孟加拉湾MADE KYUN河三角洲海底斜坡稳定性数值分析  

Numerical Analysis for Stability of Submarine Slope of the MADE KYUN River Delta in the Bay of Bengal

作　　者：周其坤[1] 孙永福[1] 胡光海[1] 袁顺新[2] 丁继胜[1] 张海泉[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]中国石油天然气管道工程有限公司,河北廊坊065000

出　　处：《海洋科学进展》2014年第3期355-362,共8页Advances in Marine Science

基　　金：国家海洋公益性行业科研专项--近海海底地质灾害预测评价及防控关键技术研究(201005005)

摘　　要：对MADE KYUN河三角洲海底斜坡所在区域地形地貌、地层岩性等进行阐述分析,结合调查资料确定了斜坡坡体组成与特征：该斜坡坡体主要为淤泥、淤泥质黏土,厚度6～9m.基于GEO-SLOPE软件的SLOPE/W模块计算斜坡稳定性安全系数并确定最危险滑动面,利用BING软件的Herschel-Bulkley模型、双线型模型对最危险滑动面的滑移距离进行模拟预测.数值分析结果表明：在考虑孔隙水压力的情况下,4种计算方法得到的稳定性系数均有所下降,M-P法计算得到的斜坡稳定性安全系数为0.606,处于不稳定状态;2种模型计算得到的滑移距离分别为207和213 m,峰值滑移速率分别为7.80和9.33 m/s,会对较大范围的海底管道等海底设施造成破坏性影响.This study analyzed the geomorphology and strata＇s lithology in the slope area of the MADE KYUN river delta in the Bay of Bengal.The results,combined with actual survey data,have been used to determine the composition and character of the slope as follows.The slope is mainly composed of mud and muddy clay with the thickness of 6m to 9m.Based on the SLOPE/W mode in GEO-SLOPE software,this study calculated the safety factor of slope stability and determined the most dangerous sliding surface.And,this study predicted the runout distance of the most dangerous sliding surface by using HerschelBulkley model and Bilinear model in BING software.The above numerical analysis results showed under considering the pore pressure,the safety factor of slope stability calculated by 4 different methods decrease in some degree,and the slope＇s safety factor calculated by Morgenstern-Price is 0.606 suggesting its unstable state.The runout distance calculated by two different models is 207 m and 213 m,respectively,and the maximum runout velocity is 7.80 m/s and 9.33 m/s,respectively.Therefore,the slide behavior of the slope may make damage to the submarine facilities such as the submarine pipeline.

关 键 词：孟加拉湾 GEO-SLOPE 海底稳定性 BING 滑移距离 

分 类 号：P736[天文地球—海洋地质]