为综合评价水泥改良泥质板岩粗粒土的力学性质改良效果，利用大型静动三轴仪对改良土和未改良土开展不排水条件下的循环动力加载和单调加载试验。研究该改良土的循环动力特性和中低应变率单调加载下的静、动力学特性。研究表明，对于循环动力加载试验，围压和加载频率均是影响改良土动弹性模量和阻尼比的重要因素；循环动应力强度和破坏振次的对数近似呈线性递减关系；随着应变率增加，水泥改良泥质板岩土的静动应力强度之比显著增加。相对未改良土，改良土的刚度显著提高，而黏滞性减弱；改良土动应力强度的应变率效应显著增大；改良土的静力强度有了显著提高。改良土的内摩擦角和未改良土的相差不大，而它的黏聚力较未改良土有了很大的增加。水泥改良，泥质板岩粗粒土后的静、动力学性质得到提高，改良效果良好。

To comprehensively evaluate the improvement effects of cement improvement on mechanical properties of argillaceous-slate coarse-grained soil, cyclic dynamic loading and monotonic loading tests under undrained condition are conducted using large-scale static-dynamic triaxial apparatus. The cyclic dynamic responses of the modified soil and the static and dynamic properties under the monotonic loading with medium and low strain rates are examined. The results show that, in cyclic loading tests, both the confining pressure and the loading frequency are the key factors influencing the dynamic elastic modulus and the damping ratio, respectively. The dynamic strength under cycle loading decreases in logarithmic scale with cycle number. The ratio of dynamic strength to static strength of cement-improved argillaceous-slate coarse-grained soil under monotonic loading increases significantly with the strain rate increasing. Compared with the properties of untreated soil, stiffness of improved raises remarkably whereas viscous damping decreases. The effect of strain rate on strength under monotonic loading becomes remarkable. The static strength also increases greatly. There is no difference in the internal friction angles in soil treatment while the cohesion increases significantly through the cement.