【作者】 沈珍瑶； 李国鼎； 李书绅；

【Author】 SHEN Zhen-yao~([1,2]) LI Guo-ding~([1]) LI Shu-shen~([2]) (1.Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084; 2.China Institute for Radiation Protection,Taiyuan 030006)

【机构】 清华大学环境科学与工程系； 中国辐射防护研究院；

【摘要】 高放废物地质处置库中固化体与周边介质间热、湿、力相互作用及影响目前深为有关研究人员所密切关注。本文回顾了高放废物处置概况并给出了温度场-水势场-应力场耦合研究的意义,建立了适合饱和与非饱和孔隙介质的热-湿-力耦合方程并给出了其求解方法,根据建立的模型及其求解方法编制了相应的有限元程序,该程序目前可适合平面应变及轴对称问题,并可考虑多种边界条件的任意组合。随后,利用编制的程序对假定的实际处置库近场进行了模拟,给出了其温度场分布图式,以及应力场、水势场随时间的变化趋势。研究结果显示,在此假定的处置条件下,温度场的影响持续时间较长(超过10000年),而水势场的影响持续时间极短(大约1年),应力场的变化由温度场与水势场引起,因而伴随温度场的影响。文中最后提出进一步的研究意见。更多还原

【Abstract】 Long-term safety disposal of High-Level radioactive Waste(HLW) is a very urgent item in peace utilization of the atom energy in the world.The method of deep geological disposal is regarded as a suitable one to disposal HLW.It is very important to do the research of Thermo-Hydro-Mechanical(THM) coupled process associated with HLW disposal repository. The 3-D coupled equations,which are used to descript THM coupled process and suit to saturated-unsaturated porous media,are given out in this paper.The initial condition and two kinds of stress boundary condition,two kinds of hydraulic boundary condition and three kinds of temperature boundary condition are introduced. The finite element method with mid-interval backward difference scheme and the predictor-corrector solute is used to solve these nonlinear full-coupled equations.The finite element code,which is based on above THM coupled equations and its numerical method,is developed by the authors.This code is suit to the plane strain or axis-symmetry problem. Then,the code is used to simulate the THM coupled process in the near field of a certain ideal HLW disposal repository.The data on temperature distribution vs.time,water head vs.time and stress vs.time after the closure of disposal repository are presented. The results show that,in such assumed condition,the impact of temperature is much longer(over 10 000 years) in near field of a certain HLW disposal repository and the impact of water head is much shorter(about 1 year).Since the stress is induced by temperature and water head in this condition,the impact time of stress is just as that of temperature.更多还原