透水四面体截流材料的稳定性试验研究

Stability test study on permeable tetrahedron river closure material

实体四面体结构的人工预制抛投材料在截流工程中广泛应用于代替大质量的天然块石,具有透水性的四面体结构则在江河堤岸的防冲促淤中广泛使用,且效果甚佳。文中通过物理模型试验,结合透水四面体结构的特点和截流工程理论,研究了材料在水中的稳定特性,与实体四面体结构进行了对比。探讨了透水四面体在截流工程中的应用可能性。研究结果表明:透水四面体的表面开孔率对落水后的稳定性有较大的影响;开孔率为32.15%时稳定性最优,且止动流速与实体四面体基本相当;流场特性优于实体四面体,有效减轻了漩涡造成的不利影响。适当提高人工预制截流材料的透水性,提升稳定性的新途径是可借鉴的。

The artificial prefabrication casting material with the solid tetrahedral structure are widely used in the river closure works to replace the massive natural stone, and with the permeable tetrahedron structure are widely used in the river embankment to prevent scour and promote silting-up, which has the good effect. Through the physical model test and based on the structure characteristics of the permeable tetrahedron and the theory of river closure engineering, the paper researches the stability of the material in water, compares with solid tetrahedral structure and discusses the application possibility of the permeable tetrahedron in river closure works. The results show that the surface holes area ratio of the permeable tetrahedron has the great influence on the stability after entering the water, the best stability is obtained when the holes area ratio is 32.15%, meanwhile, the stop velocity is basically equivalent to the solid tetrahedron, the flow characteristics of the permeable tetrahedron is better than the solid tetrahedron, which could reduce effectively the adverse effects caused by the whirlpool. Appropriately increasing the permeability of the artificial prefabrication river closure material could improve the stability, that is to say, the new approach could be used for reference.