RU2191866C2 - Method of landslide slope consolidation - Google Patents

Abstract

FIELD: construction engineering and mining; applicable in consolidation of slopes formed by unstable grounds. SUBSTANCE: method includes driving into ground through landslide boundary of steel electrodes with formation of pile round electrodes. Novelty consists in that stable ground, landslide boundary and layer of unstable ground are punctured by pipe accommodating at least one rope and one additional pipe. Rope and additional pipe external ends on side of landslide slope are secured. Pipe of large diameter is withdrawn from ground, injection material is injected into additional pipe, and simultaneously, additional pipe is withdrawn from ground with formation of pile round rope. EFFECT: increased consolidation of slope and efficiency of cohesion of surface layers of landslide ground with underlaying layers at any angles of introduction of electrodes into ground. 3 deg, 5 dwg

Description

 The invention relates to the fields of construction and mining and can be used to strengthen slopes and slopes formed by unstable soils.

 Currently, in the practice of construction there are a large number of anti-landslide structures, the main of which are holding structures made of bored piles, retaining walls, anchor structures, anchor walls and piles, etc.

 Each of the above structures has an optimal field of application, determined by the type of landslide, the physicomechanical properties of landslide soils and soils located below the sliding surface of the landslide, the power of landslide accumulations, etc.

 There is a method of attaching a slope, including laying in a row on a slope surface slabs with flexible connections in the form of cables connecting sets of slabs to each other (USSR copyright certificate 1670043, class E 02 D 17/20).

 The main disadvantage of this method is that the system implementing the method can only hold a surface landslide.

 The closest in essence and the technical result achieved is a method of strengthening landslide slopes, including immersion in the soil through the landslide boundary of steel electrodes with the formation of piles around them (see RF patent 2080441, class E 02 D 17/20, 05.27.1997).

In variants of this known method, the electrodes are isolated at a certain length, and also immersed at an angle of 15-90 ^o to the slope.

The disadvantage of this method, selected as a prototype, is that it does not provide effective adhesion of the sliding soil layers to the underlying ones, as well as the fact that when steel electrodes are immersed to a certain depth in the soil below the landslide boundary, a torque appears that turns the electrochemical pile. In addition, when immersing the electrodes at an angle of less than 15 ^o to the slope, it is difficult to control the specified depth of immersion of the steel electrode in the soil layer.

 The aim of the invention is the elimination of these shortcomings.

 The technical result of the invention is achieved due to the fact that in the method of strengthening landslide slopes, including immersion in soil through a landslide boundary of steel electrodes with the formation of piles around them, according to the invention, a stable soil is pierced by a pipe, the landslide boundary and a layer of landslide soil are placed in the pipe at least one cable and one additional pipe, fix the ends of the cable and the additional pipe external from the landslide slope side, pull the larger diameter pipe out of the ground, pump it into an additional a pipe is an injection material and at the same time an additional pipe is removed from the soil with the formation of piles around the cable.

 The injection of injection material can be done at certain time intervals.

 After completion of the pile formation process, the ends of the cable can be fixed in plates located on the surface.

 The invention is illustrated graphically, where in Fig.1, 2, 3, 4 and 5 shows the various stages of the method.

 The method is as follows.

 In FIG. 1 shows a layer of landslide layer of soil 1, stable soil 2, the boundary of landslide 3 and pipe 4.

 At the first stage of the implementation of the method (Fig. 1), a pipe 4 is punctured from the side of stable soil 2 so that the end of the pipe passes through the boundary of landslide 3 and the layer of landslide layer of soil 1.

 The technique of soil puncture with a pipe is known and has been implemented at Yuzhtruboprovodstroy OJSC for many years, therefore it is not described in the application materials.

 Then, at least one cable 5 and an additional pipe 6 are inserted into the internal cavity of the pipe 4. In this case, the ends of the cable and the additional pipe protrude above the ground surface (Fig. 2). The technique for introducing a cable and an additional pipe into the internal cavity is known and is not given in the application materials.

 The ends of the cable 5 and the additional pipe 6 protruding from the landslide side of the slope are temporarily fixed and the pipe 4 is pulled out of the ground.

 Then, injection material is started to be pumped into the pipe 6 (along arrow 7 in FIG. 3) and at the same time an additional pipe is removed from the soil (the direction of extraction is shown by arrow 8 in FIG. 3). Injection material fills all the cavities in the soil and forms a continuous pile with a developed surface, connecting the soil and the cable. As an injection material, for example, Soil hydroactive polyurethane from De NEEF can be used, which foams upon contact with water, increasing in volume. In the Russian Federation, the above hydroactive composition is supplied by the Moscow company Triada-Holding.

 Hydroactive polyurethane composition with low viscosity when interacting with water contained in the soil, increases in volume several times and polymerizes within a few minutes, forming a rigid sealed polyurethane foam, resistant to weak acids, alkalis and microorganisms. Known areas of application of the composition: to stabilize and strengthen incoherent soils; increase the bearing capacity of foundations and pile foundations; for rock anchoring, etc.

 The method also consists in the following. At least one chain and an additional pipe 6 are introduced into the internal cavity of the pipe 4. The remaining operations of the method are repeated.

 The method also consists in the following. The additional pipe 6 is removed from the soil, while the injection material is pumped into the pipe 6 at certain time intervals. In this case, in the soil separate sections of piles 9 are formed (Fig. 4), connecting the soil and the cable. The values of the time intervals depend on the properties of the soil, the power of the landslide and the speed of extraction of the additional pipe 6.

 The method also consists in the following. A direct current source is connected to the steel electrode 5 and a current is passed through the electrode until the end of the process of electrochemical corrosion. In this case, additional fixing of the previously formed piles in the soil occurs.

 The method also consists in the following. The process steps described above are repeated, and then after completion of the pile formation process, the ends of the cable are fixed in plates 10 located on the surface (Fig. 5).

Puncture soil with a pipe can be made at any angle from 0 to 90 ^o . The rows of piles formed can be located at different distances from each other, based on the characteristics of the landslide slope.

Claims (3)

 1. A method of securing landslide slopes, including immersion in the soil through the landslide boundary of steel electrodes with the formation of piles around them, characterized in that they pierce stable soil, the landslide boundary and the landslide layer, place at least one cable and one additional pipe in the pipe , fix the ends of the cable and the additional pipe external from the landslide side of the slope, pull the larger diameter pipe out of the ground, inject material into the additional pipe and at the same time remove the additional ground pipe with the formation of piles around the cable.  2. The method according to claim 1, characterized in that the injection of injectable material is carried out at certain time intervals.  3. The method according to claims 1 and 2, characterized in that after completion of the pile formation process, the ends of the cable are fixed in plates located on the surface.

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