岩体裂隙网络矿物溶解-沉淀-迁移数值模拟

Numerical simulation of mineral dissolution-precipitation-transportation in a fracture network of rock-mass

摘要: 为了研究岩体裂隙网络中矿物溶解-沉淀的变化规律及其对溶质运移的影响,联合矿物溶解-沉淀动力学模型、渗流模型和溶质运移模型建立了岩体裂隙网络矿物溶解-沉淀-迁移模型,经过水溶液络合物计算和矿物成分分析,对研究区域方解石溶解-沉淀作用及溶质运移进行了数值模拟。得出的结论主要有:(1)受裂隙网络分布的影响,溶质运移分布极不均匀,溶质主要通过连通的裂隙从上游向下游迁移;(2)考虑方解石的溶解-沉淀作用之后,在溶解区域溶质浓度增加,在沉淀区域溶质浓度减少;(3)通过对比分析,可知方解石溶解-沉淀受水溶液中CO23-浓度影响较大。

Abstract: In combination with kinetic models of mineral dissolution-precipitation,numerical simulation of calcite dissolution-precipitation and solute transport in an investigative zone is accomplished in this paper in order to study the variation law of mineral dissolution-precipitation and the effect of solute transport.The main conclusions are drawn as follows:(1) Distribution of solute transport is discontinuous because of the effect of fracture network distribution and the solute transportation is ma...