Triaxial compressive strength test is used for determination of the shear strength characteristics of intact rock core specimens subjected to varying confining stress states acting under constant axial load. Test specimens shall be prepared under the ASTM D4543 standard to determine the dimensions and shape of the sample to be tested. Triaxial compressive strength test is used to determine the shear strength and deformation characteristics of a rock and is used to simulate the natural stress conditions of a rock mass.