Geosynthetics puller test method - Database & Sql Blog Articles

TSY-13 Geosynthetics Drawing Instrument

The TSY-13 geosynthetics drawing instrument is designed to measure the frictional resistance between geosynthetics and surrounding soils, as well as their pulling resistance characteristics. It is suitable for a wide range of soil types, including different soil conditions and various geotextiles, geomembranes, geotechnical belts, and geogrids.

Standards Compliant:

• ISO 12957.1
• GB/T 17635.1
• ASTM D5321
• JTGE50 T1129
• SL/T 235-2012

Key Features:

• High precision stepper motor shear rate control
• Easy-to-use normal pressure application system
• Large LCD screen with Chinese interface for intuitive operation
• Computer connectivity for data control, analysis, and report generation

Technical Parameters:

• Inner diameter of the pulling box: 290 × 290 × 290 mm
• Force accuracy error: ≤ ±0.3%
• Force range: 0–10 kN
• Normal pressure range: 0–200 kPa
• Horizontal drawing rate: 0.5 mm/min
• Horizontal pull displacement: 0–30 mm
• Displacement accuracy error: ≤ ±0.3%
• Power supply: 220V, 50Hz

Testing Procedure:

1. Cut the specimen according to the specified dimensions. The width should be slightly smaller than the test chamber, while the length must ensure that the specimen does not break during testing.
2. Each test group should include at least 3 samples to ensure reliable results.
3. Reinforce the ends of the specimen before placing it in the test chamber. Ensure that the sample outside the box remains undistorted during the test.
4. Fully fill the lower half of the test box with soil, matching the required density and condition. Level the surface to be flush with the seam.
5. Place the specimen on the soil surface and align the end from the seam. Ensure symmetry on both sides, then gently cover the sample with a thin layer of soil to secure its position.
6. Fill the upper half of the box with soil according to the design specifications.
7. Secure the specimen end into the tension clamp, ensuring it is centered evenly.
8. Place the top cover and dial indicator, apply the normal pressure, and allow consolidation time as per the test procedure.
9. Adjust the horizontal loading device and use the LCD display to set the desired test parameters. Start the test once the fixture is properly positioned.
10. Begin the test when the tension clamp starts applying force. Use the up/down arrow keys to adjust the fixture position as needed.
11. Record the displacement and horizontal pull force as the test progresses. Maintain a consistent drawing rate, preferably 0.5 mm/min for sandy soils.
12. Continue the test until the peak pull-out force stabilizes, then stop the process.
13. Repeat the steps with a new specimen and apply a different normal pressure to complete all tests.

Calculation Methods:

The interface pull friction strength can be calculated using the following formula:

Ï„p	= Pull friction strength (kPa)
Tp	= Measured peak horizontal total pull (kN)
L, B	= Length and width of the buried specimen (m)

Equation (17.5.1)

Calculate the drawing friction strength under each normal pressure level and plot the τ_p~σ curve.

Determine the drawing friction coefficient (f) of soil-geosynthetic materials using the formula below:

f = τp / σ

Equation (17.5.3)

σ	= Normal pressure (kPa)
Ï„p	= Corresponding drawing friction strength (kPa)

The experiment is now complete. All necessary data has been recorded and analyzed for further evaluation.