Groove for road building

FIELD: building, particularly for building railroad embankments in permafrost zones.

SUBSTANCE: groove includes ballast prism, support massif contacting with groove slopes by side massif walls and arranged under ballast prism, heat insulation layer laid on groove slopes and protective layer located above heat insulation one. Support body comprises upper part of hU height formed of fractional rock and lower part of hL height made of non-drainage ground. Protective layer is made of drainage ground. Support massif height h0, upper part height hU and lower part hL height are determined from corresponding relations.

EFFECT: prevention of road bed deformation during embankment erection.

1 dwg

 

The invention relates to the field of construction, namely the construction of railway embankments in areas of permafrost.

Known road excavation on permafrost (Mauresmo, Ingelow, Vphoto. Roadbed for Railways. The transport. M, 1972, Fig. 16). The disadvantage of this seizure is that vysokoplastichnyh thawing soils II-IV categories as a result of thawing soils grounds of possible deformation.

Closest to the proposed road is a notch on vysokoplastichnyh soils II-IV categories containing ballast prism and supporting an array of replaced soil and rock placement within the slopes and the main site. In addition, on the slopes and within the reference array of stacked insulating layer (Gnisci, Iagree. Features of railroad construction in areas of permafrost and wetlands. M, 2000, Fig. 1.39).

The disadvantage of this seizure is that in the presence of transverse and longitudinal filtering possible infiltration seepage under a layer of insulation that will lead to irreversible processes soil thawing the Foundation, despite the presence of riprap, the influence of which is sharply reduced due to the presence of a layer of insulation.

The invention solves the problem of the elimination of the de is armacy subgrade during construction of embankments in viscolastic permafrost, subsidence during thawing.

To achieve the technical result in road excavation on permafrost soils containing ballast prism, located underneath the reference array in contact with the recess slopes lateral sides and the insulating layer laid on the recess slopes, located on top of the protective layer, the reference array contains made of fractional rocky soil the top layer of height hinand lower tier height hnmade of nijenrode ground, and a protective layer of draining soil, the height of the reference array haboutthe height hinthe upper and hnthe lower tiers and the width innthe reference array is defined accordingly dependencies:

habout=hin+hn, m,

hin2.5 m,

hn0.5 m,

inn=p+m2ho, m,

where habout- height of the reference array, m;

inn- width of the reference array to a bottom, m;

inn- width of the foot support prism, m;

inin- width of the reference array on top, m;

m=0,8-1,2 - coefficient taking into account local conditions, b/R.

The invention is illustrated in the drawing, which presents a cross section of road excavation of the proposed design.

Road excavation on permafrost soils contain ballast p is ISM 1, the reference array 2 with a total height of hounderneath the ballast prism and its lateral sides in contact with the excavation slopes 3 and insulating layer 4 on the slopes of the 3 notches with located on top of the protective layer 5. Insulating layer 4 can also be extended at a slope excavation in the area of the reference array 2. The reference array 2 contains tiers: the top 6 height hinand the bottom 7 of height hn. The upper layer 6 made of fractional rocky soil, preferably from a stone the size of 20-30 cm, and the lower tier 7 is made of nijenrode soil. The required minimum width of the reference array innis determined from the distribution at an angle of 45 load from the ballast section:

inn=p+m2habout, m,

m=0,8-1,2 - coefficient taking into account local conditions, b/R.

The protective layer 5 made of draining soil. On top of the insulation 4 and protective layer 5 are horizontal transition section. For the Department draining soil protective layer 5 from dust primary ground 8, and also for the Department of soil ballast 1 from fractional rocky ground reference array 2 is made of a layer of geotextile, respectively 9 and 10. The position of the upper boundary of permafrost at the end of the warm period of the year shown in item 11.

In thermal relation to road excavation ve on womersly soils of the proposed construction works as follows.

First of all, note that the main advantage of this design is that it allows viscolastic soils to collect lateral inflow of surface water and to carry out longitudinal filtering these waters without thawing base soil. This is achieved as follows.

The water supplied from the side of the protective layer 5, or directly in the reference array 2 from above, accumulates on the upper surface of the lower tier 7 and begins to move it in the longitudinal direction. Temperature filtered water, thus determines the temperature of the upper surface of layer 7 (it is almost equal to it). The temperature of the filtered water is much lower temperatures, because before we get to the specified position, it passes through the upper layers of the soil, colder than the air, and takes the temperature of the soil. However, this positive temperature that causes thawing of the soil in the lower tier 7. To prevent ground subsidence, the position of the upper permafrost boundary 11 at the end of the warm period of the year should not go beyond the lower tier. Almost the depth of thawing, counting from the top surface of the lower layer 7, will not exceed 1 m It can be installed thermophysical calculation. However, less than 0.5 m the value of hthe not to be prescribed. If native soils are in the lower tier 7 in the range of depth 0.5-1.0 m of neprosadochnyh, replace the soil and can not do. In the winter due to the work of riprap upper tier 6 in soils arrives cold, compensating heat supplied during the summer. As a result the temperature of underlying soils or maintained or even reduced. Insulation 4 protects during the summer recess slopes from thawing. In the winter cold to the insulation comes not only from above, through the protective layer 5, but also from below, the cooling effect of the riprap in the upper tier 6. The protective layer 5 not only protects the insulation from damage, but also ensures the flow of surface and ground water in the vicinity of the notch. (For collecting and draining water from more extensive adjacent to the excavation site suitable device upland ditches).

During the development of this technical solution, it was decided the following technical contradiction. In the prototype provided by the installation of insulation under the entire recess. Such insulation can significantly reduce heat flow in soils in summer. And this solution can work well on viscolastic soils in the absence of filtering. However, if the filter requires a stronger compensation hall of the house during the winter. However, the insulation prevents this. Thus, on the one hand, thermal insulation is needed, the other is not needed. The solution of the technical contradiction is achieved by breaking the insulation width: on the slopes, it remains, and under the ballast prism is excluded. This increases the cooling effect by increasing the thickness of the riprap and through the creation of the lower layer 7 of the reference array. The required thickness (height) of the lower tier already stated above, and the required height of the upper tier 6 should be not less than 2.5 m (from the experience of operating on Railways such dumps in similar conditions).

The area of effective application of this construction - extraction and zero when there viscolastic soil subsidence during thawing. The use of technical solutions implies the existence of unilateral longitudinal slope in the level of the upper surface of the lower layer 7, so that by the beginning of the cold period of the year, water from the outside of the upper tier 6 was fully gone.

Road excavation on permafrost soils containing ballast prism, located underneath the reference array in contact with the recess slopes of its lateral sides, and an insulating layer laid on the recess slopes, located on top of the protective layer, characterized in that oporn the second array contains made of fractional rocky soil the top layer of height h inand lower tier height hnmade of nijenrode ground, and a protective layer made of draining soil, the height of the reference array haboutthe height hinthe upper and hnthe lower tiers and the width innthe reference array is defined accordingly dependencies

habout= hin+ hn, m,

hin≥ 2.5 m,

hn? 0.5 m,

inn= p+ m2h0, m,

wherep- width of the foot support prism, m;

inin- width of the reference array on top, m;

m = 0,8 ÷ 1,2 - coefficient taking into account local conditions, b/R.



 

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FIELD: building, particularly for building railroad embankments in permafrost zones.

SUBSTANCE: groove includes ballast prism, support massif contacting with groove slopes by side massif walls and arranged under ballast prism, heat insulation layer laid on groove slopes and protective layer located above heat insulation one. Support body comprises upper part of hU height formed of fractional rock and lower part of hL height made of non-drainage ground. Protective layer is made of drainage ground. Support massif height h0, upper part height hU and lower part hL height are determined from corresponding relations.

EFFECT: prevention of road bed deformation during embankment erection.

1 dwg

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