不同耦合情况下核废料处置库中缓冲层吸力与位移变化的分析与比较

在核废料安全处置分析中,非饱和膨润土常被作为缓冲材料,缓冲层膨润土中的吸力和位移变化是影响处置库性状的两个重要的物理参数。吸力直接影响膨润土的渗透性和力学性质;而位移变化则直接影响处置库设计的成败。本文以FEBEX原位试验数据为依据,应用有限元软件CODE-BRIGHT,分析缓冲层膨润土在热-水-力不同耦合形式下吸力和位移的变化规律,通过对不同耦合模式下吸力和位移的对比,分析影响吸力与位移变化的主要因素。结果可使我们进一步了解核废料处置库中缓冲层的性状,也可为核废料处置库设计计算时选用简单而有效的耦合模型提供参考。

ANALYSIS AND COMPARISON OF SUCTION AND DISPLACEMENT OF BUFFER LAYER IN NUCLEAR WASTE DISPOSAL REPOSITORY UNDER DIFFERENT COUPLING FORMS

Based on the experiment data of the in-situ test of FEBEX,the CODE-BRIGHT is used to simulate the near field of nuclear waste repository and to investigates the change rule of suction and displacement in different coupling forms of Thermo-hydro-mechanical. After comparing the suction and displacement in these coupling forms, we can analyze the main factors that are to influence them. The results can show the character of buffer layer of nuclear waste disposal repository and provides a suitable and simple coupling form for the calculation of project.