摘要
采用渗水、注水、压水、抽水及室内渗透试验等多种测试方法,对我国华南某一预选低中放废物处置场内各岩土层的渗透特性进行分层测试,通过多种方法的综合研究得出处置场地内各岩土层的渗透系数,并基于计算结果评价各岩土层的渗透性能,指出区内微风化花岗岩可作为低中放废物的处置底板,中等风化花岗岩可作为备选处置底板,而冲积黏土则是处置单元的理想回填和覆盖材料;强风化花岗岩、全风化花岗岩和冲积粗砂由于渗透性相对较好,处置单元的设计和建设中应避免放射性核素渗漏到上述层位的可能性。该研究为正确获得低中放废物处置场址内岩土体的渗透性能提供了有益的借鉴。
The permeability of the rock and soil layers of a potential site in southern China was studied through integrated use of the pit permeability test,injecting test,water pressure test,pumping test and laboratory permeability test.The values of the permeability of different rock and soil layers were calculated.The permeability for each layer and the functions of rock and soil layers for the site construction were evaluated.The results indicate that the slightly weathered granite can be used as the base rock for the disposal of low and intermediate level radioactive waste（LILW）,the moderately weathered granite can be used as the backup base rock,and the alluvial silty clay can be used as the backfill materials of the disposal units.However,the disposal units should be designed and built carefully to avoid leakage of radionuclides into the strongly and completely weathered granites,and the alluvial coarse sand,because they have relatively large permeability.This study presents an effective method for obtaining the permeability of rock and soil mass of LILW disposal siteses.
出处
《水资源保护》
CAS
2011年第4期38-41,共4页
Water Resources Protection
