摘要
通过对甘肃北山旧井地段构造地质、水文地质、地球物理和钻孔资料等的分析研究,并应用相应的软件对其进行三维地质建模;在三维地质建模基础上,应用RockFlow对三维断裂恒定流场,二维基质扩散、吸附和核素衰变,以及在基质和断裂不同介质中的地下流体和核素的运移进行模拟计算,同时模拟地下流体和核素运移的时空分布。研究结果表明:三维地质建模是一种非常有效的场址评价手段,可以很直观地显示断裂和主岩的空间分布;裂隙是核素运移的主要通道,核素在基质中的运移主要受基质的孔隙度、渗透率和扩散系数影响,其数值越大,核素运移速度越大,基质吸附对核素运移起到一定的阻滞作用,而核素衰变系数对核素运移的影响不大;三维地质建模和RockFlow不但可对地下流体和核素的运移过程进行模拟和计算,而且其结果可为地下实验室或处置库的工程设计及安全评价提供必要的数据和资料。
Through analyzing the geological structure,hydrogeology,geophysics and borehole data in Jiujing block,a simple 3D geological model was constructed by using the correspondence software for Jiujing block, Beishan area,Gansu Province. On the basis of the 3D faults stable fluid field,the 2D matrix diffusion and sorption,the nuclides decay were calculated and simulated by using RockFlow. Simultaneously,the underground fluid and nuclides migration in the matrix and fault were simulated,and the temporal and spatial distributions of underground fluid and nuclides were also studied. The result shows that the 3D geological model is a very useful site assessment method,from which the spatial distribution of the host rock and faults can be displayed directly. Secondly,the key migration channel of nuclides is fracture;and the nuclides migration speed is affected by the porosity,permeability and diffusion coefficient of the matrix. The larger of these parameters are,the faster of the nuclides migration speed is. The nuclides migration is retarded by the matrix sorption,but the decaying coefficient has a limited influence on the nuclides migration. Thirdly,combining with 3D geological model and RockFlow, the fluid and nuclides migration are simulated;and the modeling results can provide references to the engineering design and safety assessment.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第S2期3989-3994,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国防科工委"核设施退役和三废治理"项目
