Solid-waste-based high-toughness material for isolating oxygen from surface cracks of shallow buried coal seam as well as preparation method and application of solid-waste-based high-toughness material

Abstract

The invention relates to the technical field of coal mine fire prevention and control, and discloses a solid-waste-based high-toughness material for shallow buried coal seam earth surface crack oxygen isolation and a preparation method and application thereof.The solid-waste-based high-toughness material comprises a modified spandex blended fabric, a self-foaming solid-waste-based cementing material, a waterproof sealing compound fabric and rhombus line piles; wherein the modified spandex blended fabric and the waterproof sealing compound fabric are oppositely laid up and down, and the rhombic wire piles are of a three-dimensional net structure and serve as a supporting frame to be evenly distributed and connected between the modified spandex blended fabric and the waterproof sealing compound fabric. The self-foaming solid waste-based cementing material is filled in the rhombic line pile structure between the modified spandex blended fabric and the waterproof sealing compound fabric to form a three-layer compound structure. In the process that the solid waste-based high-toughness material is used for conducting oxygen isolation on the surface cracks of the shallow buried coal seam group, the method can better adapt to complex terrains and crack forms, the material is light and easy to carry, the construction technology is simple and convenient, flexibility is high, and operation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine fire prevention and control, and particularly relates to a solid waste-based high-toughness material for oxygen isolation of surface fissures in shallow-buried coal seams, a preparation method thereof, and an application thereof. Background Art

[0002] With the extensive exploitation of coal resources, the problem of surface fissures in shallow-buried coal seam groups has become increasingly prominent. These fissures not only damage the surface vegetation and affect the ecological environment, but also may cause a series of geological disasters such as ground subsidence and soil erosion. At the same time, some coal mines in certain areas have the characteristics of shallow burial, thick coal seams, and close spacing. During the exploitation of coal seam groups, the surface and overlying rock fissures are significantly developed and the air leakage is serious, continuously supplying oxygen to the coal spontaneous combustion environment in the corresponding goaf, and thus facing a serious threat of coal mine spontaneous combustion fires, which brings a serious threat to the production and life of local residents. Traditional oxygen isolation materials often have problems such as insufficient toughness, easy aging, poor weather resistance, etc., and are difficult to meet the long-term and effective oxygen isolation requirements. For the problem of coal spontaneous combustion in the goaf caused by surface fissures in shallow-buried coal seam groups, the existing prevention and control measures also have certain limitations. In the context of environmental protection and resource recycling, how to develop new environmentally friendly materials using solid waste has become an important research direction. Solid wastes such as slag, fly ash, construction waste, etc. not only occupy a large amount of land, but also cause serious environmental pollution. Therefore, recycling these solid wastes and developing new materials that can effectively seal surface fissures and prevent coal spontaneous combustion disasters caused by air leakage in the goaf, while reducing environmental pollution, has important practical significance and broad application prospects.

[0003] At present, the technical measures for controlling air leakage in surface fissures of shallow-buried coal seam groups include traditional materials such as cement mortar, concrete, chemical grouting technology (bitumen, polymer), etc. These materials often have problems such as insufficient toughness, insufficient sealing of fissures in complex geological environments, easy cracking and aging resulting in secondary air leakage, easy water loss, poor weather resistance, etc., and are difficult to meet the long-term and effective oxygen isolation requirements. In addition, some studies have tried to use bio-based or renewable materials for oxygen isolation of fissures. Although these materials have good environmental adaptability and toughness, the cost is relatively high. Especially for the treatment of larger fissures and complex geological conditions, the technical requirements are high and the operation difficulty is large, and there are still certain limitations.

[0004] Therefore, aiming at the problem of air leakage in surface fissures of shallow-buried coal seam groups, it is urgent to develop new materials and technologies to improve the toughness, durability and adaptability of existing technologies, simplify the construction process, reduce costs, and strengthen the monitoring and evaluation of oxygen isolation effects, so as to achieve safer and more efficient coal seam exploitation and environmental protection. Summary of the Invention

[0005] Based on this, the present invention provides a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallowly buried coal seams, aiming to solve the deficiencies of existing materials in aspects such as oxygen isolation effect, toughness, durability, and environmental adaptability during the process of plugging air leakage to prevent coal spontaneous combustion, simplify the on-site construction process, reduce costs, turn waste into treasure, treat disasters with waste, and at the same time enhance the monitoring and evaluation capabilities for the oxygen isolation effect of gob areas with surface fissures in shallowly buried coal seams, so as to more effectively achieve safe and efficient coal seam mining and environmental protection.

[0006] To achieve the above object, the present invention provides a preparation method of a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallowly buried coal seams, comprising the following steps:

[0007] Step 1), material prefabrication;

[0008] ⑤ Prefabricate a waterproof and sealed composite fabric

[0009] Select at least one of aramid fiber, glass fiber, ceramic fiber, and asbestos fiber and mix it with waterborne polyurethane glue by soaking to ensure that the glue uniformly coats the surface of the fiber, thereby enhancing the bond between the fiber and the glue. Then uniformly coat the mixed fiber on both sides of the Sympatex film. After completion, sandwich the treated Sympatex film between hot plates and hot press it at 120 - 150 °C and 2 - 3 MPa for 40 min, and then cool and cure to form a waterproof and sealed composite fabric;

[0010] ⑥ Prefabricate a modified spandex blended fabric

[0011] Blend spandex, polyester fiber, and polypropylene fiber to form a fabric, then coat the fabric with polyurethane, cure it by natural curing, and dry it to obtain a modified spandex blended fabric;

[0012] ⑦ Prefabricate a diamond-shaped wire pile

[0013] Cut loofah into small sections of 15 - 30 mm, dry it, add it to the mixed aqueous solution of chlorinated vinylidene emulsion and VAE emulsion, take it out after soaking treatment, and obtain modified loofah fiber through curing and drying and then compression by a hot press; mix the obtained modified loofah fiber with polypropylene fiber or polyester fiber, put it into a cavity mold with a diamond-shaped groove arrangement inside, apply a temperature of 120 - 130 °C and a pressure of 2 - 3 MPa to make the fiber raw materials fully fuse, and then cool and form it in the mold to ensure curing and form a diamond-shaped wire pile with a firm contour;

[0014] ⑧ Prefabricate a self-foaming solid waste-based cementitious material

[0015] Mix steel slag, slag, fly ash, desulfurized gypsum, sodium bicarbonate, sodium dodecyl sulfate, coconut oil diethanolamide, sodium alginate, water glass, and water evenly to obtain a self-foaming solid waste-based cementitious material;

[0016] Step 2), composite assembly of prefabricated materials;

[0017] First, lay the modified spandex blended fabric and the waterproof and sealant composite fabric flat on top of each other, with the opposite sides coated with acrylic adhesive. Then, evenly distribute the diamond-shaped wire piles between the modified spandex blended fabric and the waterproof and sealant composite fabric. By applying pressure, the diamond-shaped wire piles are fixedly connected between the modified spandex blended fabric and the waterproof and sealant composite fabric through the acrylic adhesive. Then, pour the self-foaming solid waste-based gelling material into the diamond-shaped wire pile structure between the modified spandex blended fabric and the waterproof and sealant composite fabric to fully fill the entire space, and finally obtain a solid waste-based high-toughness material for oxygen isolation of surface fissures in shallowly buried coal seams.

[0018] As a further preferred technical solution of the present invention, in the fiber raw materials used for the waterproof and sealant composite fabric, the mass ratio of aramid fiber is 45%-55%.

[0019] As a further preferred technical solution of the present invention, the weaving density of the waterproof and sealant composite fabric is 200-250 g / m 2 , and the thickness of the waterproof and sealant composite fabric is 2-3 mm.

[0020] As a further preferred technical solution of the present invention, in the step of prefabricating the waterproof and sealant composite fabric: the hot pressing temperature is 120-150 °C.

[0021] As a further preferred technical solution of the present invention, in the raw material components of the modified spandex blended fabric: spandex accounts for 10-15 wt%, polyester fiber accounts for 40-55 wt%, and polypropylene fiber accounts for 30-50 wt%; the coating dosage of polyurethane is 10-16% of the total mass of spandex, polyester fiber and polypropylene fiber, and the solid content of polyurethane is 50-70%; and / or, the weaving density of the modified spandex blended fabric is 300-400 g / m, and the thickness is 2-5 mm.

[0022] As a further preferred technical solution of the present invention, in the raw material components of the self-foaming solid waste-based cementitious material: steel slag accounts for 30-40 parts, slag accounts for 20-30 parts, fly ash accounts for 20-30 parts, desulfurized gypsum accounts for 10-20 parts, the dosage of sodium bicarbonate accounts for 0.5-1.5% of the total mass of the self-foaming solid waste-based cementitious material, the water-solid ratio is 0.35-0.45, the mass ratio of sodium dodecyl sulfate (SDS) to coconut oil diethanolamide (DEA) is 7:3, the total amount of sodium dodecyl sulfate (SDS) and coconut oil diethanolamide (DEA) is 0.1-0.5% of the total mass of the self-foaming solid waste-based cementitious material, the dosage of sodium alginate is 0.2-0.6% of the total mass of the self-foaming solid waste-based cementitious material, the dosage of water glass is 4%-8% of the total mass of the self-foaming solid waste-based cementitious material, and the water glass modulus is between 2.0 and 2.5.

[0023] As a further preferred technical solution of the present invention, in the diamond-shaped wire pile, the mass ratio of the modified loofah sponge is 35-45%, and the mass ratio of polypropylene fiber or polyester fiber is 55-65%.

[0024] As a further preferred technical solution of the present invention, the following steps are further included:

[0025] After pouring the self-foaming solid waste-based cementitious material into the gap between the modified spandex blended fabric and the waterproof and sealing composite fabric, use an acrylic adhesive to bond the polypropylene fiber mesh around the periphery of the solid waste-based high-toughness material to ensure that the edge of the solid waste-based high-toughness material can cover and fix the edge of the diamond-shaped wire pile; the polypropylene fiber mesh is formed by weaving polypropylene fibers into a mesh structure, and the dosage is 200-600 g / m 2 。

[0026] According to another aspect of the present invention, the present invention also provides a solid waste-based high-toughness material, which is prepared by the above method.

[0027] According to another aspect of the present invention, the present invention also provides an application of the solid waste-based high-toughness material in oxygen isolation of surface fissures in shallowly buried coal seams. It is characterized in that the solid waste-based high-toughness material is unfolded and completely covers the surface fissures of the shallowly buried coal seam; water is injected into the solid waste-based high-toughness material so that the self-foaming solid waste-based cementitious material naturally foams and cures inside the structure of the diamond-shaped wire pile. The specific application method is as follows:

[0028] It includes the following steps:

[0029] Step 1), before construction, first conduct a detailed survey of the surface air leakage area, determine the specific location and scope of air leakage, set construction boundaries, and evaluate the geological conditions and hydrological conditions;

[0030] Step 2), clean the construction area, remove the surface debris, vegetation and loose soil, unfold the solid waste-based high-toughness material, ensure it is flat and wrinkle-free, and can completely cover the air leakage cracks. When necessary, use external force to tamp the material to ensure good bonding between the oxygen isolation material and the ground. Then, use nails, anchors or other fixing materials to fix the solid waste-based high-toughness material on the ground;

[0031] Step 3), after the solid waste-based high-toughness material is laid, use equipment such as a vibratory roller to compact the solid waste-based high-toughness material to improve its sealing performance;

[0032] Step 4), inject water into the solid waste-based high-toughness material several times to enable the spontaneous foaming and curing of the solid waste-based cementitious material inside the diamond wire pile structure. The water injection interval is maintained at 2 - 2.5 h / time, and the number of water injection times is 8 - 12 times; after construction, regularly inspect and monitor the oxygen isolation effect to ensure that the air leakage problem is effectively solved.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. In the raw materials of the solid waste-based high-toughness material for oxygen isolation of shallowly buried coal seam ground fissures of the present invention, spandex, polyester fiber, polypropylene fiber and polyurethane with a high solid content are selected as the paving modified spandex blended fabric. The introduction of polyurethane greatly enhances the anti-permeability of the plugging material, effectively prevents external moisture from penetrating into the toughness material, and protects the cement material from erosion. Fiber materials such as spandex, polyester fiber and polypropylene fiber have good wear resistance, can enhance the durability of the cement blanket, reduce surface wear and extend the service life. At the same time, the composite modified spandex blended fabric also has better air permeability and comfort, making the cement blanket more suitable for the complex terrain conditions of shallowly buried coal seams; the waterproof and sealing composite fabric is composed of a mixture of aramid fiber and one of glass fiber, ceramic fiber or asbestos fiber. The fabric obtained through physical entanglement and intermolecular forces generated by adhesives has excellent stability and uniformity. Then, it is treated with Sympatex film to obtain the waterproof and sealing composite fabric. After being treated with Sympatex film, when the bottom surface of the material is laid in the air leakage area, the waterproof performance will be significantly improved. The bottom material has excellent anti-permeability and flexibility, can effectively block the loss of moisture from the toughness material to the goaf during water injection and cementitious process, and has good wear resistance, chemical resistance, high softness and long service life. While the raw materials of traditional plugging materials mainly rely on cement and inorganic materials. On the one hand, moisture is easily lost along the air leakage cracks during the setting and curing process. On the other hand, the flexible deformation effect and toughness of the materials are relatively low, and they are prone to deterioration in a humid environment and have poor tensile strength. The material described in the present invention combines a variety of high-performance fibers, enhances its stability in harsh environments, and reduces the frequency of material failures and maintenance.

[0035] 2. In the waste-based self-foaming cementitious material for oxygen isolation of surface fissures in shallowly buried coal seams of the present invention, four types of solid wastes, namely steel slag, slag, fly ash, and desulfurized gypsum, are preferably used as the base materials. A variety of clinkers combined with sodium bicarbonate and additives can undergo more sufficient hydration reactions during multiple water injection processes. Sodium bicarbonate reacts with water to generate carbon dioxide gas. SDS and DEA, as surfactants, can reduce the surface tension of the liquid phase and promote the stability of bubbles, thereby making the generated foam more uniform and persistent, forming a self-foaming cementitious material. During the prefabrication process of the waste-based self-foaming cementitious material, first of all, the selection of the four solid wastes reflects the component complementarity, mutual promotion of hydration reactions, strength characteristics, impermeability and durability, environmental friendliness and sustainability during the hydration process. Specifically, steel slag has high alkalinity and activity, can react with water to generate hydrated silicate and hydrated aluminate, and provide early strength. Slag can react slowly in water to provide long-term strength and durability. When the two are combined, they can provide a rich source of silicate, which helps to form a hydraulic cementitious material, and the early strength and late strength are synergistically improved. Fly ash, as an active mineral admixture, can react with Ca(OH)2 in steel slag and slag to form calcium silicate hydrate (C-S-H), further improving the strength and durability of the hardened body. Secondly, in the hydration reaction, desulfurized gypsum provides the amphoteric characteristics of gypsum, which helps to form a certain degree of gypsum hydrate. On the one hand, the gypsum hydrate and the C-S-H gel grow and interpenetrate with each other to form a dense network structure, improving the overall strength of the self-foaming cementitious material. On the other hand, after the combination of desulfurized gypsum and sodium bicarbonate, due to the relatively slow hydration reaction of desulfurized gypsum, the dissolution and reaction process of sodium bicarbonate can absorb part of the heat generated by desulfurized gypsum, so the synergistic effect generated by the two can control the hydration heat and improve the exothermic characteristics of the reaction. At the same time, the formed self-foaming cementitious material can form a uniform bubble structure inside, and this uniform pore structure helps to reduce the temperature difference between the inside and the outside, lower the temperature gradient. The reduction of the temperature gradient makes the stress distribution inside the material more uniform, reduces the volume change and stress concentration caused by temperature changes, and helps to reduce the generation of internal temperature cracks in the material. In addition, carbon dioxide is decomposed during the hydration process of sodium bicarbonate to form a uniform pore structure, which reduces the thermal conductivity of the material, and further makes the heat insulation effect of the waste-based high-toughness material on the spontaneous combustion temperature rise of goaf coal better. The combination of SDS and CDEA can effectively improve the generation efficiency and stability of bubbles, and sodium alginate provides a supporting structure to ensure the stability of the pore structure in the cementitious material, and finally synergistically improves the strength, durability, impermeability and workability of the self-foaming cementitious material with the hydration of solid wastes, while realizing the effective utilization of resources and environmental protection.Meanwhile, the CO2 gas generated by sodium bicarbonate can penetrate into the gob area, exerting an effective asphyxiating effect on the coal oxidation process. The material prevents the occurrence of coal spontaneous combustion in the gob area of shallow-buried coal seams from the dual effects of plugging air leakage and asphyxiating gases.

[0036] 3. In the solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow-buried coal seams of the present invention, the three-dimensional reticulated diamond-shaped wire piles connecting up and down are prepared by compounding polypropylene fibers or polyester fibers and modified loofah sponges. First of all, loofah sponge, a natural fiber as an agricultural by-product, is a biodegradable material. Using it as a raw material for the preparation of the diamond-shaped wire pile structure of the material helps to reduce the dependence on synthetic materials and improve the environmental friendliness of the material. Secondly, after the loofah sponge is modified by hot pressing and soaking treatments, the bonding property between the diamond-shaped wire pile material and the self-foaming solid waste-based cementitious material can be enhanced, generating good toughness and elasticity and improving the overall sealing performance of the material. In addition, combining the modified loofah sponge fibers with polypropylene or polyester fibers to form a diamond-shaped reticulated structure can effectively improve the mechanical properties and durability of the material. Moreover, the diamond-shaped reticulated structure usually has better dispersion performance when stressed, and can transfer external loads to the material more evenly. The overlapping of this structure can increase the contact area, thus providing a better fixing effect. Through the mutual restraint between nodes, the diamond structure can better resist multi-directional shear forces and tearing forces, enhance the tensile, compressive and bending resistance of the reticulated diamond-shaped wire pile, improve its mechanical properties, and is conducive to maintaining good deformation during the self-foaming process of the internal filling material and forming an overall covering oxygen isolation framework structure. Other shapes (such as rod-shaped, square, etc.) may be difficult to adapt to the curved laying environment due to stress concentration or strong rigidity. Usually, many connecting materials may have problems of brittle fracture when subjected to internal pressure or volume expansion. However, the prefabricated diamond-shaped wire piles of the present invention, due to their excellent flexibility and stretchability, can effectively adapt to the volume expansion generated after the self-foaming solid waste-based cementitious material is injected with water, and maintain the structural integrity and stability of the oxygen isolation material. This makes such materials have higher reliability and service life in practical applications compared with general connecting substances.

[0037] 4. The modified spandex blended fabric of the solid waste-based high-toughness material for oxygen isolation in surface fissures of shallowly buried coal seams provided by the present invention offers excellent tensile strength and toughness, while the waterproof sealing composite fabric ensures good waterproof performance, forming an effective protection system. The elasticity and toughness of the material enable it to adapt to minor changes on the surface and maintain good sealing, which helps improve the safety and reliability of the overall project. The three-dimensional mesh diamond-shaped wire piles connecting the two fabrics and the solid waste-based self-foaming gelling material filled in the middle provide support and structural stability, while enhancing the overall strength and durability of the material. In addition, the combination of the fabrics and the function of the middle filling material form an overall high-toughness, waterproof-sealing, and structurally stable leak plugging system. The overall frame structure has a certain deformability and can carry the solid waste-based self-foaming gelling material. This design can effectively disperse the pressure, reduce local stress concentration, form a good airtight environment, and further improve the leak plugging effect.

[0038] 5. Compared with ordinary cement gelling materials, the solid waste-based self-foaming material has a low density, is convenient for construction, and has excellent heat insulation effect on the heat generated by the oxidation and temperature rise of coal in the goaf; compared with foamed concrete, foamed concrete needs to be spray-shaped, while the frame structure of the solid waste-based high-toughness material described in the present invention and the internal self-foaming filler cooperate with each other, showing good toughness and ductility. The shallowly buried coal seams are affected by factors such as surface loads and geological changes, which may cause deformation of the surface or fissures. The high-toughness material can better adapt to these deformations, avoid cracking or falling off caused by the brittleness of the material, and thus maintain the plugging effect. In addition, the high-toughness oxygen isolation material reduces the air leakage problem caused by material damage, can more effectively reduce the air flow in the fissures, thereby reducing the economic cost caused by frequent maintenance and replacement of prevention and control facilities, increasing the effectiveness of plugging, and further reducing the environmental impact during the coal mining and utilization process.

[0039] 6. The solid waste-based high-toughness material for oxygen isolation in surface fissures of shallowly buried coal seams of the present invention has a low density and is arranged and fixed in a flexible manner at the surface air leakage fissures. Due to containing a large number of bubbles, the self-foaming gelling material has a low density and good heat insulation performance. Once coal spontaneous combustion is caused by air leakage from the goaf of shallowly buried coal seam groups, then this material can not only show good oxygen isolation effect, but also have a good heat insulation effect on the goaf, thereby realizing the prevention and control function of oxygen isolation and temperature reduction, and ensuring the orderly progress of mine production work;

[0040] 7. The filler of the solid waste-based high-toughness material for oxygen isolation in surface fissures of shallowly buried coal seams of the present invention is composed of all solid wastes, effectively improving the problems of high cost and waste of solid waste resources of traditional surface fissure oxygen isolation materials, treating disasters with waste, having practical significance for the construction of green mines, and having good social benefits and broad application prospects.

[0041] 8. During the process of using the solid waste-based high-toughness material of the present invention to isolate oxygen from the surface cracks of shallowly buried coal seam groups, it can better adapt to complex terrains and crack morphologies. The material is light and easy to carry, the construction process is simple, the flexibility is strong, and the operation is easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0043] Figure 1 It is a schematic structural diagram of the solid waste-based high-toughness material of the present invention.

[0044] Figure 2 It is a schematic structural diagram of the solid waste-based high-toughness material of the present invention applied to isolate oxygen from the surface cracks of a shallowly buried coal seam.

[0045] In the figure: 1. Modified spandex blended fabric, 2. Waterproof and sealed composite fabric, 3. Self-foaming solid waste-based cementitious material, 4. Diamond-shaped wire pile, 5. Polypropylene fiber mesh, 100. Solid waste-based high-toughness material.

[0046] The realization of the object, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. SPECIFIC EMBODIMENTS

[0047] The following will describe in detail the specific embodiments of the present invention with reference to the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0048] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the technical field to which the present invention belongs. The test reagents used in the following embodiments are all conventional biochemical reagents unless otherwise specified; the experimental methods used are all conventional methods unless otherwise specified.

[0049] Embodiment 1:

[0050] As Figure 1 shown, a solid waste-based high-toughness material for isolating oxygen from the surface cracks of a shallowly buried coal seam includes a modified spandex blended fabric 1, a self-foaming solid waste-based cementitious material 3, a waterproof and sealed composite fabric 2, and a diamond-shaped wire pile 4. Among them, the modified spandex blended fabric 1 and the waterproof and sealed composite fabric 2 are laid flat relative to each other up and down. The diamond-shaped wire pile 4 has a three-dimensional network structure and is uniformly arranged as a support frame and connected between the modified spandex blended fabric 1 and the waterproof and sealed composite fabric 2. The self-foaming solid waste-based cementitious material 3 is filled in the diamond-shaped wire pile structure between the modified spandex blended fabric 1 and the waterproof and sealed composite fabric 2 to form a three-layer composite structure in this way. In addition, a polypropylene fiber mesh 5 is also arranged around the solid waste-based high-toughness material to cover the outer edge of the solid waste-based high-toughness material and fix the edge of the diamond-shaped wire pile 4.

[0051] The modified spandex blended fabric, self-foaming solid waste-based gelling material, waterproof and sealing composite fabric, and diamond-shaped wire pile are prefabricated according to the following methods respectively:

[0052] The modified spandex blended fabric is formed by blending 15% wt spandex, 45% wt polyester fiber, and 40% wt polypropylene fiber to form a fabric, and then a polyurethane coating accounting for 10% of the total fiber mass is coated on the fabric. The solid content of the polyurethane is 70%. The specific preparation method is as follows: Spandex, polyester fiber, and polypropylene fiber are blended in a preset ratio, and then the polyurethane is evenly coated on the fabric by roll coating for treatment. After natural curing and solidification, it is dried for standby.

[0053] The self-foaming solid waste-based gelling material is composed of 30 parts of steel slag, 30 parts of slag, 30 parts of fly ash, 10 parts of desulfurized gypsum, with a water-solid ratio of 0.4, and then 0.5% of sodium bicarbonate, 0.5% of sodium dodecyl sulfate, and coconut oil diethanolamide (the mass ratio of SDS to DEA is 7:3), 0.6% of sodium alginate, and 6% of water glass are added as additives and mixed.

[0054] The waterproof and sealing composite fabric is made of 55% aramid fiber and 45% glass fiber, and is treated with Sympatex film and waterborne polyurethane glue. The specific preparation method is as follows: Glass fiber and aramid fiber are mixed with waterborne polyurethane glue by soaking to ensure that the glue uniformly coats the fiber surface, thereby enhancing the bond between the fiber and the glue. Then, a Sympatex film with a thickness of 30 microns is used as the intermediate layer, and glue is evenly coated on both sides. The mixed fiber and the Sympatex film are combined together by hot pressing. The hot pressing temperature is controlled at 150 °C, the pressure is controlled at 3 MPa, and the pressing time is controlled at about 40 min. After completion, it is cooled and solidified and demolded.

[0055] The diamond-shaped wire pile is prepared by compounding 65% of polypropylene fiber and 35% of modified loofah sponge. The specific preparation method is as follows: First, the loofah sponge is cut into small sections of 30 mm, dried at 85 °C for 10 hours, and then added to an aqueous solution of a mixture of chloroprene emulsion and VAE emulsion (volume ratio 1:1). After soaking for one hour, it is taken out, cured and dried, and then compressed by a hot press to obtain modified loofah sponge fiber; then the obtained modified loofah sponge fiber and polypropylene fiber are mixed evenly in a ratio (mass ratio 4.5:5.5), and placed in a cavity mold with a diamond-shaped groove arrangement designed inside. The temperature is applied at 130 °C and the pressure is 3 MPa to make the fiber raw materials fully fuse, and a diamond-shaped wire pile shape is formed during the curing process.

[0056] This embodiment also provides a preparation method of the solid waste-based high-toughness material, as well as a usage method of applying the solid waste-based high-toughness material to the oxygen isolation of surface fissures in shallowly buried coal seams, which are specifically as follows:

[0057] 1) On the basis of the above material prefabrication, lay a waterproof and sealed composite fabric to ensure it is flat and without wrinkles; evenly apply the water-based acrylic glue on the surfaces of the modified spandex blended fabric and the waterproof and sealed composite fabric for lamination, then evenly distribute the diamond-shaped wire piles on the modified spandex blended fabric, control the interval between the two layers of fabrics to be 8 cm, cover the waterproof and sealed composite fabric on the wire piles, and apply a pressure of 0.3 MPa to make the acrylic adhesive show a good bonding effect, so that the diamond-shaped wire piles, as the support framework, are fixedly connected to the waterproof and sealed composite fabric and the modified spandex blended fabric up and down through the acrylic adhesive, ensuring that the diamond-shaped wire piles are firmly fixed on the two layers of fabrics.

[0058] 2) After the waterproof and sealed composite fabric, the diamond-shaped wire piles and the modified spandex blended fabric are all arranged, carry out the filling of the self-foaming solid waste-based gelling material, evenly pour the mixed gelling material into the diamond-shaped wire pile structure between the waterproof and sealed composite fabric and the modified spandex blended fabric to make it fully fill the entire space and ensure the density; after the filling of the gelling material is completed, use the acrylic adhesive to sleeve the polypropylene fiber mesh on both sides of the diamond-shaped wire piles to ensure that its edge can cover and fix the edge of the wire piles, forming a complete set of solid waste-based high-toughness materials. Finally, wind up and package the fixed materials for standby.

[0059] 3) The solid waste-based high-toughness material 100 is applied to the plugging of surface fissures in shallowly buried coal seams (such as Figure 2 ):

[0060] Before construction, first conduct a detailed survey of the surface air leakage area to determine the specific location and scope of the air leakage, set the construction boundary, and evaluate the geological conditions and hydrological conditions. Then, clean the construction area, remove the surface sundries, vegetation and loose soil, unfold the solid waste-based high-toughness material 100 to ensure it is flat and without wrinkles and can completely cover the air leakage fissures. If necessary, use external force to tamp the material to ensure good combination of the oxygen isolation material and the ground, and then use nails, anchors or other fixing materials to fix the oxygen isolation material on the ground. After the laying is completed, use equipment such as a vibrating compactor to compact the solid waste-based high-toughness material 100 to improve its sealing performance. Finally, inject water into the solid waste-based high-toughness material 100 several times to enable the self-foaming solid waste-based gelling material to naturally foam and cure inside the diamond-shaped wire pile structure. The water injection interval is kept at 2 h / time, and the number of water injection times is 8 times. After construction, regularly inspect and monitor the oxygen isolation effect to ensure that the air leakage problem is effectively solved.

[0061] Example 2:

[0062] Such asFigure 1 As shown, a solid waste-based high-toughness material for oxygen isolation of surface fissures in shallowly buried coal seams includes a modified spandex blended fabric 1, a self-foaming solid waste-based gelling material 3, a waterproof and sealing composite fabric 2, and a diamond-shaped wire pile 4. The modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2 are laid flat relative to each other up and down. The diamond-shaped wire pile 4 has a three-dimensional network structure and is uniformly arranged and connected as a support frame between the modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2. The self-foaming solid waste-based gelling material 3 is filled in the diamond-shaped wire pile structure between the modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2, thus forming a three-layer composite structure. In addition, a polypropylene fiber mesh 5 is arranged around the solid waste-based high-toughness material to cover the outer edge of the solid waste-based high-toughness material and fix the edge of the diamond-shaped wire pile 4.

[0063] The modified spandex blended fabric, the self-foaming solid waste-based gelling material, the waterproof and sealing composite fabric, and the diamond-shaped wire pile are prefabricated respectively according to the following methods:

[0064] The modified spandex blended fabric is formed by blending 10%wt spandex, 40%wt polyester fiber, and 50%wt polypropylene fiber to form a fabric, and then a polyurethane coating accounting for 14% of the total fiber mass is coated on the fabric. The solid content of the polyurethane is 70%. Its specific preparation method is the same as that of Example 1.

[0065] The self-foaming solid waste-based gelling material is composed of 35 parts of steel slag, 25 parts of slag, 25 parts of fly ash, 15 parts of desulfurized gypsum, with a water-solid ratio of 0.35, and sodium bicarbonate accounting for 1% of the total powder amount, 0.3% of sodium dodecyl sulfate and coconut oil diethanolamide (the mass ratio of SDS and DEA is 7:3), 0.4% of sodium alginate, and 8% of water glass are added as additives and mixed.

[0066] The waterproof and sealing composite fabric is made of 50% aramid fiber and 50% ceramic fiber, and is treated with Sympatex film and waterborne polyurethane glue. The specific preparation method is as follows: The ceramic fiber and the aramid fiber are mixed with the waterborne polyurethane glue by soaking to ensure that the glue uniformly coats the surface of the fiber, thereby enhancing the bond between the fiber and the glue. Then, a Sympatex film with a thickness of 25 microns is used as the intermediate layer, and glue is evenly coated on both sides. The mixed fiber is combined with the Sympatex film by hot pressing molding. The hot pressing temperature is controlled at 130°C, and the pressing time is controlled at about 40 minutes. After completion, it is cooled and cured and demolded.

[0067] The rhombic wire pile is prepared by compounding 60% polyester fiber and 40% modified loofah sponge. The specific preparation method is as follows: First, cut the loofah sponge into small pieces of 20 mm, dry them at 70 °C for 8 hours, then add them to the mixed aqueous solution of chloroprene emulsion and VAE emulsion, take them out after soaking for one hour, and obtain modified loofah sponge fiber after curing and drying and then compressing through a hot press. Then, mix the obtained modified loofah sponge fiber and polyester fiber evenly according to the ratio (mass ratio of 4.5:5.5), put them into a cavity mold with a rhombic groove arrangement designed inside, apply a temperature of 125 °C and a pressure of 2.5 MPa to make the fiber raw materials fully fuse, and form a rhombic wire pile shape during the curing process.

[0068] This embodiment also provides a preparation method of the solid waste-based high-toughness material, as well as a usage method of applying the solid waste-based high-toughness material to the oxygen isolation of surface fissures in shallowly buried coal seams, which are specifically as follows:

[0069] 1) On the basis of the above material prefabrication, lay a waterproof and sealed composite fabric to ensure it is flat and wrinkle-free; evenly apply water-based acrylic glue on the surfaces of the modified spandex blended fabric and the waterproof and sealed composite fabric for lamination, then evenly distribute the rhombic wire piles on the modified spandex blended fabric, control the interval between the two layers of fabric to be 7 cm, cover the waterproof and sealed composite fabric on the wire piles, and apply a pressure of 0.25 MPa to make the acrylic adhesive show a good bonding effect, so that the rhombic wire piles are used as a support frame to fixedly connect the waterproof and sealed composite fabric and the modified spandex blended fabric up and down through the acrylic adhesive, ensuring that the rhombic wire piles are firmly fixed on the two layers of fabric.

[0070] 2) After the waterproof and sealed composite fabric, the rhombic wire piles and the modified spandex blended fabric are all arranged, carry out the filling of the self-foaming solid waste-based gelling material, evenly pour the mixed gelling material into the rhombic wire pile structure between the waterproof and sealed composite fabric and the modified spandex blended fabric to make it fully fill the entire space and ensure the density; after the filling of the gelling material is completed, use acrylic adhesive to sleeve the polypropylene fiber mesh on both sides of the rhombic wire piles to ensure that its edge can cover and fix the edge of the wire piles, forming a complete set of solid waste-based high-toughness materials. Finally, wind up and package the fixed materials for standby.

[0071] 3) The solid waste-based high-toughness material 100 is applied to the sealing of surface fissures in shallowly buried coal seams (such as Figure 2 ):

[0072] Before construction, first conduct a detailed survey of the surface air leakage area to determine the specific location and scope of the air leakage, set the construction boundary, and evaluate the geological conditions and hydrological situation. Then, clean the construction area, remove surface debris, vegetation, and loose soil, unfold the solid waste-based high-toughness material 100, ensure it is flat and wrinkle-free, and can completely cover the air leakage fissure. If necessary, use external force to tamp the material 100 to ensure good bonding between the oxygen isolation material and the ground. Then, use nails, anchors, or other fixing materials to fix the oxygen isolation material to the ground. After laying, use equipment such as a vibratory compactor to compact the solid waste-based high-toughness material 100 to improve its sealing performance. Finally, inject water into the solid waste-based high-toughness material 100 several times to allow the self-foaming solid waste-based cementitious material to naturally foam and cure inside the diamond wire pile structure. The water injection interval is maintained at 2.5 h / time, and the number of water injection times is 10 times. After construction, regularly inspect and monitor the oxygen isolation effect to ensure that the air leakage problem is effectively solved.

[0073] Example 3:

[0074] As Figure 1 shown, a solid waste-based high-toughness material for oxygen isolation of surface fissures in shallowly buried coal seams includes a modified spandex blended fabric 1, a self-foaming solid waste-based cementitious material 3, a waterproof and sealing composite fabric 2, and a diamond wire pile 4. Among them, the modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2 are laid flat relative to each other up and down. The diamond wire pile 4 is arranged in a three-dimensional network structure and serves as a support frame, evenly distributed and connected between the modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2. The self-foaming solid waste-based cementitious material 3 is filled in the diamond wire pile structure between the modified spandex blended fabric 1 and the waterproof and sealing composite fabric 2 to form a three-layer composite structure in this way. In addition, a polypropylene fiber mesh 5 is also arranged around the periphery of the solid waste-based high-toughness material to cover the outer edge of the solid waste-based high-toughness material and fix the edge of the diamond wire pile 4.

[0075] The modified spandex blended fabric, the self-foaming solid waste-based cementitious material, the waterproof and sealing composite fabric, and the diamond wire pile are prefabricated according to the following methods respectively:

[0076] The modified spandex blended fabric is formed by blending 10% wt spandex, 50% wt polyester fiber, and 40% wt polypropylene fiber to form a fabric, and then a polyurethane coating accounting for 14% of the total fiber mass is coated on the fabric. The solid content of the polyurethane is 70%. Its specific preparation method is the same as that of Example 1.

[0077] The self-foaming solid waste-based cementitious material is composed of 30 parts of steel slag, 30 parts of slag, 20 parts of fly ash, 20 parts of desulfurized gypsum, a water-solid ratio of 0.45, 1.5% of sodium bicarbonate, 0.2% of sodium dodecyl sulfate and coconut oil diethanolamide (the mass ratio of SDS to DEA is 7:3), 0.2% of sodium alginate, and 4% of water glass as additives mixed together.

[0078] The waterproof and sealing composite fabric is made from 50% aramid fiber and 50% asbestos fiber, which are treated with Sympatex film and waterborne polyurethane glue. The specific preparation method is as follows: The asbestos fiber and aramid fiber are mixed with waterborne polyurethane glue by soaking to ensure that the glue evenly coats the fiber surface, thereby enhancing the bond between the fiber and the glue. Then, a Sympatex film with a thickness of 20 microns is used as the intermediate layer, and glue is evenly coated on both sides. The mixed fiber and the Sympatex film are combined together by hot pressing. The hot pressing temperature is controlled at 120 °C, and the pressing time is controlled at about 40 min. After completion, it is cooled and cured and demolded.

[0079] The three-dimensional reticulated diamond-shaped wire pile frame is prepared by compounding 60% of polyester fiber and 40% of modified loofah sponge. The specific preparation method is as follows: First, cut the loofah sponge into small sections of 15 mm, dry it at 60 °C for 6 hours, then add it to the mixed aqueous solution of chloroprene emulsion and VAE emulsion, soak it for one hour and then take it out. After curing and drying, compress it through a hot press to obtain modified loofah sponge fiber. Then, mix the obtained modified loofah sponge fiber with polyester fiber in a ratio (mass ratio of 4.5:5.5) evenly, put it into a cavity mold with a diamond-shaped groove arrangement designed inside, apply a temperature of 120 °C and a pressure of 2 MPa to make the fiber raw materials fully fuse, and form a diamond-shaped wire pile shape during the curing process.

[0080] This embodiment also provides a preparation method of the solid waste-based high-toughness material, as well as a usage method of applying the solid waste-based high-toughness material to the oxygen isolation of surface fissures in shallowly buried coal seams, which are specifically as follows:

[0081] 1) On the basis of the above material prefabrication, lay the waterproof and sealing composite fabric to ensure it is flat and without wrinkles; evenly apply waterborne acrylic glue on the surfaces of the modified spandex blended fabric and the waterproof and sealing composite fabric for lamination. Then, evenly distribute the diamond-shaped wire piles on the modified spandex blended fabric, control the interval between the two layers of fabric to be 6 cm, cover the waterproof and sealing composite fabric on the wire piles, and apply a pressure of 0.2 MPa to make the acrylic adhesive show a good bonding effect, so that the diamond-shaped wire piles, as the support frame, are fixedly connected to the waterproof and sealing composite fabric and the modified spandex blended fabric up and down through the acrylic adhesive, ensuring that the diamond-shaped wire piles are firmly fixed on the two layers of fabric.

[0082] 2) After arranging the waterproof and sealed composite fabric, diamond-shaped wire piles, and the blended fabric of modified spandex, the filling of the self-foaming solid waste-based gelling material is carried out. The mixed gelling material is evenly poured into the diamond-shaped wire pile structure between the waterproof and sealed composite fabric and the blended fabric of modified spandex, so that it fully fills the entire space to ensure the density. After the filling of the gelling material is completed, a polypropylene fiber mesh is sleeved on both sides of the diamond-shaped wire piles with acrylic adhesive, ensuring that its edges can cover and fix the edges of the wire piles, forming a complete set of solid waste-based high-toughness materials. Finally, the fixed materials are wound up and packaged for standby.

[0083] 3) The solid waste-based high-toughness material 100 is applied to seal the surface fissures of shallowly buried coal seams (such as Figure 2 ):

[0084] Before construction, first conduct a detailed survey of the surface air leakage area to determine the specific location and scope of the air leakage, set the construction boundary, and evaluate the geological conditions and hydrological situation. Then, clean the construction area, remove the surface debris, vegetation, and loose soil, unfold the solid waste-based high-toughness material 100 to ensure its flatness and no wrinkles, and it can completely cover the air leakage fissures. If necessary, the material can be tamped with external force to ensure good bonding between the oxygen isolation material and the ground. Then, use nails, anchors, or other fixing materials 100 to fix the oxygen isolation material on the ground. After the laying is completed, use equipment such as a vibratory roller to compact the solid waste-based high-toughness material 100 to improve its sealing performance. Finally, inject water into the solid waste-based high-toughness material 100 several times to enable the self-foaming solid waste-based gelling material to naturally foam and cure inside the diamond-shaped wire pile structure. The water injection interval is maintained at 2.5 h / time, and the number of water injection times is 8 times. After construction, regularly inspect and monitor the oxygen isolation effect to ensure that the air leakage problem is effectively solved.

[0085] Evaluation of the implementation effect of fissure oxygen isolation:

[0086] Based on the above-mentioned Embodiments 1-3, during the implementation of the solid waste-based high-toughness material, the SF6 gas tracer technique is used to measure the air leakage of surface fissures. The transient release method is adopted to determine the air leakage of various surface fissures. After on-site investigation, SF6 gas is released at the surface fissures where air leakage may occur, and then an SF6 portable detector is used to test whether SF6 gas can be detected at the return air corner position of the underground working face; if SF6 gas is never detected at the underground return air corner, it indicates that the surface fissures do not leak air into the underground, indicating good plugging effect; if SF6 gas is detected, it indicates that the surface fissures leak air into the underground, indicating poor plugging and oxygen isolation effect. Regularly check the plugging effect. The mine designates a special person to check the plugging effect once a week to observe whether there is air leakage or the re-occurrence of fissures. If problems are found, repair or re-reinforce in a timely manner. Detailed records of the construction process, materials used, and monitoring results should be kept for future reference. Summarize the experience and lessons based on the implementation results to provide a reference basis for similar situations in the future.

[0087] During the construction process in a certain surface fissure area of a selected mining area as the test object, before plugging the fissures with the solid waste-based toughness material, SF6 gas is injected into the fissures, and the time and concentration when SF6 gas is first detected at the underground monitoring points #1 and #2 are recorded as the reference data before plugging; after the plugging is completed, SF6 gas is released at the edge of the solid waste-based toughness material close to the surface, and at the same underground monitoring points #1 and #2, the concentration of SF6 gas is continuously detected and the concentration data is recorded. In addition, the commonly used cement mortar material is selected for a comparative experiment. The test results are shown in Table 1 to evaluate the plugging effect of the solid waste-based high-toughness material. The monitoring results of the cement mortar and the embodiments show that before plugging, after releasing SF6 gas in the surface fissure area, SF6 gas with a concentration of 1.6 ppb can be detected at the position 0 m away from the return air corner in the underground after 10 minutes, indicating that the fissures connect the surface and the underground, and there is air leakage from the surface to the underground. If the air leakage time is too long, it may lead to the occurrence of coal spontaneous combustion disasters. After plugging the surface fissures with cement mortar, after releasing SF6 gas near the surface fissures and at the edge of the leak-proof material, SF6 is detected at the same underground detection location at intervals of 60 minutes and 80 minutes, indicating that there will be a certain leak-proof effect after plugging the surface fissures with cement mortar, but air leakage will still occur later; after plugging the surface fissures with the solid waste-based high-toughness material, after releasing SF6 gas near the surface fissures and at the edge of the leak-proof material, SF6 is never detected at the same underground detection location, indicating that the solid waste-based high-toughness material of the present invention has a good plugging effect on the surface fissures of shallowly buried coal seams, preventing air leakage from the ground to the underground, and is beneficial to preventing coal spontaneous combustion disasters in the underground.

[0088] Table 1 Results of surface air leakage determination

[0089]

[0090] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to this embodiment without departing from the principle and essence of the present invention. The protection scope of the present invention is only defined by the appended claims.

Claims

1. A method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams, characterized in that: The following steps are involved: Step 1), material prefabrication; ①Prefabricated waterproof sealing composite fabric Aramid fiber and at least one of glass fiber, ceramic fiber and asbestos fiber are selected and mixed with water-based polyurethane glue by soaking, and then the mixture is evenly coated on both sides of the Sympatex film. After completion, the treated Sympatex film is sandwiched between hot pressing plates for hot pressing treatment, and then cooled and solidified to form a waterproof sealing composite fabric; ②Prefabricated modified spandex blended fabric Spandex, polyester fiber and polypropylene fiber are blended to form a fabric, and then polyurethane is coated on the fabric, cured and dried to obtain a modified spandex blended fabric; ③Prefabricated diamond-shaped piles Cut the loofah into small segments of 15-30 mm, dry them, add them into a mixed aqueous solution of chloroprene emulsion and VAE emulsion, take them out after soaking, and compress them by a hot press after curing and drying to obtain modified loofah fibers; mix the obtained modified loofah fibers with polypropylene fibers or polyester fibers, put them into a cavity mold with rhombus grooves arranged inside for hot pressing, and then cool and shape them in the mold to solidify them into rhombus wire piles; ④ Prefabricated self-foaming solid waste-based cementitious materials Steel slag, slag, fly ash, desulfurized gypsum, sodium bicarbonate, sodium lauryl sulfate, coconut oil diethanolamide, sodium alginate, water glass and water are uniformly mixed to obtain a self-foaming solid waste-based gelling material; Step 2), composite assembly of prefabricated materials; Firstly, the modified spandex blended fabric and the waterproof sealing composite fabric are laid flat on top and bottom, and the opposite sides are coated with acrylic adhesive; then, the diamond-shaped wire piles are evenly arranged between the modified spandex blended fabric and the waterproof sealing composite fabric, and pressure is applied to fix the diamond-shaped wire piles between the modified spandex blended fabric and the waterproof sealing composite fabric through the acrylic adhesive; then, the self-foaming solid waste-based cementitious material is poured into the diamond-shaped wire pile structure between the modified spandex blended fabric and the waterproof sealing composite fabric, and the entire space is fully filled, and finally a solid waste-based high-toughness material for oxygen isolation in surface cracks of shallow buried coal seams is obtained.

2. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: Among the fiber raw materials used for the waterproof sealing composite fabric, the mass proportion of aramid fiber is 45%-55%, and the mass proportion of fiber selected from glass fiber, ceramic fiber and asbestos fiber is 55%-45%.

3. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: The weaving density of the waterproof sealing composite fabric is 200-250g / m 2 , the thickness of the waterproof sealing composite fabric is 2-3mm.

4. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: In the step of prefabricating the waterproof sealing composite fabric: the hot pressing temperature is 120-150°C.

5. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: The raw material components of the modified spandex blended fabric are: spandex accounts for 10-15wt%, polyester fiber accounts for 40-55wt%, and polypropylene fiber accounts for 30-50wt%; the coating amount of polyurethane is 10-16% of the total mass of spandex, polyester fiber and polypropylene fiber, and the solid content of polyurethane is 50-70%; and / or the knitting density of the modified spandex blended fabric is 300-400g / m, and the thickness is 2-5mm.

6. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: Among the raw material components of the self-foaming solid waste-based cementitious material, steel slag accounts for 30-40 parts, slag accounts for 20-30 parts, fly ash accounts for 20-30 parts, desulfurized gypsum accounts for 10-20 parts, the amount of sodium bicarbonate accounts for 0.5-1.5% of the total mass of the self-foaming solid waste-based cementitious material, the water-solid ratio is 0.35-0.45, the mass ratio of sodium dodecyl sulfate (SDS) and coconut diethanolamide (DEA) is 7:3, the total amount of sodium dodecyl sulfate (SDS) and coconut diethanolamide (DEA) is 0.1-0.5% of the total mass of the self-foaming solid waste-based cementitious material, the amount of sodium alginate is 0.2-0.6% of the total mass of the self-foaming solid waste-based cementitious material, the amount of water glass is 4%-8% of the total mass of the self-foaming solid waste-based cementitious material, and the water glass modulus is between 2.0-2.

5.

7. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to claim 1, characterized in that: In the diamond-shaped wire pile, the mass of the modified loofah accounts for 35-45%, and the mass of the polypropylene fiber or the polyester fiber accounts for 55-65%.

8. The method for preparing a solid waste-based high-toughness material for oxygen isolation in surface fissures of shallow buried coal seams according to any one of claims 1 to 7, characterized in that: The following steps are also included: After pouring the self-foaming solid waste-based gelling material into the gap between the modified spandex blended fabric and the waterproof sealing composite fabric, an acrylic adhesive is used to bond the polypropylene fiber mesh to the periphery of the solid waste-based high-toughness material to ensure that the edge of the solid waste-based high-toughness material can cover and fix the edge of the diamond-shaped wire pile; the polypropylene fiber mesh is formed by weaving polypropylene fibers into a mesh structure, and the amount used is 200-600g / m 2 .

9. A solid waste-based high-toughness material, characterized in that: The method is prepared by any one of claims 1 to 8.

10. The solid waste-based high-toughness material according to claim 9 is used for oxygen isolation in surface fissures of shallow buried coal seams, characterized in that: The solid waste-based high-toughness material is spread out to completely cover the surface cracks of the shallow buried coal seam; water is injected into the solid waste-based high-toughness material so that the self-foaming solid waste-based cementitious material can naturally foam and solidify inside the structure of the diamond line pile.

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