Straight shear friction test method and drawing friction test method
Straight shear friction test method
1.
The sample is laid flat on a rigid horizontal base located in the lower portion of the shear box with the front end clamped in front of the shear zone. Glue between the sample and the base (if used)
P80
The alumina standard friction base can be unbonded). After bonding, the specimen should be flat, without folds and wrinkles. Relative slippage between the sample and the base is not allowed during the test.
2.
Install the cutting box: fill the upper shear box with the standard sand of the pre-standard quality (Note: the user of the standard sand), fill the thickness
50mm
. The thickness of the sand should be uniform, and the dry density after compaction is
1750kg
/m 3
3.
Install the horizontal loader and apply the sample
50KPa
(hang the benchmark weight as
50KPa,
Another
3
Standard weight, each additional pressure increases
50KPa
Normal pressure
4.
Apply a horizontal load so that the rate between the upper and lower shear boxes is
1mm
/min
±
0.2mm
/min
The corresponding displacement. Continuous or indirect measurement of shear
T,
Simultaneous recording of the corresponding relative displacement Δ
L,
Interval time is
12S
, can also be encrypted at the beginning, until the length of the cut surface is reached.
16.5%
The test ends.
5.
Steps:
1
) turn on the power switch
2
) The power-on password is
6
One
0.
Press the operation key to open the new test
3
) Enter the speed required for the test and press the Enter key
Screen display: "shear force", "shear stress", "peak", "displacement".
4
Press the start button to start the test (ie: incremental stress, first test normal stress)
50KPa,
The result is valid and automatically enters the next one
100KPa, 150KPa
with
200KPa
)
5
) The displacement starts counting and the total contact surface is completed.
16.5%
When the test is completed, the machine will stop automatically and the test data will be displayed. If the test is correct, press the confirm button.
6
), open the result query, screen test results
7
)
.
Press OK to print and the printer starts working. The test result report is automatically printed.
Pulling friction test method
1
Cut the specimen according to the provisions. The width of the specimen should be slightly smaller than the width of the test chamber. The length of the specimen should be such that the specimen is not broken and determined by the test.
2
Each group of tests should be no less than
3
Block sample.3
,
The end of the sample taken from the test chamber shall be reinforced, and the sample outside the box shall not be greatly deformed during the test.
4
,
According to the density and state of the design requirements, the soil in the lower part of the test box is carefully filled, and the filling height is flush with the seam and the soil surface is leveled.
5
Place the sample on the soil surface, and draw the end from the seam. Pay attention to the symmetry of both sides, then gently lay a layer of soil on the sample to position the sample.
6
Fill the soil of the upper half of the box according to the density and condition required by the design.
7
The end of the sample is placed flat into the tension clamp, and the center is evenly clamped.
8
Put the top cover and apply the normal pressure. The time required for consolidation can be carried out according to the relevant test procedures.
9
,
Adjust the horizontal loading device and test the test parameters required in sequence. Start the test. The up and down arrow keys are used to adjust the desired position of the fixture. The pull start point is when the tension clamp begins to be stressed. Press the start button to read and record the displacement and horizontal pull. The drawing rate can be referred to the working test procedure, and it is suitable for the sandy soil.
0
.5mm
/min
.10
When the pull-out force peaks, it should continue to pull until the pull-out force is stable, and the test can be stopped.
11
Replace one specimen and apply another normal pressure. Repeat the above steps to complete all tests.
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