The test is performed by deforming a specimen at a controlled strain rate on or near a single shear plane determined by the configuration of the apparatus.
Shear box equipment consisting of: The box should be divided into two parts horizontally, with suitable spacing screws. Loading frame, to distribute the load from the yoke over the specimen normal to the shear plane.
Set of weights for the normal load.
Proving ring with dial gauge accurate to 0. Spatula, straight edge, sample trimmer. Prepare the specimens so that the moisture loss is negligible.
Trim oversize specimens to the inside diameter of the direct shear device and to the length of the trimmer. Extreme care shall be taken in preparing undisturbed specimens of sensitive soils to prevent disturbance of their natural structure.
Determine the initial mass of the specimen for subsequent use in determining initial moisture content. If specimens of compacted soil are used, they shall be compacted to the desired moisture density conditions. Prepare at least three samples with the help of sample trimmer. Fix the upper part of the shear box to the lower part in saturation container and insert the lower block.
Carefully place the sample in the shear box and insert the upper loading block in place. Place the box in its proper position on the shearing machine. Mount the loading yoke on the steel ball, placed on the loading block, and hang 10 kg normal load.
Cyclic simple shear WF Sample in the cyclic simple shear WF Scheme of the sample in the Cyclic simple shear W Set up parameters: This stage of the software allows you to select the type of test parameters you wish to carry out for example: Consolidation stage force pressure Shear stage axial mode to be controlled in stress or constant height. Large shear testing machine: Controls soil mechanics testing equipment. Enter now! Construction, Testing machine for the construction industrial, universal testing machine, China construction materials test equipment market.
Apply shear force so that the loading knob just touches the top portion of the shear box and a very small load is applied. Remove the fixing screws pins holding the upper and lower part of the box together, and raise the upper half box slightly larger than the largest soil particles in the sample by advancing the spacing screws.
Then back off the spacing screws so that they clear the bottom half of the box. Adjust the proving load ring dial to read zero and apply the shear force and shear the sample slowly at a constant rate until the maximum shear force is reached at the failure of the sample. Repeat the test on identical samples under increasing normal loads of 20, 30, 40 kg, etc.
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DIRECT SHEAR BOX AND RING SHEAR TEST COMPARISON: WHY DOES INTERNAL ANGLE OF FRICTION VARY Figure 1. Typical stress-strain curve showing the . More than 12,+ ASTM standards are used worldwide to improve product quality, enhance safety and facilitate trade. You can purchase individual standards; a volume that groups like standards together; a section that's comprised of several volumes covering an industry segment; or the entire collection.
Direct shear testing is covered in ASTM standard D, "Standard Method for Direct Shear Test on Soils under Consolidated Drained Conditions". most direct shear devices because the shear box is typically too large and heavy to be handled conveniently.
Instead, a special trimming ring is used. A direct shear test is a laboratory or field test used by geotechnical engineers to measure the shear strength properties of soil The test is performed on three or four specimens from a relatively undisturbed soil sample.
A specimen is placed in a shear box which has two stacked rings to hold the sample;.