CN111206559A

CN111206559A - Desert area surface solidification method and structure

Info

Publication number: CN111206559A
Application number: CN202010080422.XA
Authority: CN
Inventors: 谢小松; 肖建华; 姚正毅; 朱海骏; 陈灿; 温换玲; 刘明华; 赵辉; 马歆炜; 叶冬挺; 栗树果; 单艳花; 王玉林; 谷晓阳; 孙银波; 陆武萍; 吴建
Original assignee: Shanghai Electric Group Corp; Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Current assignee: Shanghai Electric Group Corp; Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Priority date: 2020-02-05
Filing date: 2020-02-05
Publication date: 2020-05-29

Abstract

The invention discloses a method and a structure for solidifying the surface of a desert area, and relates to the field of wind and sand control. The method for solidifying the surface of the desert area comprises the following steps: removing the aeolian sand above the hard layer of the area to be solidified; taking out the hard layer of the area to be solidified; taking out rock stratum materials of the area to be solidified; backfilling the aeolian sand to obtain a backfill layer; and laying a covering layer on the surface of the backfill layer. Wherein the overburden is cuttings or dust of the formation material. According to the technical scheme, the sand accumulation on the earth surface of the project area is backfilled, and underground rock stratum substances cover the surface of the earth surface, so that the earth space balance requirement can be met, and the cost is saved.

Description

Desert area surface solidification method and structure

Technical Field

The invention relates to the field of wind-blown sand control, in particular to a method and a structure for solidifying the surface of a desert area.

Background

The desert area is wide, and more engineering development projects are developed in the desert area in recent years. In desert engineering, sand damage is one of the most important disasters. The sand damage directly threatens the engineering construction and the sustainable development. The primary sand control in desert engineering is to realize the solidification of the earth surface in the engineering area.

In the prior art, the methods for solidifying the surface of the desert engineering area comprise the following steps: covering gravel; curing the concrete; paving building stones such as bricks; and curing the chemical curing agent.

Due to the particularity of surface solidification in desert engineering areas, the inventors found that the above methods all have the following defects:

(1) and (4) covering with gravel. The gravel is movable, and can be quickly damaged and lose effect under the action of external force such as driving, so that the flowing sand covered under the gravel is exposed, and sand damage can occur again along with the development of subsequent engineering in a project area.

(2) Curing concrete and paving building stones such as bricks. The implementation cost is huge, the method is suitable for small-area areas, and the requirement of large-area desert projects on economic cost cannot be met.

(3) And curing the chemical curing agent. The method has huge implementation cost, and meanwhile, the method has negative pollution to the environment and cannot meet the requirement standard of project environmental protection.

In addition, the above methods have the following disadvantages: the above methods can not meet the requirements of higher environmental protection on sand damage treatment.

Disclosure of Invention

The invention provides a method and a structure for solidifying the surface of a desert area.

The embodiment of the invention provides a method for solidifying the surface of a desert area, which comprises the following steps:

removing the aeolian sand above the hard layer of the area to be solidified;

taking out the hard layer of the area to be solidified;

taking out rock stratum materials of the area to be solidified;

backfilling the aeolian sand to obtain a backfill layer;

paving a covering layer on the surface of the backfill layer; wherein the overburden is a fragment or cuttings of the formation material.

In some embodiments, the backfilling of the aeolian sand comprises:

and (4) layering and curing the removed aeolian sand from the bottom layer to the top layer.

In some embodiments, the operation of curing each layer of said aeolian sand comprises the following steps:

laying the aeolian sand;

sprinkling water on the top surface of the layer of aeolian sand;

and compacting the wind-blown sand layer to obtain the wind-blown sand layer with the set thickness.

In some embodiments, the thickness is set to be 15cm to 50 cm.

In some embodiments, the thickness is set to be 15cm to 30 cm.

In some embodiments, the step of compacting the layer of aeolian sand comprises:

and rolling the sand by a vibratory roller for 10-15 times.

In some embodiments, said sprinkling water over the top surface of the layer of aeolian sand comprises: and (3) sprinkling water on the top surface of the layer of the aeolian sand until the water content is: the optimal water content of the aeolian sand layer is +/-5%.

In some embodiments, the step of backfilling said aeolian sand comprises:

and mixing the taken hard layer in the aeolian sand for backfilling.

In some embodiments, the step of applying a cover layer to the backfilled aeolian sand surface comprises:

laying a covering layer with a set thickness;

sprinkling water on the top surface of the layer of cover layer;

the layer of cover is compacted.

In some embodiments, said sprinkling water over the top surface of the layer of the cover layer comprises: and (3) sprinkling water on the top surface of the covering layer until the water content is: the cover layer has an optimal water content of + -5%.

In some embodiments, the cover layer has a thickness of 10cm to 40 cm.

In some embodiments, the cover layer has a thickness of 15cm to 30 cm.

In some embodiments, the method for solidifying the surface of the desert area further comprises the following steps:

spraying a chemical curing agent over the cover layer.

In some embodiments, the removed formation material is crushed or comminuted to obtain pieces or fines of the formation material.

In some embodiments, the formation material is selected from at least one of: limestone and gypsum.

carrying out layer top elevation measurement and compaction coefficient detection on the covering layer and the aeolian sand layer to detect whether the solidified layer meets the field level height and the requirement;

and if the elevation does not reach the standard, backfilling and rolling the covering layer again until the requirement of field leveling is met.

Still other embodiments of the present invention provide a desert area surface solidification structure, including:

a backfill layer comprising a windage sand layer;

and the covering layer is positioned above the aeolian sand layer.

In some embodiments, the desert area surface solidification structure further comprises:

and the curing agent layer is positioned on the top surface of the covering layer.

In some embodiments, the backfill layer has a thickness of 15cm to 50 cm; and/or the thickness of the covering layer is 10 cm-40 cm.

The engineering excavation project requirements meet the conditions of earth excavation and filling balance and minimum total earth volume in the project area, namely the external transportation of sandy soil in the project area and the external transportation of sandy soil outside the project area are reduced. In the process of solidifying the earth surface of a desert engineering area, how to treat a large amount of accumulated sand accumulated on the earth surface is a problem to be solved urgently.

The desert area surface solidification method provided by the embodiment of the invention adopts the desert area underground rock stratum substances which are obtained in situ, has simple raw materials and convenient construction, can efficiently finish the engineering area surface solidification engineering, and achieves the purpose of controlling desertification according to local conditions and according to the material education. The raw materials are taken from the ground and the underground in the project area, so the method is environment-friendly and pollution-free and meets the environment-friendly standard. Furthermore, the raw material cost is low, the construction is convenient, and the requirement of engineering projects on economic cost is met. Finally, according to the requirements of engineering excavation projects, the engineering area field must meet the conditions of earth excavation and filling balance and minimum total earth volume in the engineering area field, and the sand and soil outward transportation in the engineering area are reduced as much as possible.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic flow chart of a method for solidifying the surface of a desert area according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a solidification process of a aeolian sand layer in a method for solidifying a surface of a desert area according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a curing process of a cover layer in a method for curing a surface of a desert area according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a desert area before surface solidification according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of a desert surface solidification structure provided by some embodiments of the present invention;

FIG. 6 is a schematic diagram of a surface solidification structure for a desert area according to another embodiment of the present invention;

reference numerals: 1. a backfill layer; 2. a cover layer; 3. a curing agent layer; 4. a hard layer; 5. a formation material; 6. sandstone; 7. aeolian sand; 8. a ground plane; 11. a sand layer by wind accumulation.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 6.

The solidification of the earth surface of the desert engineering area has the particularity, and the engineering excavation has different environmental protection and engineering requirements in different areas and different countries because of involving numerous regulations, so how to meet the conditions of earth excavation and filling balance and total earth volume minimum in the project area, that is, the engineering excavation is almost completed on the premise that the sand in the project area is not transported outwards and the sand outside the project area is not transported inwards is the problem which needs to be considered urgently in some desert areas at present. In addition, the surface solidification of the desert engineering area needs to consider the following aspects: (1) the surface solidification of the engineering area is the engineering which is firstly completed by the whole engineering, the time requirement is tight, otherwise the whole project progress and the subsequent engineering plan are delayed, and therefore whether the efficient construction can be carried out is an important consideration. (2) The surface solidification of the engineering area has high requirements on environmental protection, and the used materials must meet the standards of the environmental protection requirements. (3) The economic cost requirement is that the economic cost cannot be too high because the area of the engineering area is large, the difficulty of project engineering is increased by the too high economic cost, and the feasibility is low. (4) The ground surface solidification of the engineering area does not influence the normal work of subsequent engineering, equipment and components.

The embodiment of the invention provides a method for solidifying the earth surface of a desert area, in particular to a method for solidifying the earth surface of a desert engineering area based on earthwork balance, which is particularly suitable for the desert engineering area with a large amount of rock substances distributed underground. The main components of the formation material 5 are limestone and Gypsum (Gypsum). The limestone is one of sand-dust limestone, silty limestone and silty-dust limestone or a mixture thereof, and is also called Gatch.

Referring to fig. 4, the geological structure of the desert area is: the geological structure of the desert area is mainly divided into three layers, wherein the uppermost layer is a surface hard layer 4, the middle layer is a rock stratum material 5, and the bottommost layer is sandstone 6.

The upper surface of the hard layer 4 acts as a ground plane 8. The hard layer 4 mainly comprises aeolian sand 7, gravel and weathered sandstone 6, is very dense, but has poor cementation. The hard layer 4 has a thickness of 0.5 to 1.5m and is brittle. Above the hard layer 4 is flowing aeolian sand 7.

The formation material 5 has compressibility characteristics. The sandstone 6 has abundant underground buried amount in desert areas, is easy to break and has no viscosity. After crushing, the maximum grain diameter of the sandstone 6 is not more than 5cm, and the grain diameter of the sandstone 6 after crushing is thicker than that of the aeolian sand 7.

Before the method for solidifying the surface of the desert area provided by the embodiment of the invention is implemented, the rock stratum materials 5 are explored and evaluated in the project area range. The exploration adopts a pit digging or drilling mode, the digging depth is 2 m-10 m, and the bottom of rock stratum materials 5 is dug. The formation material 5 is characterized by: below the bottom of the formation material 5 is sandstone 6. Sandstone 6 is reddish, and smoke is whitish; and the formation material 5 is hard but breakable. The thickness and depth of the rock formation material 5 and the hard layer 4 on the surface layer are measured.

Before solidification begins, excavation or drilling is evenly dispersed throughout the project area. And (4) carrying out spatial analysis such as interpolation according to the data, calculating the reserve volume and spatial distribution of the rock stratum substances 5, and planning an excavation area and a stacking area. And determining the field level according to the earthwork balance requirement. By field-flat, i.e., field-flat, is meant: the original ground is reformed into a field plane meeting the production and living needs of people by digging high and low, and the original natural ground is reformed into a design plane required by engineering on the project.

The method for solidifying the surface of the desert area provided by some embodiments of the invention comprises the following steps:

and step S10, removing the aeolian sand 7 above the hard layer 4 of the area to be solidified.

The aeolian sand 7 refers to sand grains on the surface of the desert area. The grain diameter of the aeolian sand 7 is mainly distributed between 0.075mm and 0.250mm, about 90 percent of the material composition is mainly light minerals such as quartz, feldspar and the like, and the aeolian sand 7 generally exists in arid regions all around the world and has large reserve.

According to the balance requirement of the engineering project on earth excavation and filling, the aeolian sand 7 in the whole project area cannot move outwards. The area of the area needing surface solidification is large, in the actual construction process, the area needs to be constructed step by step, the whole project area can be divided into a plurality of sub-areas, and the aeolian sand 7 in the sub-area is moved, stacked and stored in other adjacent sub-areas during the construction of one sub-area. The surface of the stored wind-laid sand 7 can be covered with a dust screen to prevent dust.

And step S20, taking out the hard layer 4 of the area to be cured.

In step S20, the hard layer 4 of the ground surface is dug away by a forklift or the like, and is transported, stacked and stored in another adjacent sub-area. The hard layer 4 mainly comprises aeolian sand 7, broken stone gravel and weathered sandstone 6. The hard layer 4 has a dense structure but poor cementation, and the thickness of the hard layer 4 is 0.5m to 1.5 m.

The hard layer 4 is reddish and breakable. The rock stratum materials 5 are white, and the structures of all layers of the foundation can be rapidly distinguished according to the colors. Other methods can be used to distinguish the structures of the foundation layers. The dug hard layer 4 is independently piled up and can be used as an auxiliary material of the aeolian sand 7. When the hard layer 4 is accumulated, the surface of the hard layer 4 may be covered with a dust screen to prevent dusting.

And step S30, taking out the rock stratum materials 5 in the area to be solidified.

The formation material 5 mainly includes: limestone and Gypsum (Gypsum). The limestone is one of sand-dust limestone, silty limestone and silty-dust limestone or a mixture thereof, and is also called Gatch. The rock material 5 is excavated by heavy machinery such as an excavator or a forklift. The excavated formation material 5 is quickly transported to a pile-up area for storage, avoiding as much as possible mixing of the formation material 5 with the aeolian sand 7 and the sandstone 6. The surface of the taken-out rock stratum material 5 can be covered with a dust screen to prevent dust.

The extraction depth of the formation material 5 is positively correlated with the amount of the aeolian sand 7 in the step S10; the greater the amount of aeolian sand 7, the more rock formation material 5 needs to be taken out; the less the amount of aeolian sand 7, the less rock formation material 5 needs to be removed.

And step S40, backfilling the aeolian sand 7 to obtain a backfill layer 1.

When backfilling, the aeolian sand 7 is buried layer by layer. Specifically, the aeolian sand 7 with a certain thickness is paved, and then water is sprayed and compacted. After the wind-laid sand layer 11 is formed, a certain amount of wind-laid sand 7 is laid on the surface of the wind-laid sand layer 11. Then sprinkled with water and compacted to form a second layer of aeolian sand 11.

The thickness of the aeolian sand layer 11 is determined by the depth of the excavated rock stratum material 5 and the amount of the aeolian sand layer 11. If the amount of aeolian sand 7 is particularly great, the amount of excavated rock formation material 5 may also be as great as possible, for example, to excavate all of the rock formation material 5 until the sand formation material 5 below the surface is exposed, as much as possible to allow the aeolian sand 7 to be subsequently buried in the rock formation material 5 pit. If the amount of aeolian sand 7 is particularly small, the formation material 5 does not necessarily need to be dug to the bottom as long as the depth of the formation material 5 dug out meets the requirement of final landfill of the aeolian sand 7.

In some embodiments, backfill layer 1 includes three layers of aeolian sand 11. After the bottom sand accretion layer 11 is compacted, the middle sand accretion layer 11 is paved. And after the wind sand layer 11 in the middle layer is compacted, the wind sand layer 11 in the top layer is paved. The thickness of the aeolian sand layer 11 of each layer is 15 cm-50 cm. Further, the thickness of the aeolian sand layer 11 of each layer is 15 cm-30 cm. It should be noted here that the thickness of the aeolian sand layer 11 refers to the thickness of the aeolian sand layer 11 obtained before compaction.

In some embodiments, the windblown sand 7 is laid using a tractor and grader.

In some embodiments, the step S40 specifically includes: the removed aeolian sand 7 is layered and solidified from the bottom layer to the top layer. The layered solidification means that all the aeolian sand 7 to be solidified is solidified layer by layer according to a preset solidification thickness, and the whole backfill layer 1 comprises one or more layers of aeolian sand 7. The backfill layer 1 with higher compactness and bearing capacity can be obtained by layered curing.

Referring to fig. 2, in some embodiments, the curing operation of each layer of aeolian sand 7 comprises the following steps:

and step S401, laying the aeolian sand 7.

Step S402, sprinkling water on the top surface of the layer of the aeolian sand 7.

The top surface sprinkling is to sprinkle water from the top of the layer by adopting a layer top sprinkling method so as to allow the water to freely seep downwards. For non-viscous materials such as aeolian sand and the like, water plays a role in lubricating in the soil particle compaction process, so that the sand particles are more favorably vibrated, rearranged and compacted, and more easily compacted.

In the process of surface solidification, the water used may be fresh water. Because of the scarcity of fresh water in desert areas, water tank trucks are used for hauling the water from outside the project areas.

In the process of surface solidification, the water sprayed may also be salt water. If the groundwater in the area is saline water, the groundwater can be directly exploited. If the area is close to the seaside and the environmental protection conditions are met, seawater can be used. If the area is near a salt lake, the brine of the salt lake can be used. The salt water contains various compounds, and can further promote the hardening of the backfill layer 1.

And (3) sprinkling water on the top surface of the layer of the aeolian sand 7 until the water content is: the optimal water content of the aeolian sand layer is +/-5%. The optimal water content of the aeolian sand layer is n. The water content m of the windy sand layer 11 specifically includes: n-5% to n + 5%. Or n-4% to n + 5%, or n-1% to n + 5%. Or n to n + 4%, or n-2% to n + 3%, or n-1% to n + 5%. The optimal water content of the aeolian sand layer is as follows: and in the compaction curve of the aeolian sand layer, the water content corresponding to the maximum dry volume weight.

In step S403, the layer of aeolian sand 7 is compacted to obtain an aeolian sand layer 11.

And rolling the first layer of aeolian sand 7 for 10-15 times. The rolling equipment is a vibratory roller, the weight is more than 20T, the vibration frequency is 0 Hz-31 Hz, the amplitude is 0.9 mm-1.8 mm, and the speed is 2-5 km/h. When the rolling passes are 2-4 times, the requirement of the compaction coefficient of 0.90 can be met or exceeded; when rolling is performed for 10-12 times, the compaction coefficient can reach 0.96-0.99, and the engineering requirement standard is met.

The "coefficient of compaction" means: the ratio K of the actual dry density of the compacted subgrade to the maximum dry density of the test specimen obtained from the compaction test. The compaction quality of the roadbed is expressed by the construction compaction degree K%. The closer the compaction factor is to 1, the higher the compaction quality requirement. The maximum dry density corresponds to the water content, which is referred to as the optimum water content.

After the first sand accretion layer 11 is obtained, the above steps S401 to S403 are repeated to obtain other layers of sand accretions 11.

In other embodiments, the step S40 backfilling the wind-blown sand 7 includes: the removed hard layer 4 is mixed in aeolian sand 7 and backfilled. The backfill layer 1 may be a mixture of aeolian sand 7 and a hard layer 4. The hard layer 7 is also used as a backfill material, so that the field level requirement can be met more easily, and the hard layer 7 can obtain a material with smaller granularity without excessive additional processing operation.

Step S50, the covering layer 2 is laid on the surface of the backfill layer 1. Wherein the overburden 2 is a fragment or cuttings of the formation material 5.

The material of the laid cover layer 2 is determined by the material of the excavated rock formation material 5, such as sand-dust limestone, silty-dust limestone, gypsum, or a mixture thereof. In some embodiments, the removed formation material 5 is crushed or otherwise comminuted to provide pieces or fines of the formation material 5 for subsequent use as overburden 2.

The thickness of the covering layer 2 is 10cm to 40cm, specifically 15cm to 30cm, for example.

Referring to fig. 3, in some embodiments, the step S50 of paving the cover layer 2 on the surface of the backfilled wind-blown sand 7 specifically includes:

in step S501, a cover layer 2 having a predetermined thickness is laid.

Step S502, water is sprayed on the top surface of the layer of the cover layer 2.

In the process of surface solidification, the water sprayed may also be salt water. If the groundwater in the area is saline water, the groundwater can be directly exploited. If the area is close to the seaside and the environmental protection conditions are met, seawater can be used. If the area is near a salt lake, the brine of the salt lake can be used. The salt water contains various compounds, and can further promote the hardening of the covering layer 2.

In step S503, the layer of cover layer 2 is compacted.

And (3) rolling the covering layer 2, wherein the requirement of the compaction coefficient of 0.90 can be met or exceeded after 2-4 times of rolling, and the compaction coefficient of 0.96-0.97 can be met after 10-12 times of rolling, so that the engineering requirement standard is met.

After compaction of the cover layer 2, the compaction factor of the cover layer 2 is checked to determine whether the engineering requirements are met. And if the engineering requirements are not met, rolling again until the engineering requirements are met.

In some embodiments, the step of spraying water on the top surface of the layer of cover layer 2 comprises: water is sprayed on the top surface of the covering layer 2 until the water content of the covering layer 2 is: the cover layer has an optimal water content of + -5%. The optimal water content of the covering layer is b. The water content a of the cover layer 2 is specifically, for example: b-5% to b + 5%. Alternatively, b-3% to b + 5%, alternatively, b to b + 5%. Or b to b + 4%, or b-2% to b + 3%. Wherein, the optimal water content of the covering layer is as follows: the maximum dry bulk weight corresponds to the moisture content of the compacted curve of the cover.

In some embodiments, the thickness of the cover layer 2 is 10cm to 40cm, such as 10cm, 20cm, 30cm, 40 cm.

In some embodiments, the thickness of the cover layer 2 is 15cm to 30cm, such as 15cm, 20cm, 25cm, 30 cm.

After the above step S50, the following step S60 is further included: and (4) carrying out layer top elevation measurement and compaction coefficient detection on the whole solidified layer so as to detect whether the solidified layer meets the field level height and the requirement. If the elevation does not reach the standard, the covering layer 2 can be backfilled and rolled again until the requirement of field leveling is met.

In some embodiments, the method for solidifying the surface of the desert area further comprises the following step S70: a chemical curing agent is sprayed over the cover layer 2 to obtain a curing agent layer 3.

In order to prevent dusting, a chemical curing agent is sprayed on the top of the formed cover layer 2 of the cured layer. The chemical curing agent forms a cementing layer on the surface of the covering layer 2, namely the curing agent layer 3, and the curing agent layer 3 prevents the ground from being damaged by machinery and the like to form dust release.

The embodiment of the invention also provides a surface solidification structure for the desert area, which is obtained by adopting any one of the surface solidification methods for the desert area in the embodiment of the invention.

Referring to fig. 4 and 5, the desert surface solidification structure provided by the embodiment of the invention comprises a backfill layer 1 and a covering layer 2. The backfill layer 1 comprises a layer of aeolian sand 11. The cover layer 2 is located above the aeolian sand layer 11.

The aeolian sand 7 is adopted to form the aeolian sand layer 7, so that the requirement of surface solidification in the desert area is met under the condition of meeting the requirement of field leveling, the construction difficulty and the construction cost are further reduced, and the construction efficiency is improved.

Referring to fig. 5 and 6, in some embodiments, the desert surface curing structure further comprises a curing agent layer 3, and the curing agent layer 3 is positioned on the top surface of the covering layer 2. The curing agent layer 3 prevents the floor from being damaged by machinery or the like to cause dust emission.

In some embodiments, the backfill layer 1 has a thickness of 15cm to 50 cm. And/or the thickness of the covering layer 2 is 10 cm-40 cm.

Referring to fig. 5, in some embodiments, the amount of aeolian sand 7 is relatively large, so it is necessary to dig out all of the formation material 5 to meet the project area field level requirements. Therefore, after the surface of the desert area is solidified, the sandstone 6 is directly arranged below the aeolian sand layer 11.

Referring to fig. 6, in some embodiments, the amount of aeolian sand 7 is relatively large, so that the requirement of project site levelness can be met without the need to dig out all of the formation material 5. Therefore, after the surface of the desert area is solidified, the rest unearthed rock stratum materials 5 are directly arranged below the aeolian sand layer 11, and the sandstone 6 is arranged below the rock stratum materials 5.

According to the technical scheme, the aeolian sand 7 on the ground surface of the project area is used as a backfill substance to form a backfill layer 1, and the backfill layer 1 comprises at least one aeolian sand layer 11. While the formation material 5 in the subsurface of the zone of interest acts as the uppermost overburden 2 of the solidified layer. By the technical scheme, the earthwork balance in the project area is met, the purposes of ground surface solidification and accumulated sand disappearance in the project area are achieved, and the field leveling project is completed.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for solidifying the surface of a desert area is characterized by comprising the following steps:

removing the aeolian sand above the hard layer of the area to be solidified;

taking out the hard layer of the area to be solidified;

taking out rock stratum materials of the area to be solidified;

backfilling the aeolian sand to obtain a backfill layer;

2. The method as claimed in claim 1, wherein the step of backfilling the sand includes the steps of:

3. The method for solidifying the surface of the desert area as claimed in claim 2, wherein the operation of solidifying each layer of the aeolian sand comprises the following steps:

laying the aeolian sand;

sprinkling water on the top surface of the layer of aeolian sand;

4. The method for solidifying the surface of the desert area as claimed in claim 3, wherein the set thickness is 15cm to 50 cm.

5. The method for solidifying the surface of the desert area as claimed in claim 4, wherein the set thickness is 15cm to 30 cm.

6. The method of claim 3, wherein said step of compacting said layer of aeolian sand comprises:

and rolling the sand by a vibratory roller for 10-15 times.

7. The method of claim 3, wherein the step of spraying water on the top surface of the layer of aeolian sand comprises: and (3) sprinkling water on the top surface of the layer of the aeolian sand until the water content is: the optimal water content of the aeolian sand layer is +/-5%.

8. The method as claimed in claim 1, wherein the step of backfilling said aeolian sand comprises:

and mixing the taken hard layer in the aeolian sand for backfilling.

9. The method for solidifying the surface of the desert area as claimed in claim 1, wherein the step of laying a covering layer on the surface of the backfilled aeolian sand comprises the following steps:

laying a covering layer with a set thickness;

sprinkling water on the top surface of the layer of cover layer;

the layer of cover is compacted.

10. The method of claim 9, wherein the step of spraying water on the top surface of the layer of cover layer comprises: and (3) sprinkling water on the top surface of the covering layer until the water content is: the cover layer has an optimal water content of + -5%.

11. The method for solidifying the surface of the desert area as claimed in claim 1, wherein the thickness of the covering layer is 10cm to 40 cm.

12. The method for solidifying the surface of the desert area as claimed in claim 1, wherein the thickness of the covering layer is 15cm to 30 cm.

13. The method for solidifying the surface of the desert area as claimed in claim 1, further comprising the steps of:

spraying a chemical curing agent over the cover layer.

14. The method of claim 1, wherein the removed rock formation material is crushed or ground to obtain fragments or fines of the rock formation material.

15. The method of claim 1, wherein the formation material is selected from at least one of the following: limestone and gypsum.

16. The method for solidifying the surface of the desert area as claimed in claim 1, further comprising the steps of:

17. A desert area surface solidification structure, comprising:

a backfill layer (1), the backfill layer (1) comprising a windage sand layer (11);

a cover layer (2) located above the aeolian sand layer (11).

18. The desert area surface solidification structure of claim 17, further comprising:

and the curing agent layer (3) is positioned on the top surface of the covering layer (2).

19. The desert area surface solidification structure as claimed in claim 17, wherein the backfill layer (1) has a thickness of 15cm to 50 cm; and/or the thickness of the covering layer (2) is 10 cm-40 cm.