Phreatic Dam Experiment at Mazhuang in Lower Reaches of Yellow River and Its Practical Effeets
Ren Ruiwu (Yellow River Engineering Affair Bureau in Xinxiang City,Xin Xiang,Henan Province,453003)
o meet the objective of safety in flood protection,the way mostly uesd to control flood is to build rock and soil structure dams in lower reaches harness of Yellow River. After many years research,the trial phreatic dam at Mazhuang is applide to control flow at lower water level and is overflow in flood seasons.The dam structure is divides into two major parts of sink raft with soft material and scattered rock as dam,the tube-shaped membrane is used to protect flow,and bagged soil is ueds to get weight for heavy press,therefore to meet the demands of anti-float and anti-slippery. The key step in the dam construction is putting the anti-flow membrane rafts and filling in the heavy bagged soil in the deep water.Practice in recent years demonstrate that the effectivenesses of the dam body in anti-flow as well as in controlling flow and of the sink raft in river bottom protection meet fully the design,and there is no need for rush repair over and over again to keep base stable. Phreatic dam needs only invest once and gets long term effect,and its dynamic investment effect is better than earth and stone dam.
【CateGory Index】： TV641