190 results about "Permeameter" patented technology

The invention relates to a time domain reflection unsaturated permeameter. The center of a barrel cap (11) is provided with an air outlet (1); the joint of the barrel cap (11) and a barrel wall (8) is sealed by a first rubber ring (2), and the joint of a base (10) and the barrel wall (8) is sealed by a second rubber ring (6); and 5 buried waveguides (3) are arranged at equal intervals in the barrel wall (8), a soil sample in the barrel wall (8) is isolated from the base (10) by porous stones (4), and the positions on the base, corresponding to the porous stones, are respectively provided with a water inlet (7) and a water outlet (5). The invention also provides a method for measuring the unsaturated permeability coefficient of a soil body. The method uses a time domain reflection probe to measure the water content of the soil body in the fixed positions and solves the unsaturated permeability coefficient of the measured medium by making use of the beforehand-measured soil-water characteristic curve of the measured soil body and finally using the instant section method. The invention can be used for measuring the unsaturated permeability coefficient of different soil samples (undisturbed or remolded) and improves the accuracy.

Determination of hydraulic properties such as porosity and permeability of soil is of paramount importance in hydrology and civil engineering. In order to achieve greater accuracy in determination of permeability of soil using falling head permeameter, the two important known constraints of human monitoring error in noting the falling water level between two selected levels and elapse time between these two levels had overcome through electronically sensing the levels between two selected points and activating the timer clock automatically by the pulses coming from senor. The precision in measurement of time lapse in 1 / 100th a second enables greater accuracy in estimation of permeability. Provision of perforated Teflon disc above and below the soil core facilitates in application of water uniformly over the entire surface area of soil core at top and similar way permeated water leaving the soil core uniformly without any obstruction. The use of carbon steel seamless tube while collecting soil core facilitated in undisturbed soil core recovery from desired depth section. The permeability test was conducted for various sorted sands of different size ranges and each sample was subjected to repetitive tests and elapsed time for each test was recorded from timer unit. Coefficient of Permeability was calculated for each test. The lab experiment conducted for sorted and unsorted sediments has yielded a consistent performance of Electronic level sensor and timer based falling head soil permeameter.

The invention discloses a multifunctional unsaturated soil permeameter and a testing method thereof. The permeameter comprises a first bracket, a second bracket, a water supplementing device which is fixed on the first bracket and can perform up-and-down adjustment, and a soil sample permeation device which is fixed on the second bracket and can perform up-and-down adjustment, wherein the water supplementing device and the soil sample permeation device can be combined to form an underground water level rise simulation device, a flooding simulation device or a rainfall simulation device. The testing method comprises the following steps of: 1, performing underground water level rise, flooding and rainfall simulation tests, namely respectively performing the underground water level rise, flooding and rainfall simulation tests on the same tested soil sample by employing the underground water level rise simulation device, the flooding simulation device and the rainfall simulation device; 2, performing test data arrangement, and acquiring a permeation characteristic testing result of the tested soil sample. The multifunctional unsaturated soil permeameter is reasonable in design, low in investment cost, simple in operation, convenient in realization and good in using effect and can simply and rapidly finish the permeation characteristic testing process of unsaturated soil.

The invention is a method of determining all the components of an absolute permeability tensor of a porous medium sample from permeability measurements, obtained for example by placing the sample in a permeameter which is useful for fast determination of permeability anisotropies of rocks and detention of internal heterogeneities. A pressure difference ΔP is applied between the inlet and outlet faces of a laboratory rock sample, with zero flow conditions on the edges parallel to the mean flow obtained by confining it in a sheath under pressure. Starting from conventional permeability measurements in three directions and from the measurements of the two components of the viscous forces transverse to the sample, permeability tensor k can be “inverted” by numerical solution of the corresponding boundary-value problem. Since these quantities can be alternatively obtained from numerical solutions of the same flow in a heterogeneous medium, the method can also be used as an upscaling tool in a reservoir simulator.

The invention discloses a multi-phase permeameter and a rock permeability determination method. The multi-phase permeameter comprises an injection system, a cooling system, a model system, a metering system, an automatic control system, a pressure return system, a vacuum pumping system and a data acquisition and processing system, wherein the injection system is used for injecting carbon dioxide and liquid; the cooling system, the automatic control system, the pressure return system, the vacuum pumping system and the model system are used for simulating formation conditions; and the metering system and the data acquiring and processing system are used for date statistic measurement. The method comprises experiments of vacuum pumping, core saturation and displacement, wherein injection rate and injection pressure are changed by an injection pump, so that parameters required for the permeation experiment can be acquired, and salt precipitation capacity generated by desiccation effect can be measured. According to the invention, the operation is simple, automatic control, acquisition and handling by using a computer are realized, and limitations and defects of conventional experimental apparatuses and methods can be overcome.

The invention discloses a horizontal permeameter suitable for soil horizontal contact surface shearing deformation. The horizontal permeameter comprises a support, a test box arranged on the support, a sample chamber positioned in the test box, a vertical compression oil cylinder arranged on the top board of the test box, a transverse compression oil cylinder arranged on an outer side board of the test box, and an inlet water chamber and an outlet water chamber which are arranged at the two outer ends of the sample chamber along the piston action direction of the vertical compression oil cylinder, the inner side board at a water inlet end is formed by an upper transversely movable part and a lower fixed part, and a transverse compression oil cylinder piston acts on the transversely movable part. The horizontal permeameter can be used for researching the horizontal seepage characteristic and the horizontal contact surface wash destroy of a soil horizontal contact surface or a soil and structure horizontal contact surface under shearing deformation conditions.

The present invention includes an apparatus, method and centrifuge permeameter system that includes a hydraulic permeameter adapted for use in a centrifuge; and an automated data acquisition system, wherein the centrifuge permeameter non-destructively determines one or more soil characteristics from a sample of granular material such as soil, rock, and concrete when centrifuged.

The related permeameter to measure soil permeability comprises: a soil sample ring (1), a loading piston (2) with an exhaust channel in (1) for up-down slide, a base (3) with and air inlet and exhaust channel on two sides. Wherein, both exhaust channels of (2) and (3) connect with self GDS pressure controller (5) through high-pressure plastic pipe (9). This invention can obtain the soil permeability on different void ratio and stress.

The invention discloses a test method for measuring plastic concrete permeability coefficient. Six test pieces are manufactured; butter is mixed with coal ash or cement at the mass ratio of 1:2-2.5 to prepare a sealing material for sealing the test pieces and a die trial. The water pressure of a permeameter is added to 0.2 MP once, constant pressure is kept for 6 hours, and the water seepage height is taken by ten moieties by splitting the test pieces. The relative permeability coefficient of the test piece is calculated according to the following formula: Kr=aDm2 / 2TH. The average value of the relative permeability coefficients of the six test pieces is the permeability coefficient of the plastic concrete. The invention fills the blank of the plastic concrete test method, and effectively overcomes the problem that the test result in the mix proportion design of the existing impermeable wall plastic concrete can not truly reflect the practical impermeable ability, thereby better matching the design index with reality.

The invention provides a servo-control earth-rockfill mixture transformation permeameter, comprising an upper end cap, a permeating barrel, a porous disc, a lower end cap, a trolley, a servo water-adding device and a pressure-measuring device; wherein, the upper end cap and the permeating barrel can be sealed and detached; the middle of the upper end cap is provided with a water-injecting pressure pipe which can be used for adding high pressure water after being connected with the servo water-adding device; the two sides of the cylinder permeating barrel are provided with 6 water pressure measuring devices with the same interval consisting of a three-way pipe, a pressure measuring pipe for measuring low water pressure and a water pressure gauge for measuring high water pressure; water can enter into a water catchment empty chamber through the porous disc and flows out from a water outlet; the water outlet can control the water discharging speed by be connected with a water discharge switch. By using the structure, the servo-control earth-rockfill mixture transformation permeameter has the advantages that: the sample is a cylinder with the diameter being 300mm and the height being about 600mm and is earth-rockfill mixture comprising coarse grained rock and earth; water can be added in a sealed servo manner, and the water entering speed and pressure can be servo controlled, thus finishing the permeating tests of both low water head and high water head; the upper part and the lower part of the permeameter can be detached, thus realizing safe, simple and convenient use.

The invention discloses a thin-film permeameter and a measuring method thereof, belongs to the technical field of chemical engineering and relates to a device used for measuring gas permeability of thin films and a measuring method thereof. With an aim to solve the problem that an existing method for measuring gas permeability of the thin films is low in accuracy of measuring results and complicated in measuring process due to gas leak and discharge and temperature changes in the environment, the device comprises a mechanical pump, a molecular pump, a valve, a gas source, a heating band, a vacuometer, a high-pressure cavity, a gas permeation unit, a measuring chamber, a reference chamber and a differential pressure transmitter, wherein the differential pressure transmitter records change law of pressure difference of the measuring chamber and the reference chamber over time, and calculates the gas permeability of the thin films according to the formula Q=Vdp / dt, J=Q / ART and K=Jh / delta P. The device is applicable to accurately measuring the gas permeability of the thin films and measuring process is simple.

The present invention provides a sample chamber for a centrifugal permearmeter for testing permeant conductivity of a porous sample, the sample chamber comprising a rigid outer sleeve; a resilient inner sleeve mountable over the sample and within the rigid outer sleeve; fluid inlet means for introducing fluid between the inner and outer sleeves; sealing means acting between the inner and outer sleeves for maintaining the fluid therebetween; a porous top member for mounting over a top face of the sample and supplying the permeant to the sample, the top being movable with the sample to maintain a radially outward permeant force on the sample as the sample is being spun in the centrifugal permeameter; a permeant supply for supplying the permeant to the porous top; and, a permeant accumulator for receiving and accumulating permeant which has passed through the sample.

The invention discloses a permeameter used for measuring the permeability coefficient of cohesiveless soil, comprising a permeameter main body, a first porous plate, a second porous plate, a water inlet pipe, a water outlet pipe and a sand setting device, wherein, the first porous plate and the second porous plate are arranged in the permeameter main body, and the cohesiveless soil is arranged between the first porous plate and the second porous plate; the water inlet pipe is arranged at one side of the permeameter main body on which the first porous plate is arranged; the water outlet pipe is arranged at one side of the permeameter body on which the second porous plate is arranged; the sand setting device is arranged at the bottom of the permeameter main body; and at least one measuring hole is formed on the permeameter main body along the direction of the first porous plate to the second porous plate. According to the permeameter of the invention, a soil sample which has large sample particles and is suitable for high seepage gradient can be loaded in the test; the permeability test can be carried out by adopting the continuously circulating water; the influence of the air to the water stream in the soil sample can be eliminated with more accurate result. The invention also discloses a permeability coefficient measuring system with the above permeameter.

The invention discloses a soil water-gas collapsibility-consolidation-penetration combined determinator. The determinator comprises a collapsibility-consolidation-penetration permeameter, a water seepage coefficient determination system and an air permeation coefficient determination system. The collapsibility-consolidation-penetration permeameter comprises a base and a cutting ring. The cutting ring is filled with a soil sample. The top end of the soil sample is provided with a pressurization control system. The pressurization control system is provided with a dial indicator for determining displacement of a piston in the pressurization control system and a compression gauge for determining air pressure. The water seepage coefficient determination system and the air permeation coefficient determination system are connected to the collapsibility-consolidation-penetration permeameter through pipe ports. The determinator utilizes a modularization design, can carry out a standard height soil sample test, can prepare soil samples with different heights according to demands and test them and can realize simultaneous determination of a penetration coefficient, an air permeation coefficient, a concretion coefficient, a loess collapsibility coefficient and a penetration coefficient and air permeation coefficient after loess collapse. The determinator has the characteristics of good flexibility, short test period, stable and reliable pressure control, labor and time saving and high cost performance.

The invention discloses a flexible wall permeameter and a use method thereof; the flexible wall permeameter disclosed by the invention comprises a shell; a pressure chamber is arranged in the shell; the flexible wall permeameter further comprises an exhaust bolt, a pressurizing cap, porous stones, a confining stress controller and a back pressure controller; the exhaust bolt is arranged at one side of the top of the shell; upper and lower layers of porous stones are arranged in the middle of the bottom of the pressure chamber; a test sample is arranged between the two layers of porous stones; the pressurizing cap is arranged on the top of the upper layer of porous stones; the back pressure controller is connected with the pressurizing cap; and the confining stress controller is connected with the pressure chamber. According to the invention, the confining stress controller and the back pressure controller are arranged outside the pressure chamber and the pressurizing cap in a connecting manner; experimental data can be clearly read through a controller display screen, so that the detection precision is increased; confining stress and back pressure are controlled within a reasonable range; bubbles in the test sample and a pipeline can be easily discharged within a short time; the saturation state is realized as soon as possible; the experimental preparation period is shortened; and the efficiency is increased.

The invention discloses a flexible wall permeameter capable of measuring volume changes. The flexible wall permeameter comprises a pressure chamber, the top end of the pressure chamber is a pressure chamber top plate, the bottom end of the pressure chamber is a pressure chamber bottom plate, a sample containing chamber is installed in the pressure chamber, a top cap is installed at the top end of the sample containing chamber, and a base is installed at the bottom end of the sample containing chamber; the flexible wall permeameter is characterized by further comprising a volume change sensor and a data collector, the volume change sensor is installed at the pressure chamber top plate and communicated with the interior of the pressure chamber through a pipeline, and the volume change sensor is in junctional communication with the data collector. By means of the flexible wall permeameter capable of measuring the volume changes, the problem of rigid wall permeameter side wall water leakage is solved, and sample volume changes in the penetration process can be monitored in real time; the stability of pore water pressure of the top and the bottom of a sample can be quantificationally measured; permeability coefficient monitoring of different samples in specifications related to geotechnical engineering is achieved.

The invention belongs to the technical field of detecting equipment of soil tests and in particular relates to an automatic detecting and metering device and an automatic detecting and metering method for rock-soil permeability. The device comprises an automatic compensation water tank and a permeameter communicated with the automatic compensation water tank, wherein the permeameter is connected with at least one measuring cylinder unit; the measuring cylinder unit is provided with a vertically arranged measuring cylinder with uniform inside diameter; floaters capable of floating with the ascending of the liquid level are arranged in the measuring cylinder; a plurality of liquid level position sensors capable of sensing the positions of the floaters are arranged on the wall of the measuring cylinder at intervals; and the liquid level position sensors are connected with a programmed electronic control unit. Through the device and by the method, a variable head permeability test function can be realized; the test process completely satisfies the relative national standard and industrial standard regulation; the device can continuously work for 24 hours to automatically detect the record; the batch detection working efficiency of the permeability test is fully improved; and the labour intensity of workers, the detecting work cost and the influence of detection personnel on the detection result is reduced.

The present invention provides a sample chamber for a centrifugal permeameter for testing permeant conductivity of a porous sample, the sample chamber comprising a rigid outer sleeve; a resilient inner sleeve mountable over the sample and within the rigid outer sleeve; fluid inlet means for introducing fluid between the inner and outer sleeves; sealing means acting between the inner and outer sleeves for maintaining the fluid therebetween; a porous top member for mounting over a top face of the sample and supplying the permeant to the sample, the top being movable with the sample to maintain a radially outward permeant force on the sample as the sample is being spun in the centrifugal permeameter; a permeant supply for supplying the permeant to the porous top; and, a permeant accumulator for receiving and accumulating permeant which has passed through the sample.

The invention relates to a plastic concrete permeability test device, which comprises a pressure control cabinet and a plastic concrete permeameter connected with the pressure control cabinet. The test device provided by the invention is characterized in that the plastic concrete permeameter contains a pedestal; the upper portion of the pedestal is provided with a rotatable connecting ring, whichis connected with the pedestal through several external handles; the connecting ring is connected with a pressure chamber through screw thread; the pressure chamber is connected with a top cover through screw thread; the top cover is connected with the pedestal through several columns; the center of the top cover is provided with a drift cap positioned on the upper portion inside the pressure chamber; the upper portion of the drift cap is fixedly connected with the top cover through a movable top cover handle; the pedestal on the bottom inside the pressure chamber is provided with a bottom cap corresponding to the drift cap; the bottom cap is equipped with an osmotic pressure adapter and a lower draining exhaust pipe which penetrate the bottom cap and the pedestal; and the drift cap is provided with a confining pressure pipe, an upper draining exhaust pipe and a volume buret-connecting pipeline which communicate with a test piece of the pressure chamber and penetrate the movable top cover. In the meanwhile, the invention also discloses a test method for the device.

The present invention includes an apparatus, method and centrifuge permeameter system that includes a hydraulic permeameter adapted for use in a centrifuge; and an automated data acquisition system, wherein the centrifuge permeameter non-destructively determines one or more soil characteristics from a sample of granular material such as soil, rock, and concrete when centrifuged.

The invention discloses a permeation method for realizing multi-field coupling and in-situ dry-wet cycle, belonging to the technical field of rock and soil permeation. The method is characterized by comprising the following steps: a. preparing a sample, and placing the prepared sample on a working tank of a pressure chamber of a permeameter; b. simultaneously applying a confining pressure and an axial pressure, wherein the requirement that the confining pressure is greater than the axial pressure is met during the application, and maintaining the pressure values to be stable when the designedpressure load is reached; c. applying a water pressure to the interior of the pressure chamber of the permeameter for one cycle; d. draining and drying; e. repeating the steps c and d, cycling for 1-6times, and ending the test. The permeation method provided by the invention can realize multi-field coupling and is more in line with the actual situation; furthermore, the method can realize in-situdrying and measurement of dryness and humidity of the sample, and guarantees the integrity of the sample structure during the test, thereby being capable of effectively reflecting the actual reactionsituation and guaranteeing the accuracy of the sample permeation; the method can perform accurate cyclic simulation periodically on rock and earth mass affected by the rise and fall of the water level of a reservoir.

Disclosed is a permeameter for in-situ measurement of saturated hydraulic conductivity. The permeameter includes a chamber fixedly installed into a streambed sediment such that the inside of the chamber is filled with a medium, sediment at water-sediment interface. First and second hydraulic head-measuring lines are respectively connected to upper and lower portions of an outer circumferential surface of the chamber, these are designed for measuring a hydraulic head difference of the inside of the chamber. A flexible tube is interconnected the chamber with the storage pipe. A storage pipe is designed to regulate a hydraulic head difference from the chamber and to measure a quantity and a flow rate of water introduced from the chamber under the streambed.

The invention discloses a multi-connected flexible wall permeameter. The multi-connected flexible wall permeameter comprises a support, wherein a transparent cylinder body is arranged in the support; a top cover covers an upper end of the transparent cylinder body; a penetrating fluid conveying device is communicated with one end of a soil test sample through a liquid inlet pipe; a bath foam collection bottle is communicated with the other end of the soil test sample through a liquid drainage pipe; an inner cavity of the transparent cylinder body is connected with a water inlet pipe and a water drainage pipe; an upper end and a lower end of the soil test sample are connected with an air exhaust pipe; a pressure reducing channel is arranged in the top cover and is equipped with a pressure reducing valve; pressurizing branch pipes are communicated with the interior of the transparent cylinder body through the top cover and are provided with check valves; a plurality of flexible wall permeameters are arranged; pressurizing branch pipes of all flexible wall permeameters are all connected with a pressurizing main pipe in a guiding manner; the pressurizing main pipe is connected with a pressurizing pump. The multi-connected flexible wall permeameter is labor-saving in operation, and air pressures of all permeameters can be synchronous and consistent, so that permeability coefficients obtained by the test can be more accurate.

The invention relates to a pressurized variable water head permeameter which comprises a water pressure output part, a water pressure regulation part and a variable water head permeameter. The water pressure output part comprises a frame, a water supplementing tank, a valve, a water pump positioned inside the frame, a water storage tank, a separator, a sensor and a water pressure control panel, wherein the water supplementing tank is connected through a metal connecting pipe and is positioned outside the frame, the water pump, the water storage tank, the separator and the sensor are positioned inside the frame; the water pressure regulation part consists of a water pressure regulation switch, a water pressure gauge and high-strength rubber pipes; the high-strength rubber pipes are respectively arranged among a water outlet pipe a, the water pressure regulation switch, a three-way part and a water inlet pipe of the variable water head permeameter. Because the clay is low in permeability coefficient, the seepage passing through a soil sample is slow and the duration is long under the condition that the water head difference is small. The water pressure input into the permeameter is increased, so that the experiment process can be accelerated, the test efficiency is improved, and the test time is saved.

The invention discloses an expansive-soil permeameter with different overlying loads and variable water pressure of a high-speed rail and a use method of the expansive-soil permeameter with differentoverlying loads and the variable water pressure of the high-speed rail. The expansive-soil permeameter comprises a laterally confined constrained uniform permeation module, a vertical loading module,a variable water-pressure water adding module and a supporting module; the laterally confined constrained uniform permeation module comprises a base, a permeation cylinder, a permeable stone layer, and a cover plate; the vertical loading module comprises a force applicator, a stress meter, and a force transmitting spring; the variable water-pressure water adding module comprises a water supply container, a variable pressure head pipe, a pipe clamp, a capacity adjustment clamp, a water inlet pipe clamp, and a connecting hose; the support module comprises an upright column, an upper beam, a lower beam, a support platform, and a support clamp. The expansive-soil permeameter disclosed by the invention has the beneficial effects of solving the permeability coefficient determination test of theoriginal expansive soil under different overlying loads and the variable water pressure, and being suitable for study on permeability of any cohesive soil, fast in assembly and reliable and stable.

The invention relates to an electronic-clogging experiment device of a geotextile. The device consists of three parts, namely, a penetration test main body device consisting of an experiment table, a permeameter, a piezometer tube and a water head scale, a constant water head supply device consisting of a bracket, an auxiliary water inlet container, a valve, a water supply tube, a constant water head inlet container, a water outlet tube, a constant water head outlet container and an overflowing tube, and a voltage loading device consisting of a direct current power supply, an insulating lead, a metal bolt and a drilling circular metal electrode. By using the penetration test main body device and the penetration test main body device, continuous hydraulic power penetration tests with different hydraulic power gradients can be performed to the geotextile, and continuous electric penetration tests with different hydraulic power gradients can be performed to the geotextile by applying a uniform direct current electric field inside the permeameter through the voltage loading device, so that the influence on the clogging of the geotextile caused by electronic effect can be studied.

The disclosed permeameter for silicon steel magnetic performance comprises: an upper / lower yoke with one fixed and another connected with a drive motor, some coils included excitation coil and measuring coil, an excitation power, and a pressure sensor. Compared with Epstein square coil, this invention can save sample material greatly, reduces measurement error, and can bring much economic benefit.