摘要
为研究岩溶地区坝址处地下水的基本动态特征,探明区域内可能存在的渗流安全隐患,以岩溶地区坝址环境水与廊道析出物为研究对象,通过现场水质检测,并结合热重分析法试验和X射线衍射法试验分析水溶液及析出物中的化学成分组成。结果表明,水库水和雨水在流动过程中与周围岩体和帷幕发生溶解作用,溶解后的离子组分进入水体;水库水和雨水存在进一步溶解相应矿物的可能,而廊道渗水和下游溶洞水中方解石呈过饱和状态,有沉淀的趋势;廊道析出物的主要成分为CaCO3,与水体饱和指数分析结果相一致;廊道渗水与下游溶洞中的水主要来自于水库水,而降雨入渗的影响相对较小。研究成果可为当前岩溶地区地下坝潜在安全风险排查提供依据。
In order to study the basic dynamic characteristics of groundwater at dam sites in karst areas and explore potential seepage safety risks in the area,taking the environmental water of dam site and the precipitates of corridor in karst area as the research object,through on-site water quality testing,combination of thermogravimetry test and X-ray diffraction test was used to analyze the chemical composition of aqueous solution and precipitates.The results show that the dissolved water and rainwater interact with the surrounding rock mass and curtain during the flow process,and the dissolved ionic components enter the water body.The reservoir water and rainwater have the possibility to further dissolve the corresponding minerals,while the calcite in the corridor water seepage and downstream Karst cave water is supersaturated and tends to precipitate.The main component of precipitates in the corridor is CaCO3,which is consistent with the analysis results of water saturation index.The water in corridor seepage and downstream Karst cave mainly comes from reservoir water,but the influence of rainfall infiltration is relatively small.The research results provide an important basis for the investigation of potential safety risks of underground dams in Karst areas.
作者
张凯
刘成栋
苏正洋
孟颖
ZHANG Kai;LIU Cheng-dong;SU Zheng-yang;MENG Ying(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Dam Safety Management Center of the Ministry of Water Resources,Nanjing 210029,China)
出处
《水电能源科学》
北大核心
2020年第11期54-57,共4页
Water Resources and Power
基金
国家重点研发计划(2016YFC0401603)
国家自然科学基金项目(51679151,51779154)。
关键词
岩溶地区
地下水库
廊道析出物
渗漏
溯源分析
Karst region
underground reservoir
precipitates of corridor
leakage
source analysis
