Geosynthetics direct shears correct use method - Database & Sql Blog Articles

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Geosynthetics direct shearing instrument correct use method Geosynthetics direct shearing instrument developed by Tianjin Wan Testing Equipment Technology Co., Ltd. Be sure to do so in the right way when using it. Today, we will introduce you how to use it.

The correct use of geosynthetics direct shears:

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. The sample is bonded to the base by glue. 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

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.

LCD steps:

1

) turn on the power switch

2

) Press the function 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.

When the end of each work shift, the countertops should be completely cleaned. Do the maintenance of the machine for the next operation.