Shear wall composite reinforced soil retaining wall and construction method thereof

Abstract

The invention relates to a shear wall composite reinforced soil retaining wall and a construction method thereof. An existing retaining wall structure has the problems that the manufacturing cost is high, a wall body is prone to displacement, the additional tensile stress of an anchor rod is too large, and the retaining wall structure is limited by geological conditions. The reinforced soil composite shear wall comprises an underground diaphragm wall, a middle reinforced soil composite shear wall structure and an upper reinforced soil structure. The wall bottom of the underground diaphragm wall is fixedly embedded in the bed rock; the middle reinforced soil composite shear wall structure comprises a plurality of rows of shear walls, a plurality of precast block panels and a plurality of layers of reinforced filling soil, the shear walls are arranged at the upper end of the underground diaphragm wall, the precast block panels and the reinforced filling soil form drawer-shaped structures between the shear walls, and a positive arch plate and a negative arch plate which are connected with the shear walls respectively are arranged in the reinforced filling soil; the upper reinforced soil structure comprises multiple layers of reinforced filling soil and a surface layer structure arranged on the outer side of the reinforced filling soil. The method is low in manufacturing cost, wall displacement and anchor rod additional tensile stress can be reduced, and dependence on site geological conditions is not large.

Description

Technical Field

[0001] The invention relates to the technical field of retaining walls, in particular to a shear wall composite reinforced earth retaining wall and a construction method thereof. Background Art

[0002] At present, the problem of high fill slope support is often encountered in engineering construction in mountainous areas in the fields of civil engineering, civil aviation, energy, etc. When the slope height is greater than 15.0m and the space occupied by the retaining structure itself is limited, the available support forms are relatively simple, and reinforced earth retaining walls or pile-sheet retaining walls can be selected.

[0003] When a reinforced earth retaining wall is selected, the essence of the reinforced earth retaining wall is to rely on its own gravity to resist the rock and soil pressure behind the wall. According to conventional engineering practices, when the filling material is crushed stone soil, sand and other good fillers, the overall slope limit of the retaining wall itself can reach 1:0.5 while meeting its own stability. The height limit can reach 50m. However, the width of the reinforced earth retaining wall reinforcement is large and the cost is high. The synthetic reinforcement may creep under long-term load, causing the wall to slowly move. In addition, the reinforced earth retaining wall is subject to environmental restrictions and is not suitable for soft foundations. When the bearing capacity of the foundation is too low, additional treatment is required (such as foundation treatment piles at the base or anti-slip piles in front of the retaining wall).

[0004] When pile-sheet walls are selected, there are no anchor cables on the piles, and the cantilever section support height should not exceed 12.0m. When multiple anchor rods are set on the piles, the vertical support height should not exceed 25.0m. The additional tensile stress of the anchor rods caused by the settlement of the new fill soil is too large, and the scope of application of pile-sheet walls is limited. Pile-sheet walls are suitable for small and medium-sized retaining projects. For large-scale high fill or complex geological conditions, it may be necessary to combine other structures (such as bridges, pile foundation support beam retaining walls) for comparison. In densely populated urban areas or sites with limited space, the construction of pile-sheet walls may affect the safety of surrounding buildings.

[0005] Therefore, there is an urgent need for a retaining wall and a construction method thereof that are low in cost, can reduce wall displacement and additional tensile stress of anchor rods, and are less dependent on site geological conditions. Summary of the Invention

[0006] The purpose of the present invention is to provide a shear wall composite reinforced earth retaining wall and a construction method thereof, so as to at least solve the problems of the current retaining wall structure being high in cost, easy displacement of the wall, excessive additional tensile stress of the anchor rods and being restricted by geological conditions.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] Shear wall composite reinforced soil retaining wall, including underground continuous wall, middle reinforced soil composite shear wall structure and upper reinforced soil structure;

[0009] The bottom of the underground continuous wall is embedded in the bedrock;

[0010] The central reinforced soil composite shear wall structure includes multiple rows of shear walls, multiple prefabricated panel panels and multiple layers of reinforced fill soil. The shear walls are all arranged at the upper end of the underground continuous wall. The prefabricated panel panels and the reinforced fill soil form a drawer-shaped structure between the shear walls. The reinforced fill soil is provided with positive arch plates and reverse arch plates respectively connected to the shear walls.

[0011] The upper reinforced soil structure includes multiple layers of reinforced fill soil and a surface layer structure arranged outside the reinforced fill soil;

[0012] The soil behind the wall on the rear side of the reinforced fill soil is combined with the natural slope in the form of steps.

[0013] Furthermore, a plurality of arch plate supports are provided on the shear wall, and the positive arch plate and the reverse arch plate are both connected to the arch plate supports.

[0014] Furthermore, cement mortar filling blocks are respectively provided on one side of both ends of the positive arch plate and the reverse arch plate away from the arch plate support.

[0015] Furthermore, the positive arch plate is a concrete arch plate concave toward the natural slope, and the positive arch plate, the arch plate support, the cement mortar filling block, the reinforced filling soil, the prefabricated block panel and the shear wall form a positive arch plate support.

[0016] Furthermore, the anti-arch plate is a concrete arch plate protruding outward from the natural slope surface, and the anti-arch plate, the arch plate support, the cement mortar filling block, the reinforced filling soil, the prefabricated block panel and the shear wall form an anti-arch plate support.

[0017] Furthermore, the positive arch plate support is arranged below the reverse arch plate support.

[0018] Furthermore, the prefabricated panel is flush with the outer facade of the shear wall and is consolidated with the geogrid in the reinforced fill soil.

[0019] Furthermore, the positive arch plate and the reverse arch plate are both prefabricated components, and the heights of the positive arch plate and the reverse arch plate are consistent with the height of the prefabricated block panel.

[0020] Furthermore, the upper reinforced soil structure adopts a graded slope form.

[0021] The construction method of shear wall composite reinforced soil retaining wall comprises the following steps:

[0022] Excavating the steps on the natural slope, constructing the underground continuous wall, and exposing the steel bars connecting the main bars;

[0023] Constructing the shear wall and the arch plate support on the shear wall using high formwork;

[0024] The geogrid is laid in layers, the positive arch plate, the reverse arch plate and the prefabricated panel are placed, the geogrid is filled in layers, the surface layer structure is installed, the soil behind the wall is filled, and the soil is rolled and compacted until it reaches the top of the retaining wall.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention provides a shear wall composite reinforced soil retaining wall and a construction method thereof, which combines the shear wall as a high-rigidity horizontal resistance system with the reinforced fill soil with a tensioning effect through a positive arch plate, a reverse arch plate and an arch plate support, to form a new retaining wall with a multi-point anchoring effect as a whole. The back-of-wall soil pressure is resisted by the shear wall and the underground continuous wall consolidated therewith, and the back-of-wall pressure is transmitted to the rock and soil layer, which can significantly reduce the width of the geogrid laying, which is beneficial to saving the project cost; and as a retaining wall with a multi-point anchoring effect, it can significantly reduce the overall horizontal displacement of the retaining wall, and improve the characteristics of the traditional cantilever structure that is easy to overturn and has poor stress resistance; the present invention does not set an anchoring structure, which fundamentally solves the problem of excessive additional tensile stress of the anchor rod caused by the settlement of the new fill soil; and the retaining wall of the present invention is not much dependent on the geological conditions of the site, does not require anchoring conditions, and the filling area is open and clear, which is beneficial to rapid and large-scale filling, and has few restrictions on filling compaction, which is beneficial to high-quality filling.

[0027] 2. The underground continuous wall of the present invention can obtain high anti-sliding stability by being embedded in the bedrock, and the shear wall is completely hidden in the fill to form a vertical facade, which is convenient for landscape arrangement. The shear wall is a rigid component and the reinforced fill soil is a flexible material. When an earthquake load occurs, the "drawer" structure formed by the reinforced fill soil and the prefabricated panels between the shear walls will greatly consume the seismic energy during relative movement, increase damping, and thus reduce the probability of retaining wall damage during an earthquake.

[0028] 3. Except for shear walls and underground continuous walls, all components of the present invention are prefabricated or cost-effective components, which are convenient for production in factories and on-site installation, thereby achieving the purpose of rapid and large-scale construction. The underground continuous wall adopts mechanical drilling instead of the artificial drilling method of anti-slip piles, which helps to improve construction safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0030] Figure 1 It is a schematic cross-sectional view of the present invention;

[0031] Figure 2 yes Figure 1 AA section view in;

[0032] Figure 3 yes Figure 1 BB cross-section in;

[0033] The symbols in the figure are:

[0034] 1-shear wall, 2-underground continuous wall, 3-arch slab support, 4-precast panel, 5-positive arch slab, 6-geogrid, 7-cement mortar filling block, 8-reverse arch slab support, 9-positive arch slab support, 10-reinforced fill soil, 11-surface structure, 12-earth behind the wall, 13-steps, 14-bedrock, 15-natural slope, 16-reverse arch slab. DETAILED DESCRIPTION

[0035] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0036] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] In the description of the present invention, it should be understood that multiple steps are involved in the description of the method, which should not be understood as a limitation on the order of the method steps. Technical solutions obtained by simply changing the order of the steps when solving the same technical problem are also within the scope of protection of the present invention.

[0039] Example 1:

[0040] This embodiment provides a shear wall composite reinforced soil retaining wall, which includes an underground continuous wall 2, a middle reinforced soil composite shear wall structure and an upper reinforced soil structure.

[0041] Specifically, the central reinforced soil composite shear wall structure is consolidated on the underground continuous wall 2. The central reinforced soil composite shear wall structure includes multiple rows of shear walls 1, multiple prefabricated block panels 4 and multiple layers of reinforced fill 10. The shear walls 1 are all arranged at the upper end of the underground continuous wall 2. The prefabricated block panels 4 are distributed between the shear walls 1, and the prefabricated block panels 4 and the reinforced fill 10 form a drawer-shaped structure between the shear walls 1. The reinforced fill 10 is provided with a positive arch plate 5 and a reverse arch plate 16 respectively connected to the shear wall 1. The positive arch plate 5 and the reverse arch plate 16 are completely buried in the reinforced fill 10.

[0042] The multiple rows of shear walls 1 are connected by deep beams to jointly bear the earth pressure, and the geogrid 6 is placed in the reinforced fill soil 10 .

[0043] Arch plate supports 3 are respectively provided on the inner walls of the two shear walls 1 on both sides, and arch plate supports 3 are provided on both side walls of the shear wall 1 between the shear walls 1 on both sides. The centers of the arch plate supports 3 are located on the same horizontal plane, and the positive arch plate 5 and the reverse arch plate 16 are both connected to the arch plate supports 3.

[0044] The horizontal cross-section of the arch plate support 3 is trapezoidal. The arch plate support 3 is a cast-in-place concrete structure and is cast together with the shear wall 1 exposed to the ground. Cement mortar filling blocks 7 are respectively provided on the side away from the arch plate support 3 at both ends of the positive arch plate 5 and the reverse arch plate 16, which are used to fix the positive arch plate 5 and the arch plate support 3 as well as the reverse arch plate 16 and the arch plate support 3.

[0045] Specifically, the positive arch plate 5 is a concrete arch plate concave toward the natural slope 15. The positive arch plate 5, the arch plate support 3, the cement mortar filling block 7, the reinforced fill soil 10, the prefabricated block panel 4 and the shear wall 1 form a positive arch plate support 9. The geogrid 6 in the reinforced fill soil 10 is pressed on the shear wall 1. When the fill soil tends to move outward relative to the shear wall 1, it will be hindered by the positive arch plate 5.

[0046] The anti-arch plate 16 is a concrete arch plate protruding outward from the natural slope 15. The anti-arch plate 16, the arch plate support 3, the cement mortar filling block 7, the reinforced fill soil 10, the prefabricated block panel 4 and the shear wall 1 form an anti-arch plate support 8. The geogrid 6 is pulled on the shear wall 1. When the fill soil tends to move inward relative to the shear wall 1, it will be hindered by the anti-arch plate 16.

[0047] In this embodiment, the positive arch plate support 9 is arranged below the negative arch plate support 8.

[0048] In this embodiment, the positive arch plate 5, the reverse arch plate 16 and the prefabricated panel 4 are all prefabricated components, and the heights of the positive arch plate 5 and the reverse arch plate 16 are consistent with the height of the prefabricated block panel 4. The positive arch plate 5, the reverse arch plate 16 and the prefabricated panel 4 are all placed when the reinforced filling soil 10 is layered. After placement, cement mortar filling blocks 7 are respectively set at the feet of the positive arch plate 5 and the reverse arch plate 16 to prevent the positive arch plate 5 and the reverse arch plate 16 from moving during the filling process.

[0049] The prefabricated panel 4 is flush with the outer facade of the shear wall 1 , and the prefabricated panel 4 is consolidated with the geogrid 6 in the reinforced fill soil 10 .

[0050] The bottom of the underground continuous wall 2 is embedded in the bedrock 14. The underground continuous wall 2 is drilled by a combination of rotary drilling and square hammer punching and slot milling. The underground continuous wall 2 is cast in an integrated manner. The long side direction of the underground continuous wall 2 is the same as the slope direction of the natural slope 15. The spacing of the underground continuous wall 2 is the sum of the width of each geogrid 6 and twice the height of the arch plate support 3.

[0051] In this embodiment, the upper reinforced earth structure is located at the top of the shear wall 1 in the middle, and includes multiple layers of reinforced fill soil 10 and a surface layer structure 11 arranged on the outside of the reinforced fill soil 10. The upper reinforced earth structure adopts a graded slope form, and the surface layer structure 11 adopts a reverse-wrapped crushed stone surface layer or a prefabricated block surface layer.

[0052] In this embodiment, the back-wall earthwork 12 on the rear side of the reinforced fill 10 is combined with the natural slope 15 in the form of steps 13 .

[0053] The support height of this embodiment is within the range of 25m, and the overall slope is vertical. The support height is within the range of 25m to 50m, and the overall slope reaches 1:0.3. When double or multiple rows of shear walls 1 are used, the support height can exceed 50m, which greatly expands the upper limit of the application of high and steep fill slope support structures.

[0054] Example 2:

[0055] This embodiment provides a construction method for a shear wall composite reinforced earth retaining wall, and the steps are as follows:

[0056] First, a step 13 is excavated on the natural slope 15, and an underground continuous wall 2 is constructed, and the steel bars are exposed to connect the main bars;

[0057] Secondly, high formwork is used to construct the shear wall 1 and the arch plate support 3 on the shear wall 1;

[0058] Finally, the geogrid 6 is laid in layers, the positive arch plate 5, the reverse arch plate 16 and the prefabricated panel 4 are placed, the geogrid 6 is filled in layers, the surface structure 11 is installed, the earthwork 12 behind the wall is filled, and it is compacted and filled until it reaches the top of the retaining wall.

[0059] It should be noted that the structural system of the present invention needs to be designed and calculated in accordance with relevant specifications. During the design, the specifications and parameters of the ground-connected walls, shear walls, arch plates, fill soil, and geogrids are adjusted according to the slope height, geological conditions, ground load, etc., in an effort to achieve the safest and most economical purpose.

[0060] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. Shear wall composite reinforced earth retaining wall, characterized by: It includes an underground continuous wall (2), a middle reinforced soil composite shear wall structure and an upper reinforced soil structure; The bottom of the underground continuous wall (2) is embedded in the bedrock (14); The central reinforced soil composite shear wall structure comprises multiple rows of shear walls (1), multiple prefabricated panel boards (4) and multiple layers of reinforced filling soil (10); the shear walls (1) are all arranged at the upper end of the underground continuous wall (2); the prefabricated panel boards (4) and the reinforced filling soil (10) form a drawer-shaped structure between the shear walls (1); and the reinforced filling soil (10) is provided with a positive arch plate (5) and a reverse arch plate (16) respectively connected to the shear walls (1); The upper reinforced soil structure comprises multiple layers of reinforced filling soil (10) and a surface layer structure (11) arranged outside the reinforced filling soil (10); The wall backfill (12) on the rear side of the reinforced filling soil (10) is combined with the natural slope (15) in the form of steps (13).

2. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: A plurality of arch plate supports (3) are provided on the shear wall (1), and the positive arch plate (5) and the reverse arch plate (16) are both connected to the arch plate supports (3).

3. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: Cement mortar filling blocks (7) are respectively provided on the sides of both ends of the positive arch plate (5) and the reverse arch plate (16) away from the arch plate support (3).

4. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: The positive arch plate (5) is a concrete arch plate concave toward the natural slope surface (15); the positive arch plate (5), the arch plate support (3), the cement mortar filling block (7), the reinforced filling soil (10), the prefabricated block panel (4) and the shear wall (1) form a positive arch plate support (9).

5. The shear wall composite reinforced earth retaining wall according to claim 4, characterized in that: The anti-arch plate (16) is a concrete arch plate protruding outward from the natural slope surface (15); the anti-arch plate (16), the arch plate support (3), the cement mortar filling block (7), the reinforced filling soil (10), the prefabricated block panel (4) and the shear wall (1) form an anti-arch plate support (8).

6. The shear wall composite reinforced earth retaining wall according to claim 5, characterized in that: The positive arch plate support (9) is arranged below the negative arch plate support (8).

7. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: The prefabricated panel (4) is flush with the outer facade of the shear wall (1) and is consolidated with the geogrid (6) in the reinforced fill soil (10).

8. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: The positive arch plate (5) and the reverse arch plate (16) are both prefabricated components, and the heights of the positive arch plate (5) and the reverse arch plate (16) are consistent with the height of the prefabricated block panel (4).

9. The shear wall composite reinforced earth retaining wall according to claim 1, characterized in that: The upper reinforced soil structure adopts a graded slope form.

10. The construction method of shear wall composite reinforced earth retaining wall is characterized by: The construction method steps are as follows: Excavating the steps (13) on the natural slope (15), constructing the underground continuous wall (2), and exposing the main reinforcement bars; High formwork is used to construct the shear wall (1) and the arch plate support (3) on the shear wall (1); The geogrid (6) is laid in layers, the positive arch plate (5), the reverse arch plate (16) and the prefabricated panel (4) are placed, the geogrid (6) is filled in layers, the surface layer structure (11) is placed, the earthwork (12) behind the wall is filled, and the earthwork is compacted and filled until it reaches the top of the retaining wall.

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