Abstract: It is found that uplift pressure measured at main dam foundation since 1994 is relatively high in many dam sections, especially at sections No.8, No.9 and No.10. It was not only of high uplift pressure, but also of great seepage quantity, the coefficient of uplift pressure was up to 0.97. The uplift pressure and seepage quantity measured at No.8 and No.10 are abnormal due to the close relationship between reservoir stage and foundation drain hole and result in great pitfalls. Supplementary treatment for main dam body foundation is carrying out at presently. Something has been done which revealed the abnormal to remove the high uplift pressure and great seepage quantity.

摘要： 大山口水电站大坝主坝基础扬压力观测自1994年至今，发现多数坝段扬压力偏大，特别是8#、9#、10#坝段不仅扬压力高，而且渗漏量也很大,扬压力系数最大时达0.97，扬压水位接近坝前水位。8#～10#坝段扬压力和渗漏量皆属异常，其它坝段扬压力多数偏高。8#～10#坝段基础排水孔与水库之间存在密切的水力联系，该段基础存在较大隐患。新疆水电勘测设计院测出渗漏深度分布在坝底浅部基岩，渗流沿建基面渗漏的可能性较大，目前，对主坝基础正进行补强工程处理，并取芯样检查坝底混凝土与基岩情况，弄清异常原因，以消除扬压力高、渗