SU1615285A1 - Method of erecting embankment - Google Patents

Abstract

The invention relates to mining and is intended to provide year-round construction of road embankments. The purpose of the invention is to increase the rate of construction of low mounds due to the compaction of the overmoistened soil in them. On the closest to the route of the open-pit mine or reserve, frozen, overmoistened soil is loose. A lump of overmoistened frozen soil is transported from a reserve and laid into an embankment with a void layer of 35–50%. Bulk drainage material whose volume is not less than the volume of voids in the underlying layer is introduced into the interflamous voids. Poured layers of vibroplates. Coarse and medium grained sands or slow hardening materials are used as a heterogeneous drainage material, and sandy, clayey and peat soils are used as loosened frozen wet soil. With the onset of the warm period, the surface of the embankment during the thawing process or after it is subjected to dynamic action by vibratory rollers, and then by road traffic. 5 hp f-ly, 2 ill.

Description

The invention relates to mining and can be used to provide year-round road embankment construction.

The purpose of the invention is to increase the rate of construction of low mounds due to the compaction of the overmoistened soil in them.

FIG. 1 shows a schematic mound erected by the proposed method; in fig. 2 - additional vibration resistant loading layer.

Pour 1 consists of frozen lumps of wet soil (draft) 2 and heterogeneous bulk draining material 3 (aggregate).

The method is carried out as follows. On the soil pit or reserve closest to the road, loosening of the frozen ground (drilling and blasting or mechanically) is carried out in the tundra regions of the north, which is usually in a highly waterlogged condition. An overmoistened frozen soil 2 (draft) is transported and placed in embankment 1 by bulldozers, and in an open-pit mine - into a pile, from where they are loaded into dump trucks, which are transported and dumped in draft 2 into embankment 1, after which it is leveled with a bulldozer a layer of 0.5 - 1.0 m for the required width.

Os

ate

fO CD

ate

The minimum size of the lumps of frozen, wet soil or the average diameter must be at least 30–50 mm, since the dimensions of the voids formed by smaller lumps do not provide penetration and large- and medium-sized sands. In addition, smaller lumps (chippings) often do not allow creating the necessary initial voidness in layer 2, providing void iMocTb of bulk draining material ((aggregate) 3 with joint vibro-freezing, and thawing such microcircuit (especially clay soil) contributes to clogging of drainage stock 3, which is undesirable.

Maximum sizes of frozen lumps of 300–400 mm are taken from the condition of efficient compacting of coarse-grained soils with vibratory rollers. ; The voidness of the laid layer, the outline of | 2, is determined by express methods based on the well method using nomograms. A layer of inhomogeneous bulk draining material (aggregate) 3 is laid on the surface of the layer with a volume of not less than the volume of voids in the underlying layer and the joint compaction of vibrated layers with vibrating rollers is carried out until the intermixture of voids in layer 2 is completely filled. Distributing properties, for example, due to the presence of 3 large inclusions in the Carrier, before ripping or simultaneously with it |) there is mixing (loosening) of the laid layers with a ripper, installed on a tractor or a heavy motor grader perazim laying and vibrocompaction ({: Loew repeated riprap mound up on non- fbhodimuyu height (3m).

In order to ensure the stability of the embankment, the vibro-dilution under dynamic action (vibrocompaction) during the period of thawing ensures the fulfillment of the following conditions.

When used as a placeholder 2 coarse- and medium-grained sands, the degree of their compaction (porosity) is not regulated in the mixture, since the latter, even with a porosity higher than the critical one, do not undergo dilution under dynamic impact, and the above operations ensure the creation of Communicating retaining frame.

When used as a filler, 2 fine-grained sands (most typical for tundra regions of the North), the degree of heterogeneity of which is less than 5, determine their porosity after vibroplating.

According to the schedule, the thickness of the vibration-resistant loading layer is required to ensure stability from dilution of aggregate 3 at 5 achieved porosity depending on frequency and amplitude (critical acceleration of vibrations) applied during the defrosting period of the vibration load of vibration-resistant loading vibration layer 4 It can be poured, for example, from sand with optimum or less moisture, or from coarse and medium sands and is a constructive layer of the embankment or poured for a while.

Claims (6)

15 With the onset of the warm period, embankment 1, as it is thawed or after complete defrosting, is compacted first with light (up to 3-4 tons) vibratory rollers coupled with crawler tractors, and then as far as compaction with medium and heavy vibratory rollers and the movement of technological vehicles. The thickness of the overmoistened soil layer, to which, with its effective vibratory hole, the cutting of modern vibratory rollers fluctuates on average from 3 to 4 meters, while vibro rollers create on average acceleration of vibrations from 16000 to 22000 mm / s. Compacted large- and medium-grained Sands and JU fine-grained with a porosity below 35% under the required static load remain resistant to vibro-liquefaction at a given acceleration, and unconsolidated water-saturated clay J5 peat and sandy soils begin intensively allocate excess water and tighten up at accelerations of 4000-8000 mm / s. Use as a bulk non-uniform drainage-iero filler 0 3 slow-hardening cementing materials with a degree of heterogeneity of at least 5 is most advisable in critical sections of embankments near culvert pipes and on areas with weak or ice-saturated bases, since these materials additionally have good thermal insulation properties. Claim 1. Method of construction of the embankment, including preparation of the base, loosening in a quarry or reserve of frozen wet soil, transportation, layer-by-layer laying, introduction of loose drainage material into the interflux voids, and defrosting, characterized in that, in order to increase the pace of construction - low embankments due to the compaction of the overmoistened soil in them layer-by-layer laying of frozen soil clods is carried out in an embankment with a hollowness of a layer from 35 to 50%, and a non-uniform loose drainage mat rial was applied to mezhkom cial voids in amount not less than the volume of voids in the underlying layer and vibratory rouplotn removed and the mound during thawing and / or after the thawing is carried out a dynamic action on the surface mound. 2. A method according to claim 1, characterized in that croup is used as a heterogeneous bulk draining material. but - and medium-grained sands. 3. A method according to claim 1, characterized in that a vibration-resistant loading layer is poured onto the surface of the embankment. 4. A method according to Claims 1 and 2, that is, with the fact that slow-hardening adhesives are used as the heterogeneous bulk draining material. 5. A method according to claim 1, characterized in that the dynamic impact on the surface of the embankment during the process of thawing the embankment is carried out by vibratory rollers and then by road traffic. 6. A way to pop. 1, characterized in that sand, clay and peat sands can be used as loosened, frozen, overmoistened soil. soils.