某含淤泥层边坡失稳机制及治理措施  

The instability mechanism of a slope with silt layer and its treatment

作　　者：尹长权[1,2,3,4] YIN Chang-quan(CCCC Tianjin Port Engineering Institute,Co.,Ltd.,Tianjin 300222,China;Key Laboratory of Geotechnical Engineering of Ministry of Communications,Tianjin 300222,China;Key Laboratory of Geotechnical Engineering of Tianjin,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China)

机构地区：[1]中交天津港湾工程研究院有限公司 [2]港口岩土工程技术交通行业重点实验室 [3]天津市港口岩土工程技术重点实验室 [4]中交第一航务工程局有限公司

出　　处：《中国港湾建设》2019年第10期12-16,共5页China Harbour Engineering

基　　金：天津市自然科学基金一般项目(16JCQBJC21700)

摘　　要：在某含淤泥层的地基上开挖边坡时发生了较大规模的边坡失稳,待失稳坡体稳定后采取了一系列的处理措施,以实现边坡的稳定开挖。文中详细阐述了边坡发生滑动的全过程,通过现场勘察和边坡监测结果,分析了边坡发生不稳定的原因。调查显示,淤泥层的灵敏度系数较大、强度低,施工机械的震动使开挖底部的淤泥受到扰动,从而导致淤泥的强度显著降低,局部失稳导致边坡整体渐进式失稳。边坡治理的成败经验表明;在卸荷状态时,不宜采用自重排水固结法对淤泥进行加固;采用设置的预留放坡肋的方式,能够有效的提高边坡的稳定性。In the geological excavation of a silt layer,a large scale slope failure occurred,and a series of engineering measures were taken to stabilize the slope after the instability of the slope body was stabilized.In this paper,the whole process of slope sliding is elaborated in detailed,and causes of slope failure are analyzed through field investigation and slope monitoring results.The investigation results show that the sensitivity coefficient of the silt layer is large and its strength is low.The construction machinery vibration disturbs the silt at the bottom of the excavation,which results in a significant decrease in the silt strength,and the local instability leads to the whole slope progressive failure.The experience of the success or failure of slope treatment shows that when unloading state,drainage consolidation by self-gravity should not be used to reinforce the silt;reserved sloping rid can effectively improve the stability of the slope.

关 键 词：边坡失稳 软黏土层 预留放坡肋 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] TU432[交通运输工程—船舶与海洋工程]