【摘要】 由于风化作用,近地表的坚硬泥质岩和页岩的渗透性系数(k)一般为10-5～10-6m/s。按德国现行的技术规范要求,这种场地不适合作为填埋场。但由于这类岩层在地下深处渗透性很小,并且具有很高的膨胀性,所以这种场地可以通过矿物密封材料改性后而达到地质技术屏障的要求。这种土层和坚硬岩层与那些渗透性小,与厚度较薄的粘土层相比应该是完好的地质屏障。在旧的垃圾填埋场区内应该对新的填埋场的地质屏障降低要求,而且当人口增长时,填埋场选址要尽可能的对地质屏障的质量改良,这很可能被环境法规所接受。更多还原

【Abstract】 Claycontaining rocks and over consolidated c1ays are affected by stress release near the surface, often they are weathered and usually a disintegrated zone of moderate permeability of 10-5-10-6m/s is deve1oped.Therefore according to German regulations such sites are not suitable for waste deposits.But, because of the very low permeability of these formation at greater depths, their mostly great extent and thickness an improvement of such sites is recommended e.g. by a mineral sealing. Such kinds of rock and soil yield in general a better geological barrier than sites with a low permeable, but relatively thin clay layer overlying permeable subgrade. In contaminated areas the requirements on the geological barrier of waste deposits should be reduced. Due to increased possibilities for site se1ectlon the acceptance of the actual environmental regulations by the population may rise.更多还原