Technical parameters and test methods for direct shear tester on coarse-grained soil - Master's thesis - Dissertation

Kaixin micro test

Test - lowercase jpg

Test probe PH-5H

meets the

DL/T5356-2006

The test procedure for coarse-grained soil in hydropower and water conservancy projects adopts the stress-controlled flat push method, which is suitable for the fast-soil test of the coarse-grained soil itself, the weak contact surface in the coarse-grained soil and the contact surface of concrete and foundation soil.

one.

Technical Parameters:

1.

Cutting specifications:

300

×

300mm

2.

Dial indicator

2

One:

0-5mm 0-10mm

Accuracy:

0.01mm

3.

Maximum strength of jacks and pressure gauges:

30KN

4.

Total Weight:

220Kg

two.

experiment method:

1.

Place a pad on the top of the test piece. When the top of the test piece is not flat, fill it with sand and compact it, or fill it with cement mortar.

2.

According to the maximum vertical load, the reaction device is selected, and the example device for the vertical load and the shear load is supported according to the installation requirements of the dry device. When testing in the test hole, the top and side walls of the test hole can be used as the reaction force.

3.

The roller row, the pad, the jack, and the vertical column are placed on the pad once and connected with the reaction device, so that the centers of the components are on the same axis.

4.

Through the magnetic table on the steel beam, the vertical displacement and horizontal displacement side tables are placed on the top of the sample and the thrust surface symmetry, and the side table should not be less than

2

One. The fulcrum of the steel beam should be outside the influence zone.

5.

Adjust the displacement side table and read the initial reading. Adjust the horizontal jack axis according to the settlement amount.

6.

According to the estimated maximum shear load

8-10

Stage application, immediately after the application of various levels of load, read the shear displacement and normal displacement,

5min

After reading again, the next-stage shear load is applied. When the shear displacement is significantly increased, the amount can be reduced. The applied load before the peak should not be less than

8

level

7.

When the shear load peaks, the peak shear load should be recorded and the shearing should continue until the shear displacement reaches the side length or diameter of the pattern.

10

% end the test. When the shear load has no peak, the shear displacement can be up to the side length or diameter of the sample.

10

Shear load at % as the damage value

8.

At the same time as the experiment, the phenomenon occurring in the test should be described in detail, including the ground uplift, subsidence, crack development, and sound in the sample.