Research On Marine Engineering Geology Characteristic And Feasibility Of Pile Foundation At The Nanpu-caofeidian Sea Area

The Bohai bay is one of the areas where the exploitation of petroleum and natural gas was most early. And the Nanpu—Caofeidian area in the Bohai bay north shallow sea area is the important region of shallow sea oil field, with special ocean environment,active dynamic factor and complex geological conditions.The article summarizes the orderliness of weather,ocean hydroaraphy,ocean ice,geologic and physiognomy, dividing the research area into different engineering geological regions, and discusses the stability of two different pile foundation of inserting pile platform(with large pile shoes and without pile shoes), evaluating the feasibility of different engineering geological regions in the the Nanpu—Caofeidian sea area.According to the study of engineering geological conditions and the feasibility of pile foundation, it divides the Nanpu—Caofeidian sea area into three regions. For the platform with large pile shoes, I which lies in Nanbu sea area andⅡwhich lies in Caofeidian central area is good feasibility region,Ⅲwhich lies in east of Caofeidian area is the region with great diversity; for the platform without pile shoes,ⅡandⅢarea is good feasibility region, I area is the region with great diversity.The obvious deep powder sand in the sea surface is good engineering geological stratum, it is feasible for the pile foundation to choose this stratum, it is also feasible for the pile foundation to Pleistocene silt soil,sand silt soil stratum which has higher intensity as bearing stratum. And the position and depth of Pleistocene silt soil,sand silt soil stratum is the main factor which infect the stability of pile foundation. Moreover, the different acreage of pile section and pile shoes is another influence factor.