449 results about "Soil material" patented technology

The invention relates to the technical field of tunnel engineering, and discloses a tunnel multi-field coupling nonlinear deformation analysis method and system.The method comprises the steps that geological environment information of a tunnel area is collected, a multi-source physical field boundary condition model is built based on collected data, and a heat-seepage-stress-time four-field coupling control model is built based on the collected data; specifying a nonlinear response model for the geological medium to truly reflect the stress-strain behavior of the geotechnical material; solving a coupling equation set, and optimizing the four-field coupling control model; introducing measured data to correct the model; the system comprises a geological data acquisition module, a boundary condition modeling module, a coupling model establishment module, a numerical solution module, a measured data correction module and a visual output and control interface module. According to the method, high-fidelity prediction and evolution analysis of the deformation behavior of the tunnel under the complex geological condition are realized based on comprehensive acquisition of the geological environment, multi-field boundary modeling, control equation construction and numerical calculation.

The invention provides a flow-state solidified soil mixing construction method based on automatic adjustment of proportioning parameters, belongs to the technical field of flow-state solidified soil, and realizes intelligent control of a flow-state solidified soil mixing process by establishing a three-section type precise screening and stirring system and a high-precision automatic control system. According to the method, firstly, target performance parameters are input, and an optimal matching scheme is automatically selected through a multi-target optimization algorithm; starting an original soil treatment unit to perform soil material dispersion treatment and measuring the physical characteristics of the soil material; adding the raw materials according to the accurate measurement, and fully mixing; when it is detected that the performance of the mixture deviates from a target value, the system automatically triggers a parameter compensation mechanism for adjustment; and meanwhile, a material ratio fluctuation early warning system is established, so that uneven mixture quality caused by starting and stopping of equipment or material conveying delay is avoided, and the technical problem that in the prior art, matching parameters are difficult to accurately regulate and control in real time in the mixing process of the flow-state solidified soil is solved.

The invention is suitable for the technical field of rock grouting reinforcement, and relates to a visual crossed fracture flowing water grouting test device and method. A transparent soil material with soil force properties and hydraulic properties similar to those of natural soil such as an internal friction angle, a deformation characteristic and a flow boundary effect is adopted; the water flow and slurry flowing state in an actual stratum can be truly simulated, and the accuracy of a test result is remarkably improved; by means of the layered water injection design of the soil filling box, comprehensive observation of the grouting behavior rule of cross fractures in stratums in different water saturation states is achieved, and the influence of complex hydrological conditions on the grouting effect is effectively reproduced; and a tracer agent with observation advantages is introduced in the grouting process, so that the visual observation capability on the slurry diffusion path, the slurry diffusion range and the flow velocity change is greatly enhanced. According to the method, the diffusion path, the expansion range and the grouting effect of the grout in a deep crack and a large model can be visually observed, the grouting effect is greatly improved, and a scientific basis is provided for optimizing the grouting process and predicting the grouting effect.

The invention provides a gel material, an industrial solid waste solidified immature soil material containing the gel material and a preparation method of the industrial solid waste solidified immature soil material, and belongs to the technical field of building materials.The industrial solid wastes such as desulfurized gypsum, carbide slag, slag powder and red mud are used for forming a full-solid-waste gel system, and the full-solid-waste gel system is mixed with immature soil, a water reducing agent and water; the high-flow-state and high-performance industrial solid waste solidified raw soil material suitable for pouring construction can be prepared on the premise of not additionally introducing an additive through a two-step method of ageing coating and stirring. The industrial solid waste solidified immature soil material has the advantages of being good in workability, high in mechanical property, good in durability, environmentally friendly, low in cost and simple in preparation process, use of the industrial solid waste solidified immature soil material in areas with relatively short resources and relatively backward economy is promoted, and the industrial solid waste solidified immature soil material can be used for treating engineering slurry and is applied to filling projects such as pipe galleries, temporary ground hardening and roads.

The utility model belongs to the technical field of carbon molecular sieve production equipment, and discloses a flower mud material crushing conveyor line which comprises crushing equipment, a bottom belt conveyor, an inclined lifting belt conveyor and a vibrating screen, a sunken main pit is formed in the workshop ground of a flower mud crushing station, the crushing equipment is installed in the main pit, and the inclined lifting belt conveyor is installed in the main pit. A feeding hopper of the crushing equipment is removed towards the outer side wall, and the bottom of the feeding hopper is connected through a horizontal steel plate, extends and is connected to the workshop ground in a lap joint mode. The bottom belt conveyor is horizontally connected below a discharge port of the crushing equipment, the bottom end of the inclined lifting belt conveyor is connected at the discharge end of the bottom belt conveyor, and the high end of the inclined lifting belt conveyor inputs crushed flower mud materials to a feed port of the vibrating screen. According to the flower mud material crushing conveying line, crushing equipment is installed in a pit mode, the feeding difficulty is lowered, and the operation safety is improved.

The invention relates to a method for operating a grab system, comprising a carrier device and a cable grab arranged thereon, which cable grab comprises a grab frame, which is held by a retaining cable on the carrier device, at least two grab buckets, which are mounted on a lower end of the grab frame, so as to be able to swivel between a closed position and an open position, and an actuating device with an actuating cable for swivelling the grab buckets, wherein an actuating cable is guided from the carrier device to the actuating device, and the carrier device has a driven first cable winch for the retaining cable and a driven second cable winch for the actuating cable, wherein the carrier device has an undercarriage and an upper carriage, which is mounted thereon for rotation about a vertical axis and has a cantilever arm on which the cable grab is vertically adjustably mounted, wherein in a removal step, in order to form a trench in the ground, the cable grab is lowered into the ground by the retaining cable with the grab buckets open, the grab buckets are closed to remove and collect soil material, the cable grab is pulled out of the ground by the retaining cable and swiveled to an emptying position, in which the grab buckets are opened to discharge the collected soil material, by rotating the upper carriage, and then the cable grab is moved back into the ground trench to repeat the removal step. In accordance with the invention, a control device is provided with which a rotation of the upper carriage to the emptying position and an opening and closing of the grab buckets to discharge the soil material or a rotation of the upper carriage from the emptying position back to the ground trench are controlled automatically.

The pipeline backfilling equipment comprises a shell, the top of the shell is open, a filtering assembly is arranged at the open position of the top of the shell, and the filtering assembly is used for filtering soil materials entering the filtering assembly, dividing the soil materials into small particles and large particles and discharging the soil materials with the small particles and the large particles separately. One side of the shell is connected with the vehicle body, and the shell is driven by the vehicle body to advance above a pipe ditch; the feeding device is arranged on one side of the shell; the soil filling assembly is used for receiving the discharged small-particle soil materials and the discharged large-particle soil materials; and the compaction roller is arranged at the bottom of the shell. According to the device, soil materials can be sequentially subjected to feeding, filtering, feeding and compacting treatment, multiple vehicles do not need to be matched for construction, the construction efficiency and convenience can be effectively improved, and after the soil materials are filtered, only fine particles can make contact with a pipeline, so that the pipeline cannot be damaged during subsequent compacting and normal use.

The invention relates to the technical field of geotechnical material local modeling, in particular to a geotechnical material data driving local modeling method and device based on a knowledge migration strategy, and the method comprises the steps: building a first mapping data pair based on the stress-strain physical quantity of a test curve sampling point, and building a high-fidelity data set of a geotechnical material; constructing a second mapping data pair based on the stress-strain state of the simulation curve sampling point and the intermediate physical quantity label, and establishing a low-fidelity data set of the geotechnical material; pre-training the target data-driven constitutive model by using the low-fidelity data set to generate an initial geotechnical material data-driven constitutive model; and driving the model to be fine-tuned by using the high-fidelity data set for the initial geotechnical material data, and generating final geotechnical material data to drive the model. Therefore, the problem of insufficient generalization ability and prediction precision of a data-driven model due to limited training data and unpredictability of a stress path in the prior art is solved.

The invention discloses a test platform and a test method for simulating lunar soil penetration in a low-gravity environment based on bottom friction, and belongs to the technical field of low-gravity simulation devices. Simulated lunar soil is placed in the simulation box; the simulation box is arranged on the support adjusting unit; wherein the inclination angle of the simulation box is adjusted by adjusting the length of the support adjusting unit, so that the gravity of the moon is simulated; the monitoring unit penetrates through the simulation box and then penetrates into the simulated lunar soil, and the penetration resistance in the simulated lunar soil is monitored. The low-gravity environment of the moon can be simulated, and the low-gravity environments of other planets can also be simulated by applying the method principle provided by the invention; meanwhile, the method provided by the invention can be used for calculating the inclination angle alpha of the corresponding test bed according to different lunar soil or star soil materials (the friction coefficients mu of different materials are different).

The invention belongs to the technical field of fluid curing. The liquid-state light-weight anti-seepage solidified soil is characterized by comprising flow-state solidified soil slurry and light-weight foamed concrete, the volume ratio of the flow-state solidified soil slurry to the light foamed concrete is 1: 1; the flow-state solidified soil slurry comprises a soil material, a curing agent and water, and the weight ratio of the soil material to the curing agent to the water is 1150: 80: 228; the light foamed concrete comprises water, cement and a foaming agent; the weight ratio of the water to the cement to the foaming agent is 150: 250: 2.24. The technical problem that backfill soil around an existing building foundation collapses is solved. The invention further discloses a preparation method of the liquid light anti-permeability solidified soil. The invention further discloses a construction method of the liquid light anti-permeability solidified soil.

The invention relates to a trench cutter comprising a box-shaped housing, on the upper face of which a lifting apparatus can be mounted, at least one cutting wheel, which is arranged on a lower face of the housing and can be driven in rotation to remove soil material, wherein cutting teeth are arranged along the outer circumference of the cut-ting wheel at least one circumferential row, which at least one axial clearance adjoins, and at least one clearing plate, which is arranged to be fixed relative to the housing and engages in the at least one circumferential clearance on the cutting wheel to clear away soil material. According to the invention, it is provided that the at least one clearing plate is mounted on a plate holder so as to be spaced apart from the housing, wherein a passage is formed between the at least one clearing plate and the housing, through which passage soil material that has been cut out during operation can be guided upwards.

The invention relates to the technical field of slope engineering parameter inversion, in particular to a rock-soil mass parameter probability inversion analysis method based on constrained Bayesian updating, which comprises the following steps: determining prior distribution of slope rock-soil mass parameters, and constructing a slope monitoring data likelihood function; constructing a target constraint likelihood function according to the target constraint condition; combining prior distribution, a slope monitoring data likelihood function and a target constraint likelihood function by using a Bayesian theory to determine posterior distribution of rock-soil body parameters, thereby determining equivalent samples of the rock-soil body parameters by using a target sampling algorithm, and updating reliable indexes of a target slope by using the equivalent samples, thereby improving the reliability of the target slope. And obtaining the updated slope reliability index. Therefore, the problems that the traditional Bayesian inference in the related technology is mainly used for inverting the geotechnical material parameters by fusing the monitoring data, and when the types and the number of the monitoring data are limited, the traditional Bayesian inference is often uncertain, the inversion stability is poor, and the uncertainty of the geotechnical material parameters cannot be effectively reduced are solved.

The invention discloses an earth rock cofferdam construction method which comprises the steps that S1, a riverbed or a foundation of a cofferdam construction area is surveyed, a surface soft soil layer is cleaned till a solid soil layer or a rock layer is exposed, a groove is formed in the cleaned area according to the design requirement, and geotextile is laid in the groove, s2, stone and soil which are hard in texture and good in grading are prepared, a bottom waterproof layer is arranged, soil and stone are filled according to a layering method, the thickness of each layer is controlled to range from 30 cm to 50 cm, after each layer of soil and stone is filled, a road roller or a vibration roller is used for compaction, the compaction degree meets the design requirement, slope protection materials are laid on the slope surfaces of the inner side and the outer side of the cofferdam correspondingly, and the slope protection materials are laid on the slope surfaces of the inner side and the outer side of the cofferdam; the inner side slope surface is formed by splicing concrete precast blocks, and a gabion net is arranged on the outer side slope surface; according to the construction method of the earth rock cofferdam, the safety of a construction area is improved, materials used for cofferdam construction can be obtained locally, for example, soil materials and stone materials can be efficiently utilized, and the material transportation and purchase cost is reduced.

The invention relates to the field of flow-state solidified soil testing devices, and particularly discloses an offshore wind turbine flow-state solidified soil anti-dispersion and anti-scouring integrated testing device which comprises a reservoir, an anti-dispersion testing mechanism and an anti-scouring testing mechanism. The anti-dispersion test mechanism is a transparent cuboid groove, a water outlet in the tail end of the anti-dispersion test mechanism faces an inner cavity of the water storage tank, a concave test groove formed in the bottom face of the cuboid groove is formed in the inner side of the water outlet, and the head end of the cuboid groove is in circulating connection with the water storage tank through a pump body. The anti-scouring test mechanism comprises a reducing pipe, a horizontal flow pipe, a test piece pipe, a guide plate, a loading cylinder, a screw rod, a driving motor and a range finder. The testing device can accurately simulate the high-speed water flow environment around a fan pile, and meanwhile, the anti-dispersion and anti-scouring performance test of the flow-state solidified soil and the coupling test device of an offshore fan are carried out, so that more scientific and reliable technical support is provided for research, development and test of the material of the flow-state solidified soil.

The invention relates to the field of solidified soil, and particularly discloses alkaline residue light solidified soil and a roadbed construction method thereof. The alkaline residue light solidified soil comprises the following components in parts by mass: 40-50 parts of alkaline residue, 30-40 parts of soil material and 10-30 parts of fly ash, the roadbed construction method comprises the following steps: adding water into the alkaline residue light solidified soil, stirring to enable the water content in the alkaline residue light solidified soil to be 27-31%, paving the alkaline residue light solidified soil at a preset position for roadbed construction, respectively filling the two sides of the paved alkaline residue light solidified soil with edge covering soil with the thickness of more than 1m, and adopting clay with the plasticity index of 10-20 as the edge covering soil, and after completion, compacting and maintaining the paving area to obtain the alkaline residue light solidified soil roadbed. The alkaline residue light solidified soil has the advantage that the long-term durability of an alkaline residue solidified soil roadbed is improved.

The invention relates to the technical field of geotechnical engineering intelligence, in particular to a multi-field coupling intelligent triaxial test method and system combined with machine learning, and the method comprises the following steps: initializing a test device, and establishing a material parameter prior distribution function; defining a target test path and obtaining a target control sequence; acquiring real-time test data through a multi-source fusion sensing array, and preprocessing the real-time test data to obtain multi-dimensional feature fusion data; establishing an online parameter identification module to obtain real-time correction material parameters; establishing a heat-water-force multi-field coupling prediction model to obtain an optimal control sequence; acquiring latest test data, and performing rolling optimization on the model to establish a lightweight control model; and generating an intelligent control instruction to realize self-adaptive intelligent control of the triaxial test. According to the invention, through combination with machine learning, the spanning of the triaxial test from experience control to intelligent control is realized, and an intelligent technical means is provided for the research of the multi-field coupling characteristic of the geotechnical material.

The invention relates to the technical field of rock-soil and deep underground space engineering monitoring, in particular to an in-situ engineering rock mass information advanced sensing system which comprises a sensing pipe which is of a tubular structure and used for stretching into a hole to sense and monitor the hole. The sensing pipe comprises a power excitation mechanism, an in-situ echo elastic wave acquisition mechanism, an autonomous walking mechanism and a visual sensing mechanism; the power excitation mechanism comprises a first driving unit and an excitation unit, and when the excitation unit abuts against the inner wall of the hole, the excitation unit can knock the inner wall of the hole and is used for providing an impact signal with adjustable power for the inner wall of the hole; according to the invention, sound waves generated by the power excitation mechanism are utilized to test and analyze rock and soil materials, so that the problems that the existing device is single in test index and cannot comprehensively monitor and evaluate internal information of a rock mass are solved.

The invention is applicable to the technical field of road construction, and provides a digging and filling method for highway subgrade construction, which comprises the following steps: T1, carrying out construction operation according to a construction drawing, digging a pavement through a digging machine to form a groove, and piling dug soil on the ground on two sides of the groove; t2, the grooves are evenly filled with filling materials such as stone, coal cinder and gravel; t3, the road roller is controlled to slowly move along the foundation pit, a soil returning device at the front end of the road roller is used for backfilling soil on the two sides of the foundation pit, and a compaction steel wheel at the rear end of the road roller is used for compacting the backfilled groove; the soil returning device comprises a fixing assembly and a backfilling assembly arranged on the fixing assembly in a sliding mode. According to the method, the rotating shaft is controlled to rotate to drive the two sets of spiral conveying blades with opposite spiral directions to synchronously rotate, most of soil on the two sides of the groove is conveyed into the groove, the two sets of bulldozing plates are driven to push the residual coating into the groove through linkage of all the parts, and the backfilling efficiency is improved.

The invention provides a method for adjusting the moisture content of a tackified soil material yard, and belongs to the technical field of water conservancy and hydropower engineering construction. Calculating the unit water supplementing amount required by the unit volume of cohesive soil in each partition; calculating the total water supplementing amount required by the cohesive soil in each subarea; the number of water supplementing pits in each partition is determined; a plurality of water replenishing pits are uniformly arranged in each subarea; and the multiple arranged water supplementing pits are filled with water, mining is carried out after the water supplementing pits are placed for 2-5 days, mixing is carried out while mining is carried out, and the mixture is loaded and transported to a filling site after uniform mixing. According to the method, the water supplementing pit is arranged in situ in the mining material field, blending is carried out while mining is carried out, the uniformly-blended cohesive soil is directly loaded and transported to the filling field for use, the construction procedure is simple, a temporary soil material stacking field does not need to be additionally developed, secondary soil material transferring is not needed, and the treatment cost is saved; and the moisture content of the soil material increased by the method is close to the optimal moisture content, the humidity is uniform, and the quality of the soil material can be effectively improved.

The invention discloses a transparent soil vibration table pile type reinforced embankment working property simulation method, and relates to the technical field of geotechnical engineering. In order to solve the problem of internal visualization of working properties of an existing pile-supported reinforced embankment, the following technical scheme is provided: S1, adjusting and fixing a slope simulator; s2, realizing transparency of a soil body material; s3, filling a transparent reinforced embankment; s4, installing and fixing observation equipment; and S5, simulating rainfall, earthquakes and train loads. The transparent soil vibration table pile type reinforced embankment working property simulation method and scheme have the remarkable beneficial effects in the aspects of internal visual simulation, controllability and reducibility, instrument operation simplicity and convenience, comprehensive benefits and the like.

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.

To provide a method for effectively solidifying a soil-based material.SOLUTION: A method for solidifying a soil-based material includes: a solidifying agent preparation step for preparing a solidifying agent containing casein, calcium ions, carbonate ions, urea, and urease; and a soil-based material solidification step for contacting the solidifying agent with the soil-based material to solidify the soil-based material.SELECTED DRAWING: Figure 5

The invention relates to the technical field of roadbed materials, and provides a Bayer process red mud roadbed material and a preparation method thereof.The Bayer process red mud roadbed material is prepared from, by weight, 100 parts of Bayer process filter pressing red mud, 1-30 parts of modified fly ash, 50-150 parts of a soil material, 2-10 parts of an accelerant and 0.01-0.8 part of a dispersing agent; wherein the modified fly ash is prepared from the following raw materials: fly ash, a silane coupling agent and 4-(2-hydroxyethoxy) benzaldehyde, and through the technical scheme, the problem that the Bayer process red mud roadbed material in the prior art is low in impermeability and mechanical property is solved.

The invention discloses a reservoir dam body stability monitoring method and device and a medium, and belongs to the technical field of dam monitoring. The method comprises the steps that basic size parameters and layered soil material parameters of a dam body in a design drawing are obtained; processing the data based on an infiltration analysis model to generate a dam body cross-section diagram and a layered soil structure model; processing the layered soil structure model through an infiltration line generation algorithm, and generating an early warning infiltration line; marking a real-time water level point in the dam body cross-section diagram according to the dam body water level data, and generating a real-time infiltration line; comparing the real-time infiltration line with the early-warning infiltration line to calculate a deviation distance between the real-time infiltration line and the early-warning infiltration line; if the deviation distance exceeds the safety threshold value, an alarm signal is triggered, and a dam body stability evaluation report is generated and transmitted to a preset terminal. Through the method, whether the dam is stable or not can be judged according to simple data.

The invention discloses a preparation device and method for flow-state solidified soil, the preparation device comprises a stirring assembly (4) arranged on a high-pressure water source output port and a mixing assembly (3) arranged between the high-pressure water source output port and the stirring assembly (4), through the stirring assembly (4), stirring and mixed powder wet treatment is carried out on a soil material, a curing agent and an additive, and through the mixing assembly (3), the soil material, the curing agent and the additive are subjected to wet treatment. According to the invention, mixing treatment of a soil material subjected to wet treatment of mixed powder, a curing agent and an additive in a water flow state environment is realized, preparation of flow-state solidified soil is realized in mixing treatment of a high-speed double-hedging component, and the technical problem that solidified soil mixing is realized by using a concrete mortar mixer truck is solved; therefore, the preparation effect of the solidified soil is improved.

The invention provides flow-state solidified soil for embankment reinforcement and a reinforcement method of the flow-state solidified soil, and belongs to the technical field of embankment reinforcement. The flow-state solidified soil for reinforcing the embankment comprises a soil material, cement, a microbial agent, a nutrient source, an additive and water, wherein the weight percentage of the soil material is 55%-68%, the weight percentage of the cement is 10%-16%, the weight percentage of the microbial agent is 1%-2%, the weight percentage of the nutrient source is 1%-2%, the weight percentage of the additive is 0-1.0%, and the weight percentage of the water is 20%-25%. The flow-state solidified soil provided by the invention has high mechanical property, high stability and corrosion resistance, can realize ecological solidification of an embankment soil body, remarkably improves the mechanical property and stability of the embankment soil body, and effectively controls the problems of roadbed corrosion and differential settlement.

The soil carbonate content measuring device comprises a box body and a screening assembly, the screening assembly comprises a discharging port formed in the top end of the box body, a V-shaped plate is fixedly connected into the box body, two filter grooves are formed in the V-shaped plate, the two filter grooves are evenly distributed on the two sides of the V-shaped plate respectively, and the two filter grooves are not communicated; a sliding frame is slidably clamped at the bottom end of one side of the V-shaped plate, a plurality of push blocks are arranged at the top end of the sliding frame, each push block is slidably clamped in one filter tank, a supporting arm is arranged on the outer side of the box body, a clamping block is connected to the inner side of the supporting arm through a telescopic rod, a guide block is arranged on one side of the sliding frame, and the clamping block is clamped on the outer side of the guide block; the screening assembly and the metering assembly arranged in the device can be used for pretreating soil to be tested, on one hand, impurities such as stones and branches in a soil material can be removed, on the other hand, the content of carbonate in the soil can be preliminarily measured, and then the experiment time of operators is saved.

The invention relates to the technical field of geotechnical engineering and geological disaster prevention, in particular to a method for testing and predicting a retaining wall of a soil-rock mixture high landfill. The method comprises the following steps: S1, sample preparation: determining soil materials with different maximum particle sizes by adopting a rejection method, a similar gradation method and an equivalent substitution method according to a field soil material gradation curve of the soil-rock mixture; s2, large-scale direct shear test: performing direct shear test on each group of samples prepared in the step 1 by using a direct shear apparatus, and determining the shear strength of each sample. According to the method, the stability of the soil-rock mixture high landfill site can be improved, indoor tests, physical models, discrete element simulation and theoretical analysis are integrated, the stability influence main cause and the instability mechanism are accurately recognized, effective prevention and treatment measures are provided, a scientific basis can be provided for safety risk assessment and site selection optimization of the stockpiling site, and the method is suitable for popularization and application. And the land reclamation technology is combined, engineering safety and environment harmony are ensured, and remarkable social and economic benefits are achieved.

The dam body structure suitable for the aeolian sand area comprises a dam body, a dam crest, an upstream side dam, a downstream side dam and a pile foundation, the dam body is a dispersive soil material area, a modified dispersive soil material area is arranged on the surface of the dam body, the upstream side dam comprises an anti-seepage structure, and the downstream side dam is provided with a downstream protection slope; a concrete tooth wall is arranged at the bottom of the upstream side dam, a wave wall is arranged at the top of the upstream side dam, a mattress drainage body and an arris drainage body are arranged at the bottom of the downstream side dam and connected with each other, inverted filter layers are arranged between the mattress drainage body and the dispersive soil material area and between the arris drainage body and the dispersive soil material area, and seepage stopping grooves are formed in the pile foundation along the axis of the dam body. The modified dispersive soil materials are arranged on the periphery of the dispersive soil material area of the dam body so as to protect the dispersive soil materials, the crack is sealed through the anti-seepage structure so as to perform anti-seepage treatment on the upstream, and the inverted filter layer is arranged so as to achieve the functions of inverted filtration and drainage. The inverted filter layer is compact and hard in texture, resistant to weather, continuous in grain composition and good in drainage performance and permeation stability.

The invention relates to the technical field of soil material filtering and screening, in particular to screening equipment for soil material multi-stage filtering, which comprises a screening box, a screening barrel for filtering and screening soil materials is arranged in the screening box, and a first screening disc for primarily screening the soil materials is movably arranged at the top in the screening barrel; a first screening disc for conducting multi-stage screening on soil materials is movably arranged at the bottom of the interior of the screening barrel, a second screening disc for conducting multi-stage screening on the soil materials is movably arranged at the bottom of the interior of the screening barrel, and a fixing barrel for driving the first screening disc and the second screening disc to conduct twisting and rotating motion is connected to the center of the interior of the screening barrel through a supporting plate. Soil materials turn over while moving left and right in the first screening disc, the screening effect of the soil materials is improved, the swinging arc-shaped scattering plate is used for scattering the soil materials in the twisting process, the screening efficiency is stably and effectively improved, the first screening disc and the scattering rods form cross movement in the same plane, and the screening efficiency is improved. Soil scattering and soil screening are ingeniously combined into a whole.