局部软弱夹层对挡泥坝稳定性的影响分析  

Effect of local weak intercalary strata on stability of mud-retaining dam

作　　者：蔡学石 薛润泽 徐满意[2] 王洋 孟静[2] 刘孟孟 CAI Xue-shi;XUE Run-ze;XU Man-yi;WANG Yang;MENG Jing;LIU Meng-meng(Dalian Donggang Business District Development Construction Management Group Co.,Ltd.,Dalian 116001,China;Tianjin Research Institute for Water Transport Engineering,National Engineering Laboratory for Port Hydraulic Construction Technology,Key Laboratory of Harbor&Marine Structure Safety,Ministry of Transport,Tianjin 300456,China)

机构地区：[1]大连东港商务区开发建设管理集团有限公司,大连116001 [2]交通运输部天津水运工程科学研究所港口水工建筑技术国家工程实验室水工构造物检测、诊断与加固技术交通行业重点实验室,天津300456

出　　处：《水道港口》2019年第6期708-713,共6页Journal of Waterway and Harbor

基　　金：天津市重点研发计划(18YFZCSF00490);天津市自然科学基金(16JCYBJC22200);中央级公益性科研院所基本科研业务费专项资金资助(TKS180203,TKS160106)

摘　　要：以大连某填海造地工程为例,研究了局部软弱夹层对挡泥坝边坡稳定性的影响规律。通过现场地勘判定软弱夹层位置,采用数值分析方法建立挡泥坝模型,基于极限平衡理论讨论了局部软弱夹层对软基上挡泥坝稳定性的影响。分别采用瑞典圆弧法、简化毕肖普法、摩根斯坦-普瑞斯法,对比分析边坡坡比对挡泥坝稳定性安全系数及最危险滑弧位置的影响。分析结果显示,最危险滑弧会经过软弱夹层,使得挡泥坝稳定性显著降低,边坡坡比会对滑弧深度产生影响,不同的边坡稳定性计算方法得到的安全系数具有良好的一致性。研究表明,清淤不彻底会显著影响挡泥坝的边坡稳定性,对坝后吹填作业产生严重隐患,应该给予足够重视。Taking a reclamation project in Dalian as an example,the influence of local weak intercalary strata on the slope stability of mud-retaining dam was studied.The location of weak intercalation was determined by field geological exploration,and models of mud-retaining dam were established through the numerical analysis method.Based on the limit equilibrium theory,the influence of local weak intercalary strata on the stability of mud-retaining dam on soft foundation was analyzed.The influences of slope ratio on the safety factor of stability and the position of the most dangerous sliding arc of mud-retaining dam were analyzed by adopting different methods such as Sweden Arc Method,simplified Bishop method and Morgenstern-Price method.Results show that the most dangerous sliding arc always passes through the weak interlayer,which significantly reduces the stability of the mud-retaining dam.The depth of the sliding arc is affected by the slope ratio.There is a well agreement among the safety factors obtained by different calculation methods of slope stability.Incomplete dredging can significantly affect the slope stability of the mud-retaining dam,which is potential danger for the hydraulic fill behind the dam and should be given enough attention.

关 键 词：软土地基 边坡稳定性 圆弧滑动 数值模拟 挡泥坝 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]