A DUAL CONTINUUM FLOW AND REACTIVE TRANSPORT MODEL FOR A LONG-TERM PERMEABILITY TEST OF FEBEX BENTONITE

摘要：

Experimental evidence indicates that bentonite exhibits two types of porous domains. Geochemical non-equilibrium between macro-and micro-domains calls for a fully coupled reactive transport Dual Continuum Model (DCM) to describe water flow, solute transport and hydrochemical reactions in bentonites. Here we present a formulation of dual continuum flow and reactive transport with an nth-order solute transfer term. Such formulation has been implemented in a finite element code which solves for both forward and inverse problems. A reactive transport DCM of a long-term permeability test of the FEBEX project is presented. DCM results fit measured data much better than a Single Continuum Model (SCM), thus indicating that dual continuum behaviour is relevant for reactive transport in bentonite. Model results indicate also that solute transfer across micro and macro domains is responsible for the long tails of breakthrough curves of chloride and other chemical species.

作者: Liange Zheng Javier Samper

作者单位: Escuela de Caminos, Universidade da Coruna, Campus Elvina, 15192 Coruna, Spain

会议类型: 国际会议

会议名称: 第二届国际应力-水流-热-化学耦合学术大会(2nd International Conference on Coupled Thermo-Hydro-Mechanical Processes in Geosystems and Engineering：Geoproc2006)

会议地点: 南京

会议语种:英文

页码: 288-293

在线出版日期: 2006-05-22（万方平台首次上网日期，不代表论文的发表时间）