黄河下游近代河床下伏地层的成因及其工程地质性质研究

通过地层分析和室内土工试验等方法,研究了黄河下游河南台前至山东位山河段近代河床下伏的三层地层的成因,研究结果表明:上部黄色砂壤土层系1855a黄河铜瓦厢发生大改道后黄河新近冲洪积沉积物;中部黑色粘土层为湖积沉积物;下部黄色壤土层系古黄河冲洪积沉积物。在此基础上还对黄河近代河床下伏的三层地层的工程地质性质进行了研究,给出了各个地层的干密度、比重、抗剪强度等物理力学性质指标。

GENESIS AND ENGINEERING GEOLOGICAL PROPERTIES OF THE RECENT STRATA UNDERLYING THE RIVER BED IN THE LOWER YELLOW RIVER REACHES

This paper studied the formation of recent three strata underlying the river bed in the reaches from Taiqian of Henan to Weishan of Shandong according to the stratigraphic analysis and soil tests. The result showed that the upper yellow sandy clay loam is the alluvial deposit by flood, which had occurred at Tongwaxiang where the river channel changed in 1885, the middle black clay is the lake sedimentary formation, and the lower yellow loam is the alluvial deposit of the ancient yellow river. More-over, the engineering geological properties of the strata were also described, including dry density, specific gravity, shearing strength, etc.