DLY-1 coarse-grained soil vertical permeability deformation instrument - Database & Sql Blog Articles
STD-CSR-1
HT7550-1
Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle
DLY-1
Coarse Grain Vertical Permeability Analyzer
This test follows the standard DL/T5356-2006, which outlines the procedure for testing coarse-grained soil in hydropower and water conservancy projects. The method involves osmotic flow from bottom to top and is specifically designed for coarse-grained soils. It helps determine key parameters such as permeability coefficient, dry density, porosity, osmotic gradient, and seepage flow rate.
Technical Parameters:
- Test tube specifications: φ300 mm
- Test tube height: 340 mm
- Water supply tank specifications: φ510 mm, height 500 mm
- Measuring cylinder: 1000 mL
- Measuring cylinder: 100 mL
- Total weight: Not specified
Instructions:
- Connect the lower water inlet to the water supply pipe, fill the instrument with water, and check for any blockages or leaks. Lower the water supply tank so that the water level inside the instrument matches the lower edge of the permeable plate.
- Remove the top cover, place the filter on the lower permeable plate, and apply a water-stop material around the gap between the barrel wall and the filter.
- Open all pressure taps to release air.
- Divide the sample into 3–5 layers, ensuring each layer has similar gradation. For sand soil, each layer should be 2–3 cm thick; for gravel, it should be 1.5–2 times the sample size. If needed, mix 1%–2% water by weight before filling.
- Evenly distribute the weighed samples into the measuring cylinder, compact them using a hammer, and reach the required height. Vibration compaction can be used for weathered stone slag or crushed earth materials.
- Saturate the sample using a capillary method. Adjust the water supply tank so that its water level is slightly above the sample’s bottom, then slowly raise it by 1 cm and maintain stability for 10 minutes. As the water level rises, open the corresponding pressure tubes until the sample is fully saturated and water overflows from the outlet.
- Based on the fine particle content, estimate the failure type (pipe or fluid). For pipe failure, start with an initial slope of 0.02–0.03, increasing in steps of 0.05, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.70, 1.00, 1.50, 2.00. For fluid failure, adjust the increments accordingly.
- Raise the water head step by step. After each increase, allow 30–60 minutes for stabilization. Measure the water levels in the pressure tubes and record the seepage volume using the measuring cylinder. Take at least three readings per level, spaced 10–20 minutes apart. Also, measure the temperature of the inflow and outflow water.
- Observe phenomena like turbidity, bubbles, movement of fine particles, suspension, seepage flow, and pressure changes. Document everything carefully. Adjust the slope increment if critical conditions arise.
- Stop the test when the sample fails or the water head can no longer be increased. For tests only requiring permeability coefficient, continue after reaching the critical slope for 1–2 more levels before stopping.
- After the test, close the nozzle, drain the remaining water, observe sample deformation, and measure the sample height. Unload the load and monitor rebound. Remove the top cover, absorb residual water, and take out the upper permeable plate. Drain the instrument and remove the sample. Perform particle grading analysis if needed.
- Plot the relationship between osmotic gradient and seepage velocity on a double logarithmic scale. Adjust the head levels and time intervals based on the curve behavior. Ensure results align with DL/T5356-2006 standards.
Finally, clean the equipment for future use.
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