压实度对脱硫石膏动强度和动孔压影响试验

为研究压实度对脱硫石膏动强度与动孔压特性影响,对压实度为0.85、0.90和0.95三组脱硫石膏进行等压固结不排水振动三轴试验,试验围压为100 kPa、200 kPa和400 kPa。结果表明：随压实度增大,脱硫石膏颗粒间作用力愈强,颗粒联结骨架越不容易破坏,脱硫石膏动强度越大,动孔压增长越慢;试验压实度范围下,脱硫石膏动剪应力比和动内摩擦角均与压实度呈线性相关;试验用脱硫石膏可分类定名为低液限粉土,其动强度曲线和动孔压发展模式均与常规粉土类似,分别可通过幂函数和对数函数表征,经F值试验法检验,其统计回归显著性水平均为"高度显著"。

Experimental study of the influence of compaction degree on dynamicstrength and dynamic pore pressure of desulfurization gypsum

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."