基于边坡稳定性的海底采砂坑边界识别方法研究  

Boundary identification method for submarine sandpit based on slope stability

作　　者：谭海川 唐亮 唐佳 杨肖迪 姚志广 TAN Haichuan;TANG Liang;TANG Jia;YANG Xiaodi;YAO Zhiguang(ShenGang Natural Gas Pipeline Co.,Ltd.,Shenzhen 518000,China;Downhole Operation Division of CNPC Offshore Engineering Company Limited,Tianjin 300451,China;CNPC Engineering Technology Research Co.,Ltd.,Tianjin 300451,China)

机构地区：[1]深港天然气管道有限公司,广东深圳518000 [2]中国石油集团海洋工程有限公司井下作业事业部,天津300451 [3]中国石油集团工程技术研究有限公司,天津300451

出　　处：《石油工程建设》2024年第1期1-6,共6页Petroleum Engineering Construction

摘　　要：海底采砂坑通常具有陡峭的边坡,在海洋动力环境下采砂坑边坡可能会发生滑坡导致采砂坑范围扩大。因此准确探测识别海底采砂坑边界对于分析评估采砂坑对邻近海底管道的影响具有重要意义。目前采砂坑边界识别常用方法是基于海底地貌图像识别和基于海底地形图识别,均是对海底表面进行分析,未考虑到采砂坑边坡稳定性的影响。通过构建采砂坑边坡稳定性分析模型,计算了采砂坑边坡的稳定坡角与坡度,综合采砂坑边坡稳定坡角、采砂坑边坡坡度、海底地形进行综合分析可知:对于坡度大于4.3°的区域,海底边坡不稳定,将边坡顶部的等深线作为采砂坑的不稳定边界;在边坡坡度小于4.3°的区域,海底边坡发生过滑坡,已经稳定,将其内部坡度为4.3°的区域作为采砂坑的不稳定边界。此种方法具有地形和地质的实际意义,可作为识别采砂坑边界的方法。Submarine sandpits usually have steep slopes,and landslides may occur on the slopes of sandpits under marine dynamic environments,leading to the scope expansion of the pit.Therefore,accurately detecting and identifying the boundaries of submarine sandpits is of great significance for analyzing and evaluating the impact of sandpits on adjacent submarine pipelines.At present,the commonly used methods for identifying the boundaries of sandpits are based on submarine landform image recognition and submarine topography map recognition,both of which analyze the seabed surface without considering the impact of slope stability of sandpits.By building a stability analysis model for the sandpit slope,the paper calculates the stable slope angle of the sandpit slope.The paper also calculates the slope of the sandpit and conducts a comprehensive analysis of the stable slope angle of the sandpit slope,the gradient of the sandpit slope,and the submarine topography.For areas with a slope greater than 4.3°,the submarine slope is unstable,and the contour line at the top of the slope is used as the unstable boundary of the sandpit.In areas where the slope gradient is less than 4.3°,landslides have occurred on the submarine slope and have stabilized.Therefore,the area with an internal slope of 4.3°is used as the unstable boundary of the sandpit.This method has a practical significance in terrain and geology and can be adopted to identify the boundaries of sandpits.

关 键 词：海底采砂坑 边坡稳定性 边界识别 等深线 

分 类 号：TD807[矿业工程—矿山开采]