layer and spliced by single-layer staggered joints of heat-insulating plates with the sizes of 200cm multiplied by 100cm multiplied by 5cm, and the heat-insulating layers are fixed in the clay layer by U-shaped anchors.
g. An arch skeleton protective layer is laid on the clay layer, the height of the arch skeleton is 2-2.5m, the longitudinal distance is 2-3m, planting soil is filled in the arch skeleton, and grass seeds are sowed.
h. The side slope foot is provided with a drainage seepage ditch, the seepage ditch base is positioned below the side slope foot, a polyvinyl chloride perforated plastic pipe is arranged in the seepage ditch, and broken stones or gravel are filled in the plastic pipe.
A cutting slope structure suitable for permafrost regions comprises a sand cushion layer 1, a rammed clay layer 2, an XPS heat-insulating plate 3, an arched framework 4, a side ditch 5 and a seepage ditch 6; a slope surface of a perennial frozen soil layer 8 with high ice content is applied with a sand cushion layer 1, the sand cushion layer 1 is applied with a first ramming and filling clay layer 21, the first ramming and filling clay layer 21 is anchored with an XPS heat insulation board 3, and then a second ramming and filling clay layer 22 is applied; the arch-shaped framework 4 is placed on the second layer of ramming and filling clay layer 22 for fixing.
Furthermore, a slope toe of the permafrost layer 8 with high ice content, which is connected with the road surface 7, is constructed as a side ditch 5 and an infiltration ditch 6. The infiltration ditch 6 is internally provided with a polyvinyl chloride plastic pipe with holes and filled with broken stones or gravels.
Further, the measurement of the pay-off is carried out on the ground line 10; and a slope top soil retaining pile is filled on the ground line.
Furthermore, planting soil of grass seeds is filled in the arched framework 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A construction method of a freeway cutting slope in permafrost regions comprises the following steps:
a. before formal excavation of cutting of a perennial frozen soil layer with high ice content, cutting slope top intercepting ditches and peripheral temporary drainage facilities are manufactured;
b. excavating and forming the cutting in cold seasons, reserving a covering layer with a certain thickness on the excavated slope, and finishing the designed slope surface after normal construction seasons;
c, backfilling a gravel cushion layer on the surface of the permafrost slope with high ice content after square clearing and forming in warm seasons;
d. tamping and filling a first layer of tamping and filling clay layer on the gravel cushion layer, wherein the first layer of tamping and filling clay layer is filled section by section from high to low;
e. paving an XPS heat insulation board on the first layer of rammed clay layer, splicing the XPS heat insulation boards by adopting single-layer staggered joints, and fixing the XPS heat insulation boards in the first layer of rammed clay layer by adopting U-shaped anchors;
f. tamping a second layer of tamping clay layer on the XPS heat insulation board, paving an arched framework on the second layer of tamping clay layer as a protective layer of the slope, backfilling planting soil inside the arched framework, and broadcasting grass seeds in the planting soil in the arched framework;
g. and a drainage seepage ditch is arranged at the slope toe of the high-ice-content permafrost layer, and the substrate of the seepage ditch is positioned below the slope toe of the high-ice-content permafrost layer.
2. The method according to claim 1, wherein the cutting and slope construction is carried out in a cross-year manner, namely excavation and forming in cold seasons, and backfilling in warm seasons in the coming year, so as to ensure the stability of the cutting.
3. The construction method of a permafrost region expressway cutting slope according to claim 1, characterized in that a cold-season excavation slope is re-finished to a design slope surface 1 after being warmed: 1.5.
4. the method for constructing the freeway cutting slope in the permafrost region according to claim 1, wherein backfilling operation is carried out in warm seasons, and gravel cushion layers are backfilled on the surface of the permafrost slope with high ice content, wherein the grain diameter is not more than 5 cm.
5. The method for constructing the highway cutting slope in the permafrost region according to claim 1, wherein clay is tamped on a gravel cushion layer, and the gradient is 1: 1.5, the thickness is not more than 50cm, the filling is performed section by section from high to low, and the filling is tamped in time after the filling, so that the heat preservation of the side slope is facilitated.
6. The method for constructing a highway cutting slope in permafrost regions according to claim 1, wherein XPS insulation boards are laid in rammed clay layers, and are spliced in a single-layer staggered joint mode and fixed in the clay layers by U-shaped anchors.
7. The method for constructing a highway cutting slope in permafrost regions according to claim 1, wherein an arch-shaped framework protective layer is laid on the clay layer, the height of the arch-shaped framework is 2-2.5m, the longitudinal distance is 2-3m, planting soil is backfilled in the arch-shaped framework, and grass seeds are sowed.
8. The method for constructing a highway cutting slope in permafrost regions according to claim 1, wherein a drainage seepage ditch is arranged at the toe of the cutting slope, the base of the seepage ditch is positioned below the toe of the slope, a polyvinyl chloride plastic pipe with holes is arranged in the seepage ditch, and crushed stone or gravel is filled in the plastic pipe.
9. The utility model provides a cutting slope structure suitable for permafrost region which characterized in that: a sand cushion layer (1) is applied on the slope of the perennial frozen soil layer (8) with high ice content, a first ramming and filling clay layer (21) is applied on the sand cushion layer (1), an XPS heat insulation board (3) is anchored on the first ramming and filling clay layer (21), and then a second ramming and filling clay layer (22) is applied; an arch-shaped framework (4) is placed on the second layer of ramming and filling clay layer (22) for fixing.
10. The cutting slope structure suitable for permafrost regions according to claim 9, wherein: constructing a side ditch (5) and an infiltration ditch (6) at the slope toe position where the high-ice-content permafrost layer (8) is connected with the road surface (7); a polyvinyl chloride plastic pipe with holes is arranged in the infiltration ditch (6), and broken stones or gravel are filled in the infiltration ditch;
carrying out unwrapping wire measurement on the ground line (10); a slope top soil retaining pile is filled on the ground line (10); the inside of the arched framework (4) is backfilled with planting soil of grass seeds.
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| CN202110495602.9A CN113250211A (en) | 2021-05-07 | 2021-05-07 | Construction method for highway cutting slope in permafrost region |
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Cited By (3)
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| CN114318993A (en) * | 2021-12-24 | 2022-04-12 | 东北林业大学 | Cold region highway cutting slope interlayer water disease treatment method |
| CN115627782A (en) * | 2022-10-19 | 2023-01-20 | 中南大学 | Nail seam type reinforcing structure for building slope of sloping field landform fill embankment and construction method |
| CN116905301A (en) * | 2023-09-07 | 2023-10-20 | 中交第一航务工程局有限公司 | Deep cutting construction method |
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| CN116905301A (en) * | 2023-09-07 | 2023-10-20 | 中交第一航务工程局有限公司 | Deep cutting construction method |
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