【摘要】 本实验为低、中水平放射性废物浅地层处置安全评价提供现场土壤的物理化学参数。采样深度在 0 .5～ 9.1m范围内 ,每个样品进行 10项测定 :矿物组成、粒度分布、密度、总孔隙度、有效孔隙度、给水度、持水度、渗透系数、阳离子交换容量、含水量。采样区植物根系发育良好 ,在 0 .55～ 2 m处发现洞穴。土壤颗粒的矿物组成以长石 (～ 4 0 % )和石英石 (～ 2 7% )为主。化学组成的主要成分为 Si O2 (～ 6 0 % )、Al2 O3(～ 11% )和 Fe2 O3 (～ 3.2 % )。土壤颗粒组分以 0 .2～ 0 .0 2 mm为主 (约 50～ 70 % )。该土为砂质粘壤土 ,p H=8左右 ,土壤的干容重为 1.2 7～ 1.4 8t/m3 ,总孔隙度为 50 %左右 ,渗透系数在 (0 .92～ 4 .3)× 10 -4 cm/s之间 ,阳离子交换容量为 12 .17～ 2 8.2 6 meq/10 0 g更多还原

【Abstract】 The objective of this work is to provide physical and chemical parameters of in situ soil for the project of the safety assessment of shallow land disposal of low and intermediate level radioactive waste. Sampling depth was from 0.5 to 9.1 m. For each sample ten items were determined: mineral composition, particle size distribution,density, porosity, effective porosity, specific retention and specific yield, permeability coefficient, positive ion exchange capacity and water content. It is seen that the root system of the plant is well developed at the sampling area. Pores and holes were found at depth of 0.55~2 m or more. The soil is mainly composed of feldspar (about 40%) and quartzite (about 27%). Chemically, it is SiO 2 (60%), Al 2O 3 (11%) and Fe 2O 3 (3.2%). Particle size of the soil is mainly in the range of 0.2～0.02 mm (about 50%～70%).Typical name of the soil is sandy clay loam. The pH value is around 8. Dry bulk density of the soil is 1.27～1.48 t/m 3. Total porosity is about 50%. The permeability coefficient in depth from 0.5 to 9.1 m is in the range of (0.92～4.3)×10 -4 cm/s . The positive ion exchange capacity ranges from 12.17～28.26 meq/100 g. (更多还原