中文摘要：

水工建筑物排水孔洞中常常析出大量各色固体物质,对水工建筑物的安全稳定运行产生不可忽视的影响。某大型水利工程排水孔洞中析出物是典型的地下水环境变化下的水文地球化学现象,应用PHREEQC定量模拟析出量结果表明：单位长度析出量介于0.0303～0.9124kg/a,大坝析出物问题并不严重;一、二、三、五、七号单元的单位长度析出量小于0.66kg/a;四号、六号单元的单位长度析出量分别为0.8656kg/a和0.9124kg/a,属于相对危险部位,应该重点监测。应用PHREEQC定量模拟水-岩相互作用,揭示析出物的水文地球化学变化过程,可以为大坝安全监测提供科学依据。

英文摘要：

Large numbers of precipitates are often found in the drainage holes of hydraulic construction and they have adverse effect to hydraulic construction＇s security steady operation.Precipitate in drainage holes of a large hydraulic construction is a typical hydrogeochemistry phenomenon when ground water environmental changes.The PHREEQC simulation result indicates that when the amount of precipitate in unit length is situated between 0.030328kg /a and 0.912361kg /a the dam separation phenomenon is not serious.The amounts of unit one,two,three,five and seven are smaller than 0.66kg /a.The amounts of unit four and six are 0.865574kg /a and 0.912361kg /a respectively,where are dangerous spots,so it should be focused on monitoring.Quantitative simulation of water-rock interaction with PHREEQC,revealing the hydrogeochemical change process of precipitate,can provide a scientific basis for dam safety monitoring.