174 results about "Soil column" patented technology

The invention discloses a testing device and a testing method for a permeability coefficient characteristic curve of wicking geotextile, and belongs to the technical field of permeability coefficient testing. A to-be-tested wicking geotextile and a soil layer are laid between an upper plate body and a lower plate body of a test unit of the test device; the two sealing covers are located at the two ends of the upper plate body and the two ends of the lower plate body respectively. Each of the first hollow column and the second hollow column comprises a hollow column section positioned above the upper plate body and below the lower plate body, the hollow column sections distributed up and down are communicated with a gap between the upper plate body and the lower plate body, and each hollow column section is filled with a soil body and forms a test soil column; the load output end of the load applying unit is used for applying a vertical load to the top of the test soil column and the upper plate body. The test device disclosed by the invention can really simulate the occurrence condition of the wicking geotechnical cloth in the roadbed engineering; the testing method based on the testing device can rapidly test the permeability coefficient of the wicking geotextile, and a characteristic curve of the permeability coefficient of the wicking geotextile is obtained.

The invention discloses a soil column porosity dynamic inversion system and method and a sensor array structure, and belongs to the technical field of environmental soil tests. The system comprises a test soil column system; the acoustic monitoring module is used for acquiring ultrasonic travel time and amplitude information in the soil column; the resistivity monitoring module is used for acquiring resistivity information in the soil column; and the data processing host receives data of the acoustic monitoring module and the resistivity monitoring module, executes a joint inversion algorithm based on a rock physical coupling model, and dynamically inverts spatial distribution and time evolution of the three-dimensional porosity in the soil column by constructing a target function containing ultrasonic travel time / amplitude data and resistivity data at the same time. According to the invention, real-time, three-dimensional, high-resolution and high-adaptability soil column internal structure monitoring can be realized, and solid data support is provided for environmental rock and soil pollution migration mechanism research and restoration effect evaluation.

The present invention relates to the technical field of soil column water seepage models. Disclosed are a multifunctional soil column model device and a using method. According to the multifunctional soil column model device and the using method, by extending an electric push rod, a pressing plate moves downward to approach the soil; as one end of each rope is connected to a fixing plate, rope reels are enabled to release the corresponding ropes and rotate, a rotating shaft drives cams to rotate, and the cams and pulleys compress each other to move and drive, in cooperation with first springs, a fixing sheet to shake in a reciprocating mode, so that the fixing sheet drives, by means of a second spring, a threaded disc and the pressing plate to vibrate in a reciprocating mode, the pressing plate advances downward in a vibrating mode, and the pressing plate makes contact with the soil and maintains vibration to perform compaction operation, thereby improving the soil compaction quality, better simulating subgrade soil, and enhancing experimental accuracy; moreover, by assembling multiple model barrels for use, experimental data at different heights can be simulated, and by means of assembly, the space occupied by model barrels can be reduced, thereby facilitating transportation.

The utility model relates to the technical field of rare earth resource exploration, in particular to a comprehensive measuring device for hydraulic parameters and various electric responses, which comprises a constant-pressure water supply component, an adjusting valve, a measuring soil column container, a collecting and measuring component, a pressure sensor, a recorder and an electric response measuring instrument. The soil column measuring container comprises a container main body, a microporous baffle plate, two current electrodes and two measuring electrodes, the water inlet end and the water outlet end of the constant-pressure water supply assembly are respectively communicated with the container main body through pipelines, and the storage and collection assembly is arranged on the pipeline between the water outlet and the constant-pressure water supply assembly; a sample cavity between the two microporous baffles in the container main body is used for filling a sample; the adjusting valve is used for adjusting the flow; the pressure sensor, the collecting and measuring assembly, the measuring electrode and the current electrode are used for measuring hydraulic parameters and flowing electric response. According to the utility model, the hydraulic parameters and various electric responses of the sample can be accurately measured, and the electric responses under different hydraulic conditions can be measured.

The invention relates to the technical field of soil body tests, in particular to a sectional type full-automatic soil column temperature control system and method based on soil body temperature control. The system comprises a temperature control module, a model cavity, a rainfall simulation module and a measurement module, the model cavity comprises a container, a blocking net and a soil column, drainage holes are formed in the bottom of the container, the blocking net is laid on the inner side of the bottom of the container, the container is filled with soil, the soil column is evenly divided into multiple layers of soil layer structures with the same thickness, and the contact faces between soil layers are stricken off. The container is provided with an overflow port at a position higher than a specified height of the surface of the soil column, the rainfall simulation module provides rainfall to the surface of the soil column, the measurement module is butted with the soil column and the overflow port to collect soil column data, and the temperature control module controls the temperature of the soil column. According to the device and the method, the aim of accurately controlling the temperature at different depths of the soil column is fulfilled, so that the requirement of researching the seepage characteristics of the plant-green soil covering layer under different temperature conditions is met.

The invention belongs to the field of soil environment pollution simulation and prediction, and provides a prediction method based on a two-point chemical unbalanced model, which is used for quantitatively evaluating the effect of regulating and controlling the migration behavior of p-nitrophenol in acid red soil by straw stalk biochar. According to the method, a biochar-red soil composite medium system is constructed, a soil column leaching experiment is carried out to obtain penetration curve data, a two-point chemical unbalance model in CXTFIT software is utilized to carry out parameter inversion, and key parameters such as a retardation factor, a two-region distribution coefficient, a mass transfer coefficient and a liquid phase degradation coefficient are accurately identified. Model verification shows that the goodness of fit is high, and a parameter change rule reveals the inherent mechanism of enhancing the pollutant retention capacity, changing the proportion of fast and slow adsorption sites and influencing mass transfer kinetics by the biochar. Based on the verified model, the long-term migration behavior and pollution risk of p-nitrophenol under different environmental conditions can be simulated, and a scientific basis is provided for groundwater pollution control and remediation strategy optimization.

The invention discloses a shield tunnel stratum type identification method and device and a program product, and belongs to the technical field of shield tunnels, the method comprises the steps that exploration parameters and shield parameters of a target stratum slice are acquired, and the target stratum slice is obtained by slicing a target soil column located in a shield tunnel area; feature extraction is carried out on the shield parameters to obtain shield parameter features of the target stratum slice, and the shield parameter features indicate the stratum strength of the target stratum slice; type feature extraction is carried out according to the exploration parameters of the exploration hole soil column adjacent to the target stratum slice, the stratum type feature of the target stratum slice is obtained, the stratum type feature indicates the distribution condition of the stratum type of the exploration hole soil column adjacent to the target stratum slice, and the exploration hole soil column is located in the shield tunnel area; and inputting the shield parameter characteristics, the stratum type characteristics, the exploration parameters and the shield parameters into a stratum type identification model to obtain the stratum type of the target stratum slice. According to the invention, the stratum type identification precision is improved.

The invention discloses a mountainous area surface matrix physical property prediction method, and relates to the technical field of geological exploration, and the method comprises the steps: obtaining mountainous area surface point cloud data, separating vegetation from ground points through a point cloud classification algorithm, and generating a digital elevation model and a digital surface model; based on the digital elevation model and the digital surface model, a quantum gravity gradiometer is adopted to move along a contour line for measurement, a gravity gradient tensor is obtained, terrain interference signals are eliminated, and a vertical density profile is obtained through inversion; identifying a density abnormal region according to the vertical density profile, acquiring an undisturbed soil column sample by adopting a drilling unit, determining a grain composition and moisture characteristic curve, performing DNA extraction and microorganism sequencing on the undisturbed soil column sample, and calculating the relative abundance of the nitro spirillum phylum. According to the method, the dynamic coupling model is constructed through fusion of quantum gravity gradient measurement and microbiological omics data, and the problem of insufficient vertical density-permeability coefficient coupling modeling precision of a traditional method is solved.

The invention belongs to the field of soil dissolved organic matter analysis, and provides a multispectral-based DOM detection and reclamation influence evaluation method, which comprises the following steps: step 1, collecting dry farmland soil samples of different reclamation years, and obtaining soil column samples of a plough layer, a plow pan and subsoil; 2, extracting, centrifuging and filtering the soil sample to obtain a DOM solution; 3, detecting the DOM solution by adopting an ultraviolet-visible absorption spectrum; step 4, adopting a three-dimensional fluorescence spectrum and combining parallel factor analysis to obtain fluorescence components and source characteristics of the DOM solution; step 5, analyzing molecular composition and characteristic parameters of the DOM solution by adopting solid-phase extraction in combination with Fourier transform ion cyclotron resonance mass spectrometry; and step 6, based on the detection data in the steps 3-5, evaluating the influence of reclamation years on the composition, structure and degradation characteristics of the DOM. According to the method, multi-dimensional detection of soil DOM is realized through a multi-spectrum and mass spectrum combined technology, and DOM is comprehensively analyzed from a macrostructure to molecular composition.

The invention discloses a method, system, equipment and medium for predicting regional soil moisture, and relates to the technical field of soil moisture diagnosis and prediction.The method comprises the steps that a regional surface soil moisture model driven by unmanned aerial vehicle data is established through a random forest algorithm on the basis of unmanned aerial vehicle multispectral data and in-situ data synchronously collected on the ground; dividing a research area plane into a plurality of grids, regarding each grid as a one-dimensional vertical soil column, and predicting the surface soil moisture content of each grid by using the trained area surface soil moisture model; and for one-dimensional soil columns of all grids, by utilizing an ensemble Kalman filtering method, the predicted surface soil moisture of the grids is regarded as observation and independently and synchronously assimilated into a one-dimensional vertical soil moisture physical model of the grids, so that a regional quasi-three-dimensional soil moisture prediction model jointly driven by the multi-spectral data of the unmanned aerial vehicle and the physical model is formed. Therefore, accurate prediction of soil moisture at any space-time node in the research area is realized.

The invention provides a device for simulating the vertical migration rule of oil and gas field ground pollutants and a simulation method, and relates to the technical field, the device comprises a soil column leaching module, a spraying module and an underground water control module, the soil column leaching module and the underground water control module are both arranged in an underground foundation pit, and the soil column leaching module comprises a soil column experiment device; a sensor device is inserted into the soil column experimental device, the sensor device is electrically connected with the data acquisition device, the soil column experimental device is provided with a soil sampling window, the spraying module comprises a spraying pipe, one end of the spraying pipe is communicated with the reservoir, and the other end of the spraying pipe extends above the soil column experimental device. On the basis that only surface water is concerned to drive pollutant migration originally, the underground water control module and the water supply Markov bottle are additionally arranged, and fluctuation of the underground water level can be achieved; long-term and continuous in-situ monitoring of soil moisture in-situ data can be achieved in real time, non-destructive collection of samples can be achieved, and the research quality of the vertical migration rule of oil and gas field ground pollutants is improved.

The utility model relates to a sampling device for paddy field deep soil in an irrigation period, and relates to the technical field of soil sampling devices. The sampling device for the deep soil of the paddy field in the irrigation period comprises a cylinder body, a soil column cutting part and a bulldozing device, wherein a sampling hole penetrating through the two ends in the axial direction of the cylinder body is formed in the cylinder body; an overflow port communicated with the sampling hole is formed in the upper end of the cylinder body or the side wall close to the upper end; an inserting channel is formed in one side of the cylinder body, and the soil column cutting-off piece comprises a connecting part and a cutting-off shovel fixedly connected to the end of the connecting part; the cutting shovel can penetrate through the insertion channel to be inserted into the sampling hole and is used for cutting the soil column in the sampling hole; the bulldozer comprises a push rod and a piston push block fixedly connected to the end of the push rod, and the piston push block can stretch into the sampling hole to be used for pushing out the soil column in the sampling hole. The whole sampling device is simple in structure, low in manufacturing and using cost and convenient and reliable to use.

The utility model provides a soil acidification control experiment soil column, and relates to the technical field of soil acidification detection sampling. The soil acidification control experiment soil column comprises an experiment soil column body, a sampling pipeline is fixedly connected to the interior of the experiment soil column body, the two ends of the sampling pipeline are open, and a movable baffle is hinged to the interior of the sampling pipeline through a pin shaft. According to the device, an experimental soil column is inserted into a potted plant, one end of a sampling pipeline is shielded through a movable baffle and a fixed barrier strip, external soil is prevented from entering the sampling pipeline, and when the potted plant needs to be subjected to acidification detection, a connecting sliding block is driven to slide away from a connecting pull rod; under the connecting action of the connecting pull rod, the movable baffle is pulled to turn over to open one end of the sampling pipeline, so that soil in a potted plant is conveniently sampled through the sampling pipeline, the pH condition of the soil is measured, the vertical change trend of acidification is known, and the soil structure and potted crops are not damaged.

The utility model discloses a kind of for simulating root litter in situ sustained input device and its application, through the design of the soil column with stainless steel handle, 1 μm aperture nylon net, the PVC pipe with hole in bottom and multi-generation root litter in situ sustained input simulation system, the dynamic simulation of root litter sustained input process under soil profile scale is realized.The device solves the limitation of traditional decomposition experiment, can dynamically add root litter without destroying soil structure, while effectively blocking exogenous interference, ensuring the accuracy and consistency of experiment.The utility model provides key technical platform for studying the influence of root litter in situ sustained input on soil carbon stability, and is suitable for ecology, carbon cycle research and ecological system management and other fields.

The invention discloses a soil column test device and method for plant root zone micro-ecology simulation research. The soil column test device comprises a soil column test model module and a solution collection module. The soil column experimental model module comprises a soil filling container with an upper cover and a lower cover, a plant root simulation device, a simulated root exudate sampling device, a soil oxidation-reduction potential monitoring device and a gas collection device, and the solution collection module is used for collecting liquid in the simulation process. According to the device, the plant root simulating device, the root exudate simulating and sampling device, the soil oxidation-reduction state monitoring device and the gas and soil solution collecting device are integrated, so that comprehensive simulation and monitoring of multiple factors of a plant root zone are realized. The device is low in processing cost, convenient to use and easy to operate, all parts are detachable and reusable, multiple pieces of environmental parameter information can be obtained, and the device has important significance on plant root zone micro-ecology research.

The invention discloses a soil organic carbon mineralization rate determination method, and relates to the technical field of soil carbon circulation and greenhouse gas monitoring. The method comprises the following steps: carrying out hydrochloric acid back titration on an absorption liquid by adopting an automatic potentiometric titration method, converting to obtain the mass of a carbon element contained in carbon dioxide, calculating the mineralization rate by combining the dry soil weight and the culture interval, and finally subtracting an inactivation control value to obtain the organic carbon mineralization rate driven by pure microorganisms. A thin-wall stainless steel undisturbed soil drill matched with the inner diameter of a culture bottle is used for collecting soil columns in a layered manner, PVC liner tube sealing and constant-temperature transportation are matched, and a cold chamber for simulating the in-situ temperature is combined, so that the in-situ structure and the microbial habitat of the loose high-water-content peat soil are reserved to the maximum extent, and damage of traditional pretreatment to soil pores and microbial communities is avoided.

The invention relates to the technical field of soil sampling, in particular to a soil sampling device for environmental governance detection and a sampling method.The soil sampling device comprises a stabilizing frame, two symmetrical supporting plates are fixedly installed on the inner side of the stabilizing frame, hydraulic rods are arranged at the tops of the supporting plates, and lifting table lug plates are jointly installed at the telescopic ends of the hydraulic rods on the two sides; an electric push rod is pushed forwards to enable a side edge plate of a connecting piece to drive a guide strip to move towards the axis of a drilling barrel, at the moment, when the guide strip moves, the guide strip drives a sleeve piece to move, and when the sleeve piece moves, a displacement barrel is driven to slide outside a positioning barrel; the displacement cylinder is inserted into the side edge of a soil column limited in the drilling cylinder, then the air cylinder is started to retract to drive the bottom plate to move upwards, the bottom plate pushes the driven wedge blocks corresponding to the driving wedge blocks through the driving wedge blocks when moving upwards, and suction force in the positioning cylinder conducts suction sampling on soil through the displacement cylinder.

The invention provides a monitoring device for simulating a slurry invasion film forming and pollutant migration process, and belongs to the technical field of environmental geotechnical engineering. Comprising a soil column permeation module used for simulating a stratum environment and providing a sealed space for mud invasion and pollutant migration; the air pressure driving module is used for providing and adjusting air pressure power for mud invasion and pollutant migration processes; the pollutant migration module is used for injecting pollution liquid into the soil layer invaded by the mud and collecting samples; the monitoring and recording module is used for collecting and recording pore water pressure, images and percolate quality data in the experiment process in real time. According to the invention, the integration of mud invasion and pollutant migration experiments is realized, the determination of key parameters is realized, the invasion film-forming rule of mud under the influence of multiple factors is dynamically revealed, the specific mechanism and quantitative evaluation of the heterogeneous mud permeation zone influencing the pollutant migration behavior are clear and definite, and the operation is simple and convenient. Therefore, key data and theoretical support are provided for evaluating and improving the overall barrier efficiency of the vertical separation wall.

The invention provides an infrared measurement method for temperature distribution in a frozen soil fractional congelation and expansion process. The method comprises the steps that frozen soil is placed in a soil column barrel, a temperature sensor is arranged at the position of the frozen soil, an infrared camera is arranged outside the soil column barrel, an infrared temperature measurement window is formed in the soil column barrel at a certain height, a polyethylene thin PE plate is fixedly installed at the position of the infrared temperature measurement window, and a layer of polyvinyl chloride PVC film is pasted on the inner side of the polyethylene thin PE plate. Infrared rays emitted by the infrared camera penetrate through the PE plate and the PVC film to irradiate the frozen soil, the infrared camera receives reflected rays reflected by the frozen soil, and the temperature of the frozen soil is measured according to the reflected rays; the temperature sensor is used for measuring the temperature of some sections of the frozen soil, and the temperature measured by the temperature sensor is used for correcting the temperature, measured by the infrared camera, of the frozen soil. According to the invention, a limited number of temperature sensors and a digital image method are adopted to correct an infrared image, and high-precision temperature measurement of the total cross section of the soil column, especially key positions such as segregation cracks, is realized.

The invention provides a multifunctional soil sample microscopic sampling instrument and a soil sample manufacturing method, and the multifunctional soil sample microscopic sampling instrument comprises a base which is provided with a stand column and an operation table; a cross beam is arranged on the stand column; a hollow drill is arranged at the tail end of the cross beam; the hollow drill is used for drilling a soil sample; a clamping plate and a motor are arranged on the operation table. The clamping plate is used for clamping a soil sample; the pushing rod is used for pushing a soil column in the hollow drill upwards; the motor is connected with the blade; the blade is used for cutting the soil column; the operating platform is also provided with an infrared light sensing system; the infrared light sensing system comprises an infrared emitter and a display screen. According to the invention, high-precision, standardized and automatic preparation of the soil sample can be realized, and the sample requirements of various analysis methods such as scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and microscopic computed tomography (mu-CT) can be met.

The application discloses a kind of equipment for studying the stability of MICP mineralization product under dry-wet-freeze-thaw cycle, comprising: soil column test unit, refrigeration cycle system, heating cycle system, temperature monitoring system and water injection unit;Soil column test unit includes temperature guide plate, soil column sample cylinder, heat preservation layer and water permeable plate;Refrigeration cycle system includes refrigeration device, cooling liquid inlet pipe and cooling liquid outlet pipe;Heating cycle system includes heating device, hot liquid inlet pipe and hot liquid outlet pipe;Temperature monitoring system includes temperature sensor and data acquisition equipment;Water injection unit includes water storage tank and peristaltic pump;Soil column sample cylinder is also provided with water outlet for discharging water in soil column sample cylinder.The equipment can simulate the dry-wet and freeze-thaw cycle environment of soil column sample, obtain the stability parameters of soil column sample under the action of dry-wet cycle and freeze-thaw cycle alone or coupling, and evaluate the stability effect of MICP technology in repairing heavy metal pollution, providing theoretical and practical basis.

The invention relates to the technical field of sampling equipment, and discloses geological exploration soil layer sampling equipment which comprises a rack mounted on a vehicle body and at least one drill pipe, the bottom end of the drill pipe is connected with a drill bit, the rack is provided with a movable drilling device driven by a hydraulic cylinder to move up and down, and the middle of the drill bit is hollow. The interior of the drill bit communicates with the interior of the drill pipe, an annular flow guide groove communicating with the lower flow guide groove is formed in the top of the drill bit, and a flow guide hole communicating with the annular flow guide groove is further formed in the drill bit. The middle of the drill bit is designed to be hollow, the interior of the drill bit is communicated with the interior of the drill pipe, uncrushed soil on the inner side of the drill bit forms a to-be-sampled soil column on the inner side of the drill pipe while the drill bit is used for drilling, and the integrity of the to-be-sampled soil is guaranteed on the premise that high-efficiency drilling for sampling deep soil is guaranteed; and the accuracy of a soil sampling survey result is further improved.

The invention discloses an under-forest soil moisture migration characteristic research system and method, and relates to the technical field of forestry soil moisture migration research. Comprising an under-forest soil sampling unit, a cylinder temperature adjusting unit, an under-forest soil infiltration research experiment unit and an under-forest soil water retention research experiment unit, the under-forest soil sampling unit comprises a soil sampling drilling machine, a soil sampling barrel and a soil sampling barrel cutter; the cylinder body temperature adjusting unit is used for heating an undisturbed soil column in the soil sampling cylinder body; the under-forest soil infiltration research experiment unit is used for carrying out infiltration experiments on the undisturbed soil column in the soil sampling cylinder at different temperatures and under different earth surface conditions; and the under-forest soil water retention research experiment unit is used for carrying out field in-situ water retention observation experiments. According to the invention, the in-situ soil column is directly obtained by adopting the soil sampling cylinder, and an infiltration experiment can be directly carried out after the in-situ soil column is cut by the soil sampling cylinder, so that forestry practitioners and researchers can repeatedly obtain a large amount of undisturbed soil in a short time to carry out infiltration experiment research, and a forestry soil research method is innovated.

To provide a torsion response prediction method and a torsion response prediction device capable of easily evaluating torsion response caused by foundation input motion of a building located on irregular ground.SOLUTION: Calculating respective impedance ratios α γ = (γ 1 * Vs1) / (γ 2 * Vs2) of the stratum structures 1 and 2, where Vs1 and Vs2 are respective shear wave velocities of the stratum structures 1 and 2, and γ 1 and γ 2 are respective wet densities of the stratum structures 1 and 2, and calculating an area ratio β = A1 / (A2 + 2A1) from respective basic cross-sectional areas A1 and A2 of the stratum structures 1 and 2; A response analysis of a one dimensional soil column model is performed with respect to each of the layer structures 1 and 2, maximum displacements D1 and D2 of the grounds of the layer structures 1 and 2 are calculated, a difference in ground displacement Δ D = D1 - D2 is obtained, and a rotation angle θ max of the building caused by a base input motion is calculated using the following equation θ max = = p * (Δ D·L) q·α γ / β using preset coefficients p and q with a base length L of the building.SELECTED DRAWING: Figure 2

A kind of volumetric water content type soil moisture characteristic curve measurement system and method, belong to soil physical property measurement field, including centrifugal rotor, centrifugal tube, calibration module and the drive module of driving centrifugal rotor to operate at different speeds;Centrifugal rotor is equipped with multiple insertion slots for inserting centrifugal tube;Centrifugal tube includes outer tube and inner tube, inner tube is nested in outer tube, inner tube is used to hold soil sample, and its bottom wall is filter membrane structure;Outer wall of outer tube is marked with millimeter scale, and scale is increasing from bottom to top along the axial direction of outer tube;The detection end of calibration module is arranged on the outer circumferential side of centrifugal rotor, and it is towards the outer wall of outer tube, for collecting image frame containing outer wall scale of outer tube, liquid level position in outer tube and upper boundary and lower boundary of soil column in inner tube after centrifugal rotor operates at different speeds for different time, and completing dynamic self-calibration of pixel and actual length with millimeter scale of outer wall of outer tube as internal standard, to calculate the soil column volume and dehydration volume of soil sample.

The utility model provides a portable undisturbed soil column sampler which comprises a drill bit, a guide rail, a counter weight and a handle, one end of the guide rail is detachably connected with the drill bit, the other end of the guide rail is detachably connected with the handle, and the interior of the drill bit is of a cavity structure capable of containing a soil sample. The heavy hammer is used for sampling a soil sample into the cavity by impacting one end of the drill bit. Under the clamping of the impact force of the heavy hammer, when the drill bit is used for sampling, the drill bit can be conveniently inserted into soil, an undisturbed soil column can be collected under the condition that the soil structure is not disturbed, the operation is simple and convenient, manpower is saved, and the sampling efficiency is also improved; after sampling is finished, the drill bit, the guide rail, the heavy hammer and the handle can be detached, and outdoor carrying is convenient. The device is simple in structure, good in using effect and easy to popularize and use.

The invention provides a soil column environment multi-scene simulation comprehensive test device and method, and belongs to the field of environmental geotechnical engineering. The device comprises a simulation box, a soil column unit, a wind erosion water level control unit, a temperature control system, a sunlight rainfall simulation system and a wind power simulation system. The simulation box is provided with an access door, a splash-proof rain cover, a ventilation grid, a permeable grid and a drainage pipe. The soil column unit is composed of a liquid collecting bottle, a base, a hollow cylinder set and a wind erosion water level control mechanism and can simulate different heat exchange working conditions. The wind erosion water level control unit drives the flexible waterproof cloth to ascend and descend through a motor, and wind erosion and water level control is achieved. The temperature control system adjusts the temperature in the box through the cold-heat exchange pipe. The sunlight and rainfall simulation system simulates rainfall and sunlight through a shower head and a sunlight irradiation lamp. The wind power simulation system generates stable airflow through the axial flow fan array. According to the invention, various environment scenes can be simulated at the same time, and the characteristic change of soil under different environment conditions can be accurately researched.

The present application provides a soil column device and method for simulating soil water and salt leaching under drip irrigation conditions. The method generates simulated moisture information at different depths within the soil column device; pre-installs intelligent moisture sensors and intelligent salt concentration sensors in each soil layer of the soil column device, collects soil moisture information via the pre-installed intelligent moisture sensors, and then determines the degree of fit between the simulated moisture information and the soil moisture information; collects the salt concentration within the soil column device during drip irrigation via the pre-installed intelligent salt concentration sensor, and determines the water-salt permeability coefficient during water and salt migration within the soil column device based on the soil moisture information and salt concentration; adjusts the saturated hydraulic conductivity based on the degree of fit; and uses the adjustment result and the water-salt permeability coefficient to determine the sensitivity of the soil's saturated hydraulic conductivity to water and salt leaching. The present application's solution allows for adaptive adjustment of the leaching simulation process under the premise of dynamic changes in soil physical properties.

The invention discloses a temperature control sectional soil column leaching test device and method, and the device comprises a water supply unit which comprises a water supply tank which is provided with a water outlet control valve; the lifting unit is used for bearing and adjusting the height of the water supply tank; the leaching unit comprises a water storage containing pipe, a soil column containing pipe and a water guide containing pipe which are communicated in sequence, and the soil column containing pipe is used for containing a soil sample; the temperature control unit comprises a water bath kettle, a peristaltic pump and a heat preservation containing pipe covering the outer side of the leaching unit; a water outlet of the water supply tank can be selectively communicated with the water storage containing pipe or the water guide containing pipe; an inlet of the peristaltic pump is communicated with the water bath kettle, an outlet is communicated with a bottom water inlet of the heat-preservation containing pipe, and a top water outlet of the heat-preservation containing pipe is communicated with the water bath kettle in a backflow manner to form a closed constant-temperature liquid circulation loop; the soil column containing pipe and / or the heat preservation containing pipe are / is of a multi-section structure detachably connected in the axial direction. A plurality of constant water head holes are formed in the corresponding positions of the side walls of the heat preservation containing pipe and the water storage containing pipe and connected with constant water head pipes. According to the invention, the steady infiltration of the soil column leaching test can be ensured, the water distribution is uniform, the integrity of the leaching soil column is ensured, the experiment temperature can be well controlled, and the test result can be more accurate.

This application provides an in-situ one-dimensional soil column permeability test device and method under rainfall conditions, relating to the field of soil permeability testing. The in-situ one-dimensional soil column permeability test device under rainfall conditions includes: a simulated soil mass and a rainfall simulation system. The simulated soil mass includes a test soil pile, a simulated soil column, and a moisture content sensor. The rainfall simulation system includes a stabilizing support, a simulated rain box, and an adjustment mechanism. The stabilizing support is inserted and fixed within the test soil pile and spans the test trench. The adjustment mechanism is located at the upper end of the stabilizing support. This in-situ one-dimensional soil column permeability test device under rainfall conditions allows for direct observation of permeability rate and permeability deformation, and can obtain the moisture content time-history curve during the test process to study the seepage field changes of the simulated soil column. It also effectively controls the distance between the simulated rain box and the top of the simulated soil column, reducing the impact of rainfall on the boundary of the simulated soil column.