Red-bed mudstone bionic super-hydrophobic anti-disintegration roadbed structure

Abstract

The present application relates to the field of geotechnical engineering in civil engineering industry, and particularly relates to a kind of red layer mudstone bionic super-hydrophobic disintegration-resistant roadbed structure.S1, raw materials are stirred to prepare bionic hydrophobic modified red layer mudstone filling, S2, the embankment is filled and reinforced in the first layer, the second layer, the third layer, and covered with geomembrane to obtain a hydrophobic roadbed, S3, the embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction, self-heating drying, a super-hydrophobic structure red layer mudstone roadbed is obtained.The bionic super-hydrophobic disintegration-resistant roadbed structure of the red layer mudstone designed in the present application can better inhibit the infiltration of capillary water into the red layer mudstone compared to the traditional process, thereby preventing the red layer mudstone from absorbing water, softening and disintegrating, and has outstanding advantages, and is suitable for industrial application.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering in the civil engineering industry, and particularly relates to a red-bed mudstone bionic super-hydrophobic disintegration-resistant roadbed structure. BACKGROUND

[0002] Red-bed is composed of various rock types, and the rocks differ greatly in chemical composition, clay mineral content, rock debris content and water-physical properties. The various rock types have different diagenetic and weathering experiences. The mineral composition of the red-bed is generally quartz, feldspar, calcite, kaolinite, montmorillonite and illite, and the chemical composition is mainly silicon dioxide, ferric oxide and aluminum oxide, calcium oxide and potassium oxide, among which the contents of silicon dioxide, ferric oxide and aluminum oxide are relatively large. The clay minerals with a particle size less than 0.002 mm are analyzed by using a ray diffraction method, and the clay minerals of argillaceous siltstone and mudstone are mainly illite, and a small amount of kaolinite, chlorite and montmorillonite. Generally, the clay mineral content of the red-bed mudstone is greater than 10%. The chemical composition of the red-bed soft rock sample is analyzed by using an atomic absorption method, and the main chemical compositions are silicon dioxide, ferric oxide and aluminum oxide, and the sum of the three is more than 73%, the loss on ignition is 6%-11%, and the content of the easily soluble salt is less than 2%. The differences in the composition and content will directly lead to the differences in the engineering properties of the red-bed material, such as softening, disintegration and argillation.

[0003] The main diseases of the red-bed soft rock embankment filling engineering are as follows:

[0004] 1. The embankment is filled on the slope in the red-bed area, or the semi-filled semi-excavated embankment, and the embankment is easy to slide along the slope surface to form the embankment landslide because the slope surface is often the channel of the surface water activity.

[0005] 2. The surface is loose, the dust is raised, and the bearing capacity is insufficient. The water loss is an important reason for the disintegration and sandification of the red-bed soft rock, and the water loss process is a complex process of mineral separation and condensation of the soil. The loose surface and insufficient bearing capacity of the roadbed are the results of the water absorption, swelling, water loss and disintegration of the red-bed soft rock.

[0006] 3. The roadbed slope is eroded and the sand production is caused. The raindrop impacts the slope surface to make the clay particles in the red-bed mudstone separate from the soil mass, and the clay particles flow away from the slope surface through the shallow surface runoff, and only the heavy and stable coarse sand is left on the slope surface, so that the rainwater infiltrates more quickly, and the vegetation roots are easily washed out of the slope surface in the sand. When the runoff ditch is gradually deepened, the soil on both sides of the slope runoff ditch is saturated due to the water infiltration, the strength is reduced, and the slope surface collapses.

[0007] 4. Problems that are prone to occur during construction. In the actual filling process, the compaction coefficient often decreases due to the difficulty in controlling the water content of the red mudstone soil. Some projects have adopted the method of strong tamping reinforcement to deal with the red mudstone soil with a high water content. During filling, the pore water often cannot dissipate quickly, the soil body bulges, and forms "plasticine". Some projects use spaced and perforated steel pipes to form seepage wells in the soil body, improve the permeability of the soil body, and use strong vibration followed by strong tamping to accelerate consolidation, achieving good results. Alternatively, chemical improvement measures are taken to improve the compaction performance and bearing capacity of the roadbed.

[0008] 5. The red layer soft rock roadbed slope is not compacted, and is affected by rain erosion and the dry-wet cycle changes in the atmospheric environment, resulting in shoulder collapse and cracking.

[0009] In the process of preparing superhydrophobic materials, scholars have continuously drawn inspiration from natural organisms, with the lotus leaf, known for its "untainted" nature, being the most representative. Water droplets on the lotus leaf's surface have a contact angle greater than 150° and roll easily, removing dirt from the leaf, giving it a self-cleaning property known as the "lotus effect." The lotus leaf surface possesses three characteristics: a low-surface-energy waxy / film-like chemical surface; a micron-scale papillary roughness structure; and a nanometer-scale ciliary roughness structure. This multi-layered micro-nano composite structure is the key to the lotus effect. Hydrophobic modification of red mudstone fillers based on the biomimetic principle of the "lotus effect" can specifically address its water disintegration problem. In order to make full use of red mudstone as roadbed filler, a new bionic hydrophobic roadbed structure was proposed. The hydrophobic modified soil layer and geotechnical anti-seepage materials were rationally used to carry out waterproof covering treatment on the bottom, top and slope of the red mudstone embankment to prevent the collapse of the red soft rock filler caused by the infiltration of surface water and groundwater, and maintain the stability of the roadbed. Summary of the Invention

[0010] The present invention aims to provide a method for inhibiting the disintegration of water-sensitive red-bed mudstone when it encounters water. With the improvement of relevant processes and raw materials, the present invention has a significant gain effect on improving the performance of water-sensitive red-bed mudstone.

[0011] The principles of this method are as follows: 1. The micron-scale rough structure is composed of octadecylamine needles intercalated within the clay minerals of the red mudstone and breaking through the soil surface; 2. The nanoscale rough structure is composed of nano-silica particles deposited on the surface of the red mudstone and the octadecylamine needles; 3. Propyltrimethoxysilane and potassium methyl silicate form a biomimetic polymer hydrophobic film on the surface of the micro-nanostructure, similar to the membrane-like material on the surface of a lotus leaf. This film has extremely low surface free energy and can block the penetration of water.

[0012] The specific implementation scheme of a red mudstone bionic super-hydrophobic collapse-resistant roadbed structure according to the present invention is as follows:

[0013] S1. Stir the raw materials to prepare a biomimetic hydrophobic modified red-bed mud filler

[0014] Stir 1-3% octadecyl primary amine, 0.5-1.5% potassium methyl silicate, 0.5-1.5% glass fiber, 0.5-1.5% propyl trimethoxysilane, and 10-30% water with the pre-disintegrated red-bed mud evenly;

[0015] The diameter of the glass fiber is 20-40 nm, and the length is 10-30 um;

[0016] Dry and crush the mixed and stirred red-bed mud to obtain a hydrophobic modified red-bed mud filler. The surface filler has a roughness of 2-8 um;

[0017] S2. Fill and reinforce the embankment with the first, second, and third layers, and cover it with a geomembrane to obtain a hydrophobic embankment

[0018] Fill the hydrophobic modified red-bed mud filler on the embankment base to obtain the first layer, with a filling thickness of about 10-15 cm, and perform compaction treatment. Before filling the first layer, cover the base with a two-cloth-one-membrane composite geomembrane;

[0019] Fill a layer of ordinary unmodified red-bed mud on the surface of the compacted embankment to obtain the second layer. The filling thickness can be set according to actual needs. After filling, perform compaction treatment;

[0020] Fill a layer of hydrophobic modified red-bed mud filler on the surface of the second layer of ordinary red-bed mud to obtain the third layer, with a filling thickness of about 10-15 cm;

[0021] Reinforce the three-layer filling with rectangular glass fiber geogrids as the reinforcing material. The geogrids have a length of 3-5 m, a width of 0.5-1.5 m, and a height of 0.1-0.3 m;

[0022] Lay the two-cloth-one-membrane composite geomembrane on the surface of the third layer to obtain a hydrophobic embankment;

[0023] S3. Fill the embankment slope and spray the prepared hydrophobic modified composite solution, and then compact and self-heat dry to obtain a super-hydrophobic structure red-bed mud embankment

[0024] Mix the red-bed mud soil with 1-3% octadecyl primary amine powder evenly and fill it on the surface of the slope with a thickness of 10-30 cm;

[0025] Stir the solute concentration of 2-6% nanometer silicon dioxide, 2-5% potassium methyl silicate, 2-5% propyl trimethoxysilane, and 0.5-1.5% glass fiber, and the rest is water to obtain a hydrophobic modified composite solution;

[0026] The diameter of the glass fiber is 20-40 nm, and the length is 10-30 um.

[0027] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mudstone to obtain a hydrophobic roadbed slope, and the spraying amount is 1-3 kg / m 2 ;

[0028] The roadbed and the roadbed slope are compacted, and after natural drying, a red-bed mudstone roadbed with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0029] Advantages:

[0030] (1) The hydrophobic film is colorless, odorless, harmless and durable, and can prevent water from penetrating while reinforcing the soil body;

[0031] (2) The hydrophobic film also has air permeability, so water cannot enter the roadbed from the outside, but the water in the roadbed structure can be discharged from the surface of the film;

[0032] (3) The static contact angle of the water droplets on the superhydrophobic biomimetic structure is more than 150°, and the rolling angle is less than 8°, so rainwater can easily slide off the slope surface;

[0033] (4) The biomimetic hydrophobic roadbed structure can greatly reduce the slope peeling caused by rainfall and weathering, prevent the disintegration of red-bed soft rock fillers caused by surface water and groundwater infiltration, and effectively inhibit groundwater pollution;

[0034] (5) This structure not only saves energy and improves economic efficiency, but also helps to efficiently use red-bed soft rock roadbed fillers and improve the long-term performance of red-bed soft rock roadbeds. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a preparation flowchart of a red-bed mudstone biomimetic superhydrophobic anti-disintegration roadbed structure;

[0036] Figure 2 It is an electron microscope scanning diagram of a biomimetic hydrophobic red-bed mudstone slope surface micro-nano structure; DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0038] The present application provides a red-bed mudstone biomimetic superhydrophobic anti-disintegration roadbed structure, which mainly comprises the following steps:

[0039] S1. Stir the raw materials to prepare a biomimetic hydrophobic modified red-bed mudstone filler;

[0040] S2. The embankment is filled and reinforced in the first layer, the second layer and the third layer, and a geomembrane is covered to obtain a hydrophobic embankment;

[0041] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, an ultrahydrophobic structure red-bed mudstone embankment is obtained;

[0042] As an embodiment, the following contents of the embodiment of the present application give several specific examples of the foregoing red-bed mudstone bionic ultrahydrophobic anti-disintegration embankment structure, which are compared and explained by way of example 1, example 2, example 3 and example 1-7.

[0043] Example 1:

[0044] S1. The raw materials are stirred to prepare a bionic hydrophobic modified red-bed mudstone filler

[0045] 1% octadecyl primary amine, 0.5% potassium methyl silicate, 0.5% glass fiber, 0.5% propyl trimethoxysilane and about 10% water are stirred uniformly with the pre-disintegrated red-bed mudstone;

[0046] The diameter of the glass fiber is 20 nm, and the length is 10 um;

[0047] The mixed and stirred red-bed mudstone is dried and broken to obtain a hydrophobic modified red-bed mudstone filler, and the roughness of the surface filler is 2 um;

[0048] S2. The embankment is filled and reinforced in the first layer, the second layer and the third layer, and a geomembrane is covered to obtain a hydrophobic embankment

[0049] The hydrophobic modified red-bed mudstone filler is filled in the bottom layer of the embankment to obtain the first layer, and the filling thickness is about 10 cm, and compaction treatment is performed, wherein a two-cloth-one-membrane composite geomembrane is covered on the bottom before the first layer is filled;

[0050] A layer of ordinary unmodified red-bed mudstone is filled on the surface of the compacted embankment to obtain the second layer, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0051] A layer of hydrophobic modified red-bed mudstone filler is filled on the surface of the second layer of ordinary red-bed mudstone to obtain the third layer, and the filling thickness is about 10 cm;

[0052] The three layers of filling are reinforced, and the reinforcing material is a rectangular glass fiber geogrid with a length of 3 m, a width of 0.5 m and a height of 0.1 m;

[0053] The two-cloth-one-membrane composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic embankment;

[0054] S3. Fill the embankment slope with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, obtain the super-hydrophobic structure red-bed mudstone roadbed

[0055] Mix the red-bed mudstone soil body with 1%-3% octadecyl primary amine powder uniformly and fill it on the surface of the slope with a thickness of 10 cm;

[0056] Stir and mix solute concentration 2% nano-silicon dioxide, 2% methyl potassium silicate, 2% propyl trimethoxysilane, 0.5% glass fiber, and the rest water to obtain a hydrophobic modified composite solution;

[0057] The diameter of the glass fiber is 20 nm, and the length is 10 um;

[0058] Spray the hydrophobic modified composite solution on the surface of the red-bed mudstone to obtain a hydrophobic roadbed slope, and the spraying amount is 1 kg / m 2 ;

[0059] Compaction treatment is performed on the roadbed and roadbed slope, and after natural drying, a red-bed mudstone roadbed with a hydrophobic "lotus leaf" micro-nano structure is obtained.

[0060] Example 2:

[0061] S1. Stir the raw materials to prepare a biomimetic hydrophobic modified red-bed mudstone filler

[0062] Stir 3% octadecyl primary amine, 1.5% methyl potassium silicate, 1.5% glass fiber, 1.5% propyl trimethoxysilane, and about 30% water with the pre-disintegrated red-bed mudstone uniformly;

[0063] The diameter of the glass fiber is 40 nm, and the length is 30 um;

[0064] Dry and crush the mixed and stirred red-bed mudstone to obtain a hydrophobic modified red-bed mudstone filler, and the roughness of the surface filler is 8 um;

[0065] S2. Fill and reinforce the embankment in the first layer, the second layer, and the third layer, and cover the geomembrane to obtain a hydrophobic roadbed

[0066] Fill the hydrophobic modified red-bed mudstone filler to obtain the first layer, and the filling thickness is about 15 cm, and compaction treatment is performed, wherein a layer of two cloth and one membrane composite geomembrane is covered on the base before filling the first layer;

[0067] Fill another layer of ordinary unmodified red-bed mudstone on the surface of the compacted roadbed to obtain the second layer, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0068] A third layer is obtained by filling a layer of hydrophobic modified red layer mudstone filler on the surface of the second layer of common red layer mudstone, and the filling thickness is about 15 cm;

[0069] The three layers of filling are reinforced, and the reinforcing material is rectangular glass fiber geogrid, the length of the geogrid is 5 m, the width is 1.5 m, and the height is 0.3 m;

[0070] The two-cloth-one-film composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic subgrade;

[0071] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, a super-hydrophobic structure red layer mudstone subgrade is obtained

[0072] The red layer mudstone soil body is uniformly mixed with 3% octadecyl primary amine powder and filled on the surface of the slope, and the thickness is 30 cm;

[0073] The solute concentration is 6% nanometer silicon dioxide, 5% methyl potassium silicate, 5% propyl trimethoxysilane, 01.5% glass fiber, and the rest is water, which is stirred and mixed to obtain a hydrophobic modified composite solution;

[0074] The diameter of the glass fiber is 40 nm, and the length is 30 um;

[0075] The hydrophobic modified composite solution is sprayed on the surface of the red layer mudstone to obtain a hydrophobic subgrade slope, and the spraying amount is 3 kg / m 2 ;

[0076] The subgrade and the subgrade slope are compacted, and after natural drying, a red layer mudstone subgrade with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0077] Example 3:

[0078] S1. The raw materials are stirred to prepare a biomimetic hydrophobic modified red layer mudstone filler

[0079] 2% octadecyl primary amine, 1% methyl potassium silicate, 1% glass fiber, 1% propyl trimethoxysilane, and about 20% water are stirred with the pre-disintegrated red layer mudstone;

[0080] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0081] The mixed and stirred red layer mudstone is dried and crushed to obtain a hydrophobic modified red layer mudstone filler, and the roughness of the surface filler is 6 um;

[0082] S2. The embankment is filled and reinforced in the first layer, the second layer, and the third layer, and the geomembrane is covered to obtain a hydrophobic subgrade

[0083] The hydrophobic modified red-bed mud filler is filled on the roadbed bottom layer to obtain a first layer, and the filling thickness is about 12 cm, and compaction treatment is performed, wherein a two-cloth-one-film composite geomembrane is first covered on the bottom before the first layer is filled;

[0084] A second layer of ordinary unmodified red-bed mud is filled on the surface of the compacted roadbed, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0085] A third layer of hydrophobic modified red-bed mud filler is filled on the surface of the second layer of ordinary red-bed mud, and the filling thickness is about 12 cm;

[0086] The three layers of filling are subjected to reinforcement treatment, and the reinforcement material is a rectangular glass fiber geogrid with a length of 4 m, a width of 1 m and a height of 0.2 m;

[0087] The two-cloth-one-film composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic roadbed;

[0088] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, a super-hydrophobic structure red-bed mud roadbed is obtained

[0089] The red-bed mud soil body is uniformly mixed with 2% octadecyl primary amine powder and filled on the surface of the slope with a thickness of 20 cm;

[0090] The solute concentration of 4% nanometer silicon dioxide, 4% methyl potassium silicate, 4% propyl trimethoxysilane, 1% glass fiber, and the rest is water is stirred and mixed to obtain a hydrophobic modified composite solution;

[0091] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0092] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mud to obtain a hydrophobic roadbed slope, and the spraying amount is 2 kg / m 2 ;

[0093] The roadbed and the roadbed slope are subjected to compaction treatment, and after natural drying, a red-bed mud roadbed with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0094] Comparative Example 1:

[0095] S1. The raw materials are stirred to prepare a biomimetic hydrophobic modified red-bed mud filler

[0096] 2% octadecyl primary amine, 1% methyl potassium silicate, 1% propyl trimethoxysilane, and about 20% water are stirred and mixed with the pre-disintegrated red-bed mud;

[0097] The mixed and stirred red-bed mud is dried and crushed to obtain a hydrophobic modified red-bed mud filler, and the roughness of the surface filler is 6 um;

[0098] S2. The embankment is subjected to first layer, second layer, third layer filling and reinforcement treatment, and a geomembrane is covered to obtain a hydrophobic embankment

[0099] The hydrophobic modified red-bed mud filler is filled in the bottom layer of the embankment to obtain the first layer, and the filling thickness is about 12 cm, and compaction treatment is performed, wherein a two-cloth-one-membrane composite geomembrane is first covered on the bottom before the first layer is filled;

[0100] A layer of ordinary unmodified red-bed mud is filled on the surface of the compacted embankment to obtain the second layer, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0101] A layer of hydrophobic modified red-bed mud filler is filled on the surface of the ordinary red-bed mud of the second layer to obtain the third layer, and the filling thickness is about 12 cm;

[0102] Reinforcement treatment is performed on the three-layer filling, and the reinforcement material is a rectangular glass fiber geogrid with a length of 4 m, a width of 1 m, and a height of 0.2 m;

[0103] The two-cloth-one-membrane composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic embankment;

[0104] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction, self-heating drying, a super-hydrophobic structure red-bed mud embankment is obtained

[0105] The red-bed mud soil body is uniformly mixed with 2% octadecyl primary amine powder and filled on the surface of the slope with a thickness of 20 cm;

[0106] The solute concentration of 4% nano-silicon dioxide, 4% methyl potassium silicate, 4% propyl trimethoxysilane, and the rest is water is stirred and mixed to obtain a hydrophobic modified composite solution;

[0107] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mud to obtain a hydrophobic embankment slope, and the spraying amount is 2 kg / m 2 ;

[0108] The embankment and embankment slope are subjected to compaction treatment, and after natural drying, a red-bed mud embankment with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0109] Comparative Example 2:

[0110] S1. The raw materials are stirred to prepare a biomimetic hydrophobic modified red-bed mud filler

[0111] 2% octadecyl primary amine, 1% methyl potassium silicate, 1% glass fiber, 1% propyl trimethoxysilane, and about 20% water are stirred with the pre-disintegrated red-bed mud;

[0112] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0113] The mixed and stirred red-bed mudstone is dried and broken to obtain a hydrophobic modified red-bed mudstone filler, and the surface filler has a roughness of 6 um;

[0114] S2. The embankment is subjected to first layer, second layer and reinforcement treatment, and a geomembrane is covered to obtain a hydrophobic embankment

[0115] The ordinary unmodified red-bed mudstone is filled into the embankment to obtain the first layer, and the filling thickness is about 10 cm. After filling, compaction treatment is performed;

[0116] A layer of hydrophobic modified red-bed mudstone filler is filled on the surface of the first layer of ordinary red-bed mudstone to obtain the second layer, and the filling thickness is about 4 cm;

[0117] The second layer filling is subjected to reinforcement treatment, and the reinforcement material is a rectangular glass fiber geogrid with a length of 4 m, a width of 1 m and a height of 0.2 m;

[0118] The two-cloth-one-membrane composite geomembrane is laid on the surface of the second layer to obtain a hydrophobic embankment;

[0119] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, a super-hydrophobic structure red-bed mudstone embankment is obtained

[0120] The red-bed mudstone soil body is mixed with 2% octadecyl primary amine powder and filled on the surface of the slope with a thickness of 20 cm;

[0121] The solute concentration is 4% nanometer silicon dioxide, 4% methyl potassium silicate, 4% propyl trimethoxysilane, 1% glass fiber, and the rest is water. Stirring and mixing obtain a hydrophobic modified composite solution;

[0122] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0123] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mudstone to obtain a hydrophobic embankment slope, and the spraying amount is 2 kg / m 2 ;

[0124] The embankment and embankment slope are subjected to compaction treatment, and after natural drying, a red-bed mudstone embankment with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0125] Comparative Example 3:

[0126] S1. The raw materials are stirred to prepare a biomimetic hydrophobic modified red-bed mudstone filler

[0127] 2% octadecyl primary amine, 1% potassium methyl silicate, 1% glass fiber, 1% propyl trimethoxysilane, 20% water or so are stirred with the red-bed mudstone after pre-disintegration;

[0128] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0129] The mixed and stirred red-bed mudstone is dried and broken to obtain a hydrophobic modified red-bed mudstone filler, and the roughness of the surface filler is 6 um;

[0130] S2. The embankment is filled with a first layer, a second layer, and a reinforcing treatment, and a geomembrane is covered to obtain a hydrophobic embankment

[0131] The hydrophobic modified red-bed mudstone filler is filled on the bottom layer of the embankment to obtain the first layer, and the filling thickness is about 12 cm, and compaction treatment is performed, wherein a two-cloth-one-membrane composite geomembrane is covered on the bottom layer before the first layer is filled;

[0132] A second layer of ordinary unmodified red-bed mudstone is filled on the surface of the compacted embankment, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0133] The second layer filling is reinforced with a rectangular glass fiber geogrid, and the length of the geogrid is 4 m, the width is 1 m, and the height is 0.2 m;

[0134] The two-cloth-one-membrane composite geomembrane is laid on the surface of the second layer to obtain a hydrophobic embankment;

[0135] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, a super-hydrophobic structure red-bed mudstone embankment is obtained

[0136] The red-bed mudstone soil body is uniformly mixed with 2% octadecyl primary amine powder and filled on the surface of the slope with a thickness of 20 cm;

[0137] The solute concentration of 4% nanometer silicon dioxide, 4% potassium methyl silicate, 4% propyl trimethoxysilane, and 1% glass fiber, and the rest is water, is stirred and mixed to obtain a hydrophobic modified composite solution;

[0138] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0139] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mudstone to obtain a hydrophobic embankment slope, and the spraying amount is 2 kg / m 2 ;

[0140] The embankment and embankment slope are compacted, and after natural drying, a red-bed mudstone embankment with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0141] Comparative Example 4:

[0142] S1. Stirring the raw materials to prepare biomimetic hydrophobic modified red mudstone filler

[0143] 2% octadecyl primary amine, 1% potassium methyl silicate, 1% glass fiber, 1% propyltrimethoxysilane, and about 20% water were mixed evenly with the pre-disintegrated red mudstone;

[0144] The diameter of the glass fiber is 30nm and the length is 20um;

[0145] The mixed and stirred red bed mudstone is dried and crushed to obtain a hydrophobically modified red bed mudstone filler, wherein the surface roughness of the filler is 6 μm;

[0146] S2. Fill and reinforce the embankment with the first, second and third layers, and cover with geomembrane to obtain a hydrophobic roadbed.

[0147] The hydrophobic modified red mudstone filler is used to fill the roadbed layer to obtain the first layer, with a filling thickness of about 12 cm, and is compacted. Before the first layer is filled, the base is covered with a layer of two-cloth-one-film composite geomembrane;

[0148] A layer of ordinary unmodified red mudstone is filled on the compacted roadbed surface to obtain the second layer. The filling thickness can be set according to actual work needs, and compaction is performed after filling.

[0149] A layer of hydrophobically modified red mudstone filler is added to the surface of the second layer of ordinary red mudstone to obtain the third layer, with a filling thickness of about 12 cm;

[0150] Laying a two-cloth-one-film composite geomembrane on the surface of the third layer to obtain a hydrophobic roadbed;

[0151] S3. Fill the embankment slope and spray the prepared hydrophobic modified composite solution, compact and autothermally dry to obtain a super-hydrophobic red mudstone roadbed

[0152] The red mudstone soil was mixed with 2% octadecyl primary amine powder and evenly filled on the slope surface with a thickness of 20 cm.

[0153] A hydrophobically modified composite solution is prepared by mixing a solute concentration of 4% nano-silica, 4% potassium methyl silicate, 4% propyltrimethoxysilane, 1% glass fiber, and the remainder being water.

[0154] The diameter of the glass fiber is 30nm and the length is 20um;

[0155] The hydrophobic modified composite solution was sprayed on the surface of the red mudstone to obtain a hydrophobic roadbed slope. The spraying amount was 2kg / m 2 ;

[0156] The roadbed and roadbed slope are compacted, and after natural drying, a red-bed mudstone roadbed with a hydrophobic "lotus leaf" micro-nano structure is obtained.

[0157] Comparative Example 5:

[0158] S1. Stir the raw materials to prepare a biomimetic hydrophobic modified red-bed mudstone filler

[0159] Stir 2% octadecyl primary amine, 1% potassium methyl silicate, 1% glass fiber, 1% propyl trimethoxysilane, and about 20% water with the pre-disintegrated red-bed mudstone;

[0160] The diameter of the glass fiber is 30 nm, and the length is 20 um.

[0161] The mixed and stirred red-bed mudstone is dried and crushed to obtain a hydrophobic modified red-bed mudstone filler. The surface roughness of the filler is 6 um.

[0162] S2. First layer, second layer, and third layer filling and reinforcement treatment are performed on the embankment, and a geomembrane is covered to obtain a hydrophobic roadbed

[0163] The hydrophobic modified red-bed mudstone filler is filled in the bottom layer of the roadbed to obtain the first layer, and the filling thickness is about 12 cm. The first layer is compacted, and a two-cloth-one-membrane composite geomembrane is covered on the bottom before filling.

[0164] A layer of ordinary unmodified red-bed mudstone is filled on the surface of the compacted roadbed to obtain the second layer. The filling thickness can be set according to actual needs, and the second layer is compacted after filling.

[0165] A layer of hydrophobic modified red-bed mudstone filler is filled on the surface of the second layer of ordinary red-bed mudstone to obtain the third layer, and the filling thickness is about 12 cm.

[0166] The three layers of filling are reinforced with rectangular glass fiber geogrids. The length of the geogrid is 4 m, the width is 1 m, and the height is 0.2 m.

[0167] The two-cloth-one-membrane composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic roadbed.

[0168] Comparative Example 6:

[0169] S1. Stir the raw materials to prepare a biomimetic hydrophobic modified red-bed mudstone filler

[0170] Stir 2% octadecyl primary amine, 1% potassium methyl silicate, 1% glass fiber, 1% propyl trimethoxysilane, and about 20% water with the pre-disintegrated red-bed mudstone;

[0171] The diameter of the glass fiber is 30 nm, and the length is 20 um.

[0172] The mixed and stirred red-bed mudstone is dried and broken to obtain a hydrophobic modified red-bed mudstone filler, and the roughness of the surface filler is 6 um;

[0173] S2. The embankment is filled and reinforced in a first layer, a second layer, and a third layer to obtain a hydrophobic embankment

[0174] The hydrophobic modified red-bed mudstone filler is filled in the bottom layer of the embankment to obtain the first layer, and the filling thickness is about 12 cm, and compaction treatment is performed, wherein a two-cloth-one-film composite geomembrane is first covered on the bottom before the first layer is filled;

[0175] A layer of ordinary unmodified red-bed mudstone is filled on the surface of the compacted embankment to obtain the second layer, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0176] A layer of hydrophobic modified red-bed mudstone filler is filled on the surface of the ordinary red-bed mudstone of the second layer to obtain the third layer, and the filling thickness is about 12 cm;

[0177] The three layers of filling are subjected to reinforcement treatment, and the reinforcement material is a rectangular glass fiber geogrid with a length of 4 m, a width of 1 m, and a height of 0.2 m;

[0178] The two-cloth-one-film composite geomembrane is laid on the surface of the third layer to obtain a hydrophobic embankment;

[0179] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction, self-heating drying, a super-hydrophobic structure red-bed mudstone embankment is obtained

[0180] The red-bed mudstone soil body is uniformly mixed with 2% octadecyl primary amine powder and filled on the surface of the slope with a thickness of 20 cm;

[0181] The embankment and the embankment slope are subjected to compaction treatment, and after natural drying, a red-bed mudstone embankment with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0182] Comparative Example 7:

[0183] S1. The raw materials are stirred to prepare a biomimetic hydrophobic modified red-bed mudstone filler

[0184] 2% octadecyl primary amine, 1% potassium methyl silicate, 1% glass fiber, 1% propyl trimethoxysilane, and about 20% water are uniformly stirred with the pre-disintegrated red-bed mudstone;

[0185] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0186] The mixed and stirred red-bed mudstone is dried and broken to obtain a hydrophobic modified red-bed mudstone filler, and the roughness of the surface filler is 6 um;

[0187] S2. The embankment is filled with a first layer, a second layer, a third layer, and is reinforced, and a geomembrane is covered to obtain a hydrophobic embankment

[0188] The hydrophobic modified red-bed mud filler is filled in the bottom layer of the embankment to obtain the first layer, and the filling thickness is about 12 cm, and compaction treatment is performed, wherein a two-cloth-one-membrane composite geomembrane is first covered on the bottom before the first layer is filled;

[0189] A layer of ordinary unmodified red-bed mud is filled on the surface of the compacted embankment to obtain the second layer, and the filling thickness can be set according to actual needs, and compaction treatment is performed after filling;

[0190] A layer of hydrophobic modified red-bed mud filler is filled on the surface of the ordinary red-bed mud of the second layer to obtain the third layer, and the filling thickness is about 12 cm;

[0191] The three layers of filling are reinforced, and the reinforcing material is a rectangular glass fiber geogrid, the length of the geogrid is 4 m, the width is 1 m, and the height is 0.2 m;

[0192] The two-cloth-one-membrane composite geomembrane is laid on the surface of the third layer to obtain the hydrophobic embankment;

[0193] S3. The embankment slope is filled and sprayed with the prepared hydrophobic modified composite solution, and after compaction and self-heating drying, a super-hydrophobic structure red-bed mud embankment is obtained

[0194] The red-bed mud soil is filled on the surface of the slope, and the thickness is 20 cm;

[0195] The solute concentration of 4% nanometer silicon dioxide, 4% methyl potassium silicate, 4% propyl trimethoxysilane, 1% glass fiber, and the rest is water is stirred and mixed to obtain a hydrophobic modified composite solution;

[0196] The diameter of the glass fiber is 30 nm, and the length is 20 um;

[0197] The hydrophobic modified composite solution is sprayed on the surface of the red-bed mud to obtain a hydrophobic embankment slope, and the spraying amount is 2 kg / m 2 ;

[0198] The embankment and the embankment slope are compacted, and after natural drying, a red-bed mud embankment with a hydrophobic lotus-leaf-like micro-nano structure is obtained.

[0199] Table 1

[0200] Static contact angle:

[0201] Contact angle generally refers to the wetting angle. The wetting angle refers to the angle between the solid-liquid interface, the liquid interior, and the gas-liquid interface at the interface of solid, liquid, and gas. It is also called the contact angle. The static contact angle test method can refer to the national standard GBT30447 2013.

[0202] Disintegration test:

[0203] The modified red mudstone was pressed into blocks and the aqueous solution was sprayed on the surface to observe whether the blocks collapsed within 120 hours.

[0204] Rebound modulus:

[0205] In pavement design, the rebound modulus is used as an indicator of the compressive strength of the subgrade. It indicates the subgrade's ability to resist vertical deformation under vertical load during its elastic deformation phase. If the vertical load is constant, a larger rebound modulus results in smaller vertical displacement. If the vertical displacement is constant, a larger rebound modulus indicates a greater ability of the subgrade to withstand external loads. For relevant standards, refer to JTJ 034-2000.

[0206]

[0207] Comparative Examples 1-7 in Table 1 were obtained by adjusting the experimental process or experimental parameters within the experimental parameters of Example 3. From the comparison of the experimental data of Examples 1, 2, and 3 in Table 1 and Comparative Example 1, it can be found that after removing the glass fiber from the raw material, the overall change in the relevant data is not very obvious. However, glass fiber is necessary to maintain the long-term effectiveness of the hydrophobicity of the roadbed, and it can increase the stability of the hydrophobic structure;

[0208] From the comparison of the experimental data of Examples 1, 2, and 3 and Comparative Example 2 in Table 1, it can be found that when the first layer of modified red bed mud is not filled, the static contact angle decreases significantly, collapse occurs after 120 hours, and the rebound modulus decreases. This shows that after the red bed mud is removed from the bottom layer, the bottom layer cannot prevent the reverse infiltration of water vapor, which will cause the roadbed to collapse from bottom to top, and ultimately cause a decrease in the rebound modulus.

[0209] From the comparison of the experimental data of Examples 1, 2, and 3 and Comparative Example 3 in Table 1, it can be found that when the third layer of modified red bed mud is not filled, the static contact angle decreases significantly, collapse occurs after 120 hours, and the rebound modulus decreases. The reason is similar to that of Example 2. After the top layer of red bed mud is removed, the top layer cannot prevent the penetration of water vapor, which will cause the roadbed to collapse from top to bottom, and ultimately cause a decrease in the rebound modulus.

[0210] From the experimental data comparison of example 1, 2, 3 and comparative example 4 in table 1, it can be found that when the subgrade is not reinforced, the static contact angle does not decrease obviously, disintegration does not occur after 120h, but the modulus of resilience decreases, which shows that when the subgrade is not reinforced, the overall strength of the subgrade will be affected, the surface defects caused by single point defects cannot be inhibited, and finally the subgrade fails;

[0211] From the experimental data comparison of example 1, 2, 3 and comparative example 5 in table 1, it can be found that when the filling and protection of the subgrade slope are not performed, the static contact angle decreases obviously, disintegration occurs after 120h, and the modulus of resilience decreases, which shows that when the filling and protection of the subgrade slope are removed, the side cannot prevent the penetration of water vapor, which will cause the subgrade to collapse from the side to the inside, and finally also cause the decrease of the modulus of resilience, in addition, when the slope is not filled, the slope will be subjected to obvious compressive stress and cannot be released and buffered, and under the condition of high compressive stress, the collapse of the subgrade edge will also occur;

[0212] From the experimental data comparison of example 1, 2, 3 and comparative example 6 in table 1, it can be found that when the hydrophobic protection of the slope is not performed, the static contact angle decreases obviously, disintegration occurs after 120h, and the modulus of resilience decreases, which is similar to the reason of example 5, when the edge hydrophobic protection is removed, the side cannot prevent the penetration of water vapor, which will cause the subgrade to collapse from the side to the inside, and finally also cause the decrease of the modulus of resilience;

[0213] From the experimental data comparison of example 1, 2, 3 and comparative example 7 in table 1, it can be found that when the octadecyl primary amine powder is not mixed with the slope mud, the static contact angle decreases obviously, disintegration occurs after 120h, and the decrease of the modulus of resilience is not obvious, which shows that the octadecyl primary amine powder reduces the surface free energy of the soil, increases the contact angle, reduces the rolling angle, and is beneficial to the rain sliding off the slope surface;

[0214] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A method for preparing a red mudstone bionic super-hydrophobic collapse-resistant roadbed structure, characterized in that: The process includes the following steps: S1. The raw materials were stirred to prepare a biomimetic hydrophobic modified red mudstone filler; S2. Fill and reinforce the embankment with the first, second, and third layers, and cover with a geomembrane to obtain a hydrophobic roadbed; S3. The embankment slope was filled and sprayed with the prepared hydrophobic modified composite solution, compacted and dried by autothermal heating to obtain a super-hydrophobic red mudstone roadbed; In step S1, the process of stirring the raw materials comprises: uniformly stirring 1-3% octadecyl primary amine, 0.5-1.5% potassium methyl silicate, 0.5-1.5% glass fiber, 0.5-1.5% propyltrimethoxysilane, and 10-30% water with the pre-disintegrated red bed mudstone; In step S3, the embankment slope filling process, the red mudstone soil and 1-3% octadecyl primary amine powder mixed evenly filled on the slope surface, a thickness of 10-30cm; In step S2, the process of filling the embankment with the first layer includes: filling the roadbed with a hydrophobic modified red mudstone filler to obtain a first layer with a filling thickness of 10-15 cm, and performing a compaction process, wherein before the first layer is filled, the base is covered with a layer of a two-cloth-one-film composite geomembrane; In step S2, the process of filling the embankment with a second layer includes: filling the surface of the compacted roadbed with a layer of ordinary unmodified red mudstone to obtain a second layer, the filling thickness is set according to the actual work needs, and compaction is performed after filling; In step S2, the process of filling the embankment with a third layer includes: filling the surface of the second layer of ordinary red mudstone with a layer of hydrophobic modified red mudstone filler to obtain a third layer with a filling thickness of 10-15 cm.

2. The method for preparing a red mudstone bionic super-hydrophobic collapse-resistant roadbed structure according to claim 1, wherein: In step S1, the diameter of the glass fiber is 20-40 nm and the length is 10-30 μm.

3. The method for preparing a red mudstone biomimetic super-hydrophobic collapse-resistant roadbed structure according to claim 1, wherein: In step S1, the process for preparing the biomimetic hydrophobically modified red-bed mudstone filler includes: drying and crushing the mixed and stirred red-bed mudstone, and the surface roughness of the filler is 2-8 μm.

4. The method for preparing a red mudstone bionic super-hydrophobic collapse-resistant roadbed structure according to claim 1, wherein: In step S2, the embankment is reinforced, including: the reinforcement material is a rectangular glass fiber geogrid, the grid length is 3-5m, the width is 0.5-1.5m, and the height is 0.1-0.3m.

5. The method for preparing a red mudstone bionic super-hydrophobic collapse-resistant roadbed structure according to claim 1, wherein: In step S2, the process of covering the geomembrane includes: laying a two-cloth-one-membrane composite geomembrane on the surface of the third layer to obtain a hydrophobic roadbed.

6. The method for preparing a red mudstone biomimetic super-hydrophobic collapse-resistant roadbed structure according to claim 1, characterized in that: In step S3, the process for preparing a hydrophobically modified composite solution includes stirring and mixing a solute concentration of 2-6% nano-silica, 2-5% potassium methyl silicate, 2-5% propyltrimethoxysilane, 0.5-1.5% glass fiber, and the rest water.

7. The method for preparing a red mudstone biomimetic super-hydrophobic collapse-resistant roadbed structure according to claim 1, characterized in that: In step S3, the process of spraying the hydrophobically modified composite solution includes: spraying the hydrophobically modified composite solution on the surface of the red mudstone to obtain a hydrophobic roadbed slope, and the spraying amount is 1-3 kg / m 2 .

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