黄河三角洲埕岛海域分区与波致液化研究

黄河三角洲埕岛海域的工程地质环境极其复杂。随着油田深层次开发,系统分析埕岛海域工程地质环境有着重要的意义。本文收集埕岛海域水深地形资料、130个钻孔数据、37个测流点数据、不同水深处5、10、25、50a重现期波浪要素,在分析该区水深地形、沉积物类型与分布、沉积物物理力学性质、海洋水动力条件的基础上,对该区工程地质环境进行了分区,并利用线性波理论,采用有限元方法求解比奥固结方程,对埕岛海域分区波致液化进行了计算评价。计算结果表明各分区主要由于土体性质不同,波致液化情况也不相同,同时结合波浪及潮流等海洋水动力条件对埕岛海域地质灾害的成因进行了探讨。对埕岛海域工程地质环境特征及分区波致液化的系统分析评价,为本区工程勘察和基础设计具指导意义。

STUDY ON ZONING AND LIQUEFACTION INDUCED BY WAVE OF CHENGDAO IN YELLOW RIVER DELTA

The engineering geological environment of Chengdao in Yellow River delta is very complicated. Along with the development of oil field exploitation, it has great significance to analyse the engineering geological environmental characteristics of Chengdao. The data of bathymetry and topography, 130 boreholes, 37 flow measuring spots and wave elements of different water depth and recurrence interval of Chengdao were collected. The engineering geological environmental zoning of Chengdao was done based on analyzing bathymetry and topography, sediment distribution, physical and mechanical properties of submarine soil and marine hydrodynamics. Moreover, liquefaction of Chengdao zoning induced by wave was calculated using linear wave theory and finite element method to solve the Biot consolidation equation. The results show that the liquefaction of each zone is different mostly because of the different soil properties. And the causes of formation of geological hazard is discussed combining with wave and tide. The systematic analysis and evaluation of the engineering geological environmental characteristics and liquefaction induced by wave is helpful for engineering geological survey and foundation design of Chengdao.