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

作　　者：孙旭曙[1] 王科峰[2] 柴军瑞[3,4] 张志滨 

机构地区：[1]武汉大学水利水电学院,武汉430072 [2]中国水电顾问集团中南勘测设计研究院,长沙410014 [3]西安理工大学水利水电学院,西安710048 [4]三峡大学水利与环境学院,宜昌443002 [5]骆马湖水利管理局 [6]邳州河道管理局,徐州221300

出　　处：《水文地质工程地质》2011年第6期84-89,95,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50579092);教育部"新世纪优秀人才支持计划"资助项目(N2CET-05-0679);三峡大学科技创新团队资助项目(603402)

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。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 mainly through the connected fracture network from upstream to downstream;（2） Concentration increases in the dissolute zone and decreases in the precipitate zone when considering the calcite dissolution-precipitation;（3） The dissolution-precipitation of calcite is mainly influenced by concentration of CO2-3 ion.

关 键 词：裂隙网络 地球化学模拟 矿物溶解-沉淀 溶质运移 

分 类 号：X54[环境科学与工程—环境工程]