摘要
介绍了某滨海景观道路工程的背景和桩基施工过程中发生的临海水下边坡滑坡现象,初步讨论了导致滑坡的可能原因。基于极限平衡理论,分别对平均潮位、退潮时水位骤降、坡上桩基施工钢套管锤击振动导致浅海饱和软黏土强度降低的三种工况,采用Geostudio软件进行了临海岸坡的稳定性分析。分析结果表明,考虑退潮引起的水位骤降因素后,该边坡稳定安全系数下降,接近临界稳定状态,潜在滑动面发生在上层强度较低的高灵敏性淤泥质软黏土层。在同时考虑退潮水位骤降和坡上桩基施工扰动的工况下,边坡稳定安全系数小于1,即岸坡处于不稳定状态,滑动面仍位于软黏土层但滑动深度有所减小。研究成果较好地解释了此次滑坡事故的触发机理,可为类似工程提供参考,避免类似滑坡事故再次发生。
This paper describes the background of a landscape road project and the landslide of coastal slope during pile foundation construction,and discusses the possible causes of landslide.Based on limit equilibrium theory,the stability of coastal slope is analyzed by Geostudio software under three conditions:average tide level,sudden drop of water level during ebb tide,and strength reduction of shallow saturated soft clay caused by hammering vibration of steel casing during pile foundation construction on slope.It is shown that the safety factor of slope stability decreases after the sudden drop of water level caused by the ebb tide,and the slope is close to the critical stability state.The potential sliding surface occurs in the soft clay layer with low upper strength and high sensitivity.Under the condition of considering the sudden drop of tide level and disturbance of pile foundation construction on the slope,the safety factor of slope stability is less than 1,that is,the bank slope is in an unstable state,and the sliding surface is still in the soft clay layer,but the sliding depth decreases.The research results reveal the triggering mechanism of the landslide,and can provide reference for similar projects and avoid landslide hazards.
作者
应宏伟
黄兆江
周建
朱成伟
唐远东
沈华伟
YING Hong-wei;HUANG Zhao-jiang;ZHOU Jian;ZHU Chen-wei;TANG Yuan-dong;SHEN Hua-wei(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Engineering Research Center of Urban Underground Development of Zhejiang Province,Hangzhou 310058,China;MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 311100,China)
出处
《地基处理》
2019年第1期48-52,共5页
Journal of Ground Improvement
关键词
临海岸坡
水位骤降
施工扰动
极限平衡法
稳定性分析
coastal slope
water level drop
construction disturbance
limit equilibrium method and stability analysis
