地貌形态对海底管线稳定性影响的研究

The effect of seabed features on the stability of offshore pipeline

以东方1-1平台海底管线路由区为例,多次对该路由区多波束测深、旁扫声纳、浅地层剖面、土质、海流及海底过程的原位监测调查数据和收集的波浪、海流等相关资料进行分析,得出,在水动力条件的作用下,海底会产生沉积物的侵蚀、搬运和沉积等过程,这些过程对海底地貌有重要的改造作用,会对管线稳定性具有重大影响。提出管线铺设需预先了解水下环境的动力条件的规律,识别沿拟定管线路由区可能存在的海床运动和波流冲刷的地质灾害,找到地貌形态对海底管线稳定性影响的原因。进而提出根据不同情况的解决对策,有效地减少地貌形态对海底管线稳定性影响。

In this paper taking the DF1-1 Gas Field submarine pipeline route as an example, based on the multi-beam soundering, side scan sonar and Sub-bottom profile surveys, seabed sediment analysis, current measurement and in-situ monitoring result of seabed process, together with the collected data including wave and current, the scouring, transportation and sedimentation processes of seabed sediment under hydrodynamic conditions along the DF1-1 pipeline route are discussed in this paper. These processes can rebuild seabed geomorphology greatly and have an important influence on pipeline stability as a result. Based on the above analysis, it is strongly recommended that before pipeline laying, submarine hydrodynamic pattern along the pipeline route must he studied and seabed features affecting pipeline stability should be identified. In the end, some solutions under different situations are provided to reduce the adverse influences of the hazardous features on seabed pipeline stability.