SU1758161A1 - Method of consolidating sagged loessial soil - Google Patents

Abstract

Use: compaction of subsurface soils for foundations and foundations of buildings and structures. SUMMARY OF THE INVENTION: the formation of counter-inclined wells, the placement of linear charges into them (this substance and the exploding of charges with sediment of the soil under its own weight. Before the formation of wells, parallel trenches are torn off, and the formation of counter-wells is led from pairs of trenches at an angle of 20 30 ° to the horizon with the intersection of their projections on the vertical plane. 2 ill., 1 tab.

Description

The invention relates to the construction, in particular to the preparation of the bases of buildings and structures on subsiding soils by compacting them with explosion energy,

A known method of compaction of subsurface soils, including the blasting of charges placed in a compacted massif in counter-inclined wells,

The disadvantage of this method is that inclined wells drill at arbitrary angles, including in deep wet layers of the array, as a result of which collapse of camouflet cavities formed by the explosion of charges is not guaranteed.

The closest to the invention is a method for compacting subsidence loess soils, including the formation of inclined wells oriented axes into the compacted massif, placing explosive charges in them and blasting the charge with sediment under its own mass. . The disadvantage of this method is that it does not allow to form a flat

wave front parallel to the free surface, which reduces the uniformity of the soil subsidence in depth.

The aim of the invention is to improve the uniformity of the subsidence of the soil in depth.

The goal is achieved in that according to the method, including the formation of counter-inclined wells, placing linear explosive charges in them and blasting charges with sediment of the soil under its own weight, prior to the formation of wells, passages of parallel wells are formed from trenches at an angle of 20–30 ° to the horizon with the intersection of their projections onto the vertical plane.

FIG. Figure 1 shows schematically a compacted array, a vertical section; in fig. 2 - the same plan.

The drawing shows inclined wells 1, auxiliary trenches 2 and the surface of the soil mass 3.

V4

sl with

a os

wth

The proposed method is implemented as follows. Along the edges of the compacted array, two parallels of the first trench 2 are up to 1.5 m wide and 3-3.5 m deep. The distance between the trenches is determined from the expression

O.TBNpr - Ntr

cos “where Npr is the thickness of the subsidence, m;

NTR - trench depth, m; “- angle of well inclination, hail.

From the bottom of the trenches towards each other in a staggered order at a given angle with a step of 2.5-3.0 and drilled, for example, with a pneumatic punch of a well. Continuous explosive charges are placed in the wells. The linear mass of charge, depending on the thickness of the subsidence, is 4-8 kg / m.

After the wells are charged, the trenches are dug into the soil. The charge system operates under camouflage conditions without ground spreading. After blasting charges

five

0

five

The trenched soil massif compresses uniformly.

The table shows data on the effectiveness of compaction of loess soils by the proposed method in comparison with the method according to ed. St. N °. 572094. As can be seen from the above data, the largest values of the soil skeleton density (1.65-1.76 g / cm3) were obtained at well inclination angles in the range of 20-30 °

Claims (1)

Claims. The method of compaction of drawdown loess soils, including the formation of opposing inclined wells, placing linear explosive charges in them and blasting charges with sedimentation of the soil under its own weight, characterized in that, in order to improve the uniformity of the subsidence of the soil in depth, before the formation of wells, the passage of parallel trenches, and the formation of oncoming wells lead from the trenches in pairs at an angle of 20-30 ° to the horizon with the intersection of their projections on the vertical plane. / Y / W / 7, Fig 1 rtr Figs f .