混凝土四面体透水框架群防根石走失技术应用

Application Research of Preventing Root-Stones Loss with Tetrahedron-Like Concrete Penetrating Frame Group

对混凝土四面体透水框架群在黄河下游桃花峪控导的应用情况进行了分析,结果表明:①混凝土四面体透水框架群具有自身稳定性好、适应河床变形能力强、能削弱水流能量、降低流速、促使泥沙迅速落淤等特点,施工工艺简单;②混凝土四面体透水框架群能够有效地减小坝前冲刷坑的深度,减缓水流对坝体的直接冲击;③混凝土四面体透水框架群不易发生走失,可有效减轻抢险负担,节约大量石料;④利用混凝土四面体透水框架群加固工程基础时,建议在防护部位根石坡面和坡脚外河床一定宽度内抛投,以增强根石防护效果。

The tetrahedron-like concrete penetrating frame groups were applied on preventing root-stones loss of flood diversion and regulation works in Taohuayu of the lower Yellow River, and the results show that ： 1 ） The tetrahedron-like concrete penetrating frame groups have their own charac-teristics such as good stability, strong adaptive ability to riverbed deformation, weakening the water flow energy, reducing flow velocity, and prompting the rapid deposition of sediment, and the technology of tetrahedron-like concrete penetrating frame groups is simple ; 2 ） the tetrahedron-like concrete penetrating frame groups can effectively reduce the depth of scour holes in front of dam and slow the direct impact of water flow on the dam body ; 3 ） the tetrahedron-like concrete penetrating frame groups aren＇ t prone to get lost, which can effectively reduce root-stones loss and save lots of stones ; 4 ） the tetrahedron-like concrete penetrating frame groups can be used for the project foundation stabilization, and it is suggested that it will be better for root-stones protection if throwing on the slope of rook-stones and within a certain width of slopetoe outside the riverbed.