摘要
基于工程实际,采用非饱和渗流分析方法,探讨了强透水地基上土石坝下游排渗系统对渗流场的影响。结果表明:集水廊道和辐射井能有效降低浸润线,排渗效果好,但地基渗透坡降增大;单独修建集水廊道可减小下游浸没面积,但无法完全预防浸没现象,辐射井和集水廊道联合作用能有效收集水库渗水,下游地面不会出现浸没现象;坝基是主要的渗漏通道,集水廊道和辐射井的修建并没有使坝体渗漏情况有显著变化;辐射井在收集渗水的同时需要合理控制井内水深,防止辐射井将下游原有地下水排走,造成地下水向上游倒流;采用非饱和渗流模型同时反映了饱和区与非饱和区渗流情况,较为符合工程的实际情况。
The change of seepage field was investigated under the conditions of drainage system in the downstream of earth-rock fill dam with high pervious foundation based on the actual project condition. The analytic method of saturated-unsaturated seepage was used to study the distributed character of seepage field. The results show that the joint action of collection gallery and radiation well can reduce effectively the phreatic line in the dam and be easily to drain seeping water. However, it causes the increase of hydraulic slope of foundation. The application of collection gallery de- creases submerge areas in the downstream of dam, but it cannot forecast the range of submerge. Moreover, the joint action of collection gallery and radiation well can collect a large number of water from the leakage of the dam and the region of submerge is not observed in the downstream of dam. The leakage of dam foundation plays an important role in all leakage. There is not a good improvement of seepage control. Furthermore, the results indicate that the depth of water in the radiation well should be reasonably controlled in order to prevent the backflow of groundwater owing to the draining of groundwater. The analysis of seepage is reasonable to actual projects because the seepage field in the saturated region and saturated-un- saturated region can be reflected with the aid of saturated-unsaturated seepage model.
出处
《人民黄河》
CAS
北大核心
2013年第8期120-122,125,共4页
Yellow River
基金
西华大学重点科研基金资助项目(Z1120412)
西华大学省部共建教育部重点实验室研究基金资助项目(SBZDPY-11-10)
关键词
辐射井
集水廊道
土石坝
渗流
radiation well
collection gallery
earth-rock fill dam
seepage
