Road embankment berm

FIELD: building, particularly for erecting ground road embankment in permafrost territory.

SUBSTANCE: berm located on transversal ground grade and directly adjoining upper embankment slope is formed of fractional rock ground. Berm comprises side antifiltering lock located in embankment body on natural ground surface near berm, lower antifiltering lock arranged below natural ground surface at contact area with lower berm surface and side antifiltering lock. Upper berm surface is located above maximum level hn of surface longitudinal water flow in bottom area of upper embankment slope. Berm body may be partly deepened in natural ground surface.

EFFECT: prevention of embankment ground erosion, filtering through embankment body in transversal direction and thaw of embankment foundation.

2 cl, 2 dwg

 

The invention relates to the field of construction and can be used for construction of roadbed and road embankments in areas of permafrost.

Known berm, consisting of normal soil suitable for its construction, designed with a cross slope side of the field (Mauresmo and other “roadbed Railways), Transport, 1972, p.16).

Use it on the permafrost in the South-Eastern part of the permafrost zone of Russia will increase the risk of permafrost degradation in soils grounds.

Closest to the proposed berm is composed of rocky material immediately adjacent to crown the slope of the mound, located on the transverse slope (Gnisci, Iagree “Features of railway construction in areas of permafrost and wetlands), CMD of the Ministry of Railways of Russia, 2000, pp.86-87).

This berm prevents filtration of surface water through the body of the mound, which causes thawing of permafrost.

The invention aims to prevent erosion of the embankment, cross filter through the body of the mound and thawing of the soil base of the mound (the preservation of the natural positions of the upper permafrost boundary).

To achieve the technical result berm of a road embankment, located the and transverse slope, and directly adjacent to the raised slope of the mound, and made of rock fractional soil contains located in the body of the mound on the natural ground surface near the berm is made of nijenrode of impervious material with the side lock and the lower cutoff castle, made from nijenrode material and located below the natural ground surface in contact with the lower surface of the berm and the lateral membrane of the castle, with the upper surface of the berm exceeds the maximum level “hn” longitudinal surface water flow in the place of the soles of the upstream slope of the embankment, and the size of the berm determine terms and conditions

inb=m1inn,

Fb>Fn,

hb>hn,

wherebinn- the width respectively of the berm and the upper surface of the water flow, m;

FbFn- the cross-sectional area, respectively, berms and water flow, m2;

hbhn- height respectively of the berm and the water flow in the place of the soles of the upstream slope of the embankment, m;

m1=0,3-1 - coefficient taking into account local conditions, (b/R).

In addition, the berm may be partially recessed below the natural ground surface at small transverse slope.

The essence of the image is the shadow illustrated by drawings, where

figure 1 shows a cross-section of the embankment with the berm of the proposed design;

figure 2 shows a variant of the berm of the proposed design with a partial depth of the body of the berm in the Foundation soil.

Mound on subsidence of permafrost contains the body of the mound 1 from ordinary soil, suitable for buildings, pour on the ground of the base 2 with the natural surface 3, technological filling 4 of macro-grained rock ground side of the grout castle 5 out of nijenrode material, such as clay, the lower cutoff lock 6 from nijenrode material, for example clay, berm 7 of the rocky fraction of the soil. The side and bottom of the grout locks can be manufactured from waterproofing, ceramic and other materials. Items 5, 6, 7 are arranged with the horse side of the mound in the presence of cross slope. Arrow 8 indicates the direction of flow of surface waters, which form the mirror open water with the upper level 9 and width in then. Position 10 shows the position of the upper boundary of permafrost at the end of the warm period of the year.

At low transverse slope “α ” location and width of the water flow can be quite large and affect the temperature regime of the Foundation soil or will need the STI additional costs on the berm. In this regard, for small values of “α ” the body of berm 7 partially buried below the natural ground surface to the base of the mound. In this pit are also filtered water (figure 2).

Mound with berm proposed construction works as follows. In the heat of the mound 1 on permafrost ground bases in the steady state at the end of the warm period is formed of the zero isotherm 10. At the foot of the embankment slopes in most cases, there is some lowering of the zero isotherm, i.e. the increase in the depth of seasonal thawing. In the centre of the mound zero isotherm increases and can enter the body of the embankment.

With the horse in the direction of 8 surface water reach the body of the mound and accumulate, forming a water flow having a top surface 9 of a width ofnand directed along the embankment foot in the direction of the longitudinal lower surface. If the water forming at the foot of the upstream slope of the embankment backwater “hn”that will be filtered through the body of the mound 1 along her soles, produced by natural surface 3 of the soil, this may cause a sudden thawing of the Foundation soil, lowering the freezing level 10 and the subsequent development of deformations of the embankment. The danger of a transversal filter is increased by the presence of technological dumping 4 scrapealong soil, arrange in most cases, when the device of embankments on selenoproteome soils for traffic tsypysheva the body of the mound. To prevent transversal filter, arrange side cutoff lock 5 and the lower cutoff lock 6 from nijenrode soil, for example clay. These locks prevent the infiltration of water through the body of the mound, and under its sole and direct water flow along the embankment in the direction of the lower longitudinal profile. The berm from the rocky soil in the summer, plays the role of protecting the embankment from erosion.

In the presence of surface water is the heat transfer coefficient on the surface changes dramatically: the grass cover is not thermal resistance and the heat transfer coefficient from soil to air (about 20 kcal/(m2·h· hail) is changed on the heat transfer coefficient from soil to water (about 400 kcal/(m2·h· deg)). thermal resistance from the value of orderapproaches zero, which dramatically increases the inflow of heat into the soil. In winter, the body of berm 7 works as a stone dumping, where the main issue is not conductive, and convective heat transfer, so there is additional cooling of the soil. In the heat balance for the year is in the area of the water flow does not change compared to the case with no ditches or changes in the direction of negative values.

To the heat balance in the area of the water flow was required values required comparability of the width of the berm inb” and the water flow inn”. In the best case, inbmust be equal ton. However, when the berm, filled from the large stone, as experience shows, inbmay be of the order of 0,3Vni.e. we can formulate the condition

inb=m1inn,

where m1=0,3-1,0 - coefficient taking into account local conditions, (b/R).

Experience shows that the cooling effect of the berm increases with its height. Therefore, when the width reduction is expected to increase height that allows us to formulate the second condition

Fb>Fn,

where Fband Fn- the cross-sectional area, respectively, berms and water flow, m2.

In case of freezing water of the stone filling above the water level must continue to work, so the third condition can be formulated as follows:

hb>hn,

where hband hnheight in place of the soles of a fill slope, respectively, berms and water flow meters

1. The berm of a road embankment, located on the transverse slope adjacent to the raised slope of the mound and made of fractional rocky soil, characterized in that it contains the implementation of the military from nijenrode of impervious material with the side lock, located in the body of the mound on the natural ground surface near the berm, and the lower cutoff castle, situated below the natural ground surface in contact with the lower surface of the berm, and the lateral membrane of the castle, with the upper surface of the berm exceeds the maximum level hnsurface of the longitudinal water flow in the place of the soles of the upstream slope of the embankment, and the size of the berm determine terms and conditions:

Fb>Fn,

hb>hn,

where,- the width respectively of the berm and the upper surface of the water flow, m;

FbFn- the cross-sectional area, respectively, berms and water flow, m2;

hbhn- height respectively of the berm and the water flow in the place of the soles of the upstream slope of the embankment, m;

=0,3÷1 - coefficient taking into account local conditions (b/R).

2. The berm of a road embankment on p. 1, characterized in that the berm partially buried below the natural ground surface.



 

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