24results about How to "Low permeability coefficient" patented technology

The invention provides a contaminated site emergency barrier 3D printing material and a preparation method thereof, and the 3D printing material comprises the following components by mass: 45-65% of a first component; 25%-40% of granular steel slag; 2%-10% of a basalt fiber group; 2%-12% of water-soluble anionic polyurethane; wherein the first component is a mixture of steel slag powder, carbide slag powder and red mud powder. According to the contaminated site emergency barrier 3D printing material and the preparation method thereof, a barrier formed by printing the contaminated site emergency barrier 3D printing material is low in permeability coefficient and diffusion coefficient and high in breaking strength.

The preparation method comprises the following steps: uniformly stirring steel slag and tailings according to a mass ratio of (2-3): (7-8) at a high speed, adding water, continuously stirring to obtain a turbid solution, slowly adding sodium silicate into the turbid solution under high-speed stirring to obtain a mixed solution, simultaneously dropwise adding a water reducing agent and a thickening agent into the mixed solution under stirring, and uniformly stirring to obtain a slurry; and finally, carrying out a slump test on the mixture, and determining the addition amount of silica gel or water according to a test result, so as to obtain the flow-state solidified soil based on the large-particle waste residues. According to the method, through the innovative material ratio and preparation process, the stirring and pumping performance of the large-particle material is improved, the segregation risk is reduced, the homogeneity and stability of the fluid-state solidified soil are improved, meanwhile, the production cost is reduced, batch consumption of a large amount of solid waste is achieved, and the problem that use of the large-particle material in traditional fluid-state solidified soil is limited is solved.

The invention relates to a biochar enhanced microbial mineralization improved compacted clay covering barrier layer and a construction method thereof.The barrier layer is prepared from a urease bacterium excitation solution, a calcium acetate solution, biochar and site in-situ soil, the total dry mass of all components in the urease bacterium excitation solution accounts for 4.5%-8.5% of the mass of the site in-situ soil, and the total dry mass of all components in the calcium acetate solution accounts for 4.5%-8.5% of the mass of the site in-situ soil. The dry mass of the solute of the calcium acetate solution accounts for 4.0%-10.0% of the mass of the site in-situ soil material, and the dry mass of the biochar accounts for 4.0%-8.0% of the dry mass of the site in-situ soil material. Compared with the prior art, the method has the advantages that site in-situ soil materials are treated through an in-situ excitation microbial mineralization method, the seepage reduction and gas barrier performance of a compacted clay covering barrier layer can be remarkably enhanced, and meanwhile, the binding force enhanced by mineralization among soil particles plays an important role in inhibiting water loss and cracking of a soil body.

The invention belongs to the technical field of industrial byproduct ardealite recycling, and particularly relates to a complex-phase gypsum base building material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1) stirring and mixing semi-hydrated gypsum and a modifier to obtain modified semi-hydrated gypsum; the initial free water content of the semi-hydrated gypsum is less than or equal to 18.0%, and the crystal water content is less than or equal to 9.0%; s2) carrying out stockpiling conversion on the modified semi-hydrated gypsum, and then scattering to obtain complex-phase gypsum; and S3) crushing the complex-phase gypsum, supplementing water, mixing, compacting and forming to obtain the complex-phase gypsum base building material. The high-stability intermediate complex-phase gypsum between a semi-aqueous phase and a two-aqueous phase is prepared under the condition that an activity inhibitor is not added or drying treatment is carried out, the conversion rate of crystal water is slowed down under the conditions of low free water, high void and high heat release, the caking strength of a pile body is low, and certain gelling activity can be kept; the resource utilization cost of the gypsum is greatly reduced, the operation is simple, and the transportation radius is increased.

The invention discloses a construction method for excavating an upside-down well wall of a deep foundation pit under an eccentric compression working condition. The construction method is suitable for an asymmetric load scene that the soil covering height of one side of a vertical shaft is obviously larger than that of the other side of the vertical shaft. The method comprises the steps that firstly, grouting is conducted on the periphery of the shaft wall of a vertical shaft under the current ground, and a soil body reinforcing area is formed; then, a mouth locking ring beam is constructed at a shaft mouth of the vertical shaft, an upper structure comprising a retaining wall, a reverse pressing plate, a retaining wall ring beam and a plate support is upwards constructed on the mouth locking ring beam, and soil covering side earthwork is synchronously backfilled to the level ground elevation in the construction process; next, an upside-down well wall method is adopted for subsection downward excavation, an annular arch frame, angle braces and anchor rod supports are constructed after each section is excavated, and an upper ring beam and a lower ring beam are arranged at the horsehead position and connected with the adjacent arch frames through vertical supports; and finally, concrete bottom sealing is conducted on the shaft completion face. The anti-overturning moment is formed through the reverse pressing plate and synchronous backfilling, and the problem of well wall instability caused by eccentric loads is effectively solved in combination with a multi-stage supporting system.

The present application relates to a kind of ground penetrating radar detection and disease treatment method for deep high pressure tunnel, and the field measuring line is the net structure of two horizontal and two vertical, radar transmitting antenna continuously emits pulsed high frequency electromagnetic wave to underground, receiving antenna receives the reflection wave and transmission wave generated by interface or target body with electrical difference, the property of target body is determined according to the form, strength and its change of radar map reflection wave, and forecast is formed;Forecast content includes four aspects of whether there is broken rock stratum in the surrounding rock in front of working face, whether there is water-rich rock stratum in the surrounding rock in front of working face, whether there is the possibility of water or mud inrush in the surrounding rock in front of working face, and fault fracture zone and its water content in front of working face;Treatment scheme is formulated according to forecast content, combined with engineering profile summary, survey and construction design document and construction specification.

The invention relates to a microbial exopolysaccharide for reducing soil porosity, a preparation method and application. The preparation method comprises the following steps: (1) inoculating microorganisms into a culture medium A, and culturing to obtain a seed solution; inoculating the seed solution into a culture medium B, culturing to obtain fermentation liquor, centrifuging to obtain fermentation liquor supernate, and performing rotary evaporation concentration to obtain concentrated liquor; (2) mixing the concentrated solution with ethanol, and centrifuging to obtain a polysaccharide precipitate; adding water into the polysaccharide precipitate, stirring and dissolving, dialyzing, and carrying out vacuum freeze drying to obtain crude polysaccharide; and (3) preparing the crude polysaccharide into a crude polysaccharide solution, then performing chromatographic separation, gradient elution and vacuum freeze drying, dialyzing, and then performing freeze drying to obtain the microbial exopolysaccharide. The microbial exopolysaccharide is good in rheological property, high in viscosity, simple to prepare, capable of being produced on a large scale, capable of effectively reducing the porosity of media such as soil and quartz sand and capable of being applied to the field of environmental remediation.

The invention relates to the cross technical field of solid waste resource utilization and low-carbon building material preparation, in particular to a seawater and fly ash coal-based solid waste material preparation method which comprises the following steps: step 1, carrying out ball milling modification on fly ash, and filtering impurities from seawater to obtain pretreated seawater; 2, adding a composite alkali activator into the pretreated seawater to prepare an excitation solution, and reacting with the modified fly ash at 60-70 DEG C for 90-120 minutes to obtain an active calcium ion dissolution solution; 3, a trioctylamine-sulfonated kerosene system with the volume ratio being 1: (3-5) is used for extraction for 40-50 min at the temperature of 35-40 DEG C, and chloride ions are removed; and 4, transferring the dechlorinated solution into a high-pressure reaction kettle, introducing carbon dioxide under the conditions of 0.8-1.2 MPa and 55-65 DEG C for mineralization for 180-240 minutes, and curing, drying and demolding the slurry to obtain the finished product material. And the material performance index meets the ocean engineering building material standard.

The invention provides an epoxy modified cement-based material, the epoxy modified cement-based material comprises an organic phase structure and inorganic crystals, and the inorganic crystals are radially distributed on the surface of the organic phase structure; the organic phase structure is a spherical or sphere-like structure with the diameter of 3-15 microns; the inorganic crystal is of a needle-shaped, rod-shaped or sheet-shaped structure with the length being 0.3-3 microns and the diameter being 0.05-0.5 microns. The epoxy modified cement-based material disclosed by the invention shows good adhesion and dispersion resistance under water or in a humid environment, can realize rapid underwater construction, and keeps stable performance for a long time under harsh conditions such as a marine environment and a humid environment; the engineering requirements of multiple fields such as building structure repairing, underwater repairing, rapid first-aid repair, ocean protection and road and bridge engineering are met, and the integration of high strength, high toughness, strong interface bonding and long-acting durability is realized.

The invention discloses a waterproof construction method for a cave dwelling building roof. The waterproof construction method comprises the following steps that firstly, part of original covering soil is dug; 2, mixing the excavated original covering soil with a curing agent, an additive and water to obtain flow-state solidified soil; and thirdly, a first layer of flow state solidified soil is poured on the compacted covering soil, then an adhesion agent is brushed, geogrids are laid, and then a second layer of flow state solidified soil is poured. According to the method, part of original covering soil of the cave dwelling building roof is excavated and prepared into the flow-state solidified soil, finally the flow-state solidified soil is poured back to the cave dwelling building roof, site spoil is utilized, resource utilization of building waste is achieved, and the method is economical and environmentally friendly; meanwhile, narrow gaps, pores and cracks which are difficult to treat by a traditional material are filled by utilizing the fluidity and the self-compaction characteristic of the fluid-state solidified soil; and furthermore, a solidified body formed after hardening has excellent anti-permeability performance, so that permeation of kiln crown covering soil water is effectively blocked, the stubborn disease of kiln crown covering soil water seepage is radically treated, and the material cost is reduced by more than 30% compared with that of a traditional method.

The application provides a kind of underwater concrete rapid repair material, by weight fraction, including the following components: cementing material system 67-80 parts, dual functional graphene system 0.6-1.2 parts, intelligent curing adjustment system 3-5 parts, auxiliary additive 2-3 parts, filler system 20-25 parts and water 18-25 parts;The dual functional graphene system includes hydrophilic amino graphene and hydrophobic sulfhydryl reduced graphene oxide, and the mass ratio of the two is (1.2-1.8):(0.8-1.2);The intelligent curing adjustment system includes microcapsule coated temperature-sensitive coagulant 2-3 parts and in-situ whisker generation precursor 1-2 parts.The application realizes underwater rapid curing, strong bonding, high toughness, long-term protection integration, and provides a high-performance solution for the rapid repair and emergency repair of hydraulic and marine infrastructure.

The present invention discloses a method for continuous water injection test of soil anti-seepage body of dangerous reservoir dam. The method comprises the following steps: step 1: determining the drilling position; step 2: selecting the water injection test method; step 3: conducting a continuous water injection test of the test section above the groundwater level; step 4: conducting a continuous water injection test of the test section below the groundwater level. The present invention has the advantages of being able to comprehensively and accurately evaluate the anti-seepage performance of dangerous reservoir dams and being easy to operate.

The present application relates to the field of anti-seepage dam construction, and discloses a dam body structure of a soil-rock cofferdam back slope type anti-seepage dam and a construction method thereof, which comprises a foundation, a dam body is arranged on the upper side of the foundation, a drainage cavity is formed in the dam body, an installation plate is fixedly connected to the inner wall of the drainage cavity, a plurality of drainage cylinders are rotatably connected to the installation plate, a driving mechanism matched with the drainage cylinders is arranged in the drainage cavity, a connecting pipe is arranged on the inner wall of the drainage cavity, a plurality of rotary joints are arranged on the connecting pipe, the drainage cylinders are rotatably connected to the inner wall of the rotary joints, and drainage pipes are fixedly connected to the two ends of the connecting pipe, and flow valves are arranged on the drainage pipes. In the present application, the driving mechanism is arranged to drive the drainage cylinders to rotate and drain water, and the adjustable flow valves can actively and quickly drain the water accumulated around the dam body, effectively reduce the water pressure around the dam body, reduce the lateral pressure borne by the dam body, and improve the stability of the dam body.

This invention discloses an environmentally friendly, high-efficiency permeability-reducing composite material for sand and its applications. The environmentally friendly, high-efficiency permeability-reducing composite material comprises xanthan gum, nano-silica, and pectinase, used to improve the strength and reduce the permeability of sand. The invention first mixes sand and soil in equal proportions to obtain clayey sand, then incorporates the environmentally friendly, high-efficiency permeability-reducing composite material to obtain remolded sand. Permeability tests, triaxial shear tests, and microscopic tests on the remolded sand show that after incorporating the environmentally friendly, high-efficiency permeability-reducing composite material, gel material is uniformly distributed on the surface and within the pores of the remolded sand, forming a non-penetrating pore structure within it, reducing the permeability of the remolded sand. Furthermore, long-term curing can improve the strength and ductility of the remolded sand. The environmentally friendly, high-efficiency permeability-reducing composite material provided by this invention is environmentally friendly, efficient, low-cost, and applicable to multiple scenarios, with broad application prospects.

The application discloses a kind of super-hydrophobic soil water-resisting layer and its construction method, belong to slope protection engineering technical field, the super-hydrophobic soil water-resisting layer is used for soft rock slope, by quality ratio is composed of basic component and functional component, basic component includes polymer curing agent 20 parts, guest soil 60 parts, straw fiber 5 parts;Functional component includes the total quality 0.5% of basic component starch graft acrylamide type microbial water-retaining agent, 2 parts nano SiO2, 0.3 parts KH-550 silane coupling agent, it can also be mixed with specific ratio grass seed.Its construction method includes four core steps of slope pretreatment, bottom curing, water-resisting layer laying, later maintenance, and drainage blind ditch strengthening measures are added for strong weathered soft rock slope.The super-hydrophobic soil water-resisting layer realizes the ecological restoration and long-acting water-resisting protection of soft rock slope, is suitable for the protection of various soft rock slopes in highway, railway, water conservancy and other engineering, has significant technical innovation and engineering application value.

The invention discloses an anti-seepage grouting device and technology for a cast-in-place pile, and particularly relates to the technical field of grouting of the cast-in-place pile, the device comprises a grouting machine and a slurry storage barrel, one end of a connecting pipe is provided with a grouting mechanism used for grouting, differential management of branch pipelines is achieved through the grouting mechanism and an intelligent pressure controller during grouting, and the grouting efficiency is improved. The grouting material can be effectively utilized, so that more slurry is saved, the slurry is diffused more uniformly, the continuity of an impervious layer is better, the slurry is directionally jetted due to compression expansion of the elastic microporous sleeve, the construction time of a single pile can be shortened through a directional jetting technology, the comprehensive manufacturing cost is reduced, and the process is divided into three grouting stages, so that the construction efficiency is improved. A main body impervious layer is formed through first-time grouting, shrinkage cracks are filled for the second time, pressure is maintained for the third time to ensure compactness, the shrinkage cracks are better eliminated through the three-time grouting technology, and the permeability coefficient of a pile-soil interface is reduced.

The invention provides anti-seepage commercial concrete and a preparation method thereof, and relates to the technical field of building materials, and the anti-seepage performance of the anti-seepage commercial concrete is remarkably improved through a scientific proportion and a unique preparation method. The permeability coefficient is greatly reduced, water permeation can be effectively prevented, and the problems of structural damage, steel bar corrosion and the like caused by water invasion of a building are avoided. Therefore, the service life of the building is prolonged, and the later maintenance and reinforcement cost is reduced. For example, in underground waterproof engineering, by using the concrete, the risk of basement leakage can be remarkably reduced, dryness and safety of underground space are guaranteed, a comfortable environment is provided for a user, the compressive strength of the concrete in 7 days and 28 days is remarkably improved through the optimized raw material combination and the preparation process, and the concrete has good waterproof performance. A large amount of fly ash, mineral powder and other industrial waste residues are used for replacing part of cement, comprehensive utilization of resources is achieved, and energy consumption and environmental pollution in the cement production process are reduced.

The invention belongs to the technical field of loess improvement, and particularly discloses a loess improver based on fly ash-polyacrylamide and a preparation method of the loess improver based on fly ash-polyacrylamide, and the loess improver comprises the following components in parts by mass: 84.5-94.85 parts of natural loess; 5 to 15 parts of fly ash; and 0.15 to 0.5 part of anionic polyacrylamide. According to the loess modifier based on the fly ash-polyacrylamide, a soil body structure is optimized through a filling-cementing synergistic mechanism, pores are effectively filled with the fly ash microspheres and colloidal products thereof, and the anionic polyacrylamide forms cementing bridging among particles, so that point contact among the particles is promoted to be converted into surface inlay contact together, and the loess modifier has the advantages that the soil body structure is optimized; the compactness of the soil body is obviously enhanced, so that the synchronous improvement of the shear strength and the anti-permeability performance is realized.

The invention provides a soil stabilizer and a soil desertification control method, and belongs to the field of soil desertification control, the soil stabilizer comprises the following components by mass: 70-90% of a base material; 7-15.2% of a water retention material; 3-14.8% of a curing material; wherein the water retention material comprises polyethylene acid calcium; sodium polyacrylate is replaced with polyethylene acid calcium, the polyethylene acid calcium is good in natural degradability, degradation products are free of pollution, the polyethylene acid calcium is suitable for the high-salt environment of desertified soil, the overall stability of sandy soil is enhanced, the mechanical properties of compression resistance and shear strength are improved, and soil loss is reduced; and the soil conditioner has a good soil moisturizing function, is more beneficial to plant growth, improves the evaporation resistance or impermeability of sandy soil, prevents leakage of surface water or underground water, and stores water resources.

The utility model discloses a seawall water stop structure, and relates to the technical field of seawall seepage prevention. The seawall water stop structure comprises an anti-seepage water stop structure arranged along the axis of a seawall, a seawall core stone layer covers the anti-seepage water stop structure, and the section of the seawall core stone layer is trapezoidal; foot protection block stones are arranged on the feet of the dike core stone layer, and a block stone surface protection layer and a concrete accropode block layer are arranged on the slope face of the dike core stone layer. A gravel layer, a water stable layer and an asphalt layer are sequentially arranged at the top of the dike core stone layer from bottom to top; the seepage-proofing and water-stopping structure comprises two rows of steel sheet piles which are oppositely arranged, and clay is filled between the two rows of steel sheet piles. According to the embodiment provided by the utility model, the riprap seawall structure is optimized, and the construction sequence is changed, the construction process flow is simplified, the construction difficulty of a seawall structure project is reduced, the construction cost of the project is saved and the construction efficiency of the project is improved while the seepage-proofing and water-stopping functions of the structure are ensured.

The present application relates to railway roadbed technical field, disclose a kind of railway roadbed anti-seepage drainage system, comprising: solid waste base composite anti-seepage layer, solid waste base composite anti-seepage layer is set in the upper of road basic body along height direction;Hierarchical solid waste drainage layer, hierarchical solid waste drainage layer is set between solid waste base composite anti-seepage layer and road basic body;Slope anti-seepage slope protection layer, slope anti-seepage slope protection layer is set on roadbed slope;Intercepting and draining structure, intercepting and draining structure is set on solid waste base composite anti-seepage layer;Roadbed side drainage system, roadbed side drainage system is respectively communicated with hierarchical solid waste drainage layer, slope anti-seepage slope protection layer and intercepting and draining structure, suitable for collecting liquid from hierarchical solid waste drainage layer, slope anti-seepage slope protection layer and intercepting and draining structure and leads to the range of roadbed. Hierarchical solid waste drainage layer rapidly leads to drainage leachate, cooperates with roadbed side drainage system to collect and process, reduces water body invasion risk. Slope anti-seepage slope protection layer intercepts slope water body penetration, leads into drainage system, prevents penetration road basic body.

The invention discloses an acrylate grouting material for impervious repair of concrete cracks and a preparation method of the acrylate grouting material, and relates to the technical field of building materials. The preparation method of the acrylate grouting material at least comprises the following steps: mixing 15-25 parts by mass of acrylate and 50-60 parts by mass of water, adding 20-30 parts by mass of a cross-linking agent and 0.5-2 parts by mass of an accelerant, and uniformly dispersing to obtain a component A; uniformly dispersing 50-60 parts by mass of modified styrene-acrylic emulsion, 40-50 parts by mass of water, 1-3 parts by mass of an initiator and 1-5 parts by mass of modified talcum powder to obtain a component B; and blending the component A and the component B to obtain the acrylate grouting material. The prepared acrylate grouting material is excellent in impermeability and small in drying shrinkage volume, and the durability is also improved.

The invention discloses a polymer waterproof material and a slope protection waterproof isolation pad, and relates to the technical field of polymer materials. The invention uses ethylene glycol dimethacrylate and glycidyl methacrylate as raw materials to prepare a modifier; then uses diethyltriamine and succinic anhydride to react to obtain component one; component one is modified by benzaldehyde and 1,2,4-trimellitic anhydride in sequence to obtain a polymer; finally, the secondary amine on the polymer polymer is alkylated with the epoxy group on the modifier to prepare a polymer waterproof material. The slope protection waterproof isolation pad of the present application has two layers of geotextiles and a modified mixed soil composition with a middle seal. The modified mixed soil composition prepared in the present application has the characteristics of high adsorption rate, fast adsorption rate, and selective adsorption, which effectively avoids the problem that the pores between the particles increase after the soil particles are corroded by landfill leachate, resulting in a decrease in the compactness of the structure and a decrease in the attraction between the particles.

The application provides an underwater butt joint reinforcement method in a high water pressure and strong permeation stratum, relates to the field of shield construction, is suitable for underwater butt joint engineering of two large-diameter shield machines, has high safety for high water pressure and strong permeation strata, effectively meets special working conditions of limited underwater construction space, and specifically comprises the following steps: step 1, a plurality of radial grouting holes are arranged in a middle shield of the shield machine, a water stop curtain is formed around the shield machine through radial grouting, and a closed construction environment is provided for subsequent construction; step 2, a plurality of groups of inclined grouting holes are pre-buried on the shield shell, advanced grouting reinforcement is carried out, and the stratum is improved to facilitate the formation of a frozen wall; step 3, after the advanced grouting is completed, a freezing pipe is inserted into the inclined grouting hole to carry out freezing reinforcement; step 4, a pressure relief hole is reserved on the shield machine, the pressure relief hole is inclined through a shield air bubble bin, and the pressure relief hole is used to control the frost heaving force and the frost heaving amount; and step 5, after the freezing is completed, whether water leakage occurs is observed through the pressure relief hole to detect the freezing quality.