A model test for high-level radioactive nuclear waste repository is carried out. An axisymmetric model for nuclear waste repository of bentonite and rock in the near-field of the nuclear waste repository is established. Considering the thermo-hydro-mechanical (THM) coupled process, temperature field, seepage field and stress field in the near-field after closure of nuclear waste repository, numerical simulation of fully coupled THM is done by using the finite element method (FEM) software Code-Bright with a proper choice of THM constitutive equation. By comparison of different initial heat sources, temperatures of bentonite and rock, liquid saturation, suction and variation of stress in the near field after closure of repository are obtained. The results show that the lower the quantity of initial heat, the better the properties of bentonite and rock.
QIN Ai-fang, WANG Hai-tang, ZHAO Xiao-long
. Influence of Heat Source on Near Field Behavior of Nuclear Waste Repository[J]. Journal of Shanghai University, 2013
, 19(5)
: 520
-526
.
DOI: 10.3969/j.issn.1007-2861.2013.05.015
[1] Rutquvist J, Borgesson L, Chijimatsu M, et al. Thermohydro-mechanics of partially saturated geological media: governing equations and formulation of four finite element methods [J]. International Journal of Rock Mechanics and Mining Sciences, 2001, 38(1): 105-127.
[2] Guvanasen V, Chan T. A new three-dimensional finite element analysis of hysteresis thermohydrome chanical deformation of fractured rock mass with dilatance in fractures [C]// Proceedings of the Second Conference on Mechanics of Jointed and Faulted Rocks. 1995: 10-14; 347-442.
[3] Stephansson O, Jing L, Tsang C F. Coupled thermo-hydro-mechanical processes of fractured media [M]. Amsterdam: Elsevier, 1996: 545-549.
[4] Mata C, Guimaraes L D N, Ledesma A, et al. A hydro-geochemical analysis of the saturation process with salt water of a bentonite crushed granite rock mixture in an engineered nuclear barrier [J]. Engineering Geology, 2005, 81(3): 227-245.
[5] Millard A, Rejeb A, Chijimatsu M, et al. Numerical study of the THM effects on the near-field safety of a hypothetical nuclear waste repository-BMT1 of the DECOVALEX Ⅲ project. Part 2: effects of THM coupling in continuous and homogeneous rocks [J]. International Journal of Rock Mechanics and Mining Sciences, 2005, 42: 731-744.
[6] Rutqvist J, Chijimatsu M, Jing L, et al. Numerical study of THM effects on the near-field safety of a hypothetical nuclear waste repository-BMT1 of the DECOVALEX Ⅲ project. Part 3: effects of THM coupling in sparsely fractured rocks [J]. International Journal of Rock Mechanics and Mining Sciences, 2005, 42: 745-755.
[7] Abel C J, Mar´?a V V, Roberto G E. Adaptation of the van Genuchten expression to the effects of temperature and density for compacted bentonites [J]. Applied Clay Science, 2009, 42: 575-582.
[8] Blum P, Mackay R, Riley M S, et al. Performance assessment of a nuclear waste repository: upscaling coupled hydro-mechanical properties for far-field transport analysis [J]. International Journal of Rock Mechanics and Mining Sciences, 2005, 42(5/6): 781-792.
[9] 徐永福, 孙德安, 董平. 膨润土及其与砂混合物的膨胀试验[J]. 岩石力学与工程学报, 2003, 22(3): 451-455.
[10] 孙德安, 闫威, 孙文静. 非饱和膨润土掺砂混合物的水力和力学性质[J]. 上海大学学报: 自然科学版, 2010,16(2): 196-202.
[11] 牛文杰, 陈宝, 叶为民, 等. 非饱和高压实膨润土水化的数值模拟[J]. 地下空间与工程学报, 2009, 5(3): 515-519.
[12] 张玉军. 热-水-力耦合模型及FEBEX 原位试验二维有限元分析[J]. 岩土工程学报, 2007, 29(3): 313-378.
[13] 刘月妙, 王驹, 蔡美峰, 等. 热-力耦合条件下高放废物处置库间距研究[J]. 铀矿地质, 2009, 25(6): 373-378.
[14] 秦爱芳, 赵飞, 赵小龙. 缓冲材料参数对核废料处置库近场影响的二维有限元分析[J]. 上海大学学报: 自然科学版, 2012, 18(5): 539-544.
[15] Olivella S, Gens A, Carrera J. Numerical formulation for a simulator (Code-Bright) for the coupled analysis of saline media [J]. Engineering Computations, 1996, 13: 87-112.
[16] Eduardo E A. Gas migration through barriers [C]// International Symposium on Engineered Barriers for High Level Radioactive Waste Disposal. 2005: 3-26.
[17] Gens A, Garcia-Molina J, Olivella S. Analysis of a full scale in situ test simulating repository conditions [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1998, 22: 515-548.
