摘要
高放废物的安全处置是科学、技术和工程界所面临的挑战性问题。基于高放废物处置库概念模型,应用3DEC程序计算分析废物罐数量对处置库近场温度、应力和位移的影响。结果表明:(1)每增加1个废物罐,岩体平均温度升高约26.5℃,平均温度梯度增大约0.22℃/m,内侧比外侧观察点平均温度高约1.25℃,并且岩体平均位移增大约0.193 cm,内侧观察点温度、位移和应力差值随时间小于其外侧;(2)废物罐释热约0~0.6a时,膨润土的温度、竖向位移和竖向应力增幅较大,其后膨润土温度和竖向位移增幅减小,由初始施加的地应力变为温度产生的2~2.8 MPa的热拉应力,膨润土竖向应力随时间基本保持不变或略有减小;(3)工程设计中增加的废物罐数量产生的热叠加效应不容忽视,建议单个钻孔内处置1个废物罐为宜。
Safe disposal of high-level radioactive waste is a challenging problem faced by the scientific,technical and engineering communities.Based on the conceptual model of high-level radioactive waste repository,3DEC program was applied to calculate and analyze the influence of the number of waste tanks on the near-field temperature,stress and displacement of the repository.The results show that:(1)For each additional waste tank,the average temperature of the rock mass increases by about 26.5℃,the average temperature gradient increases by about 0.22℃/m,the average temperature of the inner side is about 1.25℃higher than that of the outer observation point,and the average displacement of the rock mass increases by about 0.193 cm;The difference of temperature,displacement and stress of the inner observation point is smaller than that of the outer side with time.(2)When the waste tank heat release in 0~0.6 years,and the bentonite temperature,vertical displacement and vertical stress on the surface of the waste tank increases greatly,which changes from the initial applied in-situ stress to the thermal tensile stress of 2~3 MPa generated by the temperature,then the vertical stress of the bentonite on the surface of the waste tank basically remains unchanged or slightly decreases with time,and then the increase of the bentonite temperature and vertical displacement on the surface of the waste tank decreases.(3)The thermal superposition effect of waste tanks added in the project can not be ignored,It is recommended to dispose of 1 waste tanks in a single borehole.
作者
高俊义
GAO Junyi(School of Architecture and Civil Engineering,Yan’an University,Yan’an of Shaanxi Prov.716000,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2020年第4期710-717,共8页
Nuclear Science and Engineering
基金
延安大学博士科研启动项目(YDBK2018-08)。
关键词
高放废物处置库
废物罐数量
近场温度—应力—位移
数值分析
High-level Radioactive Waste Repository
Quantity of Waste Tanks
Near-field Temperature-stress-displacement
Numerical Analysis
