238 results about "Sand sample" patented technology

The present invention relates to a pressure bearing permeation grouting strengthening test apparatus and a method. The apparatus mainly comprises a grouting bucket, a slurry storage device and a manual grouting pressurization device, wherein the grouting bucket comprises a base, a bucket body and a pressing head, a grouting hole is arranged in the base, and is connected with the slurry storage device through a high pressure soft pipe, the slurry storage device is provided with a piston, and the manual grouting pressurization device is placed below the piston. With the test apparatus, influence of axial pressure, confining pressure and other factors of the upper portion of the micro fracture (pores) geology on the grouting can be simulated; the grouting conditions of the geological bodies with different physical and mechanical properties under different grouting parameters and different grouting process conditions can be simulated so as to analyze a mechanism and an effect of grouting strengthening; and with the test apparatus, broken coal rock bodies, soil samples and sand samples can be made into complete samples, can be processed into standard samples through a cutting machine, and then are subjected to related uniaxial and triaxial tests. In addition, the test apparatus has characteristics of simple structure, easy manufacturing, low cost, easy operation, and reliable use.

The invention relates to a testing device and method for simulating the backflow of a propping agent. The testing device mainly comprises a liquid storage pot, a chamber pump, a pipeline heating sleeve, a flow meter, a diversion chamber, displacement sensors, an oil pressing machine, a sand sample collector, a waste liquid pot, a data acquiring and controlling panel, and a computer. The testing method comprises the following steps: propping agent is paved between two rock plates and is loaded in the diversion chamber, the chamber pump is opened to be driven by small discharge, the displacement sensors are arranged at two sides of the oil pressing machine, and are loaded to design pressure, the computer, the pipeline heating sleeve and an electric heating rod are started to adjust the discharge of the chamber pump, all data are transmitted to the computer through the data acquiring and controlling panel, the discharge is gradually increased to obtain the backflow critical flow velocity of the propping agent under certain closing pressure, and the closing pressure is gradually increased to obtain the backflow critical flow velocity of the propping agent under the condition of different closing pressure. The invention can simulate the real condition of the backflow of the propping agent in pressing cracks, and meets the testing requirement of the backflow of the propping agent under the condition of different environments.

The invention relates to scouring model experimental device of underground silt and method, which belong to the technical field of characteristic tests of hydraulics, river dynamics and soil and rockmechanics. The device comprises a scouring tank, a fixing table, a tilting device and a freezing tank. The method comprises the following steps: putting or stacking experimental soil samples or sand samples in the scouring tank; closing the scouring tank; starting a water flow for scouring the underground silt in a model experiment; shooting and recording a scouring process; closing the water flowand maintaining original water pressure when the scouring reaches a certain experimental state; then, freezing the scouring tank and the scouring samples by the freezing tank; labeling, positioning and cutting frozen scouring sample grids; and individually measuring, thawing, weighing and screening second-state frozen small samples to obtain the graduation of scouring models of the underground silt and the distribution of porosity in a scouring state. The scouring model experiment of the underground silt is carried out in a laboratory. The invention provides a reference and a theory for mutually stacking the silt, damming by sand stone and banking for preventing flood for river ways and is applied to the laboratory research of scouring the underground silt.

The invention discloses a gap discharging test device for manually simulating strong wind and sand storm and a test method, wherein the test device comprises a flow field subsystem, an electric field subsystem and a measuring subsystem. In the test process, a sand sample is firstly placed in a sand sender; then the power frequency puncture voltage of the gap between electrodes is measured under the environment of clean air, next, a gap puncture discharging test is performed under the condition with different wind speeds and sand concentrations; a pressurizing method adopts a gradually pressurizing method, and a group of puncture voltages and concentration values are recorded after the puncturing happens; the pressurizing is repeated, each group of tests are repeated again and again to reduce the measuring error, and meanwhile, the sand flow temperature is recorded to be used as a reference. The invention can be used for performing the power frequency puncture of a gap on a transmission line under the environment of strong wind and sand storm and researching the discharging rule, has low cost, simple installation, good stability in the test process, easy operation, and the like.

The invention discloses an online detection device and an online detection method for machine-made sand. The online detection device comprises a control module, a sampling module, a weighing module, adrying module, a sorting module, a dispersing module, an image collecting and analyzing module and a recycling module. The control module is in signal connection with the sampling module, the weighing module, the drying module and the sorting module respectively. Machine-made sand samples pass the weighing module, the drying module, the dispersing module, the image collecting and analyzing moduleand the recycling module downwardly sequentially along the vertical direction after being acquired by the sampling module, and information, such as particle shapes and diameters, of the returned machine-made sand samples is measured automatically. The online detection device and the online detection method have the advantages that rapid online detection of fineness and shape of the machine-made sand can be realized, grading conditions of the machine-made sand of a machine-made sand production line can be reflected timely, and economic loss caused by sand diameter disqualification of the machine-made sand is avoided.

The invention discloses a cylindrical sample preparation device for measuring moisture content of green sand through a capacitance method and a method for measuring the moisture content of the green sand, belongs to the field of moisture measurement of cast green sand, and solves the problem that the measuring accuracy of the moisture content of the green sand through capacitance methods is low in the past. The method includes producing a sand sample with the height equal to a main sample drum through the sample preparation device; connecting two exciting electrode shielded wires with a parallel resistance model circuit respectively, exerting alternating current excitation voltage on two exciting electrodes through the two exciting electrode shielded wires, turning off a switch K, serially connecting a sand sample equivalent resistor Rx with a capacitor Cx, and turning on the switch K, parallelly connecting the sand sample equivalent resistor, the capacitor Cx and a first resistor R0; and measuring the voltage drop uo1 and uo2 of a second resistor R under the two states to obtain the Cx, and obtaining the moisture content of the green sand through the existing relation between capacitor Cx and the moisture content.

The invention discloses a testing device for microorganism-reinforced sand and a use method of the testing device. A sand reinforcement testing device main body structure is composed of an equipment body and a sand mold, wherein the equipment body comprises an upper cover plate, a plexiglass column tube and a lower cover plate sequentially arranged from top to bottom; the upper cover plate and the lower cover plate are bonded with the plexiglass column tube to form a closed space; an upper gravel layer is arranged on one side of the upper part of the closed space close to the upper cover plate; an upper filter plate is arranged below the upper gravel layer; the upper filter plate is embedded in the plexiglass column tube; a lower gravel layer is arranged on one side of the lower part of the closed space close to the lower cover plate; a lower filter plate is arranged above the lower gravel layer; the lower filter plate is embedded in the plexiglass column tube; the sand mold is disc-shaped; and the sand mold is provided with a plurality of circular holes for placing of sand samples. The invention provides the testing device for microorganism-reinforced sand and the use method of the testing device; and the testing device has the advantages of simple structure, relatively high uniformity of cured samples, relatively good curing effect, high utilization rate of bacterial liquid and nutrient solution, and low cost.

The invention discloses an experimental system for monitoring release of pollutants from the bottom sediment in a flood process, the experimental system includes a pollution sand sample mixing device, a sand wave preparation monitoring device and a sampling device, the pollution sand sample mixing device includes a sand mixing container used for mixing water sand and the pollutants, a water sand mixing box used for storing a water sand mixture and a sewage pool used for storing the pollutants, the water sand mixing box is connected with the top of the sand mixing container by a conduit, the sewage pool is respectively connected with the top and the bottom of the sand mixing container by water conduits, the sand wave preparation monitoring device comprises at least one detachable sand wave mold and an electric conductivity probe placed in the sand wave mold, and the sampling device comprises a sampler and a plurality of removable sampling plates, wherein the sampler is provided with an upper opening and a lower opening, and is assembled by the plurality of removable sampling plates. The experimental system adopts the manner of vacuum pump and conduit drainage combination, and uses the simple inverted siphon physical principle, the water sand in the water sand mixing box is sucked into the sand mixing container, and a great deal of manpower and time are saved.

The invention relates to a method for detecting the content of chlorine ions in sea sand. The method comprises the steps of sieving sea sand to obtain undersized sand as a sea sand sample; adding deionized water into the sea sand sample, heating and/or carrying out ultrasonic vibration and standing; filtering, immersing a chloride ion selective electrode and a saturated calomel electrode into filtrate and connecting the two electrodes with a potentiometer; reading the voltage millivolt value, enabling the electrodynamic potential of a battery and the concentration of chloride ions in a solution to be tested to conform to the Nernst distribution law and acquiring the molar concentration of the chlorine ions according to the regression analysis formula; and converting the molar concentration of the chlorine ions into the weight percentage of the sea sand, thereby acquiring the measured value of the content of the chlorine ions. According to the method, the ion measurement value can be in accordance with the true value of the content of the chlorine ions in sea sand, and reliable reference data is provided for building sand.

The invention relates to a method for preparing high strength microorganism mortar by microorganism generating urease and calcium acetate. The method comprises steps of 1. inoculating single bacterial colony of the microorganism generating urease into a fermentation medium for fermentation cultivation so as to obtain a bacterial liquid; 2. processing a grouting die in a closed water mode, pouring sand into the die, sealing the grouting die except the slurry inlet and the slurry outlet; 3. pouring the bacterial liquid into one cubic meter of sand sample from the slurry inlet at the speed of 20-40L/m till a yellow bacterial liquid flows out from the slurry outlet; 4. pouring 0.05-0.1mol/L calcium acetate stationary liquid into one cubic meter of sand sample at the speed of 20-40L/m; 5. pouring a reaction solution into one cubic meter of sand sample for 48 hours at the speed of 2-5L/m; 6. pouring a 0.05-0.1mol/L calcium acetate stationary liquid into one cubic meter of sand sample at the speed of 20-40L/m; and 7. repeating from step 3 to step 6 for many times. The microorganism mortar prepared by the method can reach the required strength in 3-8 days and prevents the harm of chloridion to a concrete structure.

The invention discloses a sand rain device capable of automatically controlling the drop distance and an application method of the device. The sand rain device comprises a sand hopper, a sand falling device, a model box and an automatic lifting pedestal; the drop distance is controlled accurately in a manner that the weight of scattered sand is converted into the sinking height of the pedestal. The invention also discloses an application method of the sand rain device capable of automatically controlling the drop distance. The application method of the sand rain device capable of automatically controlling the drop distance comprises the following technical steps: determining the density of a sand sample, determining the drop distance, fixing the model box on the pedestal which can automatically adjust the sinking height by virtue of the weight, horizontally moving the sand hopper and scattering the sand, wherein the pedestal automatically sinks according to the weight of the sand sample until the sand scattering is finished. The vertical height of the sand falling device does not need to be moved in the sand scattering process, and the sinking amount of the pedestal is always the same with the height of the sand sample, namely the drop distance is constant all the time. The sand rain device capable of automatically controlling the drop distance overcomes the defects that the sand sample is nonuniform and the density is inaccurate as the drop distance can not be accurately controlled in the conventional sand rain sample prepartion process and has the advantages of high accuracy, convenience in operation, simple and feasible technology, high practicability and the like.

The invention refers to a thin section sampling method for a kind of rock ore verification, especially refers to the quick sampling for clay and loose rock and sand sample. Takes the clay or loose rock (sand) samples fore preprocessing the thin section, uses surface activating agent to foam to preprocess, after beings filter and dried, adds in the bonding agent, firming agent and advancer, vibrates in the vibrator, then it can be grinded into pieces by the miller. It needn't special device, the process is simple, and the flow is short. And it generates no harm gas. The solidification time of original 'glue stewing method' is 1-4 hours, the method only need 20-25 minutes. The invention upgrades the efficiency for 4-10 times.

The invention discloses a method for measuring uniform particle size based on an auto-correlation algorithm. The method comprises two steps of photographing a target particle image and processing the image by the auto-correlation algorithm to obtain the particle size. The image of the target particle on a plate is photographed through a digital camera, proportional relationship of actual length and pixel length is determined through a size calibration object, the image of which gray is processed is moved in eight directions in a selected target area, correlations of the area before and after the image is moved are respectively calculated, a correlation curve is drawn, the displacement distances of movement in the eight directions which firstly return to a rising top are determined and converted to actual lengths according to the proportional relationship, the maximum length in eight lengths is adopted as the long diameter of the target particle, the minimum length in the eight lengths is adopted as the middle diameter, and the mean value of the eight lengths is adopted as the mean particle size. By using the method for measuring the uniform particle size based on the auto-correlation algorithm, field measurement and on-site real-time measurement are realized, and accuracy measurement on long diameters, middle diameters and mean particle size of fine sand samples, coarse beans and pebbles is realized through universal available equipment.

The invention discloses a fine sediment grading device and method. The fine sediment grading device sequentially comprises a sediment adding barrel (4), a sedimentation transition barrel (3), a sediment grading barrel (2) and a base (1) which are sleeved with one another from top to bottom, wherein the sediment grading barrel (2) is composed of an upper barrel (5) and a lower barrel (6); control valves are arranged in a position, close the top, of the upper barrel (5) and a position below the middle of the lower barrel (6); a rotary switch is arranged at the bottom of the sediment adding barrel (4); a rod body (9) is arranged on the rotary switch. According to the fine sediment grading method, sediment particles in a certain particle size range can be separated by opening and closing the control valves. The device is simple in structure, convenient to clean, suitable for batch processing of sand samples, high in grading precision and good in flexibility, can separate sediment particles with the fine particle range of 2-62 microns; the method is easy to operate and high in applicability. If the device is long enough, the device can be used for separating sediment particles with the particle size range of 62-2000 microns; the particle size of the separated sediment is the settling particle size, and conversion between two particle sizes is avoided.

The invention belongs to a quick analysis method of wet-type clay sand quality parameters for casting and its equipment. In particular it relates to a method for detecting effective clay content, water content, air permeability and comprehensive strength of wet-type clay sand and its equipment. Said method is characterized by that applying AC power supply and DC power supply to standard sand sample at twice successively to make excitation, and utilizing measured sand sample AC conductive capability, initial AC conductive capability, AC condutive capability change rate and other information parameters obtained in the sample-making process to solve the effective clay content and water content, and can obtain tested result within few seconds. Said equipment includes sand sample barrel, strength detection cylinder, piston rod and weighing sensor, etc.

The invention relates to a detection method for iron content and provides a method for detecting iron content of quartz sand by using magnetic susceptibility. The method is characterized by comprising the following steps: (1) drying a quartz sand sample; (2) preparing sample making tools and materials; (3) preparing a sample; (4) measuring magnetic susceptibility; (5) drafting a standard curve; and (6) testing iron content. The invention adopts an environment-friendly and rapid magnetic measurement method for detection of the content of elemental iron in quartz sand. During detection, no chemical is needed for dissolving of quartz sand, so detection time can be substantially saved; normally, the magnetic measurement method only takes ten minutes at most for detection of one sample, and no pollution is posed to the environment during detection.

The invention discloses a self circulation variable head permeability test experimental instrument, which comprises a base. A support seat, a sand container, and a back plate are arranged on the basein sequence. The back plate is vertically arranged on the base. The support seat is fixed on the base through a bolt. A measuring cylinder is arranged on the support seat. A rectangular cap is arranged on the upper end of the sand container. The lateral wall of the sand container is provided with at least two through holes, and the distances between two through holes are equal. Each through hole is connected to a pressure measuring pipe guiding to the vertical direction. The lower end of the back plate is fixedly provided with a pressure measuring row. The pressure measuring pipe is fixed on the pressure measuring row. A water stabilizing tank is fixed on the upper end of the back plate. A water level variable pipe, which is the same height of the water stabilizing tank, is also fixed on the upper end of the back plate. One side, which is far away from the water level variable pipe, of the back plate is provided with a water tank. The provided experimental instrument can measure powdery soil with small viscosity, is capable of measuring head loss and seepage discharge of a sand sample, and calculates the hydraulic gradient and permeability coefficient. The experimental instrument is made of an organic glass material and has the advantages of transparency, small volume, easy preparation, high precision, and convenient operation.

The invention discloses a permeation measuring device and method for layered sand migration process under different osmotic gradients. The main structure of the device comprises a water supply system,a sample permeation chamber, a water head measuring system and a flow measuring system, wherein the water supply system mainly comprises a water pump, a water supply valve, a water pipe, a flow control valve, a water storage tank and a safety relief valve, wherein the sample permeation chamber mainly comprises an acrylic cover plate, an O-type seal ring, a permeable stone, a 500-mesh filter, a bolt and an organic glass tube; the water head measuring system mainly comprises a PVC hose, a bellows water pressure gauge and a quick-connect fitting; and the flow measuring system mainly comprises anautomatic exhaust valve, a support grid, an atmospheric pressure water storage tank, a water pipe, a water stop valve and a rotameter. The device provided by the invention can simulate the sand seepage test under different conditions, and can meet the requirements of the experimental research on the piping, osmotic deformation and osmotic failure as well as the sand seepage test in other geotechnical engineering at the same time, which is particularly suitable for seepage test of layered sand samples under the gradient changed water pressure condition.

The invention discloses a multifunctional test device and a multifunctional test method for measuring the induced polarization effect of a water-containing sand sample. The multifunctional test device comprises two electrolysis chambers and a test sample chamber, wherein the test sample chamber is positioned between the two electrolysis chambers, and each of the electrolysis chambers is isolated from the test sample chamber through a permeation plate capable of adjusting a permeation parameter; test electrode systems for finishing an induced polarization effect test of the water-containing sand sample under a flowing water condition are mounted in the electrolysis chambers; under the action of a rotating device, the test sample chamber drives a test sample to rotate so as to realize automatic stirring, and the upper part of the test sample chamber is connected with a flowing water device through a connection hole; the flowing water device is used for simulating flowing water by respectively controlling a water amount and a water level in the sand sample in a test process.

The invention provides a method for solidifying island reef calcareous sand through indigenous microorganisms. The method for solidifying the island reef calcareous sand through the indigenous microorganisms comprises the specific steps: firstly a calcareous sand sample is adopted through a sterile measure, and growth promotion fluid and consolidating fluid are prepared; when the growth promotionfluid with 1.2 times of the pore volume is injected into the calcareous sand till the concentration of carbonate ions in an effluent is equal to or larger than 70% of the concentration of urea in thegrowth promotion fluid, the growth promotion fluid stops being injected; when the consolidating fluid is injected for the first time, a Tris-HCl buffer solution with 1.2 times of the pore volume of sandy soil is injected into the sandy soil firstly, then the consolidating fluid with the equal pore volume is injected into the calcareous sand, the fluid is injected in the direction from bottom to top, the fluid is continuously injected for 7-9 days, and consolidating is completed; and then demolding and drying are conducted, and a consolidated sample is obtained. Operation is easy, the cost is low, the homogeneity of the solidification effect of the calcareous sand can be effectively improved, and meanwhile the adverse impact on the ecological environment due to introduction of exogenous microorganisms is avoided.

The invention relates to an experimental device and an experimental method for simulating the influence of external pollutants on sediment incipient motion and deposition. The device comprises an annular water tank, a sampling unit, a control unit, a measuring unit and a shooting unit, wherein the sampling unit is used for injecting quantitative sand samples and external pollutants into the annular water tank; the control unit comprises a control host as well as a temperature control unit, a flow speed and flow quantity control unit which are connected with the control host; the measuring unitcomprises a pH value measuring unit, a suspended material concentration measuring unit, a water level measuring unit and a sampling unit; the sampling unit is used for extracting sediment water withdifferent water levels to measure sand content; and the shooting unit is used for shooting bed sand form in the annular water tank. The influence of the external pollutants on sediment incipient motion and deposition under different conditions is considered, positive significance in promoting sediment motion mechanics theory research and development is achieved, and important parameters are provided for research on riverway treatment, hydraulic engineering construction, shipping lane design, biological habitats and the like.

The invention discloses a self-circulation energy saving device of critical particle size for separating tailing sand bed loads from suspended loads; and based on theoretical knowledge on traditional sediment aspect, a physical model is used as a carrier to search the critical particle size for separating the tailing sand bed loads from the suspended loads. A manual windlass lifting water head water tank, a lifting bracket and am energy dissipating ball are used for obtaining similar uniform currents with different unit discharges; the energy dissipating ball is positioned in a water inlet pipe port for connecting a water head water tank with a model box; and the lifting bracket is positioned at the lower part of the model box. The self-circulation energy saving device has the beneficial effects of water saving, environmental protection, low cost and simple operation, can change various indexes of sand samples to repeat tests, and can change the water head and the lifting bracket to obtain the similar uniform currents with different characteristics. The self-circulation energy saving device searches the critical particle size for separating the tailing sand bed loads from the suspended loads, and has important significance on research of such aspects as the sediment discharge, the silting parts of the bed loads and the suspended loads and the shape and the expansion of a break opening in overtopping dam break.

The infrared spectrum analysis process for measuring hydroxyl radical content in natural quartz includes: selecting quartz glass tubes with different hydroxyl radical contents and measuring their transmitted spectrums with an infrared spectrophotometer; measuring the transmitted spectrums of prepared quartz sand samples and comparing with those of quartz glass tubes to obtain standard quartz sand samples and establish standard atlas; showing the transmission curves of the tested quartz sand and the standard quartz sand sample in the same scale and comparing to obtain the radical content in tested quartz sand. The present invention may be used in quartz sand producing process.