The large-scale embankment reduced the flood threat to the capital city,but also brought a series of changes to the geographical env.
历史上永定河的大规模筑堤为京城减少了洪水之虞,但同时也带来了包括北京水环境在内的一系列地理环境的变化。
Pile-forming is reliable by using impact hammer,adding parabolic fill and building dikes as the protective wall.
采用冲击锥形锤,添加抛填料,筑暗筑堤作为护壁,可以实现再溶洞泥砂中可靠成桩。
