软土地基袋装砂海堤变形与稳定特性研究  

Study on Deformation and Stability Characteristics of Sand Filled GeotextileContainer Coastal Dike on Soft Soil Foundation

作　　者：陈华鸿[1] 徐嘉[2] CHEN Hua-hong;XU Jia(Tianjin Municipal Water-conservancy Survey and Design Institute,Tianjin 300204,China;Hydrology Bureau of Haihe River Water Conservancy Commission,MWR,Tianjin 300170,China)

机构地区：[1]天津市水利勘测设计院,天津300204 [2]海河水利委员会水文局,天津300170

出　　处：《海河水利》2019年第1期37-40,43,共5页Haihe Water Resources

摘　　要：基于现场试验和数值模拟的方法,对软土地基袋装砂海堤的变形与稳定特性进行了研究。研究结果表明,水平位移随着深度增大呈现出先增大后减小的趋势;随着堤身填筑高程的增大,沉降量不断增大,整体稳定安全系数逐渐降低,浅表层软土对海堤总沉降和稳定性影响显著,海堤采用袋装充填砂,土工织物袋本身具有较好的抗拉强度,潜在滑动面更容易出现在没有土工织物袋的堤身部分。堤外水位骤降对海堤整体稳定不利,随着骤降水位的不断降低,水位差不断变大,海堤临海侧边坡整体稳定性不断降低,安全系数不断减小。Based on field testing and numerical simulation method,the deformation and stability characteristics of sand is studied which is filled geotextile container coastal dike on soft soil foundation.The results show that the horizontal displace.ment increases first and then decreases with the increase of depth.With the increase of dike construction height,the settle.ment increases,and the overall stability safety coefficient gradually decreases.The shallow surface soft soil has a significant influence on the total settlement and stability of the dike.Dike is filled with the sand filled geotextile container,which has good tensile strength,so that the potential slip surfaces are more likely to appear in somewhere without geotextile bags.The sudden drop of water level outside the dike is detrimental to the overall stability of the dike.With the continuous decrease of the sudden drop in water level,the water level difference is getting larger,the overall stability of the sea side slope of the dike is continuously reduced,and the safety factor is continuously decreasing.

关 键 词：袋装砂海堤 变形稳定 现场试验 数值模拟 

分 类 号：TV131.61[水利工程—水力学及河流动力学]