Anti-slide pile, slope reinforcement device and slope reinforcement method

Abstract

The present invention discloses an anti-slide pile, a slope reinforcement device and a slope reinforcement method. The anti-slide pile includes: a loading section located between the sliding surface and the slope surface; an embedded section located below the sliding surface; an enlarged section provided between the loading section and the embedded section and located below the sliding surface; wherein, the cross-sectional area of the enlarged section is larger than the cross-sectional area of the loading section and the cross-sectional area of the embedded section. Thus, by providing the enlarged section, on the one hand, the acting area of the top of the embedded section on the sliding bed can be increased, effectively reducing the formation resistance within the local range at the top of the embedded section, making it easier to meet the requirements of the foundation horizontal bearing capacity at this place. On the other hand, it helps to reduce the depth of the embedded section, shorten the pile length, which is more economical and reasonable, and the construction operation is simple. It can be seen that the structure of the anti-slide pile of the present invention is simple and ingenious in conception, which is beneficial to improving the overall stability of the slope body.

Description

Technical Field

[0001] The present invention relates to the technical field of landslide control or slope reinforcement, in particular to the technical field of anti-slide piles. Specifically, it relates to anti-slide piles, slope reinforcement devices, and slope reinforcement methods. Background Art

[0002] An anti-slide pile is a beam-like member that penetrates through the landslide body and is deeply embedded in the sliding bed. The landslide thrust borne by the upper part is transmitted to the soil or rock mass of the sliding bed below the pile through the pile body. By relying on the lateral resistance of the pile body embedded in the sliding bed rock and soil mass to balance the landslide thrust of the loaded section of the pile body, the effect of stabilizing the slope is achieved. The main advantages of anti-slide piles are: strong anti-slide ability, clear force action; flexible pile positions, which can be set at the most anti-slide favorable positions in the landslide body; reasonable arrangement of steel bars along the pile length according to the bending moment distribution; convenient construction, simple equipment; interval excavation of pile holes, which is conducive to emergency projects; and the design can be checked and optimized by verifying the formation resistance conditions.

[0003] A single-row anti-slide pile is the basic structural type of anti-slide piles and is also the most commonly used anti-slide pile structure in engineering practice. However, for ordinary single-row piles, the area near the top surface of the sliding bed (i.e., the top of the part of the pile body below the sliding surface) is often loosened or damaged due to the construction vibration of the pile body, and the formation near the top of the part of the pile body below the sliding surface often bears a large lateral extrusion thrust of the pile body. Therefore, it is easy to cause the horizontal bearing capacity of this part of the formation to be difficult to resist the extrusion thrust of the pile body. In order to meet the requirements of formation resistance limitation, it is often necessary to increase the depth of the part of the pile body below the sliding surface to appropriately reduce the extrusion thrust of the top of the part of the pile body below the sliding surface on the formation. In this case, the pile length increases, resulting in a significant increase in the project cost. Summary of the Invention

[0004] The main object of the present invention is to provide an anti-slide pile, a slope reinforcement device, and a slope reinforcement method to solve the technical problem in the prior art that the project cost is significantly increased due to the increase in the pile length of the anti-slide pile.

[0005] To achieve the above object, the present invention first provides an anti-slide pile.

[0006] The anti-slide pile includes:

[0007] A loaded section, which is located between the sliding surface and the slope surface;

[0008] An embedded section, which is located below the sliding surface;

[0009] An enlarged section, which is provided between the loaded section and the embedded section and is located below the sliding surface;

[0010] Wherein, the cross-sectional area of the enlarged section is larger than the cross-sectional area of the loaded section and the cross-sectional area of the embedded section.

[0011] Thus, by setting the enlarged section, on the one hand, the acting area of the top of the embedded section on the slide bed can be increased, effectively reducing the formation resistance within the local range at the top of the embedded section, making it easier to meet the requirements of the foundation horizontal bearing capacity at this location. On the other hand, it helps to reduce the depth of the embedded section, shorten the pile length, which is more economical and reasonable, and the construction operation is simple. It can be seen that the anti-slide pile of the present invention has a simple structure and ingenious concept, which is beneficial to improving the overall stability of the slope, and significantly improves the ability of the pile body in the area with poor slide bed properties to bear the landslide thrust. And when adopting this kind of anti-slide pile structure, since the extrusion force of the pile body on the slide bed is relatively reduced, the requirements for the engineering mechanical properties of the slide bed formation can be appropriately relaxed, expanding the application range of the anti-slide pile structure with significant advantages.

[0012] Furthermore, the cross-sectional dimensions of the loaded section and the embedded section are equal and their projections coincide; the upper end of the enlarged section is flush with the sliding surface. Thus, it is convenient for construction, and the function of the enlarged section can be fully exerted.

[0013] Furthermore, the cross-section of the anti-slide pile is rectangular. In the direction perpendicular to the horizontal projection of the landslide thrust, the width of the enlarged section is 1.5 to 3 times the width of the embedded section. It has been verified that for the anti-slide pile dimensions within the above numerical range, the project cost is reasonable, and the formation resistance within the local range at the top of the embedded section can be reduced to a great extent.

[0014] Furthermore, in the direction of the horizontal projection of the landslide thrust, the width of the enlarged section is equal to the width of the embedded section. In the direction of the horizontal projection of the landslide thrust, the extension of the width of the enlarged section has a relatively small effect on reducing the formation resistance. Therefore, making the width of the enlarged section in this direction equal to the width of the embedded section can further reduce the project cost.

[0015] Furthermore, the cross-section of the anti-slide pile is rectangular, wherein the side perpendicular to the horizontal projection of the landslide thrust of the cross-section of the embedded section is the short side of the embedded section; the cross-sectional dimensions of the embedded section are preferably 1.5 m × 2 m, 2 m × 2.5 m or 2 m × 3 m. The rectangular anti-slide pile has a better reinforcement effect than the square anti-slide pile.

[0016] Furthermore, the cross-section of the anti-slide pile is circular, the cross-sectional diameter of the enlarged section is 1.5 to 3 times the cross-sectional diameter of the embedded section; the cross-sectional diameter of the embedded section is preferably 1 to 2 m. It has been verified that for the anti-slide pile dimensions within the above numerical range, the project cost is reasonable, and the formation resistance within the local range at the top of the embedded section can be reduced to a great extent.

[0017] Further, the length of the embedded section is 0.5 to 0.8 times the length of the loaded section; the length of the enlarged section is 0.1 to 0.4 times the length of the loaded section. When the length of the enlarged section exceeds the above numerical range, the cost increases significantly, but the reinforcement effect tends to be stable. When the length of the enlarged section is lower than the above numerical range, the reinforcement effect is difficult to meet the requirements; it has been verified that when the length of the enlarged section is 0.1 to 0.4 times the length of the loaded section, it can have the advantages of low cost and good reinforcement effect.

[0018] Further, the anti-slide pile is integrally cast from reinforced concrete. Thus, the anti-slide pile is convenient for construction, and the anti-slide pile itself has high strength and long service life.

[0019] In order to achieve the above object, the present invention secondly provides a slope reinforcement device.

[0020] The slope reinforcement device includes pile bodies arranged at intervals. The pile bodies adopt the above anti-slide piles, and the distance between adjacent anti-slide piles is 2 to 3 times the diameter of the enlarged section or the length of the extended side. Among them, the anti-slide piles are preferably combined and used in the structural form of a single row of anti-slide piles, that is, a row of anti-slide piles is arranged at a certain interval along the slope direction. The extended side is the side of the enlarged section in the direction perpendicular to the horizontal projection of the landslide thrust when the cross-section of the anti-slide pile is rectangular. The distance between adjacent anti-slide piles refers to the distance between the vertical axes of adjacent anti-slide piles.

[0021] In order to achieve the above object, the present invention also provides a slope reinforcement method.

[0022] The slope reinforcement method uses the above slope reinforcement device to reinforce a slope with a designed landslide thrust of 700 to 1000 kN / m.

[0023] In summary, the anti-slide pile and the slope reinforcement device of the present invention have the advantages of simple structure, low project cost, good reinforcement effect, etc., can effectively reinforce a slope with a designed landslide thrust of 700 to 1000 kN / m, and can economically and reasonably solve the adverse problems of traditional single-row anti-slide piles.

[0024] The following further describes the present invention in conjunction with the drawings and specific embodiments. The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to assist in understanding the present invention. The content provided in the drawings and the related description in the present invention can be used to explain the present invention, but do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 It is a side view of the anti-slide pile of Embodiment 1 of the present invention.

[0027] Figure 2 This is a cross-sectional view of the anti-slide pile of Embodiment 1 of the present invention.

[0028] Figure 3 This is a distribution curve showing the change of the lateral soil resistance value of the pile with the depth from the bottom surface of the loaded section in Embodiment 1 of the present invention.

[0029] Figure 4 This is a cross-sectional view of the anti-slide pile of Embodiment 2 of the present invention.

[0030] Figure 5 This is a schematic structural diagram of the slope reinforcement device of Embodiment 3 of the present invention.

[0031] The relevant markings in the above-mentioned drawings are as follows:

[0032] 100 - Loaded section;

[0033] 200 - Embedded section;

[0034] 300 - Enlarged section;

[0035] 400 - Slope surface;

[0036] 500 - Slip surface;

[0037] a - Width of the enlarged section in the direction perpendicular to the horizontal projection of the landslide thrust;

[0038] a0 - Width of the embedded section in the direction perpendicular to the horizontal projection of the landslide thrust. Detailed implementation manners

[0039] The present invention will be described clearly and completely below with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that:

[0040] The technical solutions and technical features provided in each part including the following description in the present invention can be combined with each other without conflict.

[0041] In addition, the embodiments of the present invention involved in the following description are usually only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Regarding the terms and units in the present invention. The terms "comprising", "having" and any variations thereof in the specification, claims and relevant parts of the present invention are intended to cover non-exclusive inclusion.

[0043] Example 1

[0044] Figure 1 It is the side view of the anti-slide pile of this embodiment. Figure 2 It is the sectional view of the anti-slide pile of this embodiment (along Figure 1 the A-A direction in

[0045] Figure 1-2 The shown anti-slide pile includes a loading section 100, an embedded section 200 and an enlarged section 300. Among them, the loading section 100 is located between the sliding surface 500 and the slope surface 400, the embedded section 200 is located below the sliding surface 500, and the enlarged section 300 is arranged between the loading section 100 and the embedded section 200 and is located below the sliding surface 500; the anti-slide pile is integrally cast by reinforced concrete.

[0046] The total length of the anti-slide pile is 18 m. Among them, the length of the loading section 100 is 9 m, the length of the embedded section 200 is 6.3 m, and the length of the enlarged section 300 is 2.7 m.

[0047] The cross-sectional dimensions of the loading section 100 and the embedded section 200 are equal and their projections coincide. The cross-sectional dimensions of the loading section 100 and the embedded section 200 are 2 m×3 m; the upper end of the enlarged section 300 is flush with the sliding surface 500.

[0048] The cross-section of the anti-slide pile is rectangular. The side perpendicular to the horizontal projection of the landslide thrust of the cross-section of the embedded section 200 is the short side of the embedded section 200; in the direction perpendicular to the horizontal projection of the landslide thrust, the width a of the enlarged section 300 is 1.5 - 3 times the width a0 of the embedded section 200, that is, a / a0 = 1.5 - 3; in the direction along the horizontal projection of the landslide thrust, the width of the enlarged section 300 is equal to the width of the embedded section 200.

[0049] In order to fully illustrate the beneficial effects brought by adding the enlarged section 300 to the anti-slide pile, the pile side formation resistance values at different depths below the bottom surface of the loading section 100 of the anti-slide pile (that is, the distance from the top of the anti-slide pile is 9 - 18 m) corresponding to different values of a / a0 (respectively taking values of 1, 1.5, 2, 2.5, 3) are further calculated by using the "elastic foundation beam theory". The parameters used in the calculation are as follows: above the sliding surface 500 is gravelly soil, γ1 = 19 kN / m 3 , c1 = 10 kPa, below the sliding surface 500 is moderately weathered mudstone, the designed landslide thrust E n = 900 kN / m, and the horizontal foundation coefficient of the sliding bed is 1×10 5 kN / m 3 .

[0050] Figure 3It is the distribution curve of the pile side formation resistance values at different depths below the bottom surface of the load-bearing section 100 of the anti-slide pile with different a / a0 values. From Figure 3 It can be seen that as a / a0 increases, the pile side formation resistance value gradually decreases, and the spacing between adjacent curves decreases, indicating that the decreasing amplitude of the maximum pile side formation resistance slows down, and the distribution of the pile side formation resistance tends to be relatively uniform.

[0051] Thus, it can be explained that the enlarged section 300 can increase the acting area of the top of the embedded section 200 on the sliding bed, and effectively reduce the formation resistance within the local range at the top of the embedded section 200. At the same time, it helps to reduce the depth of the embedded section 200, shorten the pile length, and is more economical and reasonable.

[0052] As a / a0 increases, the cost will also increase accordingly. Therefore, a / a0 is preferably 1.5 - 3.

[0053] Embodiment 2

[0054] Figure 4 It is the cross-sectional view of the anti-slide pile of this embodiment (along the Figure 1 A - A direction in the figure).

[0055] Compared with Embodiment 1, the difference of the anti-slide pile of this embodiment is that as Figure 4 shown, the cross-section of the anti-slide pile is circular, and the cross-sectional diameter of the enlarged section 300 is 1.5 - 3 times that of the cross-sectional diameter of the embedded section 200; the cross-sectional diameter of the embedded section 200 is 1 - 2 m.

[0056] Embodiment 3

[0057] As Figure 5 shown, the slope reinforcement device is a single row of anti-slide piles obtained by arranging the anti-slide piles of Embodiment 1 at intervals of 2 - 3 times the length of the extended side.

[0058] Embodiment 4

[0059] The slope reinforcement device is a single row of anti-slide piles obtained by arranging the anti-slide piles of Embodiment 2 at intervals of 2 - 3 times the diameter of the enlarged section 300.

[0060] The slope devices of Embodiments 3 - 4 are used to reinforce slopes with a designed landslide thrust of 700 - 1000 kN / m.

[0061] The above has described the relevant content of the present invention. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Based on the above content of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. Anti-slide pile, characterized in that: Comprising A loaded section (100) located between a sliding surface (500) and a slope surface (400); An embedded section (200) located below the sliding surface (500); the length of the embedded section (200) is 0.5 - 0.8 times the length of the loaded section (100); the cross-sectional dimensions of the loaded section (100) and the embedded section (200) are equal and their projections coincide; An enlarged section (300) provided between the loaded section (100) and the embedded section (200) and located below the sliding surface (500); the upper end of the enlarged section (300) is flush with the sliding surface (500); the length of the enlarged section (300) is 0.1 - 0.4 times the length of the loaded section (100); Wherein, the cross-sectional area of the enlarged section (300) is larger than the cross-sectional area of the loaded section (100) and the cross-sectional area of the embedded section (200); The cross-section of the anti-slide pile is rectangular. In the direction perpendicular to the horizontal projection of the landslide thrust, the width of the enlarged section (300) is 1.5 - 3 times the width of the embedded section (200); in the direction along the horizontal projection of the landslide thrust, the width of the enlarged section (300) is equal to the width of the embedded section (200); Alternatively, the cross-section of the anti-slide pile is circular, and the cross-sectional diameter of the enlarged section (300) is 1.5 - 3 times the cross-sectional diameter of the embedded section (200); the cross-sectional diameter of the embedded section (200) is 1 - 2m.

2. The anti-slide pile according to claim 1, wherein: When the cross-section of the anti-slide pile is rectangular, the cross-section of the anti-slide pile is rectangular. Among them, the side perpendicular to the horizontal projection of the landslide thrust of the cross-section of the embedded section (200) is the short side of the embedded section (200); the cross-sectional dimensions of the embedded section (200) are preferably 1.5m×2m, 2m×2.5m or 2m×3m.

3. The anti-slide pile according to claim 1, characterized in that: The anti-slide pile is integrally cast from reinforced concrete.

4. Slope reinforcement device, characterized in that: Comprising pile bodies arranged at intervals, the pile bodies adopt the anti-slide pile described in any one of claims 1 - 3, and the spacing between adjacent anti-slide piles is 2 - 3 times the diameter or the length of the extended side of the enlarged section (300), and the extended side is the side of the enlarged section in the direction perpendicular to the horizontal projection of the landslide thrust when the cross-section of the anti-slide pile is rectangular.

5. Slope reinforcement method, characterized in that: Using the slope reinforcement device described in claim 4 to reinforce a slope with a designed landslide thrust of 700 - 1000kN / m.

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