Landslide design for stabilization of slopes and earthworks

 

The invention relates to the field of construction and can be used for stabilization of landslide-prone slopes in the construction of road, industrial and other engineering structures, reconstruction and strengthening of landslide-prone or susceptible to significant splavam slopes soil structures. Landslide design for stabilization of slopes and earthworks includes a retaining structure executed in the form of a prism stone. What's new is that the retaining structure is located in the grounds of landslide array, and the quality of the stone used carbonate-magnesium rocks with water-absorbing heat-treated magnesium Supplement. The technical result of the invention consists in the development of anti-design, hardening which, during the subsequent operation is ensured due to the receipt in her moisture landslide array. 5 C.p. f-crystals, 2 Il.

The invention relates to the field of construction and can be used for stabilization of landslide-prone slopes in the construction of road, industrial and other engineering structures, reconstruction and strengthening of landslide-prone or susceptible to significant splavam accounting elements and the base, on which it is located. The most difficult to ensure the stability of the structures located on unstable slopes subject to erosion processes: landslides and significant splavam soils and unstable slopes soil structures, in particular, on the railroads, the slope of the subgrade: embankments, dredging. Unexpected splavy and opolzaniya arrays soil with slopes lead to bias in terms of the path, and deformation of slopes lead to a decrease in constructive settlement size and violation of relatively stable equilibrium ground structures. In both cases this is due to the instability of the structures and affect the safe and uninterrupted movement of trains, the operational reliability of engineering structures.

The most adverse soil bases and subgrade pavement structure soils are predominantly clay composing the landslide slopes: bentonite, montmorillonite and so on, which in dry form have sufficient strength, and as a result of excessive moisture moving in a fluid state and become “myleopathy” mass. The surface of the landslide-prone slopes, usually uneven, consists of valleys and hills, called “CIO which occur progress, - mirror or the sliding surface [1].

Known landslide design for stabilization of slopes and earthworks from the bulk soil [2]. Landslide structure is a retaining structure executed in the form of a prism of soil (contract). The retaining structure is placed in the passive zone of the landslide, perpendicular to creeping array, along the railroad. For a better grip retaining structures with creeping slope in the active area, the entire area of contact with him made the ledges. To ensure sufficient strength retaining structures, at least the lower ledge is made in strong soils. The retaining structure has a considerable size, which are determined by calculation. The upper part of the retaining structures is not less than 3 m, the height is not less than 1/3 of the height of the supporting slope. Retaining the structure of one side face covered to the slope, the other face (the slope) is made at an angle, slope not less than 1:1,5. As the primer used, for example, draining the rocky ground.

By virtue of the known landslide designs is that the stability of slopes and slopes dost is the first design due to its large mass.

The disadvantage is the loss of strength retaining structures over time. This is due to the following reasons. After filling of the retaining structure, the moisture with minute particles of clay in suspension from the active zone of the landslide vysajivaetsya through draining soil retaining structures. Gradually small soil particles clog the pores between the larger particles draining soil retaining structures, transforming him into a monolith. Accumulated water before construction creates additional shear force. This negatively affects the durability of the retaining structures and leads to its deformation and, accordingly, the deformation of the protected object.

Closest to the technical essence and the achieved result is a landslide design for stabilization of slopes and earthworks, which is a retaining structure in the form of a prism (buttress), made of stone [2]. The retaining structure is placed in the passive zone of the landslide perpendicular to creeping array along the railroad. To ensure the sustainability and durability of the retaining structure embedded in a solid dry soils. To save grunderzeit landslide array can be calculated. Supporting structure made of small size: up to 3 m long and 1 m wide. A retaining structure in the form of monolith from masonry rubble stone on cement or concrete.

Dignity is the strength of such retaining structures. This is because the monolithic strengthens the design and, therefore, increases the holding capacity of the structures. The increase in strength due to the monolithic allows to reduce the dimensions of the retaining wall.

In addition, retaining structures minimally disturb the natural composition of samples due to its small size and compactness.

However, the strength of the retaining structure, high for working in dry soils, is not sufficient to work in the wet (liquid and plastic) soils, which is a significant disadvantage of retaining structures and limits the scope of application of known construction. This is because in case of moisture from the soil masonry retaining structures getting wet. Wet cementitious part of the design is the rapid leaching water (erosion). Erosion of masonry leads to the violation of the integrity of the structure, deformation, and then the loss of the project prochnosti. Ultimately, it all leads to the destruction of such landslide structures.

The basis of the invention is to develop a landslide design, hardening which, during the subsequent operation is ensured due to the receipt in her moisture landslide array.

To solve the problem in the known landslide structures for stabilization of slopes and earthworks, retaining containing construction made in the form of a prism stone retaining structure is located in the grounds of landslide array, and the quality of the stone used carbonate-magnesium rocks with water-absorbing heat-treated magnesium Supplement. As carbonate-magnesium rocks used macro-grained rock waste crushing Brusilov, and as a water-absorbing heat-treated magnesium supplements used screening and waste a half-baked magnesia rocks. In addition, the supporting structure is located anywhere landslide array.

Hardening of the structure occurs due to the receipt in her moisture.

Due to the presence of large fractions of brucite and water-absorbing heat-treated magnesium Domaine water, coming from a landslide, adsorbed carbonate-magnesium rocks and water-absorbing heat-treated magnesium Supplement, which leads to drying of the slip surface of the landslide. This adsorbed water, gradually reacting with the water-absorbing heat-treated magnesium Supplement causes hydration and carbonation. Formed during the hydration and carbonation of silicates of CA and Mg and has a strengthening effect that reinforce the retaining structure.

In addition, the cations Mg, reacting with the surface on which slide the hard clay soils, form solid crystals of silicates and hydroalumination CA and Mg. The formation of hydroalumination and silicates of CA and Mg leads to additional grip landslide array with reinforced bottoms.

Thanks adsorption properties of carbonate-magnesium rocks and water-absorbing heat-treated magnesium supplements is constantly draining slip surface of the landslide and strengthening of supporting structures.

The constant draining of the landslide can accommodate a retaining structure in the active and passive zone of landslide array at any angle to the direction of opolzaniya from 0 to 90

The drying and hardening of soil slip surface of the landslide causes additional retention efforts. Constant water absorption of carbonate-magnesium rocks and water-absorbing heat-treated magnesium additive leads to hardening of the retaining structures and sealing, and hardening the clay particles of the landslide.

In Fig.1 and 2 presents the scheme of anti-design for stabilization of slopes and earthworks.

Landslide design 1 in the body of landslide array 2 includes a retaining structure 3. The retaining structure 3 is made in the form of a prism made of stone and located below the surface of the slide 4. The quality of the stone used macro-grained rock waste crushing carbonate-magnesium rocks and their heat-treated fine fraction. To macro-grained rock waste crushing carbonate-magnesium rocks include waste crushing Brusilov, dolomite, calciferol, talcomagnesite, i.e. rocks containing more than 30% Mg and which is the sorbents. Heat-treated small fraction plays the role of a water-absorbing magnesium supplements and is located on top of the macro-grained rock fractions of brucite. The retaining structure 3 is made on the cut estudiantina distance from earth structures, but the pressure of the landslide mass affects the deformability of structures indirectly in the form of plastic deformation of the base and surface disturbance and soil runoff or, another case, when the slopes of the earthen structures are exposed to soltanian.

The retaining structure 3 is made of macro-grained rock waste crushing Brusilov water-absorbing and heat-treated magnesium supplements from dropping out and waste a half-baked magnesia rocks and is located at the foot of the mound 6, perpendicular to the sliding on the ledges 5.

Example 2. The body of the landslide is the basis of earth structures, pressure landslide mass directly affects the deformability of structures due to the lack of drainage and drainage systems 7. This case is most suitable for hardening massive landslides by drying.

Retaining structures 3 made of macro-grained rock waste crushing Brusilov water-absorbing and heat-treated magnesium supplements from dropping out and waste a half-baked magnesia rocks and are located along the slope 8 to protect drainage facilities from the strain.

Example 3. The body of the landslide is the basis of earth structures, pressure landslide masses directly is Chodov crushing Brusilov water-absorbing and heat-treated magnesium supplements from dropping out and waste a half-baked magnesia rocks and are located on the landslide array 2 along the array 8 and across the array 9 and performed in conjunction with drainage and drainage systems. Such a case is most applicable for drying and hardening of massive landslides.

Design works as follows.

After the device retaining structures 3 in the body of the landslide 2 on the ledges 5 below the surface of the slide 4 hygroscopic moisture of the landslide begins to absorb macro-grained rock fractions of brucite. Macro-grained rock fraction of brucite are sorbents, transmitting moisture from the surface of opolzaniya in the upper layers. Contact macro-grained rock fractions of brucite with underlying clays formed a solid crystals hydroalumination and hydrosilicates Mg and CA. The formation of hydroalumination and silicates of CA and Mg leads to additional grip landslide array with reinforced soils. Adsorbed in the upper layers of the water absorbed the heat-treated water-absorbing magnesium Supplement 5, which causes her hydration and carbonation. The combination of large fractions of brucite and water-absorbing heat-treated magnesium supplements from dropping out and waste a half-baked magnesia rocks cycles water absorption, which allows you to drain the slip surface of the landslide. Formed during the hydration and carbonation of silicates of Mg and CA have a firming effect the m direction and the location of the retaining structure 3 is selected depending on the maximum retention efforts.

Thus, constant water absorption of carbonate of magnesia rocks and water-absorbing heat-treated magnesium additive leads to hardening of the retaining structures and sealing, and hardening the clay particles of the landslide. Adsorption properties of carbonate-magnesium rocks and water-absorbing heat-treated magnesium supplements allow you to constantly drain the slip surface of the landslide and contribute to the strengthening of the retaining structures.

The retaining structure can withstand the pressure of landslide masses 1.2-1.5 times greater than conventional contract or buttress, by increasing retention efforts entrenched in the monolith, which contributes to longer service life, reliability and stability strengthened engineering structures.

Sources of information

1. M. C. Aeroskin, S. C. Babicka, S. M. Bolshakov and other Reference subgrade operated Railways. /Ed. by A. F. Tan, M. A. Chernyshev, V. P. Titov. - M.: Transport, 1978, S. 452-464.

2. C. D. Braslavsky, J. M. L., L. C. gritsyuk and other Landslide designs on the roads. - M.: Transport, 1985, S. 218-222.

Claims

1. Protivopoltavlenie in the form of a prism stone, wherein the retaining structure is located in the grounds of landslide array, and the quality of the stone used carbonate-magnesium rocks with water-absorbing heat-treated magnesium Supplement.

2. Landslide design for stabilization of slopes and earthworks under item 1, characterized in that the carbonate-magnesium rocks used macro-grained rock waste crushing Brusilov.

3. Landslide design for stabilization of slopes and earthworks under item 1, characterized in that the heat-treated water-absorbing magnesium supplements used component of dropout and burnt waste Stripping magnesian rocks, such as dolomite.

4. Landslide design for stabilization of slopes and earthworks according to any one of paragraphs.1-3, characterized in that the retaining structure is located in the body of landslide array at an angle to the direction of opolzaniya from 0 to 90°.

5. Landslide design for stabilization of slopes and earthworks according to any one of paragraphs.1-4, characterized in that the retaining structure is located in an active landslide area.

6. Landslide design the RNA structure is located in the passive zone of the landslide.

 

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