重金属污染对岩石风化性能影响的研究  

Study on effects of heavy metal pollution on weathering performance of contaminated rock

作　　者：程峰[1,2] 王星华[1] 莫时雄[2] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《有色金属（矿山部分）》2014年第2期58-62,共5页NONFERROUS METALS(Mining Section）

基　　金：国家高技术研究发展计划(863计划)项目(2007AA11Z134);湖南省科技厅重点支持项目(04SK2008)

摘　　要：通过室外观测试验、室内模拟干湿循环试验、四面临空风化剥落试验,对重金属污染岩石的风化性能进行研究,并根据试验结果绘制重金属质量比与岩石风化的关系拟合曲线。室外观测试验结果表明,污染水侵入量越大,岩体构造越破碎,岩类越软,则风化作用越剧烈;室内模拟干湿循环试验结果表明,岩石受重金属污染暴露面积越大,其受各种风化应力的破坏及影响越大,风化速度越快;四面临空风化剥落试验结果表明,重金属污染物侵入破坏了岩体结构,加剧了岩石的裂隙化程度,改变了岩石的矿物组成和化学成分,物理力学性质和水理性质也发生改变,岩石强度及整体稳定性大为降低;拟合结果表明,重金属污染岩石风化剥落厚度与重金属质量比关系呈多项式型相关关系,其曲线呈抛物线型,为较显著相关。重金属污染岩石风化试验与相关关系研究结果对指导岩质边坡的设计、施工、治理以及维护均具有现实的重要意义。The heavy metal contaminated rock is studied by outdoor observation test, indoor simulation dry-wet cycling test and all side open-air weathering peeling test. The fitting curve of relationship between heavy metal mass ratio and rock weathering are drawn according to the results of test. The results of outdoor observation show that the greater contaminated water intrudes, the more rock mass structure is broken and the more the rocks is soft, the more weathering is intense. The results of indoor dry-wet cycle simulation tests show that the larger rocks exposed area is polluted by heavy metals, the greater it is influenced by all kinds of stress damage and weathering, and the weathering velocity is faster. The results of all around open-air weathering and flaking showed that the rock mass structure is damaged by heavy metal-pollution. The level crack of rock is generated and intensified. The original rock mineral composition and chemical composition is changed. The physical and mechanical properties and water properties of contaminated rock are also changed. The rock strength and overall stability is reduced. The fitting results show that the relationship between weathering type flaking thiekness and quality of heavy metal for heavy metal pollution of rock is a polynomial model. The curve is parabolic and has more significant correlation. The results of weathering test and correlation research for heavy metal pollution of rock has realistic significance in guiding the design, construction, management and maintenance of rock slope.

关 键 词：重金属污染岩石 质量比 风化试验 相关关系 

分 类 号：TU441[建筑科学—岩土工程]