SU1125331A1 - Method of compacting sagging soils - Google Patents

Abstract

1 METHOD FOR SEALING GROUNDING GROUNDS, including drilling wells, placing explosive charges in them, filling wells with drainage material, soaking the soil to a fluid consistency and blasting explosive charges, characterized in that to ensure uniform depth of the soil depth of the compacted layer by increasing the degree of realization of the energy of the shock wave, before soaking the soil, and after it the compressed air is injected into the soil, the charges are placed in the range of 0.3-1.0 of the height forward layer, and their blasting is produced periodically at intervals of t with 0.01-12 2. The method of claim. I, characterized in that during soaking the ground last, compressed air is injected.

Description

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The invention relates to the construction of foundations and foundations on subsiding loess soils by compacting them with explosive energy.

The soil compaction method is known, which includes drilling wells, placing explosive charges in FiHx, soaking the soil to the optimum moisture content, and for explosive 1).

Most b.i, to the invention of the owner ots method yii. W) funded loess bastards | -pyirroB, them. young K) shchi and drilling: wells, placement in iuix () d () in explosives, filling of wells with drainage material: i) m, wetting the soil to a fluid condition and blasting charge ;; , s explosive substance 12.

The disadvantage of these methods is a significant variation in the degree of density, but the depth of the soil layer being compacted (I 1.7-1.8 in the lower layers and up to 1.3-1.5 g / cm in the upper layers, while the upper layer is at a depth of 3 --4 remains in the loosened state, which is due to the incomplete realization of the energy of the shock wave due to the explosion of explosive charges.

The purpose of the invention is to ensure uniform strength of the soil over the depth of the compacted layer by increasing the degree of realization of the energy of the shock wave.

This aim is achieved in that cornacfj (j ui.lotieni method prosadochnyh IpyiiTOH, comprising drilling, pa3.vieiueiiHe therein neHiecTBa explosive charge filling material drepnruyun1im wells soaking c) to a fluid state and kogsistentsni vzryva.chie explosive charge Before soaking the ground and after it, compressed air is injected into the ground, the charges are spaced within 0.3 -1.0 heights of the compacted layer, and their extraction is performed periodically with an interval of 0,0112 s.

At the same time, during the soaking of the soil, compressed air is injected into the day.

The essence of the method is the accumulation of potential energy in a compacted soil layer by injecting a calculated amount of water and air into the ground space and realizing energy during periodically repeated underground explosions. From periodically repeating underground blast waves with an interval of 0.01 -12 seconds, the potential energy of water and compressed air begins to vibrate with the subsequent vibro-dilution and vibro-boiling compacted soil mass. In this case, it may be injected before the soil is soaked or before and during the period of soaking, as well as after soaking before the explosions, charges with the same final compaction effect. Together; compressed air can be injected

a mixture of gases, such as CO2, O. and N, and other similar components of IRP at an overpressure of 0.1–18 kgf / cm. The amount of air is injected at the rate of filling 10–70% of the pores of the compacting layer, and when soaking it fills 30–90% of the pores.

After completion of explosions, the soil surface is freed from water and compacted by conventional means of compaction or compacted by blasting underwater explosive charges, for which a layer of water is created above the soil surface. Simultaneous injection into the ground of water and air is also carried out. For this purpose, a water-air mixture with an amount of air in it of 40% is prepared, which is filled with 60% of the compacted soil layer.

As a result of the realization of the potential energy of injected air and water during the implementation of periodic explosions of explosive charges, the soil surface sinks to a depth of up to 20% of the thickness of the compacted layer of subsiding soils, providing a high degree of compaction that is uniform throughout the depth

5 layers

Example. Absorbing and blasting wells have been drilled in the compacted soil massif, which are filled with drainage materials. (Slag, sand, crushed stone, etc.). The depth of the wells and the distance between them are based on a well-known calculation depending on the preliminary. but certain filtration coefficients of compacted soil in the vertical and horizontal directions. At the same time, the time required to soak the subsidence of the soil is equal to the time of wetting of the intervals of soil between the wells.

At the mouth of the drilled wells, pipes are installed for supplying water, air and for lowering explosive charges to the required depth. Surface and depth marks were set to observe the leveling of the ground.

5 Boreholes are installed with water resistant explosive charges weighing 20 kg in two vertical locations with a total height of 0.3, 0.6 and 1.0 heights of the layer to be compacted. Compressed air is pumped into the soil through the wells under excessive pressure. 18 kgf / cm;

 This ensures leaktightness at the wellhead, and also provides for the search for filtration of air onto the surface of the soil to be compacted. Then, the wires are fed into the wells through the separating inventory pipe5, water is pressurized under pressure and the soil is soaked to a fluid consistency. The amount of water needed for soaking is calculated based on the actual porosity index and the natural moisture of the soil being compacted. The water is filled with the pores of the compacted strata of the subsiding soil.

After soaking the soil, compressed air is again injected into the wells and it dries out, and periodically repeated underground explosions are detected. The time interval between the explosions is 0.01, 1, and 12 s, which is determined on the basis of experimental data depending on the accumulated potential energy of water, air, and the quality of explosives.

As a result of the explosions, a uniform subsidence of the soil surface occurs at 15% of the height of the layer being compacted. After 20 days a complete stabilization of the sediment occurs, which is 20% of the thickness of the compacted array. After completion of blasting, the surface is removed.

the water is immediately compacted by the upper loose soil layer by intensive rolling.

The application of the proposed method will ensure the draft of compactable loess soil up to 80% or more, which creates an equal strength array over the entire depth. The injection of compressed air also contributes to a 10–30% reduction in the consumption of explosive, the total cost of the work is reduced by 7–12%.

The proposed method can be applied for additional consolidation of previously wetted soils, acceleration of the process of precipitation of foundations of buildings and structures erected on previously soaked soils, as well as for leveling uneven settlement of buildings and structures.

Claims (2)

1. METHOD FOR SEALING LAYING SOILS, including drilling wells, placing explosive charges in them, filling wells with drainage material, soaking the soil to a state of fluid consistency and blasting explosive charges, characterized in that, in order to ensure uniform soil strength along the depth of the compacted layer by increasing the degree of realization of the energy of the shock wave, before soaking the soil, and after it, compressed air is injected into the soil, charges are placed within 0.3-1.0 of the height of the compacted about the layer, and they are blown up periodically with an interval of 0.01-12 s 2. The method according to π. 1, characterized in that during the soaking of the soil compressed air is pumped into the latter.