High-fill aeolian sand roadbed structure

Abstract

The utility model discloses a high-fill aeolian sand roadbed structure, and belongs to the field of highway roadbed structures in desert areas. The structure disclosed by the utility model comprises an aeolian sand filling layer and a reinforced soil layer, the bottom and the two sides of the aeolian sand filling layer are coated with the reinforced soil layer; a plurality of reinforced soil layers are arranged in the aeolian sand filling layer; a geogrid is laid on the top of the aeolian sand filling layer, and the reinforcing soil layer is made of MICP reinforcing edge covering soil and an MICP reinforcing connecting layer. On the basis of a traditional aeolian sand roadbed structure, a new MICP reinforcement technology is introduced, meanwhile, a roadbed structure of a traditional reinforcement geotechnique is combined, and compared with a common aeolian sand roadbed structure, the structure is convenient to construct, high in durability and high in roadbed bearing capacity; the geogrid is used for replacing geotextile, construction is easier and more convenient, and cost is saved.

Description

Technical Field

[0001] The utility model belongs to the field of highway subgrade structures in desert areas and relates to a high-fill aeolian sand subgrade structure. Background Art

[0002] At present, there are more and more highways crossing desert areas, and different requirements are also put forward for highways in desert areas. Considering cost issues, local materials must be used. At the same time, a series of engineering problems such as uneven settlement and pavement cracking will occur in aeolian sand subgrades. Traditional construction techniques and protection measures can no longer meet the requirements in some special cases.

[0003] Traditional construction methods are often complex in construction, high in cost, and do not meet the requirements of green environmental protection; therefore, applying new technologies to form new subgrade structures, and reinforcement methods that have the advantages of low cost, convenient and simple construction, good durability, and green environmental protection have become technical hotspots that need to be studied urgently. There are currently few high-fill subgrades in desert areas. Therefore, the emergence of a new high-fill aeolian sand subgrade structure can provide certain reference for future highway construction and even railway construction in desert areas. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-fill aeolian sand subgrade structure for solving the problems of uneven settlement and pavement cracking in subgrades in desert areas.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a high-fill aeolian sand subgrade structure, including an aeolian sand filling layer, wherein the bottom and both sides of the aeolian sand filling layer are coated with a reinforced soil layer; the reinforced soil layer is interspersed in the aeolian sand filling layer; a geogrid is laid on the top of the aeolian sand filling layer.

[0007] Further, the types of the reinforced soil layer are MICP reinforced edge soil and MICP reinforced connection layer.

[0008] Further, the bottom and both sides of the aeolian sand filling layer are coated with MICP reinforced edge soil.

[0009] Further, the longitudinal section of the subgrade structure formed by the MICP reinforced edge soil and the geogrid on the top of the aeolian sand filling layer is trapezoidal.

[0010] Further, the MICP reinforced connection layer is interspersed in the aeolian sand filling layer.

[0011] Further, the MICP reinforced connection layer is perpendicular to the bottom and top of the aeolian sand filling layer.

[0012] Further, the geogrid has a triangular mesh structure.

[0013] Further, the geogrid forms a triangular mesh structure through the interpenetration of a number of ribs.

[0014] Further, the meshes of the triangular mesh structure of the geogrid are filled with geotechnical materials.

[0015] Further, the geotechnical material is aeolian sand or soil material.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a high-fill aeolian sand subgrade structure, in which reinforcement soil layers are arranged at the bottom and both sides of the aeolian sand filling layer, and a geogrid is arranged at the top; on the basis of the traditional aeolian sand subgrade structure, the MICP (Microbially Induced Calcium Carbonate Precipitation technology) reinforcement technology is introduced, and at the same time combined with the subgrade structure of the traditional reinforcement geotechnical technology. Compared with the ordinary aeolian sand subgrade structure, this structure is convenient for construction, has strong durability and high subgrade bearing capacity, and can solve the problems of uneven settlement and pavement cracking existing in the subgrade in desert areas.

[0018] Further, the utility model uses a geogrid instead of a geotextile, which makes the construction more convenient and saves costs.

[0019] Further, the utility model applies the MICP (Microbially Induced Calcium Carbonate Precipitation technology) to reinforce the inside of the aeolian sand filling layer and the side slope soil, which can improve the waterproof ability of the overall subgrade and is green, environmentally friendly and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the high-fill aeolian sand subgrade structure of the utility model;

[0021] Figure 2 is the overall structure schematic diagram of the geogrid of the utility model;

[0022] Figure 3 is the overall structure schematic diagram of the ribs in the geogrid of the utility model.

[0023] Wherein: 1 - MICP reinforced side slope soil; 2 - MICP reinforced connection layer; 3 - geogrid; 4 - aeolian sand filling layer; 5 - rib. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] The present utility model will be further described in detail below in conjunction with the accompanying drawings:

[0027] As Figure 1 shown, the present utility model discloses a high fill aeolian sand subgrade structure, which includes an aeolian sand filling layer 4 and a reinforced soil layer; wherein the reinforced soil layer is provided on both sides and the bottom of the subgrade, and a geogrid 3 is provided on the top of the subgrade; reinforced soil layers are also provided between the layers of the aeolian sand filling layer 4.

[0028] Preferably, the type of the reinforced soil layer is MICP reinforced edge soil 1 or MICP reinforced connection layer 2; MICP reinforced edge soil 1 is coated on the bottom and both sides of the aeolian sand filling layer 4; MICP reinforced connection layer 2 is interspersed in the aeolian sand filling layer 4.

[0029] Preferably, the edge soil is MICP reinforced edge soil 1; MICP reinforced edge soil 1 generates calcium carbonate in the edge soil through microbiochemical action (microbially induced calcium carbonate precipitation technology), fills the pores in the edge soil, makes the structure of the edge soil more dense, and plays a role in waterproofing and anti-cracking.

[0030] Preferably, MICP reinforced connection layer 2 generates calcium carbonate inside the soil mass through microbiochemical action, binds the aeolian sand together, and plays a role in reinforcement and anti-seepage.

[0031] Preferably, the geogrid 3 forms a triangular mesh structure through the interpenetration of a number of ribs 5; geotechnical materials are placed in the meshes of the triangular mesh structure; the geotechnical materials can be ordinary aeolian sand or ordinary soil mass; the geogrid 3 confines the filler particles in each grid hole, making the filler locking more compact, reducing the horizontal displacement of the filler, and better connecting the top of the subgrade and the pavement structure together to form a flexible foundation with a certain stiffness, and better transmitting the action of force.

[0032] Embodiment 1

[0033] A high-fill aeolian sand subgrade structure, the inside of the subgrade is an aeolian sand filling layer 4, there is a MICP reinforcement connection layer 2 between each layer, the aeolian sand filling layer is much larger than the MICP connection layer, MICP reinforcement edge-packed soil 1 is provided on both sides and the bottom of the subgrade, a geogrid 3 is provided on the top of the subgrade, and the aeolian sand filler in the geogrid 3 is also reinforced by the MICP technology.

[0034] Aeolian sand filling layer: Aeolian sand is used as the subgrade filler, which has a wide range of material sources, low cost, and little settlement after construction under the condition of ensuring the compaction degree. Using aeolian sand as the subgrade filler can not only control sand disasters but also solve the problem of lack of subgrade filler.

[0035] MICP reinforcement connection layer: By grouting microbial solution into each layer of the aeolian sand filling layer 4, calcium carbonate is precipitated inside the aeolian sand filler to fill the internal pores of the filler, connecting each layer together to be more compact and forming a stress-bearing whole.

[0036] Geogrid: The geogrid 3 has a triangular mesh structure, and the nodes and the mesh are integrated as a whole, making the grid plane have a large stiffness and being isotropic, and can act together with the soil; the ribs 5 of the three-way geogrid 3 have a high thickness, and the rectangular shape of the cross-section greatly increases the constraint effect on the granular material and the load diffusion ability.

[0037] The present utility model studies the stress transfer law and subgrade deformation mechanism of the aeolian sand subgrade under cyclic loads, and improves the subgrade bearing capacity and long-term service performance by setting the geogrid 3 on the top of the subgrade and applying the MICP reinforcement technology.

[0038] The above content is only to illustrate the technical idea of the present utility model, and the protection scope of the present utility model cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present utility model falls within the protection scope of the claims of the present utility model.

Claims

1. A high fill aeolian sand roadbed structure, characterized in that: It comprises an aeolian sand filling layer (4), the bottom and both sides of the aeolian sand filling layer (4) are covered with reinforced soil layers; the reinforced soil layers are interspersed in the aeolian sand filling layer (4); and a geogrid (3) is laid on the top of the aeolian sand filling layer (4).

2. A high fill aeolian sand roadbed structure according to claim 1, characterized in that: The types of the reinforced soil layers are MICP reinforced edge soil (1) and MICP reinforced connecting layer (2).

3. A high fill aeolian sand roadbed structure according to claim 2, characterized in that: The bottom and both sides of the aeolian sand filling layer (4) are covered with MICP reinforced edge soil (1).

4. A high fill aeolian sand roadbed structure according to claim 3, characterized in that: The longitudinal section of the roadbed structure formed by the MICP reinforced edge soil (1) and the geogrid (3) on the top of the aeolian sand filling layer (4) is trapezoidal.

5. The high fill aeolian sand roadbed structure according to claim 4, characterized in that: A MICP reinforcement bonding layer (2) is interspersed in the aeolian sand filling layer (4).

6. The high fill aeolian sand roadbed structure according to claim 5, characterized in that: The MICP reinforcement connecting layer (2) is perpendicular to the bottom and top of the aeolian sand filling layer (4).

7. The high fill aeolian sand roadbed structure according to claim 1, characterized in that: The geogrid (3) has a triangular mesh structure.

8. The high fill aeolian sand roadbed structure according to claim 7, characterized in that: The geogrid (3) is formed into a triangular mesh structure by a plurality of ribs (5) interlaced with each other.

9. The high fill aeolian sand roadbed structure according to claim 7, characterized in that: The mesh holes of the triangular mesh structure of the geogrid (3) are filled with geotechnical materials.

10. The high fill aeolian sand roadbed structure according to claim 9, characterized in that: The geotechnical material is aeolian sand or soil.

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