Aeolian sand roadbed structure

Abstract

The utility model discloses an aeolian sand roadbed structure, and belongs to the field of aeolian sand roadbed structures. According to the aeolian sand roadbed structure disclosed by the utility model, the periphery of the sand core is coated with the reinforced structure formed by the aeolian sand which is reinforced by mixing microorganisms, and meanwhile, the reinforced section with the parallelogram-shaped section is formed, so that sand grains of a vehicle load core supporting body are prevented from being lost, and the lateral confinement effect is enhanced; and the formed parallelogram section jointly improves the mechanical property of the whole structure of the embankment and optimizes the reinforcing strength. The mechanical property of the whole structure of the embankment can be improved, and the method has the advantages of convenience in material taking, simplicity in construction, greenness, economy and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to aeolian sand roadbed structure field relates to an aeolian sand roadbed structure especially based on aeolian sand roadbed structure of microorganism reinforcement technique. BACKGROUND

[0002] Due to the harsh climate conditions, serious regional desertification, frequent geological disasters and fragile ecological environment in the northwest arid desert area, the construction conditions of the highway project are very complex, and the direct economic loss caused by highway diseases reaches hundreds of millions of yuan every year. When building highways in the desert area, a large amount of high fill embankment is usually needed due to the influence of special geological and climatic factors. The traditional aeolian sand embankment is prone to phenomena such as lane collapse and slope deformation instability under the action of long-term traffic load, thereby affecting the travel of vehicles and even threatening the safety of driving.

[0003] There is a serious lack of road construction materials in the desert area, and cement stabilized gravel is often used for pavement of the desert highway base. The engineering construction will produce a large amount of carbon emissions, and the environmental and social problems caused by carbon emissions not only exist in the engineering design and construction stage, but also spread to the long operation stage. If the carbon emission problem cannot be properly handled, it will cause great damage to the natural environment of the environmentally sensitive area, thereby causing some social problems. Moreover, due to the complex geological conditions along the way, the transportation difficulty of the graded gravel for external transportation is increased, so the construction cost of the desert highway has been high. The aeolian sand resource is abundant in the desert area, but due to the poor engineering properties of aeolian sand, it is not suitable for direct use as a filling material for roadbed base and edge soil. Therefore, how to adapt to the local conditions, use local materials, seek benefits and avoid harm, and use the abundant aeolian sand in the desert as a special roadbed filler, which can also economically and high-quality meet the construction requirements, first needs to improve the aeolian sand to a certain extent.

[0004] The traditional aeolian sand treatment method has defects such as high cost, complex operation, long construction period and great influence on the environment. The method of microbially induced calcium carbonate precipitation (MICP) as a new soil improvement method in the field of biological rock and soil in recent years has the characteristics of green and sustainable, good treatment effect, simple construction technology and wide application range compared with the existing soil improvement methods. The technology uses the calcium carbonate precipitation generated by the metabolic process of microorganisms to combine the soil particles together, thereby improving the strength and stiffness of the soil. At present, the research on microorganism improved soil mainly focuses on the dripping and soaking schemes, but the above two schemes have the problem of uneven reinforcement, which seriously limits the large-scale application of microorganism reinforcement technology in the field of rock and soil. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an aeolian sand roadbed structure for solving the technical problems of low resource utilization rate in the existing aeolian sand roadbed construction.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme to realize:

[0007] The utility model discloses a kind of aeolian sand subgrade structures, including foundation, the surface of the foundation is sequentially provided with sand core, top seal layer and pavement structure from below to above;The both sides of the sand core are coated with reinforcing structure;

[0008] The sand core and the reinforcing structure coated on the both sides of sand core form isosceles trapezium cross section.

[0009] Further, the reinforcing structure is composed of microbial solidification liquid and aeolian sand.

[0010] Further, the pavement structure includes surface layer and base layer;The base layer is located on the surface of top seal layer, and the surface layer is located on the surface of base layer.

[0011] Further, the base layer is the reinforcing structure of aeolian sand reinforced by microbial solidification liquid.

[0012] Further, the thickness of the base layer is 100mm-120mm.

[0013] Further, the length of each side of the base layer is 0.25m-0.5m wider than the length of each side of the surface layer.

[0014] Further, the surface layer is composed of double-layer treatment structure made of continuous graded asphalt mixture.

[0015] Further, the thickness of the surface layer is 20mm-25mm.

[0016] Further, the slope ratio between the reinforcing structure coated on the both sides of sand core and foundation is 1:3.

[0017] Further, the thickness of the top seal layer is 30cm-35cm.

[0018] Compared with prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses a kind of aeolian sand subgrade structures, fully utilizes the local rich aeolian sand resources, effectively solves the problem of low resource utilization rate of current aeolian sand area embankment.

[0020] Further, by coating reinforcing structure around sand core, simultaneously forming reinforcing section with isosceles trapezium cross section, prevent sand loss of vehicle load core bearing body, enhance lateral restraint effect, form parallelogram section to improve overall structural mechanical properties of embankment, optimize reinforcing strength.

[0021] Further, the wind deposited sand formed by mixing and reinforcing the microbial solidification liquid of the reinforcing structure can improve the overall structural mechanical properties of the embankment, and has the advantages of convenient material selection, simple construction, green economy and the like.

[0022] Further, to protect the edge of the road surface, the base layer is wider than the surface layer by about 0.25-0.5m on each side. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the wind deposited sand embankment structure of the present application;

[0024] Wherein: 1 - surface layer; 2 - base layer; 3 - top seal layer; 4 - reinforcing structure; 5 - sand core; 6 - foundation. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] The present application discloses a kind of wind deposited sand embankment structure, from bottom to top including foundation 6, sand core 5, top seal layer 3 and road surface structure sequentially arranged;Wherein, the side of sand core 5 is covered with reinforcing structure 4, and the side surface formed is parallelogram;Wherein, reinforcing structure 4 main function is to wrap sand core 5, prevent wind deposited sand sand particle peeling, appearance is set as parallelogram, thickness is set as 1m, the slope ratio of side slope is set as 1:3. Edge covering soil is reinforced after using microbial solidification liquid wind deposited sand paving.

[0028] As Figure 1As shown, the side edge covered reinforcing structure 4 of the sand core 5 is used as the edge soil; the pavement structure is composed of the surface layer 1 and the base layer 2; the base layer 2 is located on the surface of the top sealing layer 3, and the surface layer 1 is located on the surface of the base layer 2, and the base layer 2 is composed of the reinforcing structure 4;

[0029] Preferably, the foundation 6 is the main body of the embankment pavement structure system and the driving load, and in order to ensure that the foundation has sufficient strength and stability, proper foundation treatment measures should be taken to complete most of the consolidation settlement deformation in advance during the construction period, so as to ensure that the post-construction settlement deformation meets the specification requirements.

[0030] Preferably, the sand core 5 is the core component of the embankment and is the core bearing body of the pavement structure and the vehicle load, and is located in the middle part of the embankment and is filled with full wind deposition sand.

[0031] Preferably, the top sealing layer 3 is laid on the top of the sand core and the edge soil, and can be filled with lime soil or lime-soil soil, and the thickness is set to 30-35 cm.

[0032] Preferably, in order to protect the edge of the pavement, the base layer 2 is wider than the surface layer 1 by about 0.25-0.5 m on each side, and the surface layer 1 uses continuous graded asphalt mixture, double layer treatment, and the thickness is set to 20-25 mm.

[0033] Preferably, the preparation process of the reinforcing structure 4 is as follows: after selecting the formula, the amount of microbial curing liquid is calculated, the bacterial liquid and cementing liquid are added to the wind deposition sand in sequence, and after fully mixing and uniformity, the base layer and the edge soil are layered and paved and rolled until the specified compaction degree is reached.

[0034] Preferably, the microbial curing liquid is composed of the bacterial liquid of Bacillus pasteurii and the cementing liquid, the used strain is Bacillus pasteurii, the strain number is ATCC11859, and the bacterial activity is OD600=1.6±0.2. The cementing liquid is a mixed solution of equimolar concentration of urea and calcium chloride, and the concentration is 2 mol / L. The ratio of the bacterial liquid to the cementing liquid is 1:3, and the amount of the curing liquid is determined according to the optimal water content of the wind deposition sand.

[0035] Example 1

[0036] The microbial reinforced wind deposition sand embankment structure comprises, from top to bottom, a surface layer 1, a base layer 2, a top sealing layer 3, edge soil, a sand core 5 and a foundation 6;

[0037] Preferably, the surface layer 1 is paved by asphalt mixture, double layer treatment, and the thickness is set to 20 mm.

[0038] The base layer 2 is filled with aeolian sand fillers reinforced by microbial solidification liquid, the strain number is ATCC11859, the bacterial activity is OD600=1.6±0.2. The cementing liquid is a mixed solution of urea and calcium chloride with equal molar concentration, the concentration is 2mol / L, the ratio of the bacterial liquid and the cementing liquid is 1:3, and the thickness is 100mm;

[0039] The base layer 2 should be about 0.25m wider than the surface layer 1 on each side;

[0040] The top sealing layer 3 is filled with lime soil or lime-soil, and the thickness is 35cm;

[0041] The edge soil is filled with aeolian sand fillers reinforced by microbial solidification liquid, the strain number is ATCC11859, the bacterial activity is OD600=1.6±0.2. The cementing liquid is a mixed solution of urea and calcium chloride with equal molar concentration, the concentration is 2mol / L, the ratio of the bacterial liquid and the cementing liquid is 1:3, and the thickness is 1m;

[0042] The sand core 5 is filled with pure aeolian sand and rolled to a specified degree of compaction;

[0043] The foundation 6 is original aeolian sand, which needs to be rolled to a specified degree of compaction.

[0044] Example 2

[0045] The microbial reinforced aeolian sand subgrade structure comprises, from top to bottom, a surface layer 1, a base layer 2, a top sealing layer 3, edge soil, a sand core 5 and a foundation 6;

[0046] The surface layer 1 is paved with asphalt mixture, double-layer treatment, and the thickness is set to 25mm;

[0047] The base layer 2 is filled with aeolian sand fillers reinforced by microbial solidification liquid, the strain number is ATCC11859, the bacterial activity is OD600=1.6±0.2. The cementing liquid is a mixed solution of urea and calcium chloride with equal molar concentration, the concentration is 2mol / L, the ratio of the bacterial liquid and the cementing liquid is 1:3, and the thickness is 120mm;

[0048] The base layer 2 should be about 0.5m wider than the surface layer 1 on each side;

[0049] The edge soil is filled with aeolian sand fillers reinforced by microbial solidification liquid, the strain number is ATCC11859, the bacterial activity is OD600=1.6±0.2. The cementing liquid is a mixed solution of urea and calcium chloride with equal molar concentration, the concentration is 2mol / L, the ratio of the bacterial liquid and the cementing liquid is 1:3, and the thickness is 1m;

[0050] The thickness of the top sealing layer 3 is 30cm;

[0051] The sand core 5 is filled with pure aeolian sand and rolled to a specified degree of compaction;

[0052] The foundation 6 is the original aeolian sand, which needs to be rolled to the specified compactness.

[0053] The above merely illustrates the technical thought of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical scheme according to the technical thought of the present application falls within the protection scope of the present application.

Claims

1. A wind-blown sand roadbed structure, characterized in that, It includes a foundation (6), on the surface of which a sand core (5), a top sealing layer (3) and a road surface structure are arranged sequentially from bottom to top; the two sides of the sand core (5) are covered with a reinforcement structure (4); The cross-section formed by the sand core (5) and the reinforcing structure (4) covering both sides of the sand core (5) is an isosceles trapezoid.

2. The aeolian sand roadbed structure according to claim 1, characterized in that, The reinforcement structure (4) is a microbial-reinforced aeolian sand reinforcement structure.

3. The aeolian sand roadbed structure according to claim 1, characterized in that, The road structure includes a surface layer (1) and a base layer (2); the base layer (2) is located on the surface of the top sealing layer (3), and the surface layer (1) is located on the surface of the base layer (2).

4. The aeolian sand roadbed structure according to claim 3, characterized in that, The base layer (2) is a microbial-reinforced aeolian sand reinforcement structure.

5. The aeolian sand roadbed structure according to claim 3, characterized in that, The thickness of the base layer (2) is 100mm to 120mm.

6. The aeolian sand roadbed structure according to claim 3, characterized in that, The side length of each side of the base layer (2) is 0.25m-0.5m wider than the side length of each side of the surface layer (1).

7. The aeolian sand roadbed structure according to claim 3, characterized in that, The surface layer (1) consists of a two-layer treatment structure made of continuously graded asphalt mixture.

8. The aeolian sand roadbed structure according to claim 3, characterized in that, The thickness of the surface layer (1) is 20mm-25mm.

9. The aeolian sand roadbed structure according to claim 1, characterized in that, The slope between the reinforced structure (4) covering both sides of the sand core (5) and the foundation (6) is 1:

3.

10. The aeolian sand roadbed structure according to claim 1, characterized in that, The thickness of the top sealing layer (3) is 30cm-35cm.

Images