SU718541A1 - Method of consolidating clayey soils with earth-fill piles - Google Patents

Description

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The invention relates to the field of construction of buildings and structures on subsiding and bulk soils, in particular, to the deep compaction of clay soils with soil walls.

There is a method of deep compaction of subsiding and bulk soils with submerged soil, including punching wells in the ground to form a compacted zone around each of them and filling the wells with clayey soil with compaction tamping working body 1.

There is also known a method of compaction of clay soils with earth beds, mainly subsidence and bulk, which involves punching wells, filling them with local soil with layers of a height of 1.5-2.0 borehole diameters, with compaction by tamping 2.

The disadvantage of these methods is that the required increase in the volumetric weight of the soil in the lower part of the compacted array to 1.7-1.75 t / m makes it necessary to reduce the distance between the wells, which leads to a decrease in performance and bearing capacity of the compacted soil array .

The purpose of the invention is to improve the performance and carrying capacity of the soil.

This is achieved by the fact that in the method of compaction with clay soils, including punching wells, filling them with local soil with layers with a height of 1.5-2.0 diameters of the well, with compaction by compacting, before filling the wells with local soil, layering and compaction of low-compressible material to a depth equal to 0.3-0.5 of the depth of the well. In this case, the laying of the initial layers of low-compressible material is carried out with a height equal to 0.8-1.2 of the diameter of the well, and their compaction - to failure.

The technology for performing the described method is as follows.

In the compacted soil mass, vertical wells are punched into the bottom of which, to a depth equal to 0.3-0.5 of the well height, low-compressible material is laid, for example sand, gravel, crushed stone, slag, sand-gravel mixture. Laying is carried out in layers with a height equal to 1.5-2.0 diameters of the well, compaction of each layer by tamping, resulting in wedging of the material with an increase in the diameter of the well 1.5-1.8 times, and the compacted soil zone expands at

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1.4-1.6 times as compared with the upper part of the well sealed by a known method. When laying a low-compressible material, they are initially laid down relatively thin 3-5 layers with a height equal to 0.8-1.2 borehole diameters with tamping to failure, i.e., until the sealing surface descends. Due to this compaction mode, an additional expansion of the well is achieved with an increase in its diameter by 1.8-2.2 times, which ensures the creation of a contact layer with an increased bearing capacity with a height of 1.5 to 3 m.

The drawing shows a plot compacted by the proposed method of the array of soil.

The method is implemented as follows. On the surface 1 of the work site, to the depth of line 2, punch a hole 3 with a diameter of 0.425 m, which are initially filled with a sand-gravel mixture in layers of 0.4 m in height with compaction of each layer with the same ramming projectile with 12 strokes the further lowering of the layer is stopped, i.e., to failure. In total, there are 4 such layers. As a result, a reference broadening 4 is formed in the soil, which, together with the compacted soil zone 5, creates a contact layer 6. The subsequent layers of sand-gravel mixture are laid 0.7 m thick with compaction with a tamping projectile. The total height of the bottom 7 wells 3 is 0.45 of their depth.

Then the rest of the wells 3 are filled with local clay soil with a layer thickness of 0.7 m with compaction tamping projectile. When filling the bottom 7 and top 8 parts of the wells 3, sealing zones 9 and 10 are formed around them, and zones 9 around the bottom of each well 3 are practically adjacent to each other.

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to the other, while the distance between the wells 3 is increased 1.3 times compared with the known method when filling the wells 3 only with local clayey soil.

The use of this method of compaction of clay soils with subterranean soils provides the possibility of increasing the distance between wells 1.2-1.5 times, which helps to reduce the labor intensity of works 1.3-1.5 times, and their cost - 1.2- 1.4 times. In addition, the carrying capacity of the compacted array is increased 1.1-1.3 times.

Claims (2)

1. The method of compaction of clay soils, mainly subsiding and bulk, with the use of soil, including punching wells, filling them with local soil with layers with a height of 1.5-2.0 diameters of the well, with compaction with tamping, characterized in that and the bearing capacity of the soil, prior to filling the wells with local soil, layered lay-up and compaction of the low-compressible material to a depth equal to 0.3-0.5 of the depth of the well. 2. A method according to claim 1, characterized in that the laying of the lower layers of low-compressible material is carried out with a height equal to 0.8-1.2 of the diameter of the well, and their compaction to failure. Sources of information taken into account in the examination 1. Guidelines for the design of foundations and structures. M., stroiizdat, 1977, p. 267-270. 2. Sealing subsidence soils. Ed. V.I. Krutov, M., Stroyizdat, 1974, p. 173-178.