水力插板透水丁坝缓流促淤效果试验研究

Experimental Study on Effect of Sedimentation Promotion with Tranquil Flow of Hydraulic Flashboard Permeable Spur Dike

针对新疆粉细沙河床上堤坝工程防洪效果不佳的问题,通过在室内开展河工动床模型试验,并结合理论分析的方法对水力插板透水丁坝、水力插板实体丁坝、井柱桩透水丁坝的缓流促淤效果进行对比试验研究。结果表明:三种型式丁坝的坝后流速均出现了不同程度的降低,其中水力插板透水丁坝坝后流速降低了约46%,水力插板实体丁坝及井柱桩透水丁坝坝后流速分别降低了约16%和30%;水力插板透水丁坝坝后未出现明显的回流区,使其坝后淤积高度大于另外两种型式丁坝;水力插板透水丁坝比水力插板实体丁坝与井柱桩透水丁坝在维持自身稳定性上的效果更好。

In view of flood control effect was not obvious in Xinjiang riverbed made of sand, by developing river engineering movable bed model test and theoretical analysis, for effect of sedimentation promotion with tranquil flow of hydraulic flashboard permeable spur dike and hydraulic flashboard entity spur dike, well-pole pile permeable spur dike in contrast test research were conducted. The outcomes show that the velocity after dam of three types of spur dike is lower, the velocity behind the hydraulic flashboard permeable spur dike decreases by about 46%, the velocity at hydraulic flashboard entity spur dike and well-pole pile permeable spur dike decreases by about 16% and 30% respectively; there is no obvious recirculation region after dam, the height of deposition after dam of hydraulic flashboard permeable spur dike is greater than the other two spur dikes; hydraulic flashboard permeable spur dike is better than hydraulic flashboard entity spur dike and well-pole pile permeable spur dike on maintaining its own stability.