SU1435684A1 - Method of deep shore consolidation, composition for producing annular screen in this method and method of producing this composition - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to increase reliability and reduce costs when bank protection of poorly permeable soils. A well 3 is inserted into the casing from the surface of the soil 1 and an injection pipe is inserted into the casing pipe coaxially. The gap between the casing and the injection pipe is filled with a hardening -1m material 5 with a constant fixed strength after hardening. As the hardening material 5 sets in, a casing and injection pipe is removed from the well 3.

Description

.

WITH

ate

about

00 4

in the well 3 (they form an annular shield of hardening material 5, then the injector 6 is lowered into the well 3 to the desired depth with the pair of seals 7 through which the fixing mixture 8 is injected. When a certain fixed pressure is reached, the cavity is limited in height 9 of the annular screen fracture it. Composition to form an annular screen with

Constant fixed strength is prepared from 45-55% formaldehyde resin, 30-40% bentonite clay support with the addition of 0.4-0.7% oxalic acid and water. When preparing the composition, first mix the bentonite clay powder and formaldehyde resin, as well as oxalic acid and water, and then these solutions immediately before use. connect, 3 s, p-. f-ly, 4 ill.

The invention relates to hydraulic construction and relates to a deep bank protection by means of the injection of anchoring mixture into the ground.

The purpose of the invention is to increase the reliability and reduce the saturation at bank-strengthening of low-permeable soils.

Fig. 1 shows drilling drilled and the device in it is an annular screen; Fig, 2 - the implementation of the lower fracture of the soil; in fig. 3 - implementation of hydraulic fractures of the soil along the entire height of the well; Fig, 4 - the final form of fortified soil

The proposed bank protection method is carried out as follows.

Under the protection of the casing 2, a well 3 is drilled from the soil surface I, into which the injection pipe 4 is inserted coaxially with the casing 2, the gap between the casing 2 and the injection pipe 4 is filled with hardening material 5 with a constant fixed strength after hardening. As the hardening material 5 sets in, the casing 2 and the injection pipe 4 are removed from the borehole 3, and an annular shield of the hardening material 5 forms in the borehole 3,

After that, the injector 6 is lowered into the well 3 to the desired depth. With dual seals, / f, through which

no fixing mixture o.

With the completion of a certain fict. the surge pressure in the circumferential screen 9, which is limited in height, is fractured, after which the subsequent injection is carried out

0

five

0

a fixing mixture 8 is injected into the priming array until a ring screen is created in the confined cavity 9 equal to the fracture pressure.

After these operations, the injector 6 with twin seals 7 is rearranged to the desired height, and all operations are performed again until the soil is fixed along the entire height of the well 3. At the end of the work, the entire cavity inside the annular screen is filled with cement mortar.

The composition for forming an annular screen with a constant fixed strength is prepared from 45-55% formaldehyde resin, 30-40% bentonite mud powder with the addition of 0.4-0.7 oxalic acid and water,. . bentonite clay powder and formaldehyde resin, as well as oxalic acid and water are first mixed separately, and then these solutions are combined immediately before use.

Claims (1)

1. A method of deep bank protection, including the formation of a well, the installation of an injector in it and the injection of a fixing mixture into the ground, the purpose is to increase the reliability and cost savings in case of bank protection of weakly permeable soils, before installing the injector in the borehole, an annular shield of hardening material is created with a constant fixed after hardening. strength and modulus of deformation, ranging from 1.5-3.0 from the deformation modulus of the soil to be reinforced, after which the fracture of the annular shield and the surrounding soil massif is carried out by injecting the anchoring mixture inside the annular shield into a restricted height area, with This fixes the fracture pressure by a sharp drop in the injection pressure and produces a subsequent injection into the soil mass of the fixing mixture, during which pressure is gradually increased by increasing the viscosity of the fixed This subsequent injection ends when the pressure reaches a value equal to the value of the fracture pressure. 2, Composition for the formation of an annular screen in the implementation of the method of deep bank protection, including formaldehyde resin and oxalic resin  U.2.f acid, characterized in that it additionally contains bentonite mud powder and node in the following ratio of components, wt.%; Formaldehyde resin45-55 Bentonite mud powder 30-40 Oxalic acid 0, 4-0,7 Water Else 3. The method of preparing composition 5 to form an annular screen in the implementation of the method of deep bee, reinforced, including mixing of the components, characterized in that Mixing the bentonite clay powder with formaldehyde resin and oxalic acid with water, after which these solutions are mixed. 6 one U2.3 f. . .  9u.z.