倒虹吸渗漏原因及泵站运行边界条件初探

Leakage Causes of the Inverted Siphon and the Boundary Condition on Operation of the Pumping Station

南水北调中线干线京石段工程南杏树排水倒虹吸，在三次通水运行期间均发现倒虹吸管身部位伸缩缝、墙体、拉杆孔等处渗水或漏水，通水结束后发现管身所在位置的渠道底部均不同程度的存在渠底塌陷现象。在此期间，泵站集水井内水位变化规律基本一致。通过对强排泵站观测记录和渠道缺陷排查情况综合分析，初步确定渗漏原因，并对泵站运行的边界条件进行探究分析。

During the three times of operation for water delivery, Nanxingshu inverted siphon drainage has water seepage and leakage problems on the tube body part, wall body, drawbar hole, etc. , and some collapse occurred on the channel bottom upon the tube body part. Nanxingshu in- verted siphon drainage, which belongs to the Beijing-Shijiazhuang section of the Middle Route of the South-to-North Water Transfer Project, is managed by Dingzhou Administration. During this period,the change of water level in the pumping sump is stable. This paper has made the com- prehensive analysis on observation records of the pumping station？ for strong drainage and the investigation of channel defects to preliminarily determine the cause of water leakage, and on the boundary conditions of the pump station operation.