Road embankment built on permafrost ground

FIELD: building, particularly for constructing road embankments on permafrost ground bases.

SUBSTANCE: road embankment comprises embankment body laid on natural ground surface, ballast section formed on the main embankment area and heat insulation layer. Road embankment has side auxiliary ground bodies with heights of not less than 0.3 m and Bb widths located within the boundaries of the main embankment area, slopes thereof and on horizontal area of natural ground surface at embankment slope base from ballast section sides. Heat insulation layer with Rh thermal resistance is located on leveling layer of dry frozen sand immediately under side auxiliary ground body. Bb is determined from specified condition.

EFFECT: increased stability and durability of embankment built on permafrost ground under heavy drift-snow transport conditions, simplified perennial technology of building thereof and extended range or local permafrost ground application.

3 cl, 5 dwg

 

The invention relates to the field of construction, namely for the construction of road embankments in permafrost soils at their bases.

Known species cross profile of embankments constructed under normal conditions, outside the zone of distribution of permafrost (M.A. Frishman, I.N. Khokhlov, VP Titov. Roadbed for Railways. Publishing house “Transport”, 1972, S. 15, Fig. 1).

The disadvantages of such profiles embankments are that in case of their application in the field of permafrost on the subsidence during thawing of frozen soils subgrade deformation, which entails the destruction of the mound.

Closest to the present invention is a mound with the replacement of the soil at the base intended for use in areas of permafrost (GN. Jenkin, I.A. Grachev. “Peculiarities of railway construction in areas of permafrost and wetlands), CMD of the Ministry of Railways of Russia, 2000, S. 31, Fig. 1.6).

The disadvantage of this design is that for a device replacement is required often scarce draining soil. In addition, the cutting of frozen soil in the subgrade during the winter work is time-consuming, and in the summer leads to thawing of a large array of permafrost in the ground, downward their strength characteristics.

By the invention the solution is carried out the task of ensuring the stability and durability of the embankments in the area of distribution of permafrost in strong sagopilone with a substantial simplification of the year-round technology of their construction and expansion of area the application of the local frozen ground.

To achieve the technical result of road embankment in permafrost containing the body of the mound, laid on natural ground surface, the prism ballast, located on the main floor of the trench and the insulating layer, includes side auxiliary arrays of ground height of not less than 0.3 m, widthbadjacent on both sides to ballast prism and located within the main area of the mound, its slopes and in horizontal section on the natural surface of the ground at the foot of the embankment slopes, and the insulating layer with a thermal resistance Rtlocated on the leveling layer of somersalo sand directly beneath the ballast prism and side auxiliary arrays, with Rtdetermine thermophysical calculation of the terms of the inadmissibility of seasonal thawing of the soil under the ballast prism, and the width in the lateral auxiliary arrays define terms and conditions:

whereb- width of the lateral auxiliary array of soil, m;

incalc- width of the lateral auxiliary array of ground-defined thermal calculation of the conditions for the desired temperature of the earth beneath the body of the ballast section, m;

hnthe height of the discharge, m;

inp- the distance between the edges of the slope of the ballast section and the edge of the main platform mounds, m;

inOTC- the length of a fill slope, m;

ing- the length of the horizontal section of the auxiliary array of ground at the foot of the slope of the embankment, m

In addition, the lateral auxiliary arrays can be made of nijenrode tverdomedove soil with drainage slots to drain rainwater. And insulating layer width is made with a gap width of 0.3 - 3.0 m outside area not less than 4 m from the axis of the embankment and at least half the width of the embankment foot.

The proposed road embankment is illustrated in the drawings, where Fig. 1 shows an embankment with a height approaching zero, in the presence of solid insulation, cross-section;

in Fig. 2 is a view in plan;

in Fig. 3 depicts an embankment with a height approaching zero, in the presence of a thermal insulation gap;

in Fig. 4 is a view in plan;

in Fig. 5 shows a cross-section of the embankment low height.

Road embankment in permafrost soils of the proposed design contains the body 1 of the mound, filled with natural surface 2 of the base, ballast prism 3, is placed within the primary site 4 piles, lateral auxiliary arrays 5 adjacent sides to the ballast prism 3, RA is displaced within the primary site 4 barrows, its slopes 6 and natural surface 2 at the foot of the slopes of 6, and thermal insulation 7, is placed directly under the ballast layer 3 and the lateral auxiliary arrays 5. The insulation 7 is made, for example, from PENOPLEX. thermal resistance of the insulation Rtand , consequently, the thickness of PENOPLEX determined thermophysical calculation. Layer PENOPLEX placed on the leveling layer 8 made of sand. When the body height of the embankment hnmore than 0.5 m, to ensure drainage of rain water between the insulation 7 and ballast prism 3 is placed a layer of geotextile 9. The filter layer 9 of the geotextile is laid with a slope of 0.02% in both directions from the axis of the embankment with the release of the surface slope of about 0.2 m (Fig. 5). If the body height of the embankment hntends to zero, in the case of applications for lateral auxiliary arrays 5 local negreiros ground in the body of these arrays satisfied with the draining of the slot 10 of a width ofCRat a distance of inothersfrom each other. The experience of such drainage devices of the values inCRand inothersmust be respectively 0.5 m and 5 -15 m thus draining the slit and prism ballast must contain the ferrule 11 of geotextile.

The main purpose of the lateral auxiliary arrays soil - protection insulating layer from damage. Also what about the, auxiliary coating allows to reduce the required thickness of insulation. Auxiliary array 5 may be backfilled thawed, whomersley draining or tegmentum negreiros soil.

The width of the lateral auxiliary arrays inbmust be at least 2.0 m from the terms of preventing a sharp lowering of the freezing level on the sides of the ballast section at the end of the warm period of the year. As a result the value ofbis determined from the conditions:

wherecalc- width of the lateral auxiliary array of ground-defined thermal calculation of the conditions for the desired temperature of the earth beneath the body of the ballast section, m;

hn- the height of the embankment, m;

inp- the distance between the edges of the slope of the ballast section and the edge of the main platform mounds, m;

inOTC- the length of a fill slope, m;

ing- the length of the horizontal section of the auxiliary array of ground at the foot of the slope of the embankment, m

The height hblateral auxiliary array 5 should be at least 0.3 m from the conditions of application of soil compaction.

To ensure lower temperatures under the outer sides of the lateral auxiliary arrays 5 in the insulation 7 may be arranged in the gaps 12, the width of which inpcan oscillate about the 0.3-3.0 m Under the terms of the sustainability path distance from the axis of the embankment to the edge of the gap should not be less than half the width of the embankment foot or less than 4.0 m the position of the zero isotherm (the upper boundary of permafrost) at the end of the warm period in natural conditions after construction of the embankment in the solid insulation and after construction of the embankment in the presence of gaps in the insulation shown, respectively, in positions 13, 14, 15. In the solid insulation of the zero isotherm 14 under the side edge of the auxiliary array 5 goes down (Fig. 1), which can lead to undesirable precipitation of the array 5. In the event of a break in the insulation (Fig. 3) the zero isotherm 15 under the edge of the array 5 rises significantly, however, the gap is seasonal thawing. To avoid longitudinal filtration of rain water under the gap, the length of the gaps 12 are arranged jumpers 16, during which the insulation is made continuous. The length of the jumper ln=2-3 m

Mound building in the winter. The body 1 of the mound occiput of tverdomedove local ground, next to the leveling layer 8 consisting of somersalo soil stack insulation 7. From somersalo soil occiput ballast prism 3. Lateral auxiliary arrays can be made of tverdomedove local ground.

In heat against the AI barrow works as follows. In winter conditions of the Arctic, where there is a strong sagopilone, with the upper surface of the rail ballast and side auxiliary arrays snow blown that promotes the flow of cold in the Foundation soils. Although in the summer the surface is also exposed, which contributes to respectively enter the soil heat, total for the year heat balance provides for the formation of negative temperatures in soils grounds. Temperature base soil depends on the mean annual air temperature, heat insulation capacity, width of the lateral auxiliary arrays, the degree of climate warming and other, so it is determined by thermal calculation.

During the development of this invention was solved two technical contradictions.

The first contradiction. As a basic requirement of the developed technical solutions was inadmissibility sediment mounds in the presence of loose soils reason, the natural solution was the application of insulation under the ballast prism. The insulation reduces the depth of seasonal thawing until its complete elimination directly under the foam. However, if you use foam in case of climate warming is thawing soils foundations, and in the case of foam under the ball of astoi prism increased lateral heat flow at depth in the direction of the axis of the mound, that, in turn, contributes to the thawing of soils. Improvement of the temperature regime can be achieved by broadening the zone of thermal insulation. However, in this case it must be embedded in the ground to have a protective layer. When the depth of insulation on the surface there is deposited a layer of snow that will worsen temperature. Thus, on the one hand, there should be a broadening and deepening of the insulation, on the other, the recess is not necessary.

The contradiction is resolved by the introduction of lateral auxiliary array.

The second contradiction. When applying insulation under side of the auxiliary array on the outer edge of the zero isotherm at the end of the warm period abruptly goes down, which can lead to undesirable deformations. Further broadening of the lateral auxiliary array does not lead to results. The output from the contradiction was found device “gap” in the insulation, through which pokachivaetsya cold through the bare winter surface side of the auxiliary array.

The effectiveness of the proposed design is achieved under the following conditions:

- strong sagopilone;

- the temperature of the soil Foundation to building the embankment of the order of minus 2°and above;

- zero or small height of the embankment (not exceeding the depth of seasonal thawing);

- verojatno the ü global warming;

- the requirement of adnotatione construction (i.e. subsequent deformation of samoloty and Troubleshooting invalid);

- minimal use of imported materials.

1. Road embankment in permafrost containing the body of the mound, laid on natural ground surface, the prism ballast, located on the main floor of the mound, and the insulating layer, characterized in that it contains a side of the auxiliary arrays of ground height of not less than 0.3 m, widthblocated within the main area of the mound, its slopes and in horizontal section on the natural surface of the ground at the foot of the embankment slopes and adjacent to both sides of the ballast prism, and the insulating layer with a thermal resistance Rtlocated on the leveling layer of somersalo sand directly beneath the ballast prism and side auxiliary arrays, widthbdetermine from the condition

inbn+ OTC+ g,

whereb- width of the lateral auxiliary array of soil, m;

inn- the distance between the crest of the slope of the ballast section and the edge of the main platform mounds, m;

inOTC- the length of a fill slope, m;

ing- the length of the horizontal section of the auxiliary array Grunau soles slope of the mound, m

2. Road embankment according to claim 1, wherein the lateral auxiliary arrays made of nijenrode tverdomedove soil with drainage slots to drain rain water.

3. Road embankment according to claim 1, characterized in that the width of the insulating layer is made with a gap width of 0.3-3.0 m outside area not less than 4 m from the axis of the embankment and at least half the width of the embankment foot.



 

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