The mechanical property of tuff and lapilli tuff by in-situ tri-axial compression test and the validation of the test result

Abstract

This study evaluated the mechanical property of two types of rocks, tuff and lapilli tuff, by using in-situ triaxial compression test, which had been developed by previous researches. The stress-strain relationship including the peak shear strength and residual strength were obtained from the tests. The test results were compared with the test results of in-situ rock test (rock shear test and plate loading test). As a result, the peak shear strength and Young’s modulus obtained from different test methods were approximately equal. Therefore, the validity of the test results obtained from in-situ rock tests was verified from the in-situ triaxial compression test.