Road embankment built on permafrost ground

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

SUBSTANCE: road embankment comprises embankment body, ballast section formed on the main embankment area and heat insulation layer. Road embankment has side auxiliary ground bodies having hb heights and Bb widths located from ballast section sides within the boundaries of the main embankment area on natural ground surface at embankment slope base. Embankment body includes three layers, namely lower layer having hl height, medium layer having hm height and upper one having hu height. Upper layer is made of drainage soil. Heat insulation layer having Rh thermal resistance is located on leveling layer of dry frozen sand immediately under side auxiliary ground body. Heat insulation layer extends from its bottom to medium layer top surface and then over the top surface to vertical plane passing through the edge of main embankment area. Auxiliary ground body hb height is defined to increase convenience of mechanized embankment forming and is equal to 0.3 - 0.7 m in separate areas thereof. Main embankment dimensions are determined from predetermined conditions.

EFFECT: increased embankment stability and durability.

2 cl, 1 dwg

 

The invention relates to the field of construction, namely for the construction of road embankments in permafrost grounds.

Known transverse profiles of embankments constructed under normal conditions, outside the zone of distribution of permafrost (Mauresmo, Ingelow, Vphoto. Roadbed for Railways. Publishing house “Transport”, 1972, p.15, Fig. 1).

The lack of such profiles embankments in the case of their application in the field of permafrost is that frozen soil is the base of the mound exposed in the warm season defrosting, which entails a deformation of the road construction.

Closest to the present invention is a mound with the use of special measures to stabilize soils in her body with foam insulation and thermal diodes intended for use during construction on permafrost (Gnisci, Iagree “Features of railway construction in areas of permafrost and wetlands), CMD of the Ministry of Railways of Russia, 2000, p.31, Fig. 1.6).

The disadvantage of this design is that it requires the body of the mound imported draining soil and do not guarantee against the occurrence of deformation of the subgrade due to thawing or thaw frozen grounds, especially in the construction of roads in t is ply period of the year.

The invention solves the problem of the stability and durability of embankments, constructed from local frozen ndonesian soil, constructed during the cold period of the year.

To achieve the technical result in road embankment in permafrost soils, containing the body of the mound, the prism ballast, located on the main floor of the trench and the insulating layer, arranged side auxiliary arrays of ground height hband width in theblocated on the sides of the ballast section within the main area of the mound, its slopes and in horizontal section on the natural ground surface adjacent to the bottom of the embankment slopes, and the body of the mound is made of three tiers: the lower the height hNZ, average height hcpmade of draining soil of the upper tier of height hNRwhen this insulating layer thermal resistance RTlocated on the leveling layer of somersalo sand directly under side of the auxiliary array, from the bottom to the top level of the middle tier of the body of the mound, then along the upper surface of the middle tier of the body of the mound to the vertical plane passing through the edge of the main area of the mound, and the height hblateral auxiliary array is determined by the convenience of mechanized from the IPCI it and may be different in some areas, the main dimensions of the mound determine terms and conditions

incalcinb=p+OTC+g, m,

hNZhb, m,

hNRht-hBP, m,

hcf=hn-hNZ-hNR, m,

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;

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

inp- the distance between the edges of the ballast section and the main area of the mound, m;

inOTC- the length of a fill slope, m;

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

hNZ- the height of the lower tier of the body of the barrow, m;

hb- the height of the lateral auxiliary array of soil, m;

hNR- the height of the upper tier of the body of the barrow, m;

htthe maximum possible depth of seasonal thawing of the soil, m;

hBP- the height of the ballast section, m;

hcp- the height of the middle tier of the body of the barrow, m;

hn- body height of the embankment (without ballast), m

The essence of the invention is illustrated in the drawing, which shows a cross-section of the embankment.

Road embankment in permafrost gr is ntah the proposed design contains the body 1 of the mound, laid on a natural surface 2 of the ground, ballast prism 3, located on the main floor of 4 piles, lateral auxiliary arrays 5, located on the sides of the ballast section within the main site 4, its slopes 6 and in horizontal section on the natural surface of the ground at the foot of the embankment slopes. The slope of the embankment slopes provide a 1:3 or flatter. This is due to the nature of snehapanam in conditions of strong sagapress: the flatter the slope, the less negotovnosti. The thickness of the hblateral auxiliary arrays is determined by the convenience of mechanized their packing, may be variable in width inband is 0,3-0,7 m When the slope is, for example, 1:4, width horizontal sectional side auxiliary array is respectively 1.2 to 2.8 m, which allows the use of the sealing means. The body of the mound contains three tiers: the lower the height hNZthe average height of hcpand the top height of hNR. The height hNRthe upper tier is determined by the depth of seasonal thawing: hNRht- hBPwhere htthe maximum possible depth of seasonal thawing, m; hBP- the height of the ballast, M. This tier it falls from somersalo sand. The bottom and middle tiers slept during the local termometro what about the soil and avoid drawdowns should not protiviti during all time of operation. The total height of the lower and middle tiers is determined by the difference between the total height of the embankment and the height of the upper tier and aims at reducing the total height of the embankment to the height of the lower tier, if the horizontal part at the foot of the embankment side of the auxiliary array is made of nijenrode material, and to zero if from draining. In the latter case, the height of the embankment is equal to the height of the upper layer, and the insulating layer is positioned horizontally.

Road embankment in permafrost soils contain insulating layer 7, for example “PENOPLEX”, thermal resistance Rtlocated on the leveling layer 8 of somersalo sand directly beneath the lateral auxiliary array from the bottom to the top level of the middle tier of the body of the mound, then along the upper surface of the middle tier of the body of the mound to the vertical plane passing through the edge of the main area of the mound. The total length of incalcand the power of Rtthe insulating layer are determined by thermal calculation and is considered from the point And spaced from the axis of the embankment by half the width of the main site of the mound, i.e. inop/2. Insulating layer together with lateral auxiliary array continues beyond the foot of the embankment slopes on the width of at least two of the depth of seasonal thawing of the soil.

Positions 9 and 10 show the position of the upper boundary of permafrost at the end of the warm period of the year, respectively, before and after the construction of the embankment. To drain precipitation from the ballast section and the upper tier of the body of the mound at the base of the upper tier is laid filter layer 11 geotextile with a slope in the direction of a slope of 0.01-0.02 and produced beyond the lateral auxiliary array 20-30 cm thick Layer of geotextile may be placed under the ballast prism and the surface of the slope 6 within the upper tier embankment height hNR. The upper part of the lateral auxiliary array located above the upper surface of the middle tier, constructed either from draining soil, such as sand, or of any soil, but with slots from draining soil for drainage of rain water from the upper tier of the mound. Part of the lateral auxiliary array located below the upper surface of the middle tier, it falls from any soil. Border-horizontal insulation 7 and the leveling layer 8 shown in item 12.

The construction of a road embankment in permafrost soils is carried out in the winter. First occiput the lower and middle tiers of the body 1 of the mound tegmentum local soil. When you use icy ground, because it is supposed to be between the employer during the entire life in the frozen state. After compaction slept leveling layer 8 and fits insulating layer 7. Next occiput side auxiliary arrays 5 by successive stacking of horizontal layers and mechanized their seals. After filling the lower and middle tiers of the body of the embankment together with the insulation and the bottom side of the auxiliary arrays occiput in the same sequence, first the upper tier of the body of the mound, and then the prism ballast together with the remaining part of the lateral auxiliary array.

Road embankment in permafrost soils is as follows. In winter the upper part of the bare mound of snow, so there is an intensive flow of cold in the ground, especially in the area of OA. And although in the summer there is also an intensive transfer of heat, due to a negative average annual air temperature is the overall balance is negative. In the area of the slopes and at the foot of the mound in the winter because of the snow, so the total heat balance can be close to zero or even positive, so here appropriate stacking of the insulating layer. Lateral auxiliary array serves to protect the insulation from damage. In its upper part it also serves to eliminate the “sail” of the ballast section. The cold coming through the area OA is the body of the mound, extends across the entire width of the embankment and output it in summer, the air is hindered due to the presence of insulation in the greater part of the width of the embankment. In the body and the base of the mound formed stable negative ground temperature.

Main technical contradiction was as follows. To save the body of the barrow permafrost as you can to a greater extent expedient device to the main ground insulation, as is done in the prototype. However, in this case, slowing down the inflow of cold through the main area, bare in winter from snow. Thus, on the one hand, thermal insulation is needed, the other does not. The output from the contradiction was found in the following way: the width of the main ground insulation was removed, which provided the “sign in” cold, “quit” cold has been hampered by the device on the side of the embankment insulation. At the same time, so that increasing in the summer as a result of liquidation of the insulation of the height of the active layer does not lead to subsidence, formed at the height of the active layer, the upper tier of the body of the mound, filled from neprosadochnyh thawing of the soil.

The area of effective use of the proposed technical solutions:

- regions with strong snehapanam;

the embankment height greater than a height of the active layer to the exposed surface the displacement.

The proposed design allows you to use local frozen ndonesian soils, subsidence during thawing.

1. Road embankment in permafrost soils, containing the body of the mound, 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 hband width in theblocated on the sides of the ballast section 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, while the body of the mound is made of three tiers: the lower the height hNZ, average height hcpand the top height of hNRand the top tier is made of draining soil and a layer of insulation thermal resistance Rtlocated on the leveling layer of somersalo sand directly under side of the auxiliary array, from the bottom to the top level of the middle tier of the body of the mound, then along the upper surface of the middle tier of the body of the mound to the vertical plane passing through the edge of the main area of the mound, the height hblateral auxiliary array is determined by the convenience of mechanized dumping it and has a value of 0.3 to 0.7 m in some areas, and RA is the measure of the mound are determined from conditions

inb=p+OTC+gm

hNZhbm

hNRht-hBPm

hcf=hn-hNZ-hNRm

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

inp- the distance between the edges of the ballast section and the main area of the mound, m;

inOTC- the length of a fill slope, m;

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

hNZ- the height of the lower tier of the body of the barrow, m;

hb- the height of the lateral auxiliary array of soil, m;

hNR- the height of the upper tier of the body of the barrow, m;

htthe maximum possible depth of seasonal thawing of the soil, m;

hBP- the height of the ballast section, m;

hcp- the height of the middle tier of the body of the barrow, m;

hn- body height of the embankment (without ballast), m

2. Road embankment in permafrost according to claim 1, characterized in that at the base of the upper tier of the body of the mound with filter layer of geotextile with a slope of 0.01-0.02 in the direction of the slope of the mound, with a layer of geotextile released outside of the lateral auxiliary array 20-30 cm, and a layer of geotextile may be placed under the ballast is Rizvi and surface slope within the upper tier embankment height h NR.



 

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

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