59 results about "Geosynthetic clay liner" patented technology

The present invention relates to improved bentonite barrier compositions having enhanced low permeability over time in containment applications. Of the many embodiments provided herein, one embodiment includes a method comprising: providing a bentonite barrier composition comprising: bentonite; and a polyanionic low molecular weight polymer; and forming a containment using the bentonite barrier composition to provide at least partial separation for a containment from its environment.

The invention relates to an ectopic reaction system for remediating chromium-contaminated soil and an arrangement method of the system. Chromium-contaminated soil is piled into a soil pile body in a reaction tank comprising a tank body and a soil blocking wall surrounding the tank body, wherein a geosynthetic clay liner is laid on the bottom surface and the side surface of the tank body, and an impermeable membrane and geotechnical cloth are laid on the tank body; the tail ends of the impermeable membrane and geotechnical cloth are embedded into the soil blocking wall from the outer sides; a supply pipe network for supply a remediation agent and moisture is also laid in the reaction tank; the upper surface of the soil pile body is covered by a covering membrane which completely covers the soil pile body to form an enclosed reaction system capable of preventing air from being in direct contact with the soil pile body, and the piling reaction of the contaminated soil is carried out on the system. When the environment temperature is high, moisture is evaporated gradually upward from the bottom of the pile body; when the temperature is low, water vapor is condensed, and is transferred again from the top of the pile body, so that water vapor circulation in an enclosed environment is formed, and the reaction effect is enhanced; the arrangement method is simple, and the technical requirement is low.

The invention provides a permeability coefficient determinator for a geosynthetic clay liner (GCL), which relates to an instrument for measuring the permeability coefficient of the GCL under the environment of a simulated water channel. The permeability coefficient determinator for the GCL comprises a top plate, a water storage tank, a sample clamping cushion and a water collector, wherein the top plate is fixed on the water storage tank to form a closed space; a water inlet pipe and an exhaust pipe are arranged on the upper part of the top plate; an opening is formed at the bottom of the water storage tank, and a dismountable water passing disk is arranged in the water storage tank; the sample clamping cushion is arranged below the water storage tank; a bottom plate is arranged below the sample clamping cushion, the bottom plate is relatively fixed with the top plate through bolts, and the sample clamping cushion is fixed below the water storage tank; the water collector is fixed below the bottom plate, and a plurality of water leakage holes are formed on the bottom plate and are communicated with the water collector; and a water outlet pipe is arranged below the water collector. The instrument has simple structure, can flexibly simulate water channels under the environment of different heights of water heads, can accurately measure the permeability coefficient of the GCL, and simultaneously can measure similar impermeable materials.

The invention discloses a refuse landfill seepage-proofing guide drainage system structure and a laying method thereof. An independent closed flexible reservoir-shaped seepage-proofing layer is composed of an HDPE geomembrane, a GCL (geosynthetic clay liner), a non-woven geotechnical cloth and the like, the seepage-proofing layer is provided with macadam, coarse sand and an HDPE floral tube to form a guide drainage structure for conducting guide drainage of landfill leachate and underground water, and a landfill reservoir base layer and the seepage-proofing guide drainage system structure are made stable, wherein anchoring measures are used for the guide drainage process. A double-slit sweat soldering process is mainly used for the HDPE geomembrane, and a single-slit extrusion soldering process is supplemented. A holt melting butt joint mode is used for the HDPE floral tube, a lap joint mode is used for the GCL, and a heat bonding lap joint mode is used for the non-woven geotechnical cloth. The refuse landfill seepage-proofing guide drainage system structure and the laying method thereof can solve the problems that secondary pollution happens due to the fact that refuse landfill leachate permeates into a subterranean layer, and a basement is damaged due to accumulation of the underground water. The refuse landfill seepage-proofing guide drainage system structure has very high seepage-proofing capacity, the permeability coefficient reaches 1.0*10<-11> cm/s, long-term stability is achieved, erosion can not happen, and the natural aging life is more than 50 years.

The present invention relates to improved bentonite barrier compositions having enhanced low permeability over time in containment applications. Of the many embodiments provided herein, one embodiment includes a geosynthetic clay liner comprising: at least one geosynthetic layer; and a bentonite barrier composition comprising: bentonite and a polyanionic low molecular weight polymer.

The invention discloses a GCL vertical anti-seepage wall and a preparation method thereof. The GCL vertical anti-seepage wall comprises a vertical anti-seepage wall body, wherein a sodium-based geosynthetic clay liner is fixed at the outer side of the vertical anti-seepage wall body, and the sodium-based geosynthetic clay liner comprises a vertical anti-seepage structure and a top fixation structure. The anti-seepage wall disclosed by the invention has a low permeability coefficient, and is good in bonding with a soil mass, and high in anti-seepage effect.

The invention discloses a prehydration-type geosynthetic clay liner and a preparation method thereof. The clay liner consists of shell fabrics, prehydration-type bentonite and base cloth. The preparation method comprises the steps of: mixing natural sodium bentonite, natural high-polymer materials and water so as to prepare prehydration-type bentonite thin sheets, and coating non-woven cloth and knitted cloth on the upper surfaces and the lower surfaces of the prehydration-type bentonite thin sheets. The prehydration-type geosynthetic clay liner provided by the invention is 4.5-5.5kg/m<2> in mass area ratio, 0.55-0.65cm in thickness, and 1m-6m in amplitude, is especially suitable for being applied to seepage-prevention construction of underground engineering of buildings, subways and the like, the seepage prevention of pools, lakes and reservoirs, and the seepage prevention construction of percolate quality at the construction environments of seawater, or refuse landfills and the like under complex conditions, and also can be used as a material for flat or gradient roof surfaces or roofs.

The invention provides a cascading waterfall waterscape structure on an artificial stacked mountain and a construction method of the cascading waterfall waterscape structure, belonging to the field of a garden engineering technology, and aiming at solving the problem that in the existing cascading waterfall waterscape engineering, water leakage is caused due to the settlement of the artificial stacked soil body, so that the quality of the engineering can be influenced. The cascading waterfall waterscape structure comprises a pool body and a riverbed which are connected with each other; the artificial stacked mountain sequentially comprises a base layer, a common planting soil layer and a high-quality planting soil layer from bottom to top, wherein the base layer is built by construction waste which does not contain pollutant and radioactive substances. The construction method comprises the steps of 1, stacking and tamping the base layer, the common planting soil layer and the high-quality planting soil layer of the artificial stacked mountain in a layered way; 2, laying a middle coarse sand cushion layer, a geosynthetic clay liner and a plain concrete cushion layer from bottom to top layer by layer at the position of the pool body to build the pool body; 3, laying a middle coarse sand cushion layer, a geosynthetic clay liner and a plain concrete cushion layer from bottom to top layer by layer to form the riverbed; 4, building a reinforced concrete retaining wall I at the part where the pool body is connected with the riverbed; 5, building at least one reinforced concrete retaining wall II in the riverbed.

The invention discloses a water-proof construction method for connected nodes of a foundation slab and a ground wall in a composite surround system, and relates to the technical field of underground engineering water-proof construction. The water-proof construction method aims at the problems that the interface of a new concrete structure and an old concrete structure and the chiseled portion of a bored cast-in-place pile are prone to forming underground water seepage path, and the construction quality of the foundation slab is influenced. The water-proof construction method comprises that 1, a sunken portion is dug on the edge of a foundation pit, a concrete base layer is constructed, a first geosynthetic clay liner is laid to the bored cast-in-place pile, and closing up is carried out; 2, the foundation slab to be poured and a reinforcing steel bar bracket to be turned downwards are erected and bond, and a space on the edge of the foundation slab to be poured is reserved; the foundation slab is poured, and the bracket is turned downwards; 3, the portions, over the bottom elevation of the foundation slab, of the bored cast-in-place pile and a high-pressure jet grouting pile are chiseled away, and a depth D is dug downwards along the bottom elevation of the foundation slab continuously; a base layer is poured on the chiseled portion and coated by a second geosynthetic clay liner, and closing up is carried out; and 4, after a pouring belt is poured, the pouring belt and the foundation slab are fixedly connected into a whole.

The invention provides a flexible protective material for a geosynthetic clay liner (GCL), which relates to a material for protecting the GCL. The flexible protective material for the GCL of the invention is prepared by mixing the following materials in percentage by weight: 15% of styrene-acrylate emulsion, 40% of quartz sand, 10% of cement, 3-5% of 107 glue and 30-32% of water, wherein the quartz sand is 200 meshes, and the cement is common cement. The preparation method comprises the following steps: firstly, sieving the quartz sand with a sieve of 200 meshes; weighing each material according to the percentage by weight; uniformly mixing the styrene-acrylate emulsion, the 107 glue and the water; then, adding the quartz sand and stirring; and finally, adding the cement and uniformly stirring for later use. The material has good bonding effect with non-woven fabrics of the GCL, simultaneously can keep the flexible characteristic of the GCL, and has good effect on preventing ultraviolet ray aging. The new protective material of the invention effectively solves the problems. The experimental test proves that the anti-aging performance index of the material of the invention is superior to that of cement mortar.

The invention discloses an impervious geosynthetic clay liner, and belongs to the technical field of waterproof coiled materials. The impervious geosynthetic clay liner comprises a woven cloth layer (1), a buffer layer (4), a bentonite layer (2), a buffer layer (4) and a non-woven cloth layer (3) from top to bottom, wherein the bentonite layer consists of the following raw materials of, by weight,80-100 parts of modified bentonite, 10-20 parts of adhesive, and 30-40 parts of water; the adhesive is formed by mixing polyvinyl alcohol solution and water glass; the buffer layer is mixed liquid prepared by dissolving agar and vital gluten into the water; and the mixed liquid is preheated to spray into organic solvent for standing and layering to prepare gel beads. The impervious geosynthetic clay liner achieves excellent characteristic of impervious performance, and is broad in prospect and application value in the field of the waterproof coiled materials.

The invention discloses a hydrophilic polymer modified bentonite composite material and a preparation method and application thereof. The polymer modified bentonite composite material comprises a hydrophilic polymer and sodium modified bentonite, wherein the hydrophilic polymer is one or two of polyanionic cellulose or xanthan gum, and the mass of the hydrophilic polymer is 0.5-10% of the mass ofthe sodium modified bentonite. The preparation method is a dry mixing method or a wet mixing method. The vertical barrier can be used as a vertical barrier of an industrial pollution site, and the seepage prevention performance, the adsorption performance and the migration blocking performance of the vertical barrier under the action of heavy metal/organic pollutant polluted underground water aregreatly improved, the device can also be used for compacting a clay layer in a horizontal blocking system so as to prevent pollutants in a polluted site from infiltrating, and the geosynthetic clay liner can also be used as a raw material of the geosynthetic clay liner to improve the impermeability, adsorption performance and migration resistance of the geosynthetic clay liner. The method has great engineering application potential, can be applied to blocking engineering construction of industrial contaminated sites, and improves the blocking effect.

The invention discloses a step type low elevation greenbelt for purifying surface rainfall runoff. The step type low elevation greenbelt comprises a road shoulder, a high position region and a low position region from inside to outside, wherein the elevation of the road shoulder, the elevation of the high position and the elevation of the low position region are sequentially and gradually decreased. The road shoulder, the high position region and the low position region are connected through a herbal plant belt. The high position region sequentially comprises a planting soil layer I, a coarse sand layer and a gravel layer I, herbal plants are planted on the planting soil layer I, a pipeline is laid in the gravel layer I, and the other end of the pipeline is led to the low position region. The low position region sequentially comprises a planting soil layer II, a fine sand layer, an oxygen slow-release material layer, a gravel layer II and a geosynthetic clay liner, and an overflow opening is formed in the low position region. Herbal plants are planted on the planting soil layer II, and a perforated drainage pipe is laid in the gravel layer II. Water is converged to the overflow opening through the drainage pipe, and the overflow opening is communicated with a rainwater pipe duct. According to the low elevation greenbelt, SS entering the low elevation greenbelt is remarkably reduced, the content of dissolved oxygen in a low elevation greenbelt matrix is increased through an oxygen slow-release material, and the degradation capacity of COD and nitrogen and phosphorus pollutants is enhanced.

The invention provides a high-pressure hydration consolidation retention box device of a geosynthetic clay liner, and belongs to the technical field of geotechnical engineering. The high-pressure hydration consolidation retention box device consists of a framework, a hydration system and a pressurizing system; the geosynthetic clay liner can fully absorb water in a water permeating cylinder to complete hydration by the hydration system through a movable rectangular water permeating cylinder, a detachable water permeating cylinder, a push-out rail of the water permeating cylinder, a limiting support column, a water permeating support grid and a water drain valve; the any positive pressure can be applied to the hydrated geosynthetic clay liner by the pressurizing system through a loading plate, a lever, a force transfer shaft, a balance lever, an n-shaped loading framework, a loading threaded rod, a lever rotary shaft and a water drain valve, so as to complete the consolidation and waterdrainage process under the action of positive pressure. The high-pressure hydration consolidation retention box device has the advantages that the real service condition of the geosynthetic clay liner can reoccur, so as to provide great help for testing the mechanical property of the geosynthetic clay liner by an indoor geotechnical testing method under the actual working condition.

Reactive treatment cells (RTCs) are described in combination with sediment capping systems as a means for environmental remediation. RTCs include an impermeable housing defining an interior, a permeable ceiling and floor typically including filtration materials such as geotextiles, and at least one interior compartment for treatment reagents. One RTC includes a gabion-like cage structure retaining a geomembrane-supported geosynthetic clay liner (GM-GCL) housing, while a second embodiment includes a hard, cylindrical shell as a replaceable reagent cartridge. RTCs may be employed in initial capping system installations or retrofitted into existing capping systems. RTCs may include optional baffles, flow restrictors, floating discs, sensor probes, and two or more serial reagent zones or compartments.

The invention provides a construction method for the overlap joint of geosynthetic clay liners by using a photocuring technology. The method comprises the steps that water-soluble ultraviolet light curable resin and photoinitiator are sprayed on the surfaces of the geosynthetic clay liners in sequence, the photoinitiator is irradiated by using ultraviolet light to trigger the curing of the water-soluble ultraviolet light curable resin, and the overlap joint between the geosynthetic clay liners is achieved. The method is simple in technology and low in cost, the overlap joint can be achieved between the geosynthetic clay liners and other materials and among the geosynthetic clay liners in a construction process by using the photocuring resin, the overlap joint effect is good, and leakage does not occurs easily.

The invention relates to an experiment system for penetration of graphene particles in GCL. The system comprises: a penetration device, wherein the penetration device is a closed container, penetration holes (17) are arranged in the bottom of the closed container, the penetration device is used for containing a graphene particle liquid, and a geosynthetic clay liner GCL (15) is spread on the bottom of the penetration device; a pressurizing device communicating with the penetration device and used for regulating the internal pressure of the penetration device; a collecting device connected withpenetration holes (17) and used for collecting the liquid seeped from the penetration device; and a temperature control device covering the penetration device and used for regulating the internal temperature of the penetration device. Compared with systems in the prior art, the system in the invention can realize the research on the interception effect of the GCL on the graphene under the actionof the upper pressure, the temperature, the initial graphene concentration, the ionic strength, the organic matter content and the pH value, and is of great significance to studying the graphene interception performance.

Described herein is a composition for use in a geosynthetic clay liner, the composition comprising particles, at least some of which are discrete particles and each comprise: a compacted swelling clay, the clay having been compacted such that it at least partially surrounds a fluid-loss preventing polymer. Also described herein is a clay liner formed from the composition, a method for producing particles for use in a geosynthetic clay liner, and a method of forming a clay liner.