Abstract:To study the effect of degree of compaction on the dynamic strength and dynamic pore pressure of desulfurization gypsum, a series of undrained dynamic triaxial tests were carried out on three groups of desulfurization gypsum, with compaction degrees of 0.85, 0.90, and 0.95. The confining pressures were 100, 200, and 400 kPa, respectively. Test results showed that, with increasing compaction degree, the connected skeleton of particles of desulfurization gypsum is more difficult to destroy, and the dynamic strength and dynamic pore pressure of desulfurization gypsum increase, though the latter increases slowly. The dynamic shear stress ratio and dynamic inner friction angle of desulfurization gypsum show a linear relationship with the compaction degree. The tested desulfurization gypsum can be classified as a low-liquid-limit silt. Curves of dynamic strength and dynamic pore pressure were similar to those of conventional silt, which can be regressed by power function and logarithmic function, respectively. Through verification with the F test method, the significance level of the statistical regression was "highly significant."