New geotextile direct shear test method and liquid crystal table operation Geotextile Direct Shear Test Method 1. Place the sample flat on a rigid horizontal base located at the bottom of the shear box, ensuring the front end is clamped within the shear zone. The sample should be bonded to the base using glue. After bonding, the specimen must remain smooth, without folds or wrinkles. Any 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 standard sand of pre-defined quality (note: user should prepare the standard sand). The thickness should be 50mm, evenly distributed. The dry density after compaction should be 1750kg/m³. 3. Install the horizontal loading device and apply a normal pressure of 50kPa to the sample. 4. Apply a horizontal load so that the rate of movement between the upper and lower shear boxes is 1mm/min ± 0.2mm/min. Measure the corresponding displacement continuously or indirectly. Record the shear force T and the relative displacement ΔL at intervals of 12 seconds. This can also be done at the beginning of the test until the cut surface reaches 16.5% of the total length, at which point the test ends. LCD Operation Steps: 1) Turn on the power switch. 2) Press the function key to start a new test. 3) Enter the required test speed and press Enter. The screen will display "shear force," "shear stress," "peak," and "displacement." 4) Press the start button to begin the test (i.e., incremental stress, first test normal stress of 50kPa). Once the result is valid, it automatically proceeds to the next level: 100kPa, 150kPa, and 200kPa. 5) The displacement begins to count, and the total contact surface is completed. When the test reaches 16.5%, the machine stops automatically, and the test data is displayed. If the results are correct, press the confirm button to save the data. This detailed procedure ensures accurate measurement and reliable data collection, making it ideal for geotechnical testing and material analysis.
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