摘要
通过在钻孔中投放放射性同位素,对地下水渗流场进行标记,然后探测其浓度变化,利用同位素单孔稀释法得到钻孔中地下水的渗透流速,确定地层中的强渗漏带。利用温度示踪方法可以判别是否存在库水渗漏,其依据是库水与坝后地层温度分布规律不同,库水底部为低温,而地层温度随深度增加而上升,从而使当地地下水也具有随深度增加的趋势。若钻孔附近存在低温库水渗漏,则在钻孔温度分布曲线会出现拐点或低温谷。将此异常点作为孔中库水和当地地下水的分界点,根据所探测的渗流速度就可以分别计算出两部分的渗漏量。以某土石坝为例,利用同位素综合示踪方法进行了绕坝渗漏的判别和计算,为采取防渗加固措施提供依据。
Radioactive isotope is put into borehole and its conc entration is detected,and then based on isotope dilution method,the groundwater seepage velocity is calculated and the strong leakage area is determined in stratum.The temperature of reservoir water and stratum is different.Normally,the water temperature in the bottom of reservoir is low,while the temperature of stratum is increasing,which cause the temperature of local groundwater also to increas with depth.The leakage of reservoir water will cause inflexion points on the temperature distribution curve in borehole.These abnormal points are regarded as the dividing points of reservoir water and local groundwater.The leakage volume in both parts will be calculated with above seepage velocities.Taking Bikou reservoir as an example,the by-pass dam leakage is determined and calculated.Related results can be used for taking strengthening measure.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2009年第S1期174-177,共4页
Journal of Liaoning Technical University (Natural Science)
基金
河海大学水文水资源国家重点实验室开放研究基金资助项目(2005406611)
国家自然科学基金资助项目(50809024)
河海大学自然科学基金资助项目资助项目(2007417511)
关键词
同位素示踪
温度
水库
渗透流速
渗漏量
isotope tracer
temperature
reservoir
seepage velocity
leakage volume
