Road embankment with drainage groove

FIELD: building, particularly for building high filtering embankments on permafrost ground bases.

SUBSTANCE: road embankment comprises drainage groove body built on natural ground surface and approach embankment parts adjoining to drainage groove from both sides. Approach embankment parts include systems for permafrost ground cooling arranged on surfaces thereof formed, for instance, as rock fills arranged on embankment slopes. Drainage groove body consists of filtering mass crossing embankment body at an angle to longitudinal axis thereof, upper part located directly above filtering mass, and two intermediate embankment parts of variable heights disposed between filtering mass together with upper part of drainage groove body and both approach embankment parts. Filtering mass has trapezoidal cross-section. Ends of filtering mass, upper part and intermediate ones are located in planes of approach embankment part slopes. Filtering mass body is formed of filtering ground. Upper drainage slot part and intermediate parts are made of embankment ground.

EFFECT: possibility of regular embankment operation in permafrost areas.

4 cl, 3 dwg

 

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

Known mound, draining part of which is made of riprap. (Gamehunter “roadbed Railways”, Transgenderist, M., 1953, s, RES).

The disadvantage of it is that in the case of embankments in the area of distribution of permafrost degradation of permafrost.

Closest to the present invention is a filtering embankment, designed for use in the distribution of permafrost, in which is arranged a drainage slot, filled with stone (Sunushov “Engineering method of calculation of the filter embankments on permafrost foundations”, proceedings of the crid, No. 213, M, ZNIIS, 2002, p.137-144).

The disadvantage is the impossibility of application of such structures in embankments great height, as is the formation of the frozen core in the center of the mound and filtering becomes impossible.

The invention solves the task of ensuring the normal operation of the mound a great height with drainage slot on the distribution of permafrost.

To achieve the technical result in road embankment, containing built on the natural surface g is the flying boot body draining of the slot and adjacent to it on both sides of the approach areas of the mound, includes arranged on the surface of the system for cooling of permafrost, such as riprap on slopes, body draining slot consists of a filter array height hfcrossing the body of the embankment at an angle to its longitudinal axis, the upper part of the drainage slits, located directly above the filter array height hNRand two transition sections of the embankment, located between the filter array together with the upper part of the drainage slots, and both approach the parts of the embankment widthnand variable height from hNRto hnwhile the filter array in cross section has the form of a-line with a width of the upper and lower bases, respectively, inPEand intnand the ends of the filter array, the upper part of the drainage slits and transition sections of the embankment are located in the plane of the slope parts of the approach embankment, and the body of the filter array is made of filtering soil and the upper part of the drainage slits and transitional areas of the embankment is made of soil embankments, while

hNR=hn-hf,

inop=PE+2Vnm=4mhn,

whereop- overall width draining slots, m;

m - coefficient taking into account local conditions, equal to 1.0 in the absence of studies and less than 1.0 when available, b/R.

In addition, road embankment under the body of the filter array may be a layer of thermal insulation with a thermal resistance Rtapproaching form in plan to the shape with equidistant from its center at point (e.g. a circle) widthtand the center insulating layer and the center of the filter array in the plan are the same. The width of the insulation is determined from the expression

int=0,5m·RFP, m,

and the power of insulation from the expression

where l is the thickness of the insulation, m;

λ - coefficient of thermal conductivity of insulation, kcal/(m·h·hail);

F - area insulation in the plan, m2. When calculating the Rtthe value of F is assumed to be 1 m2.

The body of the filter array is divided by the height of the upper and lower tiers in height, respectively, hVyaand hnyawhile the array of the upper tier is made of rocky soil, and the array of the lower tier from fractional rocky soil, with the top and bottom layers from each other and from the rest of the drainage slits separated by a dividing layer of geotextile and

hNR=mhVya.

In the end walls of the filter array can be arranged cooling berms fractional rocky ground.

The proposed road embankment the performance is illustrated the drawings, which figure 1 shows a cross-section of the embankment with drainage slot (section I-I in figure 2);

figure 2 shows a mound with drainage slot in the plan;

figure 3 shows a cross-section of the drainage slits along the longitudinal axis of the embankment (section II-II in figure 2).

Road embankment approach consists of sections 1 embankment drainage slots 2 widthop. Mound designed to be applied on the permafrost, so the approach part of the mound contains system for cooling of permafrost, such as rock placement 3 on the slopes. Draining the slot consists of a filter array 4 height hfcrossing the body of the embankment at an angle and its longitudinal axis (in most cases at a right angle), the upper part 5 drainage slots located directly above the filter array 4 height hNRand two transition sections 6 embankment widthnand variable height from hNRto hnlocated between the filter array 4 together with the upper part 5 of the drainage slots, and both approach 1 the embankment. In the cross section of the filter array 4 has the form of a-line with a width of the upper and lower bases, respectively, inPEand intn. Both ends draining slot 2, including the ends of all three of its component parts are located in the plane of QCD the owls approach part 1 the embankment, so within the drainage slits General configuration of the mound remains. The body of the filter array made of the filtering surfaces, for example rock, and the upper part of the filtration slits and transitional areas of the embankment is made of soil embankments, but does not allow for intensive filtering. The main dimensions of drainage slots is determined from the following relationships:

hNR=hn-hf,

inop=PE+2RR=4mhn

whereop- overall width draining slot 2, m;

m - coefficient taking into account local conditions, equal to 1.0 in the absence of studies and less than 1.0 when available, m≤1,0, b/R.

To improve the performance of the embankment under the body draining slots fit the insulation layer 7 with a thermal resistance of Rtapproaching form in plan to the shape with equidistant from the center of the end points. Perfect view of such a shape is a circle, but may be made square, diamond, etc. the Center of the insulation and the center of the filter array in the plan are the same. The diameter of a circle or square side intequal to

int=0,5m·RFP, m,

where l is the thickness of the insulation, m;

λ - coefficient of thermal conductivity of insulation, kcal/(m·h·hail);

F - area insulation in the plan, m2. When calculating the Rtled is the rank of F is assumed to be 1 m;

inRFP- the width of the embankment foot, m

To increase the durability of drainage slits body of the filter array 4 can be divided by the height of the upper 8 and lower 9 tiers in height, respectively, hVyaand hnya. An array of upper layer made of ordinary rock soil, and the bottom of the fraction of the rocky ground. The upper and lower tiers from each other and from the rest of the filtration slits are separated by a dividing layer 10 of the geotextile. The height of the upper and lower tiers is determined from the ratio

hNR=mhVya.

To improve the temperature regime of soils reason in some cases can be applied cooling berm 11 of fractional rocky ground.

To clarify the essence of the invention is introduced in figure 1, 2, 3 the following items: 12 - direction of water flow, 13 - natural surface of the ground; 14 - position of the upper boundary of permafrost in the area of the drainage slots at the end of the warm period of the year in steady state.

Road embankment with drainage slot works as follows.

Water flows to the mound in the direction of 12, then passes through the filter array 4. The Foundation receives heat, which contributes to the thawing of permafrost grounds. To compensate for this it is necessary to provide the be the influx of cold soils. This cold can't do the above, because when the height of the embankment freezing of the soil over the entire height of the winter period. Therefore, the influx of cold is provided by the approach of part 1 of the mound. There is the upper boundary of permafrost at the end of the warm period of the year is in the body of the mound. For winter top thawing layer manages to freeze and cold enters the basis in the area of the approach embankment, and from thence into the Foundation soils beneath the drainage slot. Thus, the coldness of the Foundation soil under the draining slot comes not from the top, and the side - side approach side of the mound. In addition, if necessary, can optionally be arranged in the cooling berm 11, which will provide the increased influx of cold. Insulating layer 7 improves the temperature regime of soils reason - to prevent the flow of heat from the top and helps keep the cold draining directly under the slot.

Surrounded by soil with the presence of large quantities of dust components, i.e. ordinary soil used to backfill embankment, the filter array may be plugged. To improve the performance of the filter array of the most recently executed bunk. An array of top tier height hVyamade of ordinary rock soil. Its purpose is to provide a more blugaria the conditions for the main part (the lower level of height h nya) conditions preventing its securemote. Depending on local conditions, the height of the upper tier may change, but it should not exceed the height of the lower tier:

hNR=mhVya.

In addition to the separation into two layers to reduce the likelihood of clogging of the filter array, the latter is separated from the surrounding ground separating layer 10 of the geotextile.

The invention solved the following technical contradiction.

To ensure normal operation of the drainage slots on permafrost subsidence during thawing is necessary that, on the one hand, the body of the filter array in the summer was in a thawed state (i.e. so that it can pass water), on the other hand, in the winter period in the Foundation soils have been cold, so that during the winter the filter array is not only freezing, but missed out on the cold ground. At low embankments (up to 2 m) it is possible if the height of the mound about 3 feet and above, there are two possible States: either the lower part of the mound is in a thawed condition all year round, or frozen. In the first case, water filtration leads to additional heat, which can cause precipitation of the mound. The second filter is simply impossible.

The proposed solution provides filtering in the summer and the arrival of cold in the Foundation soils under renira slot in winter. This is achieved as follows: for the case when the embankment outside the draining of the slot provides a cooling effect (case when an embankment outside drainage slots contributes to the thawing of soils is not considered).

Mound within the draining of the slot is released from the cooling measures, for example, removed rock placement with slopes. Then within the drainage slits of the lower part of the mound is in a thawed condition all year round. The cooling base soil under drainage slot is due to the approach areas of the mound, where saved on the slope rock placement. However, the width of the drainage slots, when you met the above conditions, is limited to certain sizes.

Long-term studies conducted in Znoise, has allowed to establish the following relationship: soil temperature at any depth from the natural surface, equal to hn,provided the conditions at the boundary of the outside air and natural surface within the circle of radius R=2hn(Design and Foundation of bridge piers in the areas of distribution of permafrost. JV 32-101-95. M., 1996, p.39). Hence the dependence

inop=PE+2Vn=4mhn.

The temperature distribution along the depth before the lah body draining slots and forth in the soil of its grounds is sufficiently smooth, what if there is a positive temperatures in the area of water filtration will form under the body of the filter array temperature close to zero. This ability to deform such plastically soils is quite high. To lower the temperature, it is necessary to provide a larger temperature difference by stacking a layer of insulation under the body draining of the slot. Conditions of practice minimum insulation - 5 cm foam, which has a thermal resistance of. With increasing power, the temperature difference will increase. The result may be offered dependence

Insulation should not be placed across the entire width of the embankment, as in the area of the lower part of the embankment slopes during the winter, it completely freezes the ground to the bottom of the embankment.

The analysis of the temperature regime of the soil embankment allows for the dimensions of the layer of insulation in the plan to offer the following dependency:

int=0,5m·RFP.

The area of effective use of this invention the embankment with draining slot height of over 3 m in those cases, when in the approach areas of the mound applied cooling event type rock placement, which provide lift permafrost in the body of the embankment.

1. Road embankment, containing facilities is built on the natural surface of the ground body draining of the slot and adjacent to it on both sides of the approach areas of the mound, includes arranged on the surface of the system for cooling of permafrost, such as riprap on slopes, characterized in that the body draining slot consists of a filter array height hfcrossing the body of the embankment at an angle to its longitudinal axis, the upper part of the drainage slits, located directly above the filter array hNRand two transition sections of the embankment widthnand variable height from hNRto hnlocated between the filter array together with the upper part of the drainage slots, and both approach the parts of the mound, in the cross section of the filter array has the form of a-line with a width of the upper and lower bases, respectively, inPEand intnand the ends of the filter array, the upper part of the drainage slits and transition sections of the embankment are located in the plane of the slope parts of the approach embankment, and the body of the filter array is made of filtering soil and the upper part of the drainage slits and transitional areas of the embankment is made of soil embankments, while

hNR= hn- hf,

inop= PE+2Vn= 4mhn,

whereop- overall width draining slots, m;

m - coefficient taking into account local conditions, m ≤ 1,0 , b/R.

2. Road us the ro according to claim 1, characterized in that the under body of the filter array, a layer of thermal insulation widthtthermal resistance RTapproaching form in plan to the shape with equidistant from the center of the end points and the center of the insulation and the center of the filter array in the plan are the same, while

int=0,5m·RFP, m,

where l is the thickness of the insulation, m;

λ - coefficient of thermal conductivity of insulation, kcal/(m·h·hail);

F - area insulation in the plan, m2, F=1 m2.

3. Road embankment according to any one of claims 1 and 2, characterized in that the body of the filter array divided by the height of the upper and lower tiers in height, respectively, hVyaand hnyawhile the array of the upper tier is made of rocky soil, and the array of the lower tier from fractional rocky soil, with the top and bottom layers from each other and from the rest of the drainage slits separated by a dividing layer of geotextile, andhNR=mhVya

4. Road embankment according to any one of claims 1 to 3, characterized in that the end walls of the filter array arranged cooling berms fractional rocky ground.



 

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