49 results about "Soil saturation" patented technology

The invention discloses a method for measuring soil suction according to a light reflection theory. The method mainly includes: (1) adopting the light reflection theory for measuring soil saturation degrees to distinguish dry soil and wet soil, and carrying out the next step if wet soil is determined; (2) selecting saturation degrees from a soil-water characteristic curve; (3) selecting dry density from an actual measurement solid-line curve; (4) compacting soil for measurement in a mould to the dry density selected in the step (3) and the corresponding saturation degree, and adopting a camerafor taking pictures; (5) quantifying images obtained in the step (4) by gray levels according to gray values; (6) analyzing average gray value variation conditions to find out a relationship betweenthe saturation degrees and the gray values. The method is a novel low-cost direct color analysis technique free of intrusion disturbance and applied to canal embankment, expressway and runway roadbeds, filling liners, earth dams and the like, limitations of common instruments for measuring suction of farmland and rock-soil base facilities are avoided, and an application range is expanded.

The invention relates to a novel non-pressure irrigation rig. The water outlet valve of a water supply tank is opened, irrigation water flows into a water level control tank, when the water level of the tank is higher than h1, an intake tube is submerged, air suction is changed into water inflow until the water level in the intake tube is equal to the water level in the water supply tank, the irrigation water does not flow into the water level control tank, the water level of the tank is stabilized at the water level slightly higher than h1, the irrigation water enters into a filling area at the upper part in a U-shaped slot by virtue of a permeable cover plate and a sand inverted filter from the bottom in the U-shaped slot of the irrigator, a soil saturation water layer which is at the same height of the water level of the water level control tank and is lower than the upper edge of the U-shaped slot, water of the saturation water layer rises to the root layer of a crop in a capillary water way, a crop consumes water to cause the water level of the water level control tank to be lower than h1, the intake tube comes out of water surface, air is sucked in air bubbles, the irrigation water flows into the water level control tank, the water level rises to submerge the intake tube again, the crop consumes the water to cause the water supply process to be repeated, the output of supplying water is increased or reduced along with water consumption, irrigation is adaptive, and the irrigation rig is simple to operate and is convenient to use.

The invention belongs to the technical field of geotechnical tests and discloses a hollow cylinder compacted soil sample saturation device, which includes a saturator top cover, a locking nut, a three-valve diaphragm, a pull rod, a buckle, a saturator base, a top permeable stone, Inner hollow cylindrical permeable stone, soil sample and bottom permeable stone, the bottom of the top permeable stone is provided with an inner hollow cylindrical permeable stone, the bottom of the hollow cylindrical permeable stone is provided with a bottom permeable stone, and the hollow cylindrical permeable stone is composed of The three-valve diaphragm is fully wrapped. The hollow cylindrical permeable stone and the three-valve diaphragm are located inside the base of the saturator. The three-valve diaphragm is fixed by a buckle. The top cover and the saturator base are connected and fixed by a tie rod. The pull rods are fixedly connected by locking nuts. The invention has a good support and permeable effect on the inner wall of the soil sample through the simple treatment method of adding hollow cylindrical permeable stones, and well solves the problem of HC soil sample saturation.

A combined cultivation method for water and soil conservation for sloping farmlands relates to cultivation methods for water and soil conservation and solves the problem that using the single cultivation technique for holding water is unsatisfactorily effective. The combined cultivation method includes: firstly, adjusting ridges of sloping farmlands on downward slopes and inclined slopes under ridge plowing adjusted into transverse slope ridges, and adopting contour farming and belt planting; secondly, building ridges, and planting protective plant belts on the ridges; thirdly, subsoiling forfarming; fourthly, performing furrow damming; and fifthly, performing no-tillage conservation tillage. Furrow subsoiling and furrow damming are technically combined and integrated according to soil and weather characteristics of a black soil area, so that water and soil loss is reduced or avoided for sloping farmlands to the greatest extent, water and soil are conserved, water utilization rate isincreased, and crop yield is increased evidently. By the method, soil saturation and infiltration speed ratio is increased by 24.1% in processing treatment, water utilization rate is increased by more than 15%, crop yield is 30kg per mu, and 100 Yuan per mu is increased..

The invention relates to a crop soil root system gas content determination method, which comprises: carrying out in-situ moisture determination on different root system layers of soil, determining the soil saturation water content Vs, the soil field moisture capacity Vc and the soil water content Vw of crops in different growth stages, and calculating to obtain the actual total gas content Valpha of the soil root system, the actual water content Vwi of soil at different depths is measured in real time by using a soil moisture layering tester, and the actual total gas content Valpha of the soil root system is calculated according to the following formula: Va = Sigma Vai = Sigma Vsi-Sigma Vwi. The water content of soil at different depths is detected, the soil gas content is quantitatively calculated through the water change, the moisture content of crop soil root systems is monitored in real time, and nutrient adjustment and irrigation amount are facilitated.

The invention discloses a prediction method for saturated and unsaturated permeability coefficients of deformed soil based on a fractal theory. The prediction method comprises the following steps: taking a soil-water characteristic curve of soil samples before deformation as a reference state, using a fractal model of the oil-water characteristic curve and fitting to obtain a fractal dimension D0 and an air entry value Psi a0 before the deformation, making the fractal dimension unchanged before and after the deformation, combining with a prediction model of the deformed air entry value to obtain a deformed air entry value Psi a, combining the deformed fractal dimension D0 and air entry value Psi a through a saturated / unsaturated relative permeability coefficient model, predicting the saturated permeability coefficient and an unsaturated relative permeability coefficient of the deformed soil, and multiplying the saturated permeability coefficient and the unsaturated relative permeability coefficient to obtain the unsaturated permeability coefficient. The prediction method for the saturated and unsaturated permeability coefficients of the deformed soil based on the fractal theory disclosed by the invention overcomes the defects that the prediction of the permeability coefficients is empirically based, thereby lacking theoretical support and having complicated calculation, and has the advantages of having extremely important values in seepage theories and fluid-solid coupling research and engineering application of saturated / unsaturated soil.

The invention relates to an improved soil saturation water conductivity detection system. The system comprises a sample information module, a water stop timing module, a temperature measurement module, a weighing module and a processing module. The sample information module in the system records the number, the length, the cross sectional area and the experimental water level difference of a soilsample; the water stop timing module records experiment time; the temperature measurement module detects the temperature of the experimental water and determines the density of the water at the watertemperature according to the detected temperature; the weighing module is used for detecting the weight of discharged water; and the processing module is used for calculating the saturated water conductivity of the soil sample according to the data of the sample information module, the water stop timing module, the temperature measurement module and the weighing module and a model. The volume reading is improved into density calculation under the condition that the mass is divided by the experimental water temperature, so that the result is more accurate; the designed water receiving containeris narrow and small in opening and attached to the latex tube, splashing and evaporation during water receiving are prevented, and the result is more accurate; experimental errors caused by the factthat experimenters open / close the measuring valves one by one and time according to a second chronograph can be avoided, and calculation of the saturated water conductivity is more accurate; and the saturated water conductivity can be automatically calculated and displayed, the operation is simple and convenient, and the experiment efficiency is higher.

The invention relates to a method for testing the moisture content of saturated soil samples, which mainly includes the following steps: firstly, taking a soil sample, then encapsulating the soil sample in a conductive sample chamber, then connecting the conductive sample chamber into a circuit, and passing the ammeter and The voltmeter detects the current flowing through the conductive sample chamber and the voltage across it, and then calculates the resistance value, volume and mass of pore water in the soil sample, and finally calculates the moisture content of the saturated soil sample. This method is based on the electrical principle that water in saturated soil is connected, and current will flow when both ends are energized. Combining the conductivity of water with the volume and mass of water, the water content of saturated soil can be measured quickly and conveniently, and the operation is simple. The traditional tedious operations such as multiple weighing and drying are avoided, and the operability is strong, which can greatly reduce the cost.

A device and application for repairing environmental pollution in rock formations using nanotechnology. Injection wells are provided with pumping wells at intervals of 5 to 10 m along the direction of groundwater flow, and filter screens are arranged in the water injection wells and pumping wells. A nano-bubble saturated solution injection component is arranged on the ground between them, and the nano-bubble saturated solution injection component is respectively connected to the water injection well and the pumping well pipeline, and the environmental pollution of the rock formation is treated through the nano-bubble saturated solution. The invention has low cost, good repairing effect, high repairing efficiency, complete treatment without secondary pollution, and can effectively remove various organic pollutants and heavy metal pollutants in groundwater and its subsaturated soil area, and only needs to set up A corresponding number of water injection wells and pumping wells, combined with one or more sets of devices, can be used in the field of soil and groundwater pollution treatment in different pollution sources, different pollution areas, different pollution degrees, and different pollution depths.

The invention discloses a cylinder infiltration instrument for measuring the saturated hydraulic conductivity of undisturbed soil and a measuring method thereof. The cylinder infiltration instrument includes a cylinder, a top plate, a partition, an exhaust pipe and a water outlet pipe, and the top plate is sealed and installed on the cylinder. On the top of one end of the cylinder, the partition is sealed and installed on the upper part of the other end of the cylinder. One end of the exhaust pipe is pierced on the top plate, and the other end of the exhaust pipe is connected to the partition. There is a vent hole on the exhaust pipe, and the outlet pipe runs through Installed on the partition, the nozzle of the exhaust pipe is equipped with an exhaust valve, the nozzle of the outlet pipe is installed with a water stop valve, the top plate is equipped with a water inlet and a rubber plug, and the bottom of the cylinder is installed with a water-permeable pad. There is a scale on the side wall of the cylinder. The infiltration meter has a simple structure and can quickly and accurately measure the saturated hydraulic conductivity of the undisturbed soil, so as to solve the problems of cumbersome operation and low accuracy of the existing hydraulic conductivity measurement devices. The calculation results of the method are not disturbed by too many factors, and avoid the mixing of various data to cause the hydraulic conductivity K s The phenomenon that the accuracy deviation of the calculation results is too large.

The invention discloses a method for measuring soil suction according to a light reflection theory. The method mainly includes: (1) adopting the light reflection theory for measuring soil saturation degrees to distinguish dry soil and wet soil, and carrying out the next step if wet soil is determined; (2) selecting saturation degrees from a soil-water characteristic curve; (3) selecting dry density from an actual measurement solid-line curve; (4) compacting soil for measurement in a mould to the dry density selected in the step (3) and the corresponding saturation degree, and adopting a camerafor taking pictures; (5) quantifying images obtained in the step (4) by gray levels according to gray values; (6) analyzing average gray value variation conditions to find out a relationship betweenthe saturation degrees and the gray values. The method is a novel low-cost direct color analysis technique free of intrusion disturbance and applied to canal embankment, expressway and runway roadbeds, filling liners, earth dams and the like, limitations of common instruments for measuring suction of farmland and rock-soil base facilities are avoided, and an application range is expanded.