广东珠江口高栏岛登陆海底管道路由区工程环境特征及评价

Engineering Environment Characteristics and Evaluation of the Submarine Pipeline Routing Area Landing on Gaolan Island in the Pearl River Estuary, Guangdong

基于珠江高栏岛海底管道路由调查勘测中水文调查、腐蚀调查、水深地形测量、旁侧声呐探测、浅地层探测、沉积物取样分析等多种勘测技术所获取的资料,分析和研究了路由区区域地质背景、工程水文条件、腐蚀条件和地质条件。结果表明:路由区整体水文条件、腐蚀条件和工程地质条件适宜海底电缆的铺设;路由区主要问题是拐点(TP)至登陆点存在水下岸坡、抛石区、基岩出露海床区和疑似航标痕迹等微地貌。路由设计时应减少水下岸坡穿越距离,避开抛石区、基岩出露海床区和疑似航标,施工时针对水下岸坡采取合理方式进行铺设,作业船应注意避让抛石区、基岩出露海床区和疑似航标以及渔业活动影响。

Based on the data obtained from various survey technologies such as hydrological survey,corrosion survey,bathymetric topographic survey,side sonar detection,shallow stratum detection and sediment sampling analysis in the investigation and survey of submarine pipeline route in Gaolan island of the Pearl River,the regional geological background,the engineering hydrological conditions,corrosion conditions and geological conditions in the route area are analyzed and studied.The results show that the overall hydrological conditions,corrosion conditions and engineering geological conditions of the routing area are suitable for the laying of submarine cables;the main problem in the route area is that there are micro landforms such as underwater bank slope,riprap area,bedrock exposed seabed area and suspected navigation mark traces from the inflection point(TP)to the landing point.During route design,the crossing distance of underwater bank slope shall be reduced,and the riprap area,bedrock exposed seabed area and suspected navigation aids should be avoided.During construction,the underwater bank slope shall be laid in a reasonable way.The operation ship shall pay attention to avoid the impact of riprap area,bedrock exposed seabed area,suspected navigation aids and fishery activities.