曹妃甸甸头深槽海底滑坡及稳定性研究

The greatest advantage of Caofeidian Harbor lies in the deep channel facing the Bohai Bay. The channel is a natural port hub for Caofeidian Habor. The construction of Caofeidian Habor had impacted the hydrodynamic environment and the sediment movement. It reflects from the effects of reclamation project in recent years that the maximum depth in the south of Caofeidian Head is 42m,and the channel slope is steep of 10%~17%. Local area of the deep channel is in scour state,partly deepens 0.4m accompanied by slump and mud flow. 25 DWT dock happens to be in the Caofeidian Head close to the channel. Therefore the channel slope becomes the key focus area. This area located nearby Nanpu depression-Caofeidian fracture,which is a quaternary active fault. It easily occurred landsliding in extreme events such as storm surge and earthquake. It will endanger Caofeidian port security. This project intends to adopt field investigation and test,sample analysis,mathematical simulation and comprehensive analysis methods to study the Caofeidian channel landslide's distribution and geomorphological features. GEO-SLOPE landslide analysis software will be used to calculate the slope reliability and to numerically simulate its stability under big wind waves and seismic forces. Finally it will draw a conclusion of the slope failure mechanism and evolution tendency. This project has great significance to the planning,operation and maintenance of Caofeidian Habor for future development.

"面向大海有深槽"是曹妃甸港最大的优势，深槽是进出曹妃甸港的天然深水航道。曹妃甸港等重大工程的建设对海域水动力环境及水沙运动特性造成一定影响，近3年填海工程效应初步表明，曹妃甸甸头南侧最大水深42m，深槽边坡坡度较陡，坡度约10%～17%，深槽海域局部处于冲刷状态，局部加深0.4m，有海底滑塌和泥流发生。25万吨级矿石码头主体即位于曹妃甸甸头，紧贴深槽，栈桥位于深槽边坡上，是重点关注区，该处地质构造复杂，位于南堡凹陷曹妃甸断裂附近，且为第四纪活动断裂，在风暴潮和地震等极端事件下易发生海底滑坡，危及曹妃甸港安全。本项目拟采用野外调查和实测、样品分析、数学模拟、综合分析等手段，研究曹妃甸深槽的海底滑坡分布范围、地貌特征，采用GEO-SLOPE滑坡分析软件进行斜坡可靠度计算、模拟大风浪和地震力作用下斜坡稳定数值分析，研究斜坡破坏机理及演变趋势。对曹妃甸港的规划、运营期维护和未来发展具有重要意义。

摘要:主要研究内容为收集曹妃甸海区已有历史资料，并在曹妃甸甸头深槽海区补充了一部分调查研究工作。利用获得的多期水深地形资料和侧扫声纳资料研究了曹妃甸深槽区海底地形地貌特征，对取得的高分辨率和高信噪比的浅层地震剖面、单道地震剖面和多道地震剖面进行了精细解释工作，主要对曹妃甸甸头前沿深槽浅部地层结构和分布特征进行了研究，取得了一些新的认识。“面向大海有深槽”是曹妃甸港最大的优势，曹妃甸港等重大工程的建设对海域水动力环境及水沙运动特性造成一定影响，曹妃甸港建成后深槽的地形地貌演变、边坡的稳定性、海底滑坡破坏后演变趋势等是关注的重点，本项目的研究成果对曹妃甸港的规划、运营期维护和未来发展具有重要意义。一方面为部署渤海湾海岸带项目下年度工作提供了导向，另一方面也为工程后期海洋环境的跟踪评价提供了基准资料，该项目成果可推广应用于我国海岸带其它海区。