南京地处长江下游,域内河网密布,城区内河主要为秦淮河和金川河,由于地质历史上古气候的变化,秦淮河数次改道,经历多次的堆积和侵蚀作用,在南京城区古河道内沉积了一套古河道沉积相的第四纪覆盖层。了解古河道沉积相的形成及工程地质分层,对进行岩土工程勘察和建筑物的基础选型都具有重要意义。 Nanjing is located in the lower reaches of the Yangtze River. The river network in the area is densely covered. The main inland rivers in the urban area are the Qinhuai River and the Jinchuan River. Due to the change of paleoclimate in the geological history, the Qinhuai River has been re-routed several times and has undergone many depositions and erosions. A Quaternary overburden of ancient channel sedimentary facies. Understanding the formation of ancient river sedimentary facies and engineering geological stratification is of great significance for geotechnical investigation and foundation selection of buildings.