现代黄河三角洲钓口叶瓣不良地质现象

ADVERSE GEOLOGICAL PHENOMENA IN DIAOKOU LOBE OF THE MODERN YELLOW RIVER DELTA

根据对钓口三角洲叶瓣体的钻孔、浅地层剖面调查资料,研究了钓口叶瓣体垂向地层结构特点,分析了因其所导致的潜在不良地质现象,如:地面沉降以及不均匀沉降、土体液化、软弱层及底辟、滑坡、差异冲刷,总结了其特征、成因模式及危害。因钓口叶瓣的地层结构特点与现代黄河三角洲整体地层结构特点相似,其所导致的不良地质现象也普遍存在于现代黄河三角洲。该区为埕岛油田所在地,在该区进行工程建设,应对这些可能存在的不良地质现象引起重视。

This paper analyzes the adverse geological phenomena in the Diaokou lobe of the Yellow River Delta for their formation history and stratigraphic sequence,based on the data from boreholes,sub-bottom profiles and previous researches.The adverse geological phenomena observed include land subsidence and uneven settlement,soil liquefaction,weak strata and diapirs,landslides,and differential erosion.Discussed are the formation mechanisms,features and risk of these adverse geological phenomena.These phenomena observed in the Diaokou lobe also occur in the present Yellow River delta since they are similar in stratigraphic sequences.The Chengdao Oilfield is located on the Diaokou lobe.High attention should be paid to these phenomena in geotechnical engineering work to avoid geological disasters.