АНАЛИЗ ДОЛГОВЕЧНОСТИ ИНЖЕНЕРНЫХ БАРЬЕРОВ БЕЗОПАСНОСТИ ИЗ БЕТОННЫХ ГЛИН

Abstract

The durability and safety of the storage and burial sites of hazardous waste from metallurgical and chemical production should be ensured through the consistent implementation of the defense in depth concept. Engineering designs of safety barriers should meet the following requirements: limit contact of waste with natural waters; ensure the safety of waste under external influences; prevent the spread of hazardous industrial waste to the surrounding soil mass. Object safety indicators are durability and service life, which should be ta ken into account in scenarios of forecasting the durability of disposal systems.For an objective assessment of the degradation of engineering safety barrier s of radioactive waste disposal sites, evolution models of bentonite barriers are considered. The following models are considered: montmorillonite illitization model; bentonite chlorination model; model for calculating the swelling parameters; ion exchange model and a model of sorption of radionuclides by bentonite. Conclusions show that when assessing the long-term evolution of engineering safety barriers from bentonite during the chemical destruction of montmorillonite, changes can occur, in particular, an increase in the permeability of the barrier.