Composition and mechanical characteristic of riverbed soil in lower Yellow River

Yellow River is a typical wandering channel with large sediment content. Lack of systemic data about composition of riverbed and indexes of mechanical characteristic, the influence of composition and indexes of mechanical characteristic of riverbed was considered difficultly in physical and mathematical models. Mechanical characteristic of soil considered, identification standard of soil layer about riverbed was carried out based on strength resistance of cone tip and the ratio of friction resistance between lateral cone and cone tip, and comparative analysis is worked out with identification standard of indoor geotechnical test. Taking the typical wandering section of river from Baihe to Yiluo outfall as the example, cone penetration tests were carried out and indoor tests were worked out. Firstly, huge data about composition and mechanical characteristic of riverbed are achieved, it shows that the main components of riverbed in lower Yellow River are silty clay, silty loam, sandy loam, sand and so on. Secondly, physical and mechanical indexes of riverbed soil keep strong regularity. Finally, formation cause and change trend are achieved through the basic data of riverbed soil, thus it will improve the development of technology of (Line No. 1) physical model and numerical method for river research (Line No. 2).