1,
Connect the lower water inlet to the water supply pipe to fill the instrument with water, check the instrumentWhether the components of the device are blocked or leaking. After the inspection is completed, lower the water supply tank so that the water level in the instrument is flush with the lower edge of the lower water permeable plate.
2,
Remove the top cover, lay the filter on the lower permeable plate, and apply a ring of water stop material along the contact gap between the barrel wall and the filter.3,
Open all pressure taps to vent them.4,
Sample should be divided3 to 5 layers are filled, and the gradation of each layer should be the same. Filling layer thickness: sand soil can be 2cm ~ 3cm; gravel soil can be 1.5 ~ 2 times the maximum particle size of the sample. If necessary, add water equivalent to 1% to 2% of the sample mass, mix well and then fill.
5,
Each of the weighed samples is evenly layered into the measuring cylinder, compacted with a compacting hammer and reached the required height, and vibration encryption can be used for the weathered stone slag or the crushed earth material.6,
The sample is saturated in the instrument using a capillary saturation method. Adjust the height of the water supply tank so that the water level of the water supply tank is slightly higher than the bottom surface of the sample, and the water supply tank is slowly raised.1cm, should be stabilized for 10min after lifting the water supply tank. As the water level of the sample rises, the corresponding pressure measuring tube is turned on, and the sample is fully saturated and saturated until the water overflows the water outlet. At this time, the water level of each pressure measuring tube should be flush with the water level of the water outlet.
7. According to the fine particle content in the sample, the failure form of the sample seepage deformation is preliminarily judged: when the pipe is damaged, the initial slope of the infiltration should be
0.02~0.03, increment value is 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50,
0.70, 1.00, 1.50, 2.00, later press
The increment of 1.00~2.00, when approaching the critical slope, the incremental value of the osmotic gradient should be reduced as appropriate; when it is the form of fluid failure, the value can be increased appropriately.
8. Raise the water head one by one according to the above regulations. After each rise of the water head, the outlet water should flow out
30min~60min, after the water flow is stable, measure the water level of each pressure measuring tube and measure the water seepage volume by the measuring cylinder. The number of readings and readings under each level of water head should not be less than three times. The interval between each reading and reading should be determined according to the amount of water seepage. It should be 10min~20min, and the temperature of inlet and outlet water should be read. When the water level and water permeability of the three readings are basically stable, the water head can be raised to the next level. Take the three average values ​​close to the reading as the test values. For non-pipes, the time can be extended.
9. Observe the various phenomena that occur during the test, such as the degree of turbidity of the effluent, the bubble emerging, the fine particles jumping, moving or being carried out by the water flow, the suspension of the soil, the seepage flow and the change of the water level of the pressure measuring tube, etc. Carry out a detailed description. When a critical slope occurs or the precursor of the slope is destroyed, the incremental value of the slope should be adjusted in time.
10. When the sample is damaged or the head cannot continue to increase, the test can be ended. For permeation tests that require only a determination of the permeability coefficient, continue to apply after a critical slope has occurred
The test was terminated after the 1 to 2 water head.
11. After the test is finished, close the nozzle, draw the remaining water on the sample, observe the sample change, and test the height of the sample according to the required amount. The sample with load should be unloaded in time and observe the rebound condition. Remove the top cover, absorb the residual water on the sample, and remove the upper permeable plate. Release the remaining water from the instrument and remove the sample. Test the particle grading after the test as needed.
12. While conducting the test, it is advisable to plot the relationship between the osmotic gradient and the seepage velocity. Taking the osmosis slope as the ordinate and the seepage velocity as the abscissa, draw on the double logarithmic coordinate paper, and if necessary, plot the seepage velocity versus time. According to the curve change, the duration of each stage head and the level difference of the head are adjusted in time.
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