192 results about "Wet dry cycle" patented technology

Provided are an atmospheric corrosion test procedure and an apparatus used for the test. The procedure involves a salt spray step for supplying salt content containing chloride ions on the surfaces of test pieces placed in a thermo-humidistat chamber and a subsequent dry-wet cyclic step including a dry sub-step for drying the surface of the test pieces in the thermo-humidistat chamber at a low relative humidity and a subsequent wet sub-step at a higher relative humidity than that in the dry sub-step, which are cycled. The salt content is supplied by spraying the salt water in the salt spray step. An exhaust step for removing the salt mist sprayed inside thermo-humidistat chamber is further inserted between the salt deposition step and the dry sub-step. The quantity of the salt content deposited on the surfaces of the test pieces is controlled by adjusting the quantity of the sprayed salt water.

The invention relates to a rock-soil body shear creepmeter considering a dry-wet cycle and a test method thereof. The invention aims to provide the rock-soil body shearing creepmeter considering the dry-wet cycle with a simple structure and convenience in operation, and the test method thereof. Not only can a shearing creep test of a soft rock or hard soil during a dry-wet cycle process be carriedout, but also a direct shearing test of the soft rock or the hard soil under a dry-wet cycle action can be also carried out. The rock-soil body shearing creepmeter considering the dry-wet cycle is characterized by being provided with a bottom plate, wherein a driven shearing box with an upward opening is arranged on the bottom plate; a rock-soil sample is placed in the driven shearing box; a drive shearing box with a downward opening is arranged above the driven shearing box, and is arranged on the rock-soil sample in a covering way. The rock-soil body shearing creepmeter considering the dry-wet cycle and the test method thereof provided by the invention are applicable to testing mechanical parameters of the soft rock or the hard soil in a dry-wet cycle environment.

The invention belongs to the field of geotechnical engineering, and in particular relates to a compression-shear testing apparatus for a rock in a dry-wet cyclic process. The apparatus comprises an angle-variable compression-shear unit, and a compression machine for vertically applying load onto the angle-variable compression-shear unit; the apparatus also comprises a reservoir, water injection equipment for carrying out moisture saturation treatment on a rock sample in the angle-variable compression-shear unit, and heating equipment for carrying out hot-gas drying treatment on the rock sample in the angle-variable compression-shear unit. The angle-variable compression-shear unit is located in the reservoir, and the reservoir is communicated with the water injection equipment and the heating equipment. By adopting the compression-shear testing apparatus, the integration of rock sample dry-wet cyclic treatment and a shear test is realized, and the apparatus has the advantages of simple structure, convenient operation, low cost, wide application range and long service life; the rock samples in different states after different dry-wet cyclic times can be accurately simulated, shear test research is carried out on the rock samples, and moreover, failure load and displacement of the rock samples in the vertical direction in the shear test process can be recorded in real time.

The invention relates to the technical filed of geotechnical direct shearing apparatuses, and discloses an unsaturated soil slope apparatus for measuring the deformation and suction of soil. The apparatus comprises a slope model case, a data acquisition structure and an environment simulation structure; the upper end of the slope model case is oblique, one sidewall of the slope model case is transparent, and the transparent sidewall is provided with a plurality of index points; the environment simulation structure comprises a water spray structure and a drying structure; and the data acquisition structure comprises a camera and a suction sensor, the camera is arranged outside the transparent sidewall, and the suction sensor is inserted into the slope model case. In a cavity for accommodating unsaturated soil, wet-dry cycle simulation of the water spray structure and the drying structure is carried out, the camera acquires the deformation of unsaturated soil to measure macroscopic mechanical properties, the suction sensor acquires the suction data of the unsaturated soil to measure microscopic mechanical properties, and the apparatus is of great significance for the advanced researches of the mechanic characteristics of water and soil of the unsaturated soil slope under natural conditions and the stability under rain dry-wet cycle.

The invention discloses a concrete seawater environment dry-wet cycle test device. The concrete seawater environment dry-wet cycle test device comprises a dry-wet cycle test box system, a liquid storage system, a master control box and an air compression system. The dry-wet cycle test box system is connected with the liquid storage system through a solution circulation system and connected with the air compression system through a blow pipeline. The master control box controls the dry-wet cycle test box system, the liquid storage system, the air compression system and the solution circulation system. The device is high in automation degree, easy and convenient to operate and convenient to control, solves the problem that solute deposits in existing equipment, and can be widely applied to the concrete dry-wet cycle test in a simulated seawater environment.

The invention provides a soil sample dry and wet circulating test instrument. The test instrument at least comprises a bracket, and a lifting mechanism, a saturated component and a constant-temperature evaporating component, which are fixed to the bracket, wherein the constant-temperature evaporating component is positioned above the saturated component; a soil sample turning mechanism is arranged in the saturated component; the lifting mechanism is used for driving a pedestal to move up and down along the vertical direction; the soil sample turning mechanism comprises the pedestal, two slide rails and more than two supporting plates; the slide rails are fixed to the pedestal; the supporting plates are arranged on the two slide rails; the pedestal is a rectangular square frame; the shape of the two slide rails is the same; each of the two slide rails is shaped like a wavy line; the two ends of the slide rails are respectively arranged on two short sides of the pedestal; a slide block is arranged at each of the two ends of each supporting plate; the supporting plates are arranged on the slide rails through the slide blocks and can slide along the slide rails. According to the soil sample dry and wet circulating test instrument provided by the invention, a soil sample can be turned by the soil sample turning mechanism, so that the soil sample is guaranteed to be more uniform and full in dryness and saturation; the test instrument can treat a plurality of soil samples at one time, the consumed time is little, and the efficiency is high.

The invention discloses a device and a method for testing the mechanical property of the soil which is improved through electrochemistry under the action of dry-wet cycle, which are applied to electrolytically treating viscous soil and testing the mechanical property thereof. The soil is electrolyzed by arranging electrodes at the upper end and the lower end of the shearing box, and the cation replacement inside the soil is achieved, therefore, the water absorption property of the soil is improved, the specific gravity of the combined water and the free water is changed, and the basis is provided for researching the change rule of the water absorption property of the soil on the mechanical property of the soil under the dry-wet cycle. By designing the steam humidification tube inside the shearing box to carry out humidity control, the soil sample is simulated under the dry-wet cycle, and the moisture content probe is arranged in the soil, so that the moisture content change of the soilin the dry-wet cycle can be tested. Through the design of the annular shearing box, the cyclic shearing can be achieved, and the problem of soil missing in the cyclic shearing is avoided, therefore,the test on the shear strength and the mechanical property, and the change rule of the soil under the condition of dry-wet cycle is achieved. The device is ingenious in structural design, convenient to implement, and high in practical value and popularization value.

The invention provides a mass-type rock soil wetting-drying cyclic experiment apparatus and experiment method. The experiment apparatus comprises a shell, a control unit, a wetting-drying conversion device and a weighing unit, wherein the control unit, wetting-drying conversion device and weighing unit are arranged in the shell; the wetting-drying conversion device is provided with a humidifier and a drying unit; the humidifier, drying unit and weighing unit are respectively connected with the control unit through an analog-to-digital converter; the control unit is connected with a digital-to-analog converter; the digital-to-analog converter is connected with the humidifier, drying unit and weighing unit; the weighing unit is arranged below the wetting-drying conversion device; and the control unit is used for receiving a mass signal of the weighing unit, performing wetting-drying judgment, and sending a control signal to the wetting-drying conversion device. The experiment apparatus and experiment method provided by the invention are specially used for wetting-drying cyclic experiments in geotechnical engineering to enhance the automation degree and precision of the experiment.

The invention provides a wetting-drying cycle tester for a water rock. The wetting-drying cycle tester comprises a test chamber and a support. The support is installed at the bottom of the test chamber. Two opposite vacuum test chambers and two opposite drying chambers are fixed in the top of the test chamber. The two opposite vacuum test chambers are connected with a vacuum pump and a bi-directional water pump; the bi-directional water pump is connected with a liquid storage tank installed in the test chamber through a water control valve; the lower end of the test chamber is provided four test chamber chassis; and the bottom surface of the chassis of the test chamber is equipped with a rotatable automatic lifting rotary shaft. The tester realizes automatic control by a control unit composed of a temperature sensor, a pressure sensor, a motor, a PLC controller and a relay. The tester realizes the automation of the testing process, prevents tedious manual operations, shortens test time, accelerates testing process and reduces the error caused by manual operations.

The disclosure relates to a device and method for a dry-wet cycle simulation test of concrete in a tidal zone and a splash zone. A main structure includes a liquid storage tank, a test chamber, a communicating pipe, air holes of the liquid storage tank, air holes of the test chamber, ceiling fans, steel pipes, a support frame, an upper water level sensor, a lower water level sensor, a temperature and humidity sensor, a temperature sensor, a chamber body support, a communication valve, a pipe support, a water inlet pump, a water inlet valve, a water outlet pipe, a water outlet pump, a water outlet valve, spray water pipes, spray heads, and a control box. The control box can control and record test parameters in real time, so that the boundary between the tidal zone and the splash zone is clear.

The disclosure relates to a soft rock shear rheological test system with simulation of coupled rainfall seepage and blasting vibrations, which is at least provided with a loading device and a shear box. The loading device includes a frame (2), a normal static load electric cylinder (1) disposed on a top of the frame (2) and a normal dynamic load electric cylinder (16) disposed on a lower portion of the frame (2), a horizontal static load electric cylinder (5) and a horizontal dynamic load electric cylinder (12) disposed on both sides of the frame (2), and a reaction post (10). This test system can perform a dry-wet cycle operation on the test specimen without disassembling the shear box during the shear rheological test, and can truly simulate influences of rainfall seepage and blasting vibrations on the shear rheological effect of soft rock.

The invention relates to a similar material for simulating an expansible tunnel surrounding rock and a preparation method of the similar material. The similar material comprises the following components with different permeation grades: high-permeability expansive soil, medium-permeability expansive soil and low-permeability expansive soil, wherein the high-permeability expansive soil comprises 96-105 parts of coal ash, 11-17 parts of bentonite and 8-10 parts of silicon oil; the medium-permeability expansive soil comprises 95-104 parts of coal ash, 17-25 parts of bentonite and 8-11 parts of silicon oil; and the low-permeability expansive soil comprises 96-105 parts of coal ash, 25-30 parts of bentonite and 9-12 parts of silicon oil. According to the preparation method, bentonite with different permeation rates can be proportioned to carry out a model experiment, not only can the drying and wetting cycle field condition be simulated, but also the mechanical and deformation characteristics of the expansible surrounding rock can be met; and the local materials are used, so that the materials are conveniently obtained and are saved. The bentonite is a rock mainly composed of montmorillonite so as to have extremely high expansibility. Non-combusted carbon granules in the coal ash are of loosen porous structures so as to have high permeability and an expansion inhibiting effect, and furthermore, the permeability and expansion grade of the similar material can be regulated by changing the ratio.

The invention discloses a rock soil wetting-drying cycle test device and a use method thereof. The device is characterized by comprising a loading device (1) arranged on a weighing device (2) and a heating device (3) used for heating a sample device in the loading device (1), the loading device (1) comprises a base (4) horizontally arranged on the weighing device (2), the base (4) is sequentially and vertically provided with a fixed baffle (5) and a movable baffle (6) from left to right, the bottom end of the fixed baffle (5) is fixedly arranged on the base (4), the bottom end of the movable baffle (6) is in lap joint with the base (4), and the base (4) is provided with a weir (12) used for limiting the position of the movable baffle (6). By means of the rock soil wetting-drying cycle test device and the use method of the device, loads can be applied to soil, and the water content and deformation of soil body can be precisely monitored in real time.

The invention provides a soil mass dry-wet circulating annular shearing instrument capable of measuring humidity. The soil mass dry-wet circulating annular shearing instrument comprises a workbench, a main shearing box, a vertical loading device, a rotating power driving device and a dry wet circulating device, wherein the main shearing box is arranged on the workbench and a dial indicator is arranged at the top end of the vertical loading device. The dry-wet circulating device provided by the invention solves the problem that the conventional annular shearing test instrument is difficult to research the deforming property of the annular sample in a dry-wet circulating process; the hygrometer is used for measuring the humidity in the wet circulating process; the top tray is detachable; the space for the sampling process of the annular sample is ensured; the damage to the annular sample in the sampling process is effectively reduced; a first force transfer shaft passes through a through hole a in a cross bar of the top tray and moves up and down along the vertical direction, so that the pressurizing cross bar can move up and down and the deforming displacement space for vertically loading the annular sample in the test process is ensured.

The invention discloses a wetting-drying cycle testing device for soil three-directional soaking under the action of a load. The wetting-drying cycle testing device comprises a humidifying mechanism,a drying mechanism, a weighing mechanism, a pressurizing mechanism, a measuring mechanism and a testing cylinder mechanism; the pressurizing mechanism is placed on a bearing plate of the weighing mechanism; a soaking box of the humidifying mechanism is placed on a base of the pressurizing mechanism; the testing cylinder mechanism is placed in the soaking box; a pressurizing rod in the pressurizingmechanism is positioned on a male plate at the top of the testing cylinder mechanism; the measuring mechanism is fixed on a female plate at the testing cylinder mechanism and a pressurizing lever ofthe pressurizing mechanism respectively by a dial gauge strut and a clamping device; and the drying mechanism is arranged above the pressurizing mechanism. The device implements a combined effect of soil soaking and the load in the soil three-directional soaking and soil wetting-drying cycle processes; an overlying load can be determined according to burden pressures applied to different filled horizons of a roadbed, and a pavement structural layer and a weight of a vehicle load can be considered; in the wetting-drying cycle process, moisture content of soil can be monitored in real time without disassembling the overlying load; and the working condition consistent with the field is implemented.

The invention discloses a test device for a fracture evolution law of a pre-disintegrated carbonaceous mudstone under a dry-wet cycle condition. The device comprises a drying system and a humidification system. The humidification system is composed of a triaxial apparatus saturator, a vacuum saturation cylinder, a water bucket and a top plate, wherein a bottom plate is provided with the vacuum saturation cylinder and the triaxial apparatus saturator is placed on the middle thereof, and the water bucket and an oil pump are arranged at both sides of the vacuum saturation cylinder respectively. The drying system is composed of an electronic scale, bulbs, a fan, a vent hole, a top plate and a separator. The electronic scale is arranged on a bottom plate, a soil sample is placed on the electronic scale, the electric fan is arranged on a box wall of the system, a digital camera is arranged at the middle of the top plate, and the top plate is symmetrically provided with two bulbs and a vent pipe. The test device for the fracture evolution law of the pre-disintegrated carbonaceous mudstone under the dry-wet cycle condition has the advantages that the degree of automation is high, drying and humidifying are relatively uniform, the operation of instruments is simple and the efficiency is high.

The invention discloses a dry-wet cycling ultraviolet irradiation automatic corrosion test chamber and test method for simulating degradation of organic material in a tide zone in a marine environment. A parallel ultraviolet source system, an adjustable type sample hanging frame and a temperature detection system are arranged in a chamber body, an electric lifting device is arranged just at the center of the top surface outside the chamber body, the adjustable type sample hanging frame is connected just to the downside of the electric lifting device in a rigid manner, and a corrosion sample is mounted on the adjustable type sample hanging frame; a ventilation cooling system and a master control system are also arranged on the top surface of the chamber body; the adjustable type sample hanging frame is composed of adjustable bolts and two identical sample racks; each sample rack comprises an adjustable sample hanging frame support rod, a sample pedestal and a transverse support rod, and the corrosion sample is mounted on the sample pedestal; the dry-wet cycling period, an ultraviolet source, a temperature probe and the ventilation cooling system are controlled by the master control system through coordinated control, and the electric lifting device automatically ascends and descends at fixed time, thus, the degree of automation is high, and the reliability of test results is improved.

The invention discloses a device and a method for simulating influences of drying and watering cycle action generated by water level variation of a fluctuating belt of a reservoir on reservoir bank slope rock masses. The device comprises a test chamber and a sample bracket arranged in the test chamber; one end of a screw rod is mechanically connected with a motor outside the test chamber, and the other end of the screw rod extends into the test chamber; the screw rod is provided with impellers; the upper end of the test chamber is provided with an admission pipe, an air release valve and a rock adding hole; the rock adding hole is provided with a top cover; a water outlet is formed in the lower end of the test chamber; a flow heater is arranged in the test chamber; a ventilation hole is formed in the side face of the test chamber; the ventilation hole is communicated with an air blower. The method comprises the step of repeatedly conducting a rock sample wet environment test and a rock sample dry environment test so as to simulate a test environment in the test chamber more truly. The device and the method disclosed by the invention that more accurate tests are realized by simulating different flow rates, water pressure states and different periods of drying and watering cycle, so that the controllability of test variables is higher, and follow-up related test study can be conveniently performed.

The invention discloses a formula of anti-corrosion concrete used for a filling pile and a preparation method of the anti-corrosion concrete. Ordinary Portland cement and two-stage coal ash are adopted as cementing agents for concrete, and an appropriate amount of high molecular material polyacrylate and sodium nitrite are added to be used as modified materials for concrete, so that the concrete, with the function of preventing the erosion of sulfate and chloride ions, for the filling pile is prepared. The doping amount of the coal ash is given by adopting a computation method, so that the design of mix proportion is more reasonable; the concrete has better workability, and the working performance of the concrete for the filling pile is guaranteed; a chloride ion penetration experiment proves that the electric flux is quite low, and accordingly, the concrete has higher compactness; especially, after the concrete is put into a sodium sulfate solution of 10% and subjected to dry-wet cycling for 150 times, the compressive strength ratio is still 0.92, and the surface of a concrete briquette is complete without loss basically; the materials are easy to obtain, the preparation method is simple, the cost is low, and positive significance on the environmental protection is achieved.

The invention relates to a device and a method for measuring a water and soil characteristic curve under dry and wet circulation. The device comprises an experiment part, wherein the experiment part is arranged in Micro-CT detection equipment; the experiment part comprises a soil sample chamber, a suction force applying part and a connecting pipeline; a first base is arranged at the bottom part ofthe soil sample chamber; the suction force applying part comprises a water storage chamber, an organic glass tube and a second base; the organic glass tube is connected below the water storage chamber through a valve; the second base is arranged under the organic glass tube, and is connected with the first base through the connecting pipeline; the suction force applying part is fixedly connectedwith a fixture on an iron stand through the iron stand; a laser displacement meter is arranged on the iron stand, and is used for measuring the change of water level in the organic glass tube.