Method of strengthening the slopes of embankments

 

The invention relates to mining and can be used to increase the height of the embankments of earth structures and capacity dumps while maintaining the stability of these arrays. Method of strengthening the slopes of embankments is the reinforcement of the soil in the body in layers otsypannoy embankment. What's new is that in the process of dumping mounds of cloth reinforcing material to form a closed loop, covering the slope and having a prismatic shape, with the edges of the panels connect via the elastic element, creating in the upper part of the contour of the tension force. The technical result of the invention is to improve the degree of mechanization of work, reduction of labor intensity, improve working conditions, reduce material consumption of the circuit elements of the reinforcement and acceleration of the process of filling the embankment. 3 Il.

The invention relates to the field of mining industry and can be used to increase the height of the embankments of earth structures and capacity of piles, formed at the open development of rocks.

Closest to the present invention is the Method of construction of the embankment (see and.with. The USSR №844689, CL E 02 At 3/12, E 02 D 17/20, publ. in BI No. 25, 1981), which includes at Diego on the entire slope of the cloth, the folds of which is slid into the body of the mound after filling each layer and angeraut bars, placed at the ends of the folds.

The disadvantages of this process include the following.

Substantial consumption of anchor system. The volume of work associated with the introduction of folds and bars in the body of the mound. Performing this kind of work manually after filling each layer leads to long delays in the process of filling the embankment. In addition, when the layout of the panels on the slope, requiring strengthening, observe the special safety precautions associated with the formation of the landslide.

The technical result of the invention is to improve the degree of mechanization of work, reduction of labor intensity, improve working conditions, reduce material consumption of the circuit elements of the reinforcement and acceleration of the process of filling the embankment.

The result is achieved that in the process of dumping mounds of cloth reinforcing material is formed in a closed loop, covering the slope and having a prismatic shape, with the edges of the panels connect via the elastic element, creating in the upper part of the contour of the tension.

The degree of mechanization of the work increases as a result of use of the special features is ltate not using in the scheme of separate reinforcement elements (bars) and their placement in the ends of the folds. The transition from layer-by-layer scheme reinforcement to reinforcement of multiple layers allows to reduce the consumption of circuit elements of the reinforcement and to speed up the process of filling the embankment by reducing the number of interruptions. While strengthening the slopes of the proposed method, all work is done on horizontal surfaces, and the known method provides for execution of works as on horizontal surfaces and on the surface of the slope. Performing operations on slopes that require strengthening, risk and involves carrying out certain activities on safety. Therefore, a waiver of such operations leads to improved working conditions.

Comparative analysis of the proposed solution with the prototype showed that the proposed method in contrast to the method of construction of the embankment allows to reduce the consumption of circuit elements reinforcing embankments; to reduce the loss of working time and the volume of work; to increase the degree of mechanization and improve working conditions.

The transition from layer-by-layer scheme reinforcement, and an introduction to the scheme of reinforcement of the elastic element due to the following factors.

According to the results of physical modeling of the stress state is held in a state of limiting equilibrium, observed maximum concentration of shear stresses. At the top selection of these slopes is formed a zone of concentration of normal tensile stresses. With the tangential stresses in slopes can be addressed by increasing the friction force. Normal tensile stress can be suppressed with additional compressive forces.

The proposed scheme reinforcement provides for an increase of the friction forces at the bottom of the slope by increasing the length armasamaga site located in the lower part of the mound, and the transfer on the upper part of a slope additional efforts compression resulting tension reinforcing material when connecting the edges of the cloth through the elastic element.

In Fig.1 shows a diagram of the reinforcement breed in the body of the mound prior to the connection of the ends of the cloth of Fig.2 - after connecting them (the arrows in the diagram shows the force resulting from the tension reinforcing material), and Fig.3 presents reusable device designed to move the reel and laying of reinforcing material.

Schema elements the reinforcement of the breed in the body of the mound (see Fig.1 and 2) are the cloth of reinforcing Ngati synthetic material, with sufficient hardness, high modulus and low elongation. The listed requirements are met polyester and polypropylene materials (Heidelberg canvas, terram, nitinol and D. R.). The cloth can be made from a rolled material or mesh. Reinforcing materials in the form of grids have several advantages compared to rolled materials, due to the higher shear in the system soil - reinforcing material and lower cost. In the manufacture of cloth from the roll of material to its connecting ends securely attach the hinges. In the manufacture of the cloth of mesh ends of its longitudinal tape folded over and secured in the form of loops. Metal cable 2 should have a length sufficient for attachment to the bulldozer, pulling the free end of the cloth on the surface of the mound. The 3 beacons are light, hollow elements of large diameter, are used to determine the position of the cable during dumping rocks on top of the reinforcing material. As web beacons may be used exceeded their operational life of the tire or inflated camera hire. Beacons attached to the cable 2 and is placed on the slope. Ramps 4 pelement of which is shown in Fig.3. The function of the elastic element 5 in the circuit performs a strip of durable material with significant elongation or system formed stiff enough springs.

A device for moving the reel and laying the grid (see Fig.3) is strong enough and heavy metal duct 6 without bottom face, with the bent end of one of the side faces. On the end faces of the boxes there are openings 7. These holes are the ends of the rod 8, which is wound reinforcing material in the form of a bobbin 9. To the top face of the box is welded mounting tabs 10.

The proposed method is that through the loops of one of the ends of the cloth 1 is passed the rod 8, around which the reinforcing material is coiled in a bobbin 9. This operation is preliminary and can be performed in any convenient place. The rod with the coil placed in the duct 6 so that the ends of the rod out of the hole 7. Through the loops of the second end panel 1 skipping rope 2, to which are fixed beacons 3. Then mounting tabs 10 box 6 lift on the horizontal surface of the mound, and set outside the prism of a possible collapse of the folded edge to the slope. For the cable 2 cloth vitalive the edge of the cloth is placed in the immediate vicinity of the edge of the slope, and beacons laid on its surface. Filling armasamaga layer above the reinforcing material start in the zone box 6, after the formation of ramps 4 for the passage of trucks and bulldozers are dumping rocks disturbed structure within the whole site. If armorey layer is formed from several osypaemy layers, the thickness of which exceeds the height of the duct 6, the last pull to the surface for mounting the hinges 10 before pouring the next layer. Pull the box to the surface and at the final stage of formation armasamaga layer, but in this case the box is pulled until each of all bobbin 9. Then the ends of the cloth 1 is connected through the elastic element 5. Is this operation as follows.

Bulldozers by means of the cable 2 and the rod 8 pull the ends of the cloth 1, and the loop connecting the pre-stretched springs or tape. As a result, the upper part of the embankment through the reinforcing material is transferred to the tension force, which, together with the forces of friction compensate for excessive efforts, leading to the collapse of the fragile slope.

Since during operation of the embankment, the cable 2 and 3 beacons lose their functions, they UD is the friction force, arising in the system soil - reinforcing material, occiput additional layer of rocks on top of armasamaga.

The direction of movement of the boxes from layer to layer in the direction of the slope is shaped contour, which increases the frictional forces at the bottom of the slope.

The advantages of the proposed method include the following.

Low consumption elements, reinforcing the breed in the body of the mound. Repeated use of auxiliary elements and accessories for moving the reel and laying of reinforcing material.

Reducing labor costs and loss of working time as a result of abandonment of use in the reinforcement system of the individual elements, and the operations associated with that placement.

To increase the degree of mechanization of works through the use of a special device for moving and stacking grid.

Improving working conditions in the execution of the works only on the horizontal surfaces of the embankment.

Along with the forces of friction additional tension forces to settle excessive force, causing the collapse of the fragile slopes.

Claims

Method of strengthening the slopes of embankments, zakluchalsya cloth reinforcing material to form a closed loop, covering the slope and having a prismatic shape, with the edges of the panels connect via the elastic element, creating in the upper part of the contour of the tension force.

 

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FIELD: building, particularly hydraulic structure reinforcement.

SUBSTANCE: method is performed in two-stages. The first stage involves forming vertical elongated flat ground massifs secured by hardening material. Massifs are created in crest embankment area and in upper area of embankment slope so that massifs are spaced minimal available distance from crest and pass through embankment body, including land-sliding upper embankment slope area. Massifs are anchored in mineral bottom by lower edges thereof and are arranged at least in three rows and there are at least three massifs in each row. Method for massifs forming involves driving double-slotted injectors directly in embankment ground or in wells formed in embankment and having plugged wellhead; orienting injector slots perpendicular to hydraulic pressure head vector direction in embankment area to be reinforced; injecting hardening material under increased pressure across horizons from top to bottom or in reverse direction, wherein injection is initially performed under 5-15 atm pressure and at minimal rate in each second injector of one outermost row beginning from extreme ones; feeding hardening material in previously missed injectors in this row; supplying injectors of another extreme row with hardening material in the same way; feeding hardening material to ejectors of medium rows under 10-20 atm pressure; performing the second reinforcement stage as material hardens to obtain 70% strength. The second reinforcement stage involves forming vertical elongated flat massifs of secured ground anchored in mineral bottom by lower edges thereof and arranged at least in three rows, wherein each one includes at least three massifs. Massifs extend at the angle exceeding embankment slope angle to horizontal line. Massifs are formed with the use of double-slotted injectors in remainder embankment area. Injector slots are directed perpendicular to hydraulic pressure head vector direction in embankment area to be reinforced. Hardening material is ejected in above succession, wherein hardening material pressure is equal to design process pressure enough for direction of feeding hardening material through injector slots and lesser than hardening material injection pressure of the first reinforcement stage.

EFFECT: increased reliability of structure reinforcement; prevention of land-slide on structure slopes.

3 cl, 3 dwg

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