CN218561969U

CN218561969U - Rigidity enhancing structure for clay road foundation in seasonal frozen region

Info

Publication number: CN218561969U
Application number: CN202222911335.1U
Authority: CN
Inventors: 成铭; 刘文涛; 李爽; 骆行文; 卢正; 詹永祥; 赵阳
Original assignee: Jilin Provincial Transport Scientific Research Institute; Wuhan Institute of Rock and Soil Mechanics of CAS
Current assignee: Jilin Provincial Transport Scientific Research Institute; Wuhan Institute of Rock and Soil Mechanics of CAS
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-03-03
Anticipated expiration: 2032-11-02

Abstract

The application discloses a rigidity enhancing structure for a clay roadbed in a monsoon freezing region, which comprises a clay roadbed base body, a heat insulation layer and a rigidity enhancing layer, wherein the heat insulation layer is positioned on the surface of the clay roadbed base body so as to prevent the clay roadbed from melting and sinking due to the freezing of water in the clay roadbed; the rigidity reinforcing layer is positioned on the surface of the heat-insulation layer, which is away from the clay roadbed matrix, so that the rigidity of the clay roadbed is enhanced; wherein the stiffness enhancing layer comprises geocells filled with clay to diffuse additional loads transmitted by vehicles; the geocell and the heat-insulating layer are combined to act, so that the rigidity of the clay roadbed can be enhanced, the reduction of the rigidity of the clay roadbed caused by the freezing-thawing circulation action of the seasonal freezing area can be prevented, and the purpose of reducing the deformation of the clay roadbed is achieved.

Description

Rigidity enhancing structure for clay road foundation in seasonal frozen region

Technical Field

The application relates to the technical field of roadbed engineering, in particular to a rigidity enhancing structure for a seasonally frozen region clay roadbed.

Background

China is vast in regions and large in span range, and the area of a frozen season area accounts for about half of the area of the whole country. The phenomena of frost heaving and thaw collapse of the roadbed in the seasonal frozen region are quite common due to the change of the atmospheric temperature. For a clay subgrade, the phenomena of frost heaving and thaw collapse are particularly obvious. Frost heaving and thaw collapse often cause damage to the roadbed structure. In addition, the rigidity of the clay road foundation is not large, and the rigidity of the clay road foundation can be continuously reduced due to the long-term freeze-thaw cycle effect, so that the clay road foundation is not high in rigidity, and the clay road foundation can be gradually subjected to non-uniform settlement deformation under the vehicle load effect, so that the road surface flatness is reduced, even the road surface structure is damaged, and the driving safety is seriously influenced. In order to ensure that the clay roadbed in the seasonal freezing area has enough rigidity and reduce the influence of freezing and thawing cycles on the rigidity of the clay roadbed, the invention discloses a rigidity enhancing structure of the clay roadbed in the seasonal freezing area.

The existing roadbed rigidity enhancing method mainly comprises the following steps: dynamic compaction, physical and chemical methods. The dynamic compaction method is that a rammer with certain mass is lifted to a certain height and then freely falls down to tamp the roadbed soil layer, so as to achieve the purposes of reinforcing the soil layer and improving the rigidity of the roadbed, and the construction period of the method is longer. The physical method is that coarse grains (such as sand, gravel and the like) are mixed into roadbed filling before roadbed filling, then road mixing is carried out, and finally a road roller is adopted for on-site rolling compaction, so that the rigidity of the roadbed is improved. The chemical reinforcing method is to add additives (such as cement, lime, etc.) into the roadbed filler, then to mechanically mix, finally to transport to the roadbed site, to use a road roller to compact, thus to improve the rigidity of the roadbed. Both physical method and chemical method have long construction period and high cost.

The current method for preventing and controlling the freezing injury of the roadbed mainly comprises the following steps: a packing method and a water-proof method. The filling method is to fill the frost heaving soil into non-frost heaving soil for roadbed filling. Although the method is a reliable measure for treating the frost damage of the roadbed, the construction period is long, in addition, the amount of non-frost heaving soil required by the replacement and filling method is huge, enough soil sources along the roadbed are difficult to ensure, great limitation exists in the practical engineering application, and meanwhile, the replacement and filling method can also cause a large amount of abandoned soil to cause huge environmental damage. The water insulation method is to arrange a water insulation layer in the roadbed, wherein the water insulation layer is mainly made of various waterproof materials, such as: impermeable geomembranes, impermeable geotextiles, and the like. In the actual construction process, no matter the anti-seepage film or the anti-seepage geotextile, various damages are inevitable, so that the whole roadbed has the actual water-resisting effect, and the engineering application effect is poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a monument road bed rigidity reinforcing structure in season frozen zone, adopts geotechnological check room and thermal insulation layer combined action, can strengthen the rigidity of monument road bed, can prevent again because the reduction of monument road bed rigidity that freeze thawing cycle effect leads to in season frozen zone to reach the mesh that reduces clay road bed and warp, technical scheme is as follows:

the application provides a rigidity enhancing structure for a clay roadbed in a monsoon-frozen region, which comprises a clay roadbed matrix, a heat-insulation layer and a rigidity enhancing layer, wherein the heat-insulation layer is positioned on the surface of the clay roadbed matrix so as to prevent the clay roadbed from melting and sinking due to the freezing of water in the clay roadbed; the rigidity reinforcing layer is positioned on the surface of the heat-insulation layer, which is far away from the clay roadbed matrix, so that the rigidity of the clay roadbed is enhanced; wherein the stiffness enhancing layer comprises a geocell filled with clay to diffuse an additional load transmitted by the vehicle.

For example, in one embodiment, the stiffness-enhancing layer further comprises a geocell cushion layer and a geocell protective layer, the geocell cushion layer is located between the thermal insulation layer and the geocell, the geocell protective layer is located on the surface of the geocell facing away from the geocell cushion layer, and the surface of the geocell protective layer forms a clay roadbed top surface; and backfilling clay which exceeds the containing space of the geocell in the geocell, and compacting to form the geocell protective layer.

For example, in the soil-based rigidity reinforcing structure for the permafrost region, the thermal insulation layer is a foam lightweight soil layer, and the thickness of the thermal insulation layer in the direction perpendicular to the ground is 30cm.

For example, in the permafrost region clay roadbed rigidity reinforcing structure provided by one embodiment, the surface of the heat insulation layer, which faces away from the clay roadbed matrix, is filled with clay and is compacted to form the geocell cushion layer, and the thickness of the geocell cushion layer in the direction vertical to the ground is 10cm.

For example, in one embodiment, the permafrost region clay roadbed rigidity reinforcing structure is provided, wherein the height of the geocell is 10cm, and the side length of the unit cell of the geocell is 40cm.

For example, in one embodiment, the geocell protection layer has a thickness perpendicular to the ground of 10cm in a permafrost region clay roadbed stiffness enhancing structure.

For example, in the permafrost region clay road foundation rigidity reinforcing structure provided by one embodiment, the heat-insulating layer is arranged on the surface of the clay road foundation base body, which is 60cm away from the top surface of the clay road foundation in the direction vertical to the ground, in height.

The beneficial effect that a season freezes district clay road bed rigidity reinforcing structure that some embodiments provided of this application brought does: the geocell and the heat insulation layer are combined to act, so that the rigidity of the clay roadbed can be enhanced, the deformation of the roadbed caused by the additional load of vehicles can be reduced, the reduction of the rigidity of the clay roadbed caused by the freeze-thaw cycle action of a season freezing area can be prevented, and the purpose of reducing the deformation of the clay roadbed is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic cross-sectional view of a permafrost region clay roadbed rigidity reinforcing structure of the application.

Reference numerals: 1-clay roadbed base body, 11-clay roadbed top surface, 2-heat preservation and insulation layer, 3-rigidity reinforcing layer, 31-geocell, 32-geocell cushion layer and 33-geocell protective layer.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The application provides a rigidity enhancing structure for a clay roadbed in a monsoon freezing region, which comprises a clay roadbed base 1, a heat insulation layer 2 and a rigidity enhancing layer 3, wherein the heat insulation layer 2 is positioned on the surface of the clay roadbed base 1 so as to prevent the clay roadbed from melting and sinking due to the freezing of water in the clay roadbed; the rigidity reinforcing layer 3 is positioned on the surface of the heat-insulating layer 2, which is far away from the clay roadbed matrix 1, so as to reinforce the rigidity of the clay roadbed; wherein the stiffness enhancing layer 3 comprises geocells 31, and the geocells 31 are filled with clay to diffuse additional load transmitted by vehicles.

Wherein, the clay roadbed base body 1, the heat preservation and insulation layer 2 and the rigidity strengthening layer 3 jointly form a clay roadbed.

According to the embodiment, the geocell 31 is arranged above the clay roadbed matrix 1, so that the rigidity of the clay roadbed can be enhanced, the additional load transmitted by vehicles can be diffused, and the dynamic stress in the clay roadbed can be reduced, so that the aim of reducing the deformation of the clay roadbed is fulfilled; although geotechnological check room 31 can improve road bed rigidity, nevertheless can't prevent because freeze thawing cycle effect, lead to the decline of road bed rigidity, this application is through setting up heat preservation insulating layer 2 in geotechnological check room 31 below, can prevent that the water distribution in the clay road bed base member 1 below heat preservation insulating layer 2 from taking place to freeze to prevent the emergence of road bed frozen swelling phenomenon, the road bed is owing to not freezing, just can not produce the thaw collapse phenomenon yet. The geocell 31 and the heat-insulating layer 2 are combined to act, so that the rigidity of the clay roadbed can be enhanced, the reduction of the rigidity of the clay roadbed caused by the freezing and thawing circulation action of a seasonal freezing area can be prevented, and the purpose of reducing the deformation of the clay roadbed is achieved.

For example, in the permafrost region clay soil foundation stiffness enhancing structure provided in one embodiment, as shown in fig. 1, the stiffness enhancing layer 3 further includes a geocell pad layer 32 and a geocell protective layer 33, the geocell pad layer 32 is located between the thermal insulation layer 2 and the geocell 31, the geocell protective layer 33 is located on a surface of the geocell 31 facing away from the geocell pad layer 32, and a surface of the geocell protective layer 33 forms a clay road foundation top surface 11; wherein, the geocell 31 is backfilled with clay which exceeds the containing space of the geocell 31 and is compacted to form the geocell protective layer 33.

The earthwork standard room 31 is stretched and fixed when being laid, the stretched earthwork standard room 31 is backfilled by clay, the backfilling height of the clay is higher than the top surface of the earthwork standard room 31, the concrete exceeding value is calculated according to the loose coefficient of the clay used on site, and then the earthwork standard room is compacted by a road roller to form the earthwork standard room protective layer 33.

For example, in the soil-based rigidity reinforcing structure for the permafrost region provided by the embodiment, the thermal insulation layer 2 is a foamed lightweight soil layer, and the thickness of the thermal insulation layer 2 in the direction vertical to the ground is 30cm. The foam light soil layer is used as the heat insulation layer 2, and the rigidity of the clay subgrade can be further enhanced by utilizing the characteristic of higher strength of the foam light soil.

For example, in the permafrost region clay roadbed stiffness reinforcing structure provided by the embodiment, as shown in fig. 1, the surface of the thermal insulation layer 2, which faces away from the clay roadbed matrix 1, is filled with clay and compacted to form the geocell cushion layer 32, and the thickness of the geocell cushion layer 32 in the direction vertical to the ground is 10cm.

For example, in the permafrost region clay subgrade rigidity reinforcing structure provided by one embodiment, as shown in fig. 1, the height of the geocell 31 is 10cm, and the side length of the unit cell of the geocell 31 is 40cm.

The geocell 31 is a three-dimensional mesh cell structure formed by high-strength welding of reinforced materials, clay is filled in the geocell 31 to form a structure body with strong lateral limitation and high rigidity, the bearing capacity of the roadbed can be effectively enhanced, and the geocell 31 has a load dispersing effect.

For example, in one embodiment, a geyser area clay roadbed stiffness enhanced structure is provided, as shown in fig. 1, the geocell protection layer 33 has a thickness of 10cm in the direction perpendicular to the ground.

For example, in the rigidity-enhanced structure of the clay roadbed in the permafrost region provided by the embodiment, as shown in fig. 1, the thermal insulation layer 2 is arranged on the height surface of the clay roadbed matrix 1, which is about 60cm away from the top surface 11 of the clay roadbed in the direction vertical to the ground.

Specifically, a land is leveled by a land leveler on a surface of the clay roadbed matrix 1, which is at a height of about 60cm from the clay roadbed top surface 11 in the direction vertical to the ground, and then foam light soil is filled as the heat-insulating layer 2.

The construction steps of the permafrost region clay subgrade rigidity reinforcing structure are as follows: when the clay roadbed base body 1 is filled to be about 60cm away from the clay roadbed top surface 11, a land is finely leveled by a grader, and then foam light soil is filled to be used as a heat insulation layer 2, wherein the thickness of the foam light soil is 30cm; after the foam light soil is filled, filling the geocell cushion layer 32 by using clay as a filler, and then compacting by rolling by using a road roller, wherein the thickness of the compacted geocell cushion layer 32 is 10cm; after the geocell cushion layer 32 is constructed, the geocell 31 is laid above the geocell cushion layer, the height of the geocell 31 is 10cm, the side length of each unit cell is 40cm, and the geocell 31 is stretched and fixed when being laid; and backfilling the stretched geocell 31 with clay, wherein the backfilling height of the clay is about 15cm higher than the top surface of the geocell 31, the concrete numerical value is calculated according to the loose coefficient of the clay used on site, and then, rolling and compacting by using a road roller to form a geocell protective layer 33, wherein the thickness of the geocell protective layer 33 is 10cm.

The utility model provides a season freezes district clay road bed rigidity reinforcing structure, can strengthen the rigidity of clay road bed, reduce the deformation that the vehicle additional load arouses the road bed, can prevent again because the freezing and thawing cycle effect in season freezes the district, lead to the decline of clay road bed rigidity.

While embodiments of the present application have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to a variety of fields suitable for this application, and it will be readily apparent to those skilled in the art that additional modifications may be made, and the application is not limited to the details shown and described herein, without departing from the general concept as defined by the claims and their equivalents.

Claims

1. A frozen region clay road base rigidity reinforcing structure in season, its characterized in that includes:

a clay roadbed substrate;

the heat insulation layer is positioned on the surface of the clay roadbed matrix so as to prevent the clay roadbed from melting and sinking due to the freezing of water in the clay roadbed;

the rigidity reinforcing layer is positioned on the surface of the heat-insulation layer, which is away from the clay roadbed matrix, so that the rigidity of the clay roadbed is enhanced;

wherein the stiffness enhancing layer comprises a geocell filled with clay to diffuse an additional load transmitted by the vehicle.

2. The permafrost region clay road base stiffness-enhancing structure according to claim 1, wherein the stiffness-enhancing layer further comprises:

the geocell cushion layer is positioned between the heat insulation layer and the geocell;

the geocell protective layer is positioned on the surface of the geocell, which is far away from the geocell cushion layer, and the surface of the geocell protective layer forms a clay roadbed top surface;

and backfilling clay which exceeds the containing space of the geocell in the geocell, and compacting to form the geocell protective layer.

3. The structure for reinforcing the rigidity of the clay roadbed in the frozen region in the season zone as claimed in claim 1, wherein the heat insulation layer is a foamed light soil layer, and the thickness of the heat insulation layer in the direction perpendicular to the ground is 30cm.

4. The structure for enhancing the rigidity of the clay roadbed in the frozen region as claimed in claim 2, wherein the surface of the heat-insulating layer, which faces away from the clay roadbed matrix, is filled with clay and compacted to form the geocell cushion layer, and the thickness of the geocell cushion layer in the direction vertical to the ground is 10cm.

5. The road foundation rigidity reinforcing structure for clay in prefreeding areas according to claim 2, wherein the height of the geocell is 10cm, and the side length of the unit cell of the geocell is 40cm.

6. The structure for reinforcing the rigidity of the clay roadbed in the frozen region in the season zone as claimed in claim 2, wherein the thickness of the geocell protection layer in the direction perpendicular to the ground is 10cm.

7. The rigidity-enhancing structure for the clay roadbed in the frozen season area as claimed in claim 2, wherein the heat-insulating layer is arranged on the clay roadbed matrix in a height surface which is 60cm away from the top surface of the clay roadbed in the direction vertical to the ground.