第四系钙质胶结卵石成因及工程特性探讨

Study on the Genesis of Quaternary Calcareous Cemented Pebble and Its Engineering Characteristics

南水北调中线工程河南黄河北渠段沿线第四系松散层中分布有钙质胶结卵石。根据钻孔岩芯和开挖揭示情况,查清胶结卵石的分布特征,分析其成因主要为钙质淋漓、析出、胶结的结果。通过取样做饱和单轴抗压试验判别其软硬状态,结合施工开挖难易程度,综合考虑将其胶结程度分为三级,对其工程特性进行探讨。

Calcite cemented pebbles in quaternary unconsolidated layer distribute along the north canal section of Yellow River, south-to-north water transfer project in Henan. Based on the drilling cores and excavation, the distribution characteristics of cemented pebbles was found and analyzed, further we made it clear that the main causes resulting in cemented pebbles is calcium dripping wet, precipitation, and cementing. We divided its degree of consolidation into three level, by saturated uniaxial compressive test to judge whether it is hard or soft, and combined with the complexity of construction excavation. Finally, its engineering properties are discussed in this paper.