长岛群岛边坡稳定性分析及治理紧迫性评价  

Stability Analysis of Island Slope and Evaluation of Treatment Urgency in the Changdao Islands

作　　者：刘昊 修宗祥 刘乐军 李保石 张志卫 田梓文 杨江辉 LIU Hao;XIU Zongxiang;LIU Lejun;LI Baoshi;ZHANG Zhiwei;TIAN Ziwen;YANG Jianghui(First Institute of Oceanography,MNR,Qingdao 266061,China;China Offshore Oil Engineering Corp CNOOC Ltd,Tianjin 300461,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061 [2]海洋石油工程股份有限公司,天津300461

出　　处：《海岸工程》2024年第4期321-335,共15页Coastal Engineering

基　　金：国家自然科学基金项目(41876066和41606084)。

摘　　要：针对长岛群岛41处岩质与土质易失稳边坡,在开展资料收集和现场地质调查研究的基础上,分析了边坡的潜在失稳机制及影响因素,基于有限元的饱和-非饱和渗流模拟方法和有限元强度折减方法,模拟分析了目标坡体未降雨与潜在极端降雨工况下的稳定性,并分别采用非线性有限元接触算法与耦合欧拉-拉格朗日大变形方法,定量模拟了潜在岩体崩落和土质坡体滑动的动态失稳过程。分析结果表明:岩质边坡具有较好的整体稳定性,但坡面岩体松动带来的潜在崩落风险较大;土质边坡规模虽然相对较小,在极端降雨和不利裂隙情况下部分高陡边坡具有一定的失稳可能性。最后,采用模糊综合评价法分别对上述两类易失稳边坡的治理紧迫性进行了综合排序,为研究区海岛边坡后续的详细评估与治理提供一定的参考。To address the easy instability of 41 rock and soil slopes in the Changdao Islands,the potential slope instability mechanisms and their influencing factors are analyzed on the basis of data collection and field geological investigations.Based on the methods for the saturated-unsaturated seepage simulation of finite element and for the finite element strength reduction,the stability of the target slopes is analyzed and simulated under the conditions of non-rainfall and potential extreme rainfall,and the dynamic destabilization processes induced by potential rock collapse and soil slope sliding are quantitatively simulated by using respectively the nonlinear finite element contact algorithm and the coupled Eulerian-Lagrangian approach.The analysis results show that the rocky slopes have a better overall stability,but the potential risk of collapse caused by loose rock mass on the slope surface is relatively higher.Although the scale of the soil slopes is relatively smaller,some high and steep slopes have a certain possibility of instability under the conditions of extreme rainfall and adverse crack.Finally,the treatment urgency of the two easy instable slopes mentioned above is comprehensively ranked by using fuzzy comprehensive evaluation method,which can provide certain reference for the future detailed evaluation and treatment of the slopes in the Changdao Islands.

关 键 词：海岛边坡 边坡稳定性 降雨 滑坡危害性 模糊评价 

分 类 号：P67[天文地球—海洋地质]