RU1791536C - Method for removal of soil subsidence - Google Patents

Abstract

Usage: increasing the strength of subsidence soils by soaking them. The essence of the invention: carry out the construction of a compacted cushion, the formation of wells, filling them with filter material, supplying water to them with soaking an array of soil and its sediment under its own weight. Wells form to a depth not exceeding the thickness of the subsidence array. Water is supplied under pressure until the subsidence of the soil surface is not more than 0.7 possible, then the wells are sealed. Soaking is carried out to a degree of humidity not exceeding 0.75.

Description

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The invention relates to construction on subsiding soils.

A known method of eliminating subsidence properties of the soil, including a fragment of the pit, drilling within the area of the pit of the wells, filling them with drainage material and supplying water to the pit with soil soaking.

The disadvantage of this method is the duration and incomplete elimination of subsidence properties of the soil thickness, significant costs for soaking due to the large water consumption for evaporation from the pit, and waterlogging of the surface soil layer.

Closest to the proposed one is a method of eliminating subsidence properties of the soil, including tearing off a foundation pit, laying a drainage layer on its bottom and erecting a compacted soil cushion on it and loading it with inventory loads, drilling wells, filling them

filtering material and water supply to the pit with soil soaking.

The disadvantage of this method is the duration and incomplete elimination of subsidence properties of the soil, significant costs for the construction of the drainage layer, loading the compacted soil cushion with invert loads, followed by its unloading.

The purpose of the invention is to increase the effectiveness of soil hardening.

The goal is achieved in that in a method including the construction of a compacted soil cushion, the formation of wells, filling them with filter material, the supply of the estimated amount of water is carried out through the gates, which are arranged in the upper parts of the wells, under the pressure that is additional to atmospheric pressure during the time in which the subsidence of the surface of the soil will not exceed 0.7 possible, after which the wells are sealed. At

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this length of the wells does not exceed the depth of the subsidence, and the estimated amount of water saturates the soil to a moisture content of not more than 0.75.

There is a method of compacting subsidence loess soil by soaking it through wells using an injector, which are lowered to the full depth of the sealed area and raised with the simultaneous supply of steam through it, and when reloaded and raised, hot water is supplied with a temperature of 70-90 ° C containing an additive of acid, for example, hydrochloric acid in an amount of 1-2%.

The known method has low efficiency due to the length of the soil hardening process, since work can be performed simultaneously on a small number of wells. The method is busy, consists of a large number of heterogeneous operations, roads, requires steam, hot water, acid, special equipment, and the like. When water is supplied to the soil under pressure through injectors, the walls of the wells will melt and muddle, as a result of which the filtration properties of the soil will decrease and the process of hardening will be further lengthened.

In the proposed method, water under additional pressure is simultaneously supplied to the group of wells and penetrates the soil through the filter material. Thereby, the elimination of subsidence properties of the soil is accelerated and the walls of the wells are not drained.

 There is a known method of constructing foundations on subsidence soils, including the formation of wells, filling them with filter material and dividing into two groups of wells with the location of wells of one group between wells of another, compaction of the soil by soaking through one group of wells.

The known method has a low efficiency of eliminating subsidence properties of the soil due to the low speed and incomplete elimination of subsidence properties of the soil, since water is supplied to only one group of wells and without additional pressure. In addition, the method is expensive, since it requires the construction of a large number of wells.

In the proposed method, the calculated amount of water is supplied under additional pressure during the time in which the surface sediment thickness of the soil does not exceed 0.7 possible. Water supply under these conditions, which is confirmed by field experiments, leads to a sharp increase in the development of subsidence in the initial period of its

development. In this case, the amount of surface precipitation in the case of soaking by the proposed method, in comparison with soaking without additional water pressure, will increase 5-1.2-1.4 times, and its speed in the initial stage of development of subsidence from 2 to 4 times. After applying the calculated amount of water to the soil under additional pressure, it moves down and in the soil layers,

0 within the length of the well, a vacuum develops, which contributes to the development of subsidence and increase the efficiency of eliminating subsidence properties of the soil. In order to avoid air leaks from

5 wells and a decrease in vacuum in the soil layers, the wellhead is sealed. It was also established by experiments that water saturation of the soil to a degree of moisture greater than 0.75 leads to a significant

0 a decrease in the rate of development of surface sedimentation and its final value.

By virtue of the above, the claimed method has properties that do not coincide with the properties of known solutions, then

5 there is a proposed method has significant differences.

The method is as follows

In the area of liquidation of subsidence

By soaking the soil thickness by soaking, a compacted soil cushion is erected, for example, by known mechanical compaction methods. Then the wells are drilled and their lower parts are filled

5 with filtering material, and in the upper parts they arrange gates through which water is supplied under additional to atmospheric pressure. The gates serve to maintain the additional pressure of water in the wells. The value of the additional pressure is determined from the condition that the calculated amount of water must be supplied before the development of surface sedimentation of not more than 0.7 possible. Estimated quantity

5 water is determined by a known method from the calculation of soil saturation to a moisture content of not more than 0.75.

After the calculated amount of water is fed into the soil, the wells are sealed, for example, by sealing the gates.

The implementation of the proposed method will significantly increase the effectiveness of the elimination of subsidence properties of the soil by increasing the rate of development of subsidence deformation in the initial period of its development, the complete elimination of subsidence properties of the soil and reduce costs.

Claims (1)

SUMMARY OF THE INVENTION A method for eliminating subsidence properties of a soil, including erecting a compacted soil pad, forming wells, filling them with filter material and supplying water to them with soaking the soil mass and its sediment under its own weight, characterized in that, in order to increase the efficiency Hardening of the soil, the formation of wells is carried out to a depth not exceeding the thickness of the subsidence massif, and water is supplied under pressure to a precipitation value of the soil surface of not more than 0.7 possible, after which the wells are sealed, soaking is carried out to a degree of humidity, not exceeding 0.75.