Although 100 more relief wells had constructed at landside toe of the embankment but never attained the presupposed effect due to silting year by year.

• 文中通过大堤原观资料分析，论证了其现状和减压井逐年淤堵趋势；由室内和现场洗井试验，探求了一种恢复减压井效用的方法。