SU1159981A1 - Method of consolidating sagging loess soil - Google Patents

Abstract

A METHOD OF SEALING A PASSING LESS GROUND, including a passage of contour and internal trenches, placing in the last elongated horizontal charges of explosive and granular filter material, soaking the soil with its subsidence under its own weight and carrying out a charge explosion, characterized in that, in order to increase the degree soil compaction, during soaking, the determination of the beginning of the subsidence of the soil surface is made, and the explosion of charges is carried out simultaneously with the beginning of the subsidence of the soil. (L O1; o; o T 00

Description

The invention relates to the construction, in particular to the compaction of subsided loess soils of the second type, and can be used in the preparation of the foundations and foundations of industrial-civil and hydraulic structures.

The purpose of the invention is to increase the degree of compaction of the soil.

FIG. 1 shows a plot with the location of the longitudinal and transverse drainage trenches, view; in fig. 2 shows section A-A in FIG. 1, at the time of wetting the compacted area; in fig. 3 the same, at the time of the deep explosions.

The scheme contains the compacted area 1, the non-compacted area 2, the subsiding soil in the unwashed zone 3, the subsiding soil in the soaked zone 4, the contour trenches 5, the longitudinal drainage-explosive trenches 6, the transverse drainage-explosive trenches 7, coarse-grained drainage material, the boundaries of the zone wetting soil, extended explosive charges, indicators, racks with holders, non-sinking soil.

The method is performed in the following sequence.

In section 1 of works with a compacted depth of depth, and, for example, 20 m, contour trenches 5 Hd with a depth of up to 6 m with help, and, for example, a deep trench digger or scraper ditch on the base of a drilling rig with an extended bed and fixed on its chain removable cutters or buckets. Then, the same mechanisms open the longitudinal 6 and transverse 7 drainage-explosive trenches to a depth of 6-7 m. The step between the drainage-explosive trenches is determined from the condition (with a square grid)

L RH V

RH, Kn V gl,

where RH is the radius of the zone of disturbance of the soil structure;

Kn is a coefficient determined experimentally (for soaked 5 molded loams it is assumed to be 2.45); . - coefficient of performance

explosives. At the bottom of the drainage-explosive trenches 6 and 7, elongated explosive charges are placed in a waterproofing shell, for example, polyethylene. Thereafter, drainage and explosive trenches 6 and 7 are filled with coarse drainage material, for example sand, pebbles or 5 gravel.

On the surface of the sealing area 1, with the help of racks with holders mounted on the non-sealing areas 2, indicators, for example, of the hour-type type, are installed to fix the beginning of the drawdown. 0 Soil fixing is carried out by supplying water to drainage and explosive trenches 6 and 7, which makes it possible to evenly moisten the soil throughout the entire thickened layer. Explosions of explosive charges are made one-time simultaneously with the beginning of the subsidence of the surface of the compacting area 1 from moisture, which is fixed by indicators. The initiation of explosions is performed automatically, for example, by means of an electrical circuit connected to the indicators. Simultaneously with the commencement of the process of sinking the compacted area 1 and the initiation of explosions, the water supply to the drainage and blasting trenches 6 and 7 is stopped. After the end of the blasting, the ground surface in the compacted area is lowered for a relatively short time.

The proposed method makes it possible to compact the sagging loess soils of the second type up to 20 m.

Using the proposed method. in practice, it allows to increase the degree of compaction of the soil in comparison with the known method by 5-6% and reduce the cost of work.

Claims (1)

METHOD FOR SEALING A LANDING FOREST SOIL, including a fragment of contour and internal trenches, placing explosives and granular filter material in the last elongated horizontal charges, soaking the soil with its subsidence under its own weight, and making charges explode, characterized in that, in order to increase the degree of soil compaction , during the soaking, the start of subsidence of the soil surface is determined, and the explosion of charges is carried out simultaneously with the start of subsidence of the soil. 7 2 FIG. 7