RU2191865C2 - Method of landslide slope consolidation - Google Patents

Abstract

FIELD: construction engineering and mining; applicable in consolidation of slopes formed by unstable grounds. SUBSTANCE: methods includes driving of steel electrodes into ground through landslide boundary and their partial decomposition under effect of direct current with formation round them of electrochemical pile. Novelty consists in that stable ground, landslide boundary and ground in landslide layer is punctured by pipe. Located in pipe are at least one rope and steel electrode made in the form of steel rod, or steel pipe, or in the form of additional steel rope. Rope and electrode external ends on side landslide slope are secured, pipe is withdrawn from ground and direct current from current source is passed through electrode up to completion of process of electrochemical corrosion with formation of zone for rope fastening in ground. EFFECT: increased strength of slope and higher efficiency of cohesion of surface layers of landslide ground with underlaying layers. 3 cl, 3 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 Author's 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 and their partial decomposition under the influence of direct electric current with the formation of an electrochemical pile 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 the soil through the landslide boundary of steel electrodes and their partial decomposition under the influence of direct electric current with the formation of an electrochemical pile around them, according to the invention, they pierce a stable soil, the landslide boundary and the soil in the landslide layer, place at least one cable and a steel electrode in the pipe, made in the form of a steel bar or steel pipe, or in the form of ceiling elements steel cable is fixed by the outer ends of the landslide slope cable and the electrode, the tube is pulled out of the ground, passed through a constant current from the current source electrode to complete the electrochemical corrosion process to form the cable fixing zone in the ground.

 Also, the technical result of the invention lies in the fact that in some parts of the steel electrode a current-insulating material can be previously applied.

 After completion of the process of electrochemical corrosion, the ends of the cable and electrode can be fixed in plates located on the surface.

 After completion of the process of electrochemical corrosion, the ends of the cable and electrode are fixed in plates located on the surface.

The invention is illustrated graphically, where:
figure 1, 2 and 3 show the various steps of the method.

 The method is as follows. Figure 1 shows the layer of the landslide layer of soil 1, stable soil 2, the boundary of the landslide 3 and the 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 a steel electrode 6, made in the form of a steel bar or steel pipe, or in the form of an additional steel cable, are introduced into the internal cavity of the pipe 4. In this case, the ends of the cable and the steel electrode protrude above the surface of the soil (figure 2). The technique for introducing a cable and a steel bar into the inner cavity is known and is not given in the application materials.

 The ends of the cable 5 and the steel electrode 6 protruding from the landslide side are temporarily fixed and pulled out of the ground pipe 4. Then, a direct current source is connected to the steel electrode 6 and a current is passed through the electrode until the end of the process of electrochemical corrosion. When this occurs, the electrochemical decomposition of the material of the electrode 6 and the anchoring of the electrode 6 and the adjacent cable 5 with decomposition products with the formation of an extension zone along the entire length of the electrode in the soil 8 (Fig. 3).

 The method also consists in the following. A layer of a current-insulating material 7 (a plastic or rubber sheath, rubber-bitumen or other mastic, etc.) is preliminarily applied to separate sections of the electrode 6, as shown in Fig. 2 (position A).

 Then, at least one cable 5 and a steel electrode 6, made in the form of a steel bar or steel pipe, or in the form of an additional steel cable, in some sections of which a layer of current-insulating material 7 is applied, are introduced into the internal cavity of the pipe 4. steel electrode protrude above the surface of the soil (figure 2).

 The ends of the cable 5 and the steel electrode 6 protruding from the landslide side are temporarily fixed and pulled out of the ground pipe 4. Then, a direct current source is connected to the steel electrode 6 and a current is passed through the electrode until the end of the process of electrochemical corrosion. When this occurs, the electrochemical decomposition of the material of the electrode 6 in non-insulated areas and the anchoring of the electrode 6 and the adjacent cable 5 with decomposition products with the formation of a consecutive series of fixing zones in the soil 8 (Fig. 3, position B).

 The method also consists in the following. A layer of current-insulating material 7 is preliminarily applied in separate sections of the electrode 6 so that the non-insulated section of the electrode 7 intersects the boundary of the landslide 3. Then, the previously described steps of the method are repeated.

 The method also consists in the following. The steps of the method described above are repeated, and then after completion of the electrochemical corrosion process, the ends of the cable and electrode are fixed in plates 9 located on the surface (Fig. 3).

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

Claims (3)

 1. A method of strengthening landslide slopes, including immersion in the soil through the landslide boundary of steel electrodes and their partial decomposition under the influence of direct electric current with the formation of an electrochemical pile around them, characterized in that they pierce stable soil, the landslide boundary and the soil in the landslide layer, place in the pipe, at least one cable and a steel electrode made in the form of a steel bar, or a steel pipe, or in the form of an additional steel cable, fix the landslide side external slope ends of the cable and the electrode, the tube is pulled out of the ground, passed through an electrode constant current from a current source to complete the electrochemical corrosion process to form a fastening zone of a cable in the ground.  2. The method according to claim 1, characterized in that the current-insulating material is preliminarily applied to separate sections of the steel electrode.  3. The method according to claim 1 and 2, characterized in that after the completion of the process of electrochemical corrosion, the ends of the cable and electrode are fixed in plates located on the surface.

Images