中文摘要：

以与棕壤土穿插分布的草甸土为研究对象,采用室内冻融循环试验得出不同冻融循环次数与土壤含水率条件下草甸土容重、孔隙度、渗透性以及抗剪强度等物理力学性质的变化规律。结果表明：随冻融循环次数的增加,土壤容重、粘聚力先减小后增大,之后趋于稳定,内摩擦角略有增大;而孔隙度、渗透系数则先增大后减小,之后趋于稳定,当循环次数在1～5次之间,孔隙度、渗透系数增大较明显,但增大幅度减小;在相同冻融循环周期条件下,随含水率的增大,土壤容重、土壤孔隙度、土壤渗透系数、土壤粘聚力和内摩擦角均呈现出减小的特征。

英文摘要：

Meadow soil with an interspersed distribution of brown earth was studied.The variation of physical and mechanical properties of the meadow soil,such as bulk density,porosity,permeability and shear-resist strength were obtained by indoor freeze-thaw cycles experiment under different freeze-thaw cycle frequency and moisture content of the soil.The result showed that both bulk density and cohesion decreased first then increased later,and then tend to be stable with the increase of freeze-thaw cycles.Internal friction angle rose slightly.The porosity and permeable coefficient rose first went down later,and then tendedtobe stable.Porosity and permeable coefficient increased obviously but the increasing rate of porosity and permeable coefficient declined with ascent of freeze-thaw cycles when freeze-thaw cycles changed from 1 to 5.Under condition of the same freeze-thaw cycle,soil physical and mechanical properties,bulk density,porosity,permeable coefficient,cohesion and internal friction angle dereased with the increase of water content.