A leveling clips ruler for eliminating error of structural plane direct shear test

Errors are prone to be produced in the process of sample testing in the indoor structural plane direct shear,which leads inaccurate shear parameter.The structural plane cannot be kept horizontal in the cement mortar is one of the causes.Statistics shows that the most structural planes tilt about 5°.Due to the tilt,the structural plane and the vertical force added by the direct shear apparatus are not perpendicular to each other,causing non-perpendicularity between the normal stress and the shear plane;therefore,the accuracy and the reliability of the test data are significantly affected.In the sample making process,the jaw of leveling clips rule folder is used to fix structure surface,the structure plane is adjusted to horizontal through the leveling bubble to eliminate the errors angle,so as to provide reliable experimental data.