New standard pore pressure bleeding instrument

JT/T946-2022New standard pore pressure bleeding instrument
D1 experimental instrument
D. 1.1 Pressure filter container, with an inner diameter of 40mm and a volume of 250mL.
D. 1.2 Drainage pipe, a hard plastic pipe with an outer diameter of 20mm and a length of 240mm, sealed at the top.
D. 1.3 Filter screen, 325 mesh.
D. 1.4 The water collection cylinder has a capacity of 10mL and a division value of 0.2mL.
D. 1.5 can provide compressed air cylinders with a maximum pressure of 0.80MPa. Configure Z reading to be no less than
1.0MPa, Z small scale
A pressure gauge with a value of 0.02MPa.
D.2New standard pore pressure bleeding instrumentExperimental steps
D. 2.1 Insert the drainage pipe with the filter installed into the sealing seat hole, and then tighten the steel cylinder with the sealing seat.
D. Inject 200mL of evenly mixed grouting material slurry into the fully assembled pressure filter container at the bottom,
And record its volume V0, accurate to 0.2ml.
D. 2.3 Install and tighten the upper sealing cover, place it vertically on the bracket, let it stand for 10 minutes, and connect the upper end for compression
Air, open the compressed air valve and quickly increase the pressure to the test pressure.
D. 2.4 After maintaining the test pressure for 5 minutes, close the compressed air valve to relieve pressure and slightly tilt the funnel to make it
All the bleeding in the lower bleeding tube flows out, record the bleeding volume V1, accurate to 0.1mL.
D. 3. Calculation and value selection of experimental results
D. 3.1 Calculation of pressure bleeding rate
The pressure bleeding rate is calculated according to equation (D.1):
Myl=V1/v0x100 %
(D.1)
Where:
Myl pressure bleeding rate;
The volume of bleeding collected by the VI collection container, in milliliters (mL);
The volume of grouting material slurry before VO testing, in milliliters (mL).
D. 3.2 Test result values
The arithmetic mean of two consecutive test data (accurate to 0.1%) should be taken as the test for pressure bleeding rate
result.