Road embankment made on permafrost ground

FIELD: building, particularly to construct road embankments on permafrost ground.

SUBSTANCE: road embankment comprises embankment body composed of two stacked layers and ballast prism arranged on base platform. Each layer is formed as trapeze with larger base facing downwards. Lower base of upper layer trapeze has dimension c equal to that of upper base of lower layer trapeze. Lower base of upper layer trapeze mates upper base of lower layer trapeze. Upper layer has side slope less than that of lower layer. Main embankment parameters are determined from corresponding relations.

EFFECT: provision of embankment stability due to permafrost temperature reduction in embankment base.

2 cl, 1 dwg

 

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

Known transverse profiles of embankments constructed under normal conditions, outside the zone of distribution of permafrost (Frishman M.A., Khokhlov, I.N., Titov VP roadbed for Railways. - M.: Transport, 1972, p.16).

The lack of such profiles of barrows consists in the fact 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 an embankment of height more than 1.5 m, containing the body of the mound, made at the height of the two layers, and the prism ballast designed for construction on permafrost (Jenkin G.N., Grachev I.A. Features of railroad construction in areas of permafrost and wetlands. - M.: CMD Ministry of Railways of Russia, 2000, s, the figure"g".

The lack of embankments of this design is that at low water the mound happen subsidence, which leads to the destruction of the mound.

The invention solves the problem of the stability of the embankment in the most adverse conditions by lowering the temperature of permafrost at the base of the mound.

To achieve the specified-which results in road embankment in permafrost soils, containing the body of the mound, made according to the height of two tiers, each of which in cross section is a trapezoid, inverted bóa great base down, and the prism ballast, located on the main place, lower the trapezoid base of the upper tier of the size the same size and position with the upper base of the trapezoid of the lower tier, and the inclination of the side slopes of the upper tier is less than the slope of the side slopes of the lower tier, with the main parameters of the embankment is determined from the following relationships:

(1:4)<i1≤(1:1)

i2≤(1:4)

with=to·20, m,

hn=h-hb, m,

where i1the slope of the sides of the trapezoid of the lower tier, b/R:

i2- the same, the upper tier, b/p;

with the size of the lower bases of the trapezoid of the upper tier, m;

K=0,8-2,0 - correction factor, b/p;

hb- the height of the upper layer, m;

b - width of the main grounds of barrows, m;

hn- the height of the lower layer, m;

h - height of the embankment, m

In addition, the slope of the "i3" the side slopes of the ballast section may be equal to i3≤(1:4).

The proposed road embankment shown in the drawing. Road embankment in permafrost contains the body 1 of the embankment and ballast prism 2, located on main floor 3 of the mound. Barrow is located on the EU is the natural enemy of the surface 4 of the ground. The body 1 of the mound is the height of two tiers: the lower 5 and upper 6. Each tier represents a cross section of a trapezoid, inverted bóa great base down, with the bottom line of the upper tier of the same size and position with the upper base of the trapezoid of the lower tier. The side slopes of the upper tier have a smaller slope than the side slopes of the lower tier. The position of the upper permafrost boundary shown in position 7.

The main parameters of the embankment is determined from the following relationships:

(1:4)≤i1≤(1:1)

i2≤(1:4)

with=to·20, m,

hn=h-hb, m,

i3≤(1:4)

where i1the slope of the sides of the trapezoid of the lower tier, b/R:

i2- the same, the upper tier, b/p;

with the size of the lower bases of the trapezoid of the upper tier, m;

K=0,8-2,0 - correction factor, b/p;

hb- the height of the upper layer, m;

b - width of the main grounds of barrows, m;

hn- the height of the lower layer, m;

h - height of the embankment, m;

i3- slope side slopes of the ballast section, b/R.

The proposed road embankment in permafrost soils is designed for heavy sagapress and works as follows. In winter conditions of the Arctic tundra is a strong sagopilone, which is sinnah places the snow accumulates, and with elevated blown away. The proposed configuration of the embankment width allows blown platform mounds in the winter to provide a virtually bare of snow surface, which in turn ensures a good flow of cold in the ground. Since the average annual temperature in this region is negative, despite the heat flux through the upper surface of the mound during the summer period, the total for the year heat balance is negative. As a result, the space width "C" formed a favorable temperature regime, and at the end of the warm period of the year the upper boundary of permafrost (item 7) is included in the body of the mound. The main parameters of the embankment selected from the following considerations. Established by the results of long-term observations of soil temperature regime that the bare surface conditions of the Arctic forms in the soils of the permafrost grounds. That was not year-round thawed zones and seasonal summer thawing was limited to the active layer, it is necessary to provide some width of area "C". In accordance with the recommendations ZNIIS (SP-32-101-95 "Design and Foundation of bridge piers in the areas of distribution of permafrost". M Corporation "Transstroy", 1996, pp.37-41) width of zone "C" is

C=4h, m,

where h is the depth to which the charge of the W thermal influence zone "C".

Experience shows that if at a depth of 5 m below the centre of the mound will be provided permafrost, barrow will be sustainable. In this case, C=20 m When the low altitude of the mound (about 1.0 m) and undisturbed near embankment vegetation cover value "C" can be reduced to 16 m high embankment (10 m or more) permafrost should be provided at the level of the embankment foot. In this case, C=40 m

The result can be proposed formula

with=to·20 m,

where K is a correction factor equal to 0.8÷2,0 depending on the height of the embankment.

The magnitude of the slope of i2is determined from the conditions that the surface was not covered with snow. This is usually a slope of 1:5 (in accordance with field observations). However, to ensure the desired width of the "C" at low height embankment slopes i2can serve up to degeneracy in practically a horizontal surface with a slope that allow only the flow of surface waters. On the other hand, when the height of the embankment to reduce the height of the lower tier may be appropriate device slope of 1:4.

The height of the upper tier of hbis a derived value from the "from" and "i2" and is determined from the geometrical relations

where b is the width of the main grounds of barrows, m

As already noted, for embankments small height is the claim to provide the desired value of "C" may lead to the degeneration of the slope "i 2" in almost horizontal to the ground, and the height of the upper tier to the pursuit of zero. For embankments great height, on the contrary, the height of the upper tier of hbwill grow. This is all the more justified that at a higher average elevation of the surface slope of the upper tier of abdusemet and reducing the degree of snehapanam will improve.

The height of the lower tier "hn" is defined as the difference between the total height "hb" the mound and height "hb" top tier:

hn=h-hb.

The slope of the "i1for the lower tier should be as steep and determined by calculation on the overall stability of the embankment. This is because at the foot of the slope of the mound of snow accumulates almost regardless of the value of i1". At the same time, from the point of view of the nature of the heat transfer expedient as possible to reduce the horizontal projection of the lateral part of the lower tier, since the exposed surface of a fill slope is much stronger conducts the heat of the summer than the undisturbed part of the vegetation cover. In other words; the development in the width of the embankment within the lower tier, first, increases the amount of excavation work, and, secondly, worsens the conditions of heat exchange.

In other words, blown negotinska site should not be created in the middle by placing berms and not at the bottom, apologia QCD is si in the lower part of the mound, and Vice versa - the lower part of the embankment in the plan to reduce, increasing the slope of the slopes and at the top to create blown site.

It should be noted the role of ballast in negotovnosti. Because ballast prism consists of good material from the point of view of its stability, the slope of the ballast section is arranged steep. Further as precipitation embankment level control was performed using ballast, increasing the height of the ballast section with steep slopes up to 1:1 and steeper. As a result, in the top of the mound creates a "sail", which dramatically increases sniegsanas at the top of the embankment. Therefore the slope of the "i3" the slope of the ballast section to do 1:4 and the position.

The effectiveness of the proposed construction is in substantial lowering of the temperature of permafrost, which allows to ensure the stability of the embankment in the most adverse conditions, including swampy areas at low discharges.

1. Road embankment in permafrost soils, containing the body of the mound, made according to the height of two tiers, each of which in cross section is a trapezoid, facing a large base down, and ballast prism located at the main site, characterized in that the size of the lower bases of the trapezoid of the upper tier matches p is the magnitude and position with the upper base of the trapezoid of the lower tier, and the inclination of the side slopes of the upper tier is less than the slope of the side slopes of the lower tier, with the main parameters of the embankment is determined from the following relationships:

(1:4)<i1≤(1:1)

i2≤(1:4)

with=to·20, m,

hn=h-hb, m,

where i1the slope of the sides of the trapezoid of the lower tier, b/p;

i2- the same as the upper tier, b/p;

with the size of the lower bases of the trapezoid of the upper tier, m;

K=0,8-2,0 - correction factor, b/p;

hb- the height of the upper layer, m;

b - width of the main grounds of barrows, m;

hn- the height of the lower layer, m;

h - height of the embankment, m

2. Road embankment in permafrost according to claim 1, characterized in that the slope of the side slopes of the ballast section i3≤(1:4).



 

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