CN115029970A

CN115029970A - Automatic anti-seepage access road structure suitable for soft soil foundation of ecological sensitive area and construction method

Info

Publication number: CN115029970A
Application number: CN202210695233.2A
Authority: CN
Inventors: 乔伟; 国璟; 周玖庆; 王洪章; 宋亮; 温章寿; 郑孝炼; 林达明; 杨成连; 林兴麟
Original assignee: China Communications 2nd Navigational Bureau 3rd Engineering Co ltd; Ningde Sanduao Expressway Co ltd; CCCC Second Harbor Engineering Co; Research Institute of Highway Ministry of Transport
Current assignee: China Communications 2nd Navigational Bureau 3rd Engineering Co ltd; Ningde Sanduao Expressway Co ltd; CCCC Second Harbor Engineering Co; Research Institute of Highway Ministry of Transport
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-09-09

Abstract

The disclosure relates to an automatic anti-seepage access road structure suitable for soft soil foundation of an ecological sensitive area and a construction method. The automatic seepage-proofing access road structure consists of a roadbed main body structure and a super seepage-proofing soil layer, wherein the roadbed main body structure comprises a lime soil layer laid on a soft soil roadbed; spraying an anti-seepage material on the roadbed soil to form a super anti-seepage soil layer, and paving the foundation super anti-seepage soil layer at the roadbed base; the surface layer super impermeable soil layer is laid on the top surface of the roadbed; the side slope super impermeable soil layer is laid at the side slope of the roadbed; and the base super impervious soil layer, the surface super impervious soil layer and the side slope super impervious soil layer are synthesized into a closed-loop super impervious structure around the cross section of the roadbed main structure. The super-impermeable waterproof layer is formed on the surface layer of the roadbed foundation and around the roadbed, so that erosion of rainwater and underground water to the roadbed is reduced, pollution of lime to peripheral soil and water sources in water circulation is inhibited, and after-construction re-cultivation is carried out only by digging away soil filled in the roadbed.

Description

Automatic anti-seepage access road structure suitable for soft soil foundation of ecological sensitive area and construction method

Technical Field

The disclosure relates to the technical field of road traffic, in particular to a roadbed seepage prevention technology, and specifically relates to an automatic seepage prevention access road structure suitable for a soft soil foundation of an ecological sensitive area and a construction method.

Background

In the construction of various levels of roads in complex areas, construction access roads are often required to be temporarily built, so that the construction efficiency is improved, and the construction cost is reduced. The construction road has relatively high requirements on road load and pressure resistance due to timeliness. In southern provinces such as Fujian province and Jiangsu province, a certain amount of lime is often added into construction road soil, so that the soil is changed to form certain strength. The lime and the soil are interacted in series to form a plate body, so that the strength and the stability are improved.

In developed regions of south water systems, the materials are widely applied to roadbed bottom filling due to convenience and economy, but loose rock-soil materials such as lime and the like have certain influence on the natural environment and surrounding soil in a specific construction process. Particularly, in rainy season, the roadbed of the sidewalk is affected by infiltration and softening of rainwater, the strength of the roadbed is reduced in different degrees, and the construction efficiency and the construction quality are affected to a certain degree.

For construction projects across ecological sensitive areas, the construction conditions are severe especially in wetland red lines, and the requirement on environmental protection is high. The conventional roadbed filling is that lime is directly filled at the bottom of the roadbed, and harmful components in the lime and the lime are brought to peripheral water sources and soil to cause pollution under the action of precipitation and underground water circulation. Construction roads are built on the temporarily acquired farmland in engineering, and reclamation is needed after the engineering is finished. When the roadbed of the construction sidewalk is treated, the pollution of lime to cultivated land is serious, and the growth of crops is influenced after the re-cultivation, so that the environment is polluted and the loss of agricultural economy is caused. Therefore, in the construction process of the roadbed lime, the problem of pollution of the lime to the environment is solved, and the method is not only the requirement of construction enterprises on establishing civilized construction sites and green construction sites, but also the development requirement of the enterprises.

Disclosure of Invention

The purpose of the disclosure is to solve the problems that the roadbed is not suitable for an ecological sensitive area and is not beneficial to reclamation after construction in the prior art, and provide an automatic anti-seepage pavement structure and a construction method suitable for a soft soil foundation of the ecological sensitive area, which overcome the defects that the roadbed of the construction pavement is unevenly settled due to water erosion, and simultaneously inhibit the lime in the roadbed of the construction pavement from polluting the surrounding soil and water along with water circulation, and particularly solve the problem of pure green reclamation in the later period of a farmland which needs to be temporarily expropriated for reclamation.

The present disclosure is implemented as follows:

the first aspect of this disclosure provides an automatic prevention of seepage pavement structure suitable for ecological sensitive area soft soil foundation, its characterized in that mainly comprises road bed major structure and super prevention of seepage soil layer, wherein: the roadbed main body structure comprises a lime soil layer laid on a soft soil roadbed, and a brick slag or slag layer and a gravel layer which are laid on the lime soil layer in a layered manner from bottom to top; the ultra-impermeable soil layer is formed by spraying an impermeable material on roadbed soil, and the impermeable material is uniformly mixed with the roadbed soil and forms nano-scale porous particles with ultra-impermeable characteristics on the surface of soil particles after chemical reaction is completed; the super impermeable soil layer comprises a foundation super impermeable soil layer, a surface super impermeable soil layer and a side slope super impermeable soil layer, wherein the foundation super impermeable soil layer is laid at the foundation of the roadbed and below the lime soil layer; the surface layer super impervious soil layer is laid on the top surface of the roadbed, and is above the gravel layer; the side slope super impermeable soil layer is laid at the side slope of the roadbed; and the foundation ultra impervious soil layer, the surface ultra impervious soil layer and the side slope ultra impervious soil layer are combined into a closed-loop ultra impervious structure around the cross section of the roadbed main body structure. The anti-seepage material is sprayed on the surface layer of the roadbed foundation and the periphery of the roadbed to form a super anti-seepage waterproof layer, so that erosion of rainwater and underground water to the roadbed is reduced. The closed-loop ultra-impermeable soil layer formed around the roadbed completely inhibits the circulation of water in the roadbed, thereby inhibiting the pollution of lime and the pollution components in the lime to surrounding soil and water sources in water circulation, and the roadbed is only required to be dug away after the re-cultivation after the construction. The temporary construction pavement is particularly suitable for being built on a soft soil roadbed in an ecological sensitive area, vehicles can be driven in a rainy day after the roadbed construction is finished, a muddy road surface can not be formed when the vehicles are driven in the rainy day relative to a common soil roadbed, the strength of the roadbed is maintained unchanged, the construction traffic is guaranteed to be driven, and the construction efficiency is improved.

In some embodiments, the foundation ultra impermeable soil layer is formed by plowing the roadbed foundation topsoil sprayed with the impermeable material to a thickness of 15cm and then compacting, and the thickness is 10 cm.

In some embodiments, the face layer ultra impermeable soil layer and the side slope ultra impermeable soil layer are formed by spraying impermeable material and penetrating 2-5cm downwards, and the thickness is 2-5 cm.

In some embodiments, the soil-filling layer is filled at the roadbed side slope, and the side slope super impermeable soil layer is formed after impermeable materials are sprayed on the side slope soil-filling layer and naturally infiltrated; preferably, the filling thickness of the side slope filling layer is 20-50cm, and the impermeable material permeates 2-5cm on the side slope filling layer.

In some embodiments, the soil block further comprises a surface thin soil layer, wherein the surface thin soil layer is laid above the crushed stone layer, and the surface super impermeable soil layer is formed after impermeable materials are sprayed on the surface thin soil layer and naturally infiltrated; preferably, the thickness of the surface thin soil layer is 2-5 cm.

In some embodiments, the barrier material is a "hard-loaded" barrier material made from: organic compound, catalyst, water; wherein the fixed ratio of the organic compound to the catalyst is 10: 1, the synthetic organic matter and the catalyst account for 2-80 percent of the total weight of the barrier material, and the water accounts for 98-20 percent of the total weight of the hard-loaded barrier material.

In some embodiments, the organic composition component is a hydrosiloxane polymer having the formula:

the catalyst is fatty alcohol or ester compound, and contains nickel, lead and zinc.

In some embodiments, the "hard-loaded" barrier material is present in a concentration of 0.5% to 10% and is sprayed with 4 to 7kg per square meter of roadbed soil, the effective organic composition content of the "hard-loaded" barrier material per square meter of roadbed soil being not less than 100 g.

In some embodiments, the "hard-loaded" barrier material is prepared by: dissolving the organic compound and the catalyst in water in proportion, controlling the water temperature to be about 38 ℃ during dissolving, stirring for one hour by using a stirrer to form uniform liquid, standing the liquid after stirring, and sealing and storing when the temperature is reduced to normal temperature.

Another aspect of the present disclosure provides a construction method of an automatic anti-seepage access road structure, including the following steps:

firstly, excavating an excavation roadbed foundation to a designed elevation, and burying a filling roadbed foundation to the designed elevation for leveling and compacting treatment;

uniformly spraying the diluted hard-loaded anti-seepage material on the surface layer of the roadbed foundation, ploughing the surface layer soil after spraying, controlling the ploughing thickness within 15cm, and compacting after the ploughing reaches the optimal water content in the roadbed foundation soil layer to form a foundation ultra-anti-seepage soil layer;

step three, after the substrate super impermeable soil layer is naturally dried, roughening the surface layer, filling lime and compacting to form a lime soil layer;

paving brick slag or slag on the lime soil layer and compacting to form a brick slag or slag layer;

step five, paving broken stones on the brick slag or slag layer and compacting the broken stones to form a broken stone layer;

laying a thin layer of clay on the surface of the crushed stone layer to form a surface thin soil layer;

step seven, carrying out roadbed side slope filling and finishing, and filling a side slope filling layer at the roadbed side slope;

and step eight, spraying a 'hard-loaded' impermeable material on the surface thin soil layer and the side slope filling layer, wherein the 'hard-loaded' impermeable material naturally permeates into the surface of the roadbed and the soil body of the roadbed side slope and is naturally dried to form a surface super impermeable soil layer and a side slope super impermeable soil layer.

Compared with the prior art, the automatic anti-seepage access structure provided by the disclosure has the following advantages:

(1) the anti-seepage material is sprayed on the surface layer of the roadbed foundation and the periphery of the roadbed to form a super anti-seepage waterproof layer, so that erosion of rainwater and underground water to the roadbed is reduced.

(2) The super impermeable soil layer on the surface layer of the roadbed foundation can inhibit the rising of capillary water and the permeation of water in the roadbed, thereby inhibiting the erosion of underground water on the roadbed.

(3) The super impermeable soil layer of the roadbed surface layer and the roadbed side slope can inhibit rainwater from permeating into the roadbed, protect the roadbed from being soaked by the rainwater to subside, and simultaneously can form a natural drainage side slope to enable the rainwater to flow into a drainage ditch completely.

(4) The vehicle can be driven in rainy days after the roadbed construction is finished, and compared with the common roadbed, the vehicle can not form a muddy road surface in rainy days, so that the roadbed strength is maintained unchanged, the construction traffic is guaranteed to pass, and the construction efficiency is improved.

(5) The closed-loop ultra-impermeable soil layer formed on the periphery of the roadbed completely inhibits the circulation of water in the roadbed, thereby inhibiting the pollution of lime and the pollution components in the lime on the peripheral soil and water sources in the water circulation. After-construction re-cultivation is carried out only by digging out the filled soil of the roadbed.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes should still fall within the scope covered by the technical contents disclosed in the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure.

FIG. 1 is a schematic sectional view of an embodiment of an automatic anti-seepage access structure;

FIG. 2 is a schematic sectional view of another embodiment of an automatic anti-seepage access structure;

FIG. 3 is an enlarged view of area A of FIG. 1;

FIG. 4 is an enlarged view of area B of FIG. 2;

FIG. 5 is a schematic view of a soil particle surface nano-scale porous micro-particle with ultra-impermeable characteristics;

FIG. 6 is a schematic representation of the surface of a soil particle having ultra-impervious properties;

FIG. 7 is a comparative diagram of road surface seepage-proofing experiments for different seepage-proofing material coverage thicknesses of a certain highway construction pavement;

FIG. 8 is a diagram of a structure of an apparatus in a soil anti-seepage test room of a highway construction pavement;

FIG. 9 is a schematic view of the water repellency grades of different concentrations of treated soils;

FIG. 10 is a schematic view of the surface of a post-rain roadbed without an impermeable material in a highway construction pavement;

FIG. 11 is a schematic view of the surface of a rainy roadbed which uses an anti-seepage material for a highway construction pavement.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the present disclosure is described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present disclosure and their description are provided herein for the purpose of explanation, but not limitation, of the disclosure.

In the description of the present disclosure, it is to be understood that the terms "comprises/comprising," "consists of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/… …", "consisting of … …" does not exclude the presence of additional like elements in a product, device, process or method that comprises the element.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like, indicate an orientation or positional relationship based on that shown in the drawings for ease of description and simplicity of description only, and do not indicate or imply that the referenced device, component, or structure must have a particular orientation, be constructed or operated in a particular orientation, and should not be construed as limiting the present disclosure.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

The following detailed description of implementations of the present disclosure is provided in connection with preferred embodiments.

The invention discloses an automatic anti-seepage pavement structure suitable for soft soil foundations of ecological sensitive areas, which belongs to an automatic anti-seepage green pavement construction technology and is popularized and used in the ecological sensitive areas. The specific structure and composition of the automatic anti-seepage access structure are explained in detail in the following with specific drawings.

Referring to fig. 1, fig. 1 shows a cross-sectional composition of an automatic anti-seepage access structure of a preferred embodiment. In the figure, a substrate super impermeable soil layer 1, a lime soil layer 2, a brick slag or slag layer 3, a gravel layer 4 and a surface super impermeable soil layer 5 are sequentially arranged from bottom to top in the vertical direction; the lime soil layer 2, the brick slag or slag layer 3 and the crushed stone layer 4 jointly form a roadbed main body structure of the pavement structure, and play a main vertical bearing role. And a slope super impermeable soil layer 7 is laid at one side or two sides of the roadbed main body structure in the transverse direction. The foundation ultra-impermeable soil layer 1 is laid at the foundation of the roadbed, the limestone soil layer 2 is laid below, the surface layer ultra-impermeable soil layer 5 is laid at the top surface of the roadbed, the gravel layer 4 is laid above, the side slope ultra-impermeable soil layer 7 is laid on the side slope of the roadbed, and the foundation ultra-impermeable soil layer is laid at one side or two sides of the side slope according to the actual condition of the roadbed.

It is easy to understand that the base super impermeable soil layer 1, the surface super impermeable soil layer 5 and the side slope super impermeable soil layer 7 constitute a super impermeable soil layer of the whole roadbed main structure, and the base super impermeable soil layer 1, the surface super impermeable soil layer 5 and the side slope super impermeable soil layer 7 are synthesized into a closed-loop super impermeable structure around the cross section of the roadbed main structure. The closed-loop ultra-seepage-proofing structure forms full-surrounding and all-around seepage-proofing protection on the main structure of the roadbed from the vertical direction, the horizontal direction and the longitudinal direction, prevents rainwater on the road surface from seeping downwards, inhibits the pollution of surrounding soil and water caused by lime in the roadbed of the construction access road along with water circulation, and prevents the roadbed of the construction access road from generating uneven settlement due to water erosion.

For the formation of the super impermeable soil layer, the impermeable material is sprayed on the surface layer of the roadbed foundation and the periphery of the roadbed to form a super impermeable waterproof layer, also called a super hydrophobic soil layer.

Specifically, for the foundation ultra-impermeable soil layer 1 laid on the roadbed base, the diluted impermeable materials are uniformly sprayed on the roadbed base by a sprinkler during specific implementation, the impermeable materials naturally permeate into soil below 5cm of the roadbed base, and compaction treatment is carried out when the optimal water content is reached after the soil sample of the base is naturally aired, so that the roadbed can prevent groundwater from reversely permeating (upward permeating) into the roadbed.

As a more preferable scheme, the surface soil is ploughed by a cultivator after the impermeable material is sprayed, the ploughing thickness is controlled to be about 15cm, and the ploughed soil is compacted after the foundation soil layer of the roadbed reaches the optimal water content to form the foundation ultra impermeable soil layer 1. The foundation ultra-impermeable soil layer 1 isolates the whole roadbed from an original soil layer below the foundation, so that capillary water below the roadbed is prevented from rising, the roadbed is prevented from being unevenly settled due to water erosion, and meanwhile, lime in the lime soil layer 2 tightly attached to the foundation of the roadbed can be prevented from invading into peripheral soil to pollute the peripheral soil and water sources. Preferably, the thickness of the base ultra impermeable soil layer 1 is thicker than that of the surface layer ultra impermeable soil layer 5 and the side slope ultra impermeable soil layer 7, for example 10cm, considering that the thickness can be 15cm under vertical compression resistance, the position of the base ultra impermeable soil layer 1 determines that the base ultra impermeable soil layer has certain compression strength and is used as a vertical bearing structure together with the roadbed main structure, therefore, the surface soil is ploughed by a ploughing machine after the impermeable material is sprayed, the ploughing is carried out after the roadbed base soil layer reaches the optimal water content, the impermeable material and soil particles fully undergo chemical reaction by virtue of the ploughing and compacting process after the impermeable material is sprayed, nano-scale porous particles with the ultra impermeable characteristic are formed more effectively, and the compression modulus and the compression strength of the formed base ultra impermeable soil layer 1 are also improved to a certain extent, tests show that the compressive strength of the soil after the anti-seepage material is sprayed and ploughed can be improved by 10-20% approximately, so that certain contribution can be provided for the vertical bearing of the whole roadbed.

For the surface layer super impermeable soil layer 5 laid on the road base surface layer, in the concrete implementation, the diluted impermeable material is uniformly sprayed on the crushed stone layer 4 by using a sprinkler, and the impermeable material naturally permeates on the crushed stone layer 4 and then forms the surface layer super impermeable soil layer 5 together with the crushed stone layer 4 to serve as the road base surface layer waterproof structure, as shown in fig. 3; when the surface thin soil layer 8 is arranged, the impermeable material is uniformly sprayed on the surface thin soil layer 8, and the impermeable material naturally permeates on the surface thin soil layer 8 and then forms a surface super impermeable soil layer 5 together with the surface thin soil layer 8 to serve as a roadbed surface waterproof structure, as shown in fig. 4. The surface layer super impervious soil layer 5 can inhibit rainwater infiltration at the upper part and capillary water rising inside, so that the uneven settlement of the roadbed caused by water erosion is avoided, and meanwhile, the circulation of water inside the roadbed structure can be inhibited. Preferably, the thickness of the surface layer ultra impermeable soil layer 5 is thinner than that of the substrate ultra impermeable soil layer 1, when the surface layer thin soil layer 8 is arranged, the thickness of the surface layer thin soil layer 8 is 2-5cm, the surface layer thin soil layer 8 is only used as a carrier for spraying impermeable materials and downwards permeating, the surface layer ultra impermeable soil layer 5 can be effectively formed, and the surface layer ultra impermeable soil layer is not used as a vertical bearing structure, so that the surface layer ultra impermeable soil layer is not required to be designed to be too thick, otherwise the surface layer impermeable effect can be influenced, and even the roadbed surface is too muddy.

For the side slope ultra impermeable soil layer 7 paved at the side slope of the roadbed, the diluted impermeable material is uniformly sprayed at the side slope of the roadbed main body structure during specific implementation, when the side slope filling layer 6 is filled, the diluted impermeable material is uniformly sprayed on the side slope filling layer 6, and the impermeable material naturally permeates on the side slope to form the side slope ultra impermeable soil layer 7 serving as the roadbed side slope waterproof structure. The slope super impermeable soil layer 7 encloses a roadbed main body structure from two sides of the roadbed and is connected with the base super impermeable soil layer 1 and the surface layer super impermeable soil layer 5 to form a closed impermeable structure, so that rainwater can be inhibited from infiltrating into the roadbed from the slope, the roadbed is prevented from being unevenly settled due to water erosion, the circulation of water in the roadbed structure can be inhibited, and the lime in the lime soil layer 2 is inhibited from invading into peripheral soil from the slope to pollute peripheral soil and water sources. The thickness of the side slope ultra impermeable soil layer 7 is preferably thinner than that of the substrate ultra impermeable soil layer 1, but the filling thickness of the side slope fill layer 6 is preferably designed to be thicker when the side slope fill layer 6 is filled, for example, 20-50cm, greening, vegetation and the like can be planted on the side slope fill layer 6 in the later period to improve the stability of the side slope, but the impermeable material only needs to permeate 2-5cm on the side slope fill layer 6 to form the stable side slope ultra impermeable soil layer 7.

It should be noted that the base ultra impermeable soil layer 1, the surface ultra impermeable soil layer 5 and the side slope ultra impermeable soil layer 7 may be independent layers which are laid separately, or may be a structure formed by combining the impermeable material and the corresponding soil layer or gravel layer, that is, the impermeable material permeates into the corresponding soil layer or gravel layer and is integrated with the corresponding soil layer or gravel layer, and there is no obvious boundary between the two layers.

In some embodiments, the automatic anti-seepage pavement structure further comprises a side slope filling 6, wherein the side slope filling 6 is laterally filled on one side or two sides of the roadbed main body structure, and in the case of filling the side slope filling 6, the side slope ultra-impervious soil layer 7 is laid on the side slope filling 6. The side slope filling layer 6 adopts filling roadbed soil or cohesive soil, and the side slope filling layer 6 is filled at the side slope of the roadbed: the roadbed main body structure comprises a lime soil layer 2, a brick slag or slag layer 3 and a rubble layer 4, material pores and gaps of the structure layers are large, the viscosity is small or no viscosity is generated, a compact impervious layer is difficult to form after an impervious material is sprayed on the surface of the structure layers, a side slope filling layer 6 is filled at a side slope, the filling material is roadbed soil or cohesive soil, then the impervious material is sprayed on the side slope filling layer 6, and the impervious material can form a side slope super impervious soil layer 7 in soil particles of the side slope filling layer 6, so that an impervious effect is achieved.

In some embodiments, the automatic anti-seepage pavement structure further comprises a superficial thin soil layer 8, as shown in fig. 2, the superficial thin soil layer 8 is laid above the gravel layer 4, the superficial thin soil layer 8 can be made of roadbed soil, preferably cohesive soil, after the superficial thin soil layer 8 is laid, the anti-seepage material is sprayed on the superficial thin soil layer 8, compared with the direct spraying on the gravel layer 4, a dense anti-seepage layer is formed on the cohesive soil layer after penetrating soil particles, namely an effective superficial super-anti-seepage soil layer 5 is formed more easily, and the anti-seepage effect is achieved.

In some embodiments, the barrier material is preferably a type of barrier material having "hard-loaded" characteristics, i.e., water is loaded on hydrophobic soil like on lotus leaves, and the "hard" characteristic is that the barrier material can simultaneously improve the compressive strength of soil and meet the load-bearing requirement.

In some embodiments, the present disclosure provides a particular "hard-loaded" barrier material made from the following raw materials: organic compound, catalyst, water; wherein the fixed ratio of the organic compound to the catalyst is 10: 1, the synthetic organic matter and the catalyst account for 2-80 percent of the total weight of the barrier material, and the water accounts for 98-20 percent of the total weight of the hard-loaded barrier material. The content of the organic composition in the industrial production may be any solubility of 70% or less.

The organic composition component is a hydrogen-containing siloxane polymer, and the structural formula is as follows:

the catalyst is fatty alcohol or ester compound, and contains nickel, lead and zinc, so that the chemical reaction speed of the organic compound and soil is increased.

The preparation method of the 'hard-loaded' impermeable material comprises the following steps: dissolving the organic compound and the catalyst in water in proportion, controlling the water temperature to be about 38 ℃ during dissolving, stirring for one hour by using a stirrer to form uniform liquid, standing the liquid after stirring, and sealing and storing when the temperature is reduced to normal temperature.

The seepage-proofing principle of the super seepage-proofing soil layer obtained by spraying the hard-charged seepage-proofing material is as follows: spraying a 'hard-loaded' anti-seepage material on the roadbed soil, wherein the 'hard-loaded' anti-seepage material is uniformly mixed with the roadbed soil and forms nano-scale porous particles with super anti-seepage characteristics on the surface of soil particles after chemical reaction is finished, and as shown in fig. 5, the surface of the original soil body particularly has the following characteristics: 1. hydrophobic with low surface energy; 2. a suitable surface roughness; 3. low sliding angle. Based on the surface tension effect of water, the contact angle of a water drop on an inclined surface is changed under the action of the self gravity, and the contact angle hysteresis phenomenon exists, wherein the contact angle hysteresis refers to the difference between an advancing contact angle and a retreating contact angle of a solid surface, and the contact angle hysteresis enables water not to wet super-hydrophobic soil and water not to pass through pores of the super-hydrophobic soil under the action of the tension of the water, so that the 'hard-loaded' anti-seepage material achieves the effect of automatic anti-seepage. As shown in fig. 6, the rainwater beads completely stay on the surface of the ultra impermeable soil layer, the ultra impermeable soil layer can inhibit rainwater infiltration and capillary water rising, and can inhibit water circulation in the roadbed structure while avoiding uneven settlement of the roadbed due to water erosion, thereby inhibiting pollution of lime on peripheral soil and water sources.

The "hard-loaded" barrier material concentrations described above were tested (as will be described later) to yield the appropriate amount of spray and the appropriate concentration based on the condition of the subgrade foundation and the properties of the soil. Preferably, the concentration of the 'hard-loaded' impermeable material is 0.5% -10%, the concentration is designed according to different soil qualities and impermeable effects, the higher the concentration is, the better the impermeable effect is, the higher the concentration is selected for complete impermeable, the lower the concentration is if the soil needs to have certain permeability in the area where plants need to be planted, and the 10% is selected according to field tests in the southern rainwater-rich area. In order to ensure the soil and the impervious material to fully react, 4-7kg, preferably 5kg, of effective organic composite component containing the 'hard-loaded' impervious material is sprayed per square meter. After spraying, the impermeable soil layer can be formed in two or three days in spring and summer.

Through thickness tests, as shown in a road surface seepage-proofing experiment result of different seepage-proofing material coverage thicknesses of a certain highway construction pavement in figure 7, seepage-proofing material is not added, surface water seeps rapidly, after the seepage-proofing material is added, the produced seepage-proofing effect is immediately shown, the seepage-proofing effect can be reduced by more than 90%, the strength of a roadbed soil body is prevented from being reduced, the seepage-proofing effect is better and better along with the increase of the seepage-proofing coverage thickness, but the seepage-proofing effect is not obviously increased when the thickness of an seepage-proofing soil layer is continuously increased within 4-10cm, therefore, the thickness of the seepage-proofing soil layer is controlled within 1-10cm, the average thickness is 5cm, the optimal seepage-proofing effect can be achieved, the requirement of substrate bearing is considered, the average thickness is not more than 15cm, and otherwise, material waste can be caused.

The present disclosure employs a spray concentration test to determine the appropriate concentration of "hard-loaded" barrier material.

Test one: 'hard-charged' impermeable material spraying concentration test-drip penetration time test

Diluting the 'hard-loaded' impermeable materials with different concentrations (0.1%, 0.3%, 0.5%, 0.7%, 0.9%); uniformly mixing the diluted hard-loaded anti-seepage material with a roadbed soil sample to form super anti-seepage soil; after the mixing is finished, drying in an oven (with the set temperature of 105 ℃ for 24 hours); weighing the dried ultra-impermeable soil sample, loading the dried ultra-impermeable soil sample into a sample box, sucking pure distilled water (one drop of 0.05mL) by using a rubber head dropper, keeping the vertical distance between the drop and the surface of the measured ultra-impermeable soil sample to be less than 5mm, keeping the rubber head dropper in an upright state, respectively dripping 5 drops of distilled water at different positions on the surface of the ultra-impermeable soil sample, dripping one drop each time, recording the time t i (i is 1-5) required for each drop of distilled water to completely permeate into the ultra-impermeable soil sample, and finally taking the arithmetic mean value ta of the infiltration time t1-t5 of the 5 drops of distilled water as the WDPT value of the soil to be tested, namely the water repellency.

According to the classification standard of the water repellency grade (table 1), through the test of a water dropping penetration time method, when the water repellency grade of the hydrophobic soil treated at a certain concentration can reach the water repellency grade of extreme water repellency by referring to the table 1, the concentration of the water repellency grade is suitable for the soil, and the obtained super impermeable soil sample is the optimal dilution concentration of the 'hard-loaded' impermeable material of the roadbed soil.

TABLE 1 Classification criteria for Water repellency ratings

Experiment two: one-dimensional earth pillar seepage test as 'hard-loaded' impervious material spraying concentration test

The experimental device adopts a glass column with the height of 80cm and the diameter of 15cm, the top opening and the bottom of the glass column are provided with a filter screen and a semicircular water collecting container, the bottom of the container is provided with a valve, the water supply device adopts a March's flask, and the experimental device is shown in figure 8.

Diluting the 'hard-loaded' impermeable materials with different concentrations (0.1%, 0.3%, 0.5%, 0.7%, 0.9%); uniformly mixing the diluted hard-loaded anti-seepage material with a roadbed soil sample to form super anti-seepage soil; after the mixing is finished, drying in an oven (with the set temperature of 105 ℃ for 24 hours); weighing the dried super impermeable soil sample, filling a soil column (the filling thickness is 15cm), and continuously filling roadbed undisturbed soil (the filling thickness is 45cm) on the super impermeable soil layer after the super impermeable soil layer is filled; before filling, the coefficients of the filled soil sample, such as particle size, particle size distribution, dry volume weight, porosity and the like, need to be determined; when filling, a layered filling method is adopted, each layer is filled with 5cm of soil, and the height of the soil column reaches the specified height of the soil column every time of filling, so that the porosity of the soil column is the same as that of the soil under the natural condition; and communicating the Mariotte bottle with the earth pillar container after the filling is finished, and preparing to collect the water quantity at the water outlet of the container. Opening a water supply valve to keep a water head constant (namely a constant water head); and starting to record data, recording a wetting peak once every half hour, and starting to discharge water from a water outlet at the bottom to record time.

By recording data of super-seepage-proof soil samples with different concentrations, if water flows out of a valve at the bottom of the glass column, the concentrations are not suitable for roadbed soil samples; if the wetting peak of the soil column stays at the boundary of the super impermeable soil layer and the undisturbed soil layer (namely, the position 15cm away from the bottom of the glass column) and no water flows out from the valve at the bottom of the glass column under the premise of continuously supplying water for one week, the concentration is the optimal dilution concentration of the 'hard-loaded' impermeable material of the roadbed soil.

According to the test result, as shown in fig. 9, when the concentration reaches 0.5% or more, the water repellency level can reach extreme water repellency, the higher the water repellency level is, the better the anti-seepage effect is, and the anti-seepage material can be applied to practical engineering after the appropriate spraying amount and concentration of the hard-loaded anti-seepage material are determined.

The construction method of the automatic anti-seepage access road structure comprises the following steps:

excavating the excavation roadbed foundation to the roadbed foundation elevation according to the survey design route, and leveling and compacting the filling roadbed foundation after removing soil skin containing weeds, tree roots and the like on the surface layer of the original ground according to the survey design route;

uniformly spraying the diluted 'hard-loaded' anti-seepage material on the surface layer of the roadbed foundation, naturally permeating the 'hard-loaded' anti-seepage material into soil below 5cm of the roadbed foundation, or turning over the surface soil after spraying according to the requirement, wherein the turning over thickness is controlled within 15cm, and compacting after the optimum water content of a roadbed foundation soil layer is reached after turning over, so as to form a foundation ultra-anti-seepage soil layer and prevent underground water from reversely permeating (upward permeating) into the roadbed;

after the base ultra-impermeable soil layer is naturally dried, roughening the surface layer, filling lime and compacting to form a lime soil layer; filling lime should be compacted by filling layer by layer;

paving brick slag or slag on the lime soil layer and compacting to form a brick slag or slag layer; similarly, the brick slag or slag layer should be filled and compacted layer by layer;

paving broken stones on the brick slag or slag layer and compacting to form a broken stone layer; paving a thin layer of clay on the surface of the crushed stone layer as required to form a surface thin soil layer;

after finishing the construction and detection of the rubble layer, carrying out roadbed side slope filling and finishing, spraying a 'hard-loaded' anti-seepage material on the roadbed surface and the roadbed side slope after finishing the finishing, naturally permeating the 'hard-loaded' anti-seepage material into the roadbed surface and the roadbed side slope soil to enable the anti-seepage material to naturally permeate a surface layer by 5cm to form a surface layer super anti-seepage soil layer and a side slope super anti-seepage soil layer, and naturally airing the roadbed (only by solar irradiation); and (4) compacting after drying, carrying out construction acceptance after naturally drying the roadbed surface and the roadbed slope soil layer, and completing construction without errors after detection to obtain the construction access road capable of automatically preventing seepage.

The engineering effect is as follows:

by adopting the automatic anti-seepage construction access road structure disclosed by the invention, the trial comparison and verification of the access road in the construction of a certain expressway in the south are shown in the following table 2:

TABLE 2 comparison of physical and chemical properties of different soil layers

From the experimental comparison of table 2, the following conclusions can be drawn:

the water content of the soil is visible, the water content of the soil layer in the roadbed with the automatic impermeable layer is 9-10% lower than that of the soil layer without the automatic impermeable layer, and the automatic impermeable layer effectively blocks rainwater from permeating into the roadbed;

according to the Ph value, the Ph value of the roadbed impermeable layer with the automatic impermeable layer is 7.1, while the Ph value of the roadbed impermeable layer without the automatic impermeable layer is 8.1, so that the impermeable layer effectively blocks the migration of lime in the roadbed soil range, prevents the lime from polluting surrounding soil and prevents the soil from being alkalized;

according to the content of calcium carbonate, the content of calcium carbonate in the roadbed impervious layer with the automatic impervious layer is lower and is close to a natural soil layer, the calcium carbonate is the main component of lime, the content of calcium carbonate reacts whether soil is invaded by the lime, and the reaction effect is the same as the ph value;

the application of the super-hydrophobic soil can avoid the roadbed soil from being corroded and softened by water, so that the compression modulus is improved to a certain extent, namely the compressive strength is improved to a certain extent compared with that of normal soil, and the super-hydrophobic soil is favorable for the sidewalk to bear upper construction load during construction.

The surface of the rain-laid roadbed without the 'hard-loaded' anti-seepage material is shown in figure 10, the surface of the rain-laid roadbed with the 'hard-loaded' anti-seepage material is shown in figure 11, the surface of the rain-laid roadbed without the 'hard-loaded' anti-seepage material is seriously accumulated with water and is muddy, in order to meet the requirement of construction vehicle traffic load, a concrete hardened roadbed is needed, the 'hard-loaded' anti-seepage material can effectively ensure the automatic anti-seepage effect of the temporary road, rainwater is discharged into two sides through the tiny slope of the roadbed, no water is accumulated on the road surface, no water is leaked on the roadbed, the roadbed strength can be ensured, the construction temporary road is not needed to be additionally hardened by concrete, only the original roadbed foundation is modified, the construction quality and efficiency are improved, and through field inspection, the pollution components in the roadbed and lime do not pollute peripheral soil, water sources and crops. The post-construction re-cultivation can be realized by only digging the roadbed, and is particularly suitable for ecological sensitive areas such as construction roads for crossing basic farmlands.

It will be readily appreciated by those skilled in the art that the various preferences described above may be freely combined, superimposed without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the present disclosure, but rather as the subject matter of any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure is intended to be covered by the present disclosure.

Claims

1. The utility model provides a be suitable for automatic prevention of seepage pavement structure of ecological sensitive area soft soil foundation which characterized in that mainly comprises road bed major structure and super prevention of seepage soil layer, wherein:

the roadbed main body structure comprises a lime soil layer laid on a soft soil roadbed, and a brick slag or slag layer and a gravel layer which are laid on the lime soil layer in a layered manner from bottom to top;

the ultra-impermeable soil layer is formed by spraying an impermeable material on roadbed soil, and the impermeable material is uniformly mixed with the roadbed soil and forms nano-scale porous particles with ultra-impermeable characteristics on the surface of soil particles after chemical reaction is completed; the super impermeable soil layer comprises a foundation super impermeable soil layer, a surface super impermeable soil layer and a side slope super impermeable soil layer, wherein the foundation super impermeable soil layer is laid at the foundation of the roadbed and below the lime soil layer; the surface layer ultra-impermeable soil layer is laid on the top surface of the roadbed above the gravel layer; the side slope super impervious soil layer is laid at the side slope of the roadbed; and the number of the first and second electrodes,

the foundation ultra-impermeable soil layer, the surface ultra-impermeable soil layer and the side slope ultra-impermeable soil layer are arranged around the cross section of the roadbed main body structure to form a closed-loop ultra-impermeable structure.

2. The automatic anti-seepage access structure of claim 1, wherein:

the foundation super impervious soil layer is formed by plowing the roadbed foundation surface soil sprayed with impervious materials to be 15cm thick and then compacting, and the thickness is 10 cm.

3. The automatic anti-seepage access structure of claim 1, wherein:

the surface layer super impermeable soil layer and the side slope super impermeable soil layer are formed by spraying impermeable materials and downwards permeating 2-5cm, and the thickness is 2-5 cm.

4. The automatic anti-seepage access structure of claim 1, wherein:

the side slope super impermeable soil layer is formed by spraying an impermeable material on the side slope filling layer and naturally permeating the impermeable material;

preferably, the filling thickness of the side slope filling layer is 20-50cm, and the impermeable material permeates 2-5cm on the side slope filling layer.

5. The automatic anti-seepage access structure of claim 1, wherein:

the surface thin soil layer is laid above the gravel layer, and the surface super impermeable soil layer is formed by spraying an impermeable material on the surface thin soil layer and naturally permeating the impermeable material;

preferably, the thickness of the surface thin soil layer is 2-5 cm.

6. The automatic anti-seepage access structure of claim 1, wherein:

the anti-seepage material is a 'hard-filled' anti-seepage material and is prepared from the following raw materials: organic compound, catalyst, water; wherein the fixed ratio of the organic compound to the catalyst is 10: 1, organic compound and catalyst account for 2-80% of total weight of the barrier material, and water accounts for 98-20% of total weight of the 'hard-loaded' barrier material.

7. The automatic anti-seepage access structure of claim 6, wherein:

the organic composition is hydrogen-containing siloxane polymer, and the structural formula is as follows:

8. The automatic anti-seepage access structure of claim 6, wherein:

the concentration of the hard-charged anti-seepage material is 0.5-10%, 4-7kg of the hard-charged anti-seepage material is sprayed on every square meter of roadbed soil, and the effective organic composition component of the hard-charged anti-seepage material contained in every square meter of roadbed soil is not less than 100 g.

9. The automatic anti-seepage access structure of claim 6, wherein:

10. The construction method of the automatic seepage-proofing access road structure according to any one of claims 1 to 9 is characterized by comprising the following steps:

firstly, excavating an excavation roadbed foundation to a designed elevation, and carrying out leveling and compaction treatment after the filling roadbed foundation is buried to the designed elevation;

step two, uniformly spraying the diluted 'hard-loaded' impermeable material on the surface layer of the roadbed foundation, ploughing the surface soil after spraying, controlling the ploughing thickness within 15cm, and compacting after the ploughed roadbed foundation soil layer reaches the optimal water content to form a base ultra-impermeable soil layer;

step five, paving broken stones on the brick slag or slag layer and compacting to form a broken stone layer;

and step eight, spraying a 'hard-loaded' impermeable material on the surface thin soil layer and the side slope filling layer, naturally permeating the 'hard-loaded' impermeable material into the roadbed surface and the roadbed side slope soil body, and naturally airing to form a surface layer ultra-impermeable soil layer and a side slope ultra-impermeable soil layer.