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利用地球化学软件Phreeqc模拟了高放核废料处置库的高压实MX80膨润土中发生的水文地球化学反应,基于长时间尺度的研究的需要,忽略热、力、流等因素的影响,主要考虑了K~+、Ca~(2+)、Na~+、Mg~(2+)四种阳离子的离子交换和矿物溶解沉淀反应,建立了膨润土中的一维离子运移反应模型。模拟了不同外界流体作用下,膨润土化学组分在时间和空间上的变化。结合化学组分变化结果,对膨润土膨胀性衰减情况进行了计算和评估。得到1万年后海水和地下水环境下的MX80膨润土膨胀性衰减系数分别达到0.79和0.91。
Using geochemical software Phreeqc to simulate the hydrogeochemical reactions occurring in the high-pressure solid MX80 bentonite of a high-level nuclear waste repository, based on the needs of long-term scale research and ignoring the influence of heat, force and flow, the main consideration Ion exchange and mineral dissolution and precipitation reactions of K ~ +, Ca ~ (2 +), Na ~ + and Mg ~ (2+) ions, and established one-dimensional ion transport reaction model in bentonite. The effects of different external fluids on the chemical composition of bentonite in time and space changes. Combined with the change of chemical composition, the swelling attenuation of bentonite was calculated and evaluated. After 10,000 years, the expansibility attenuation coefficient of MX80 bentonite reached 0.79 and 0.91 in seawater and groundwater respectively.