摘要
渗流作用对临河基坑边坡稳定性有较大影响,对工程设计及施工有重要的指导意义。为深入研究河水渗流对基坑边坡稳定性的影响,针对湖南省某扩建二线船闸基坑边坡,利用有限元数值仿真技术,采用渗流与强度折减法相结合的方法,获取不同水位下该基坑边坡的孔隙水压力分布特征,分析河水位变化对边坡应力、位移的影响,探讨边坡安全系数的演变规律。结果表明:河水位的升降仅对一级坡有较为明显的影响,随着河水水位的上升,边坡安全系数在逐渐减小,但水位在37~45 m时安全系数均大于规范要求值。
Seepage action has a great influence on the stability of foundation pit slope near river,and has important guiding significance for engineering design and construction.In order to further study the influence of seepage on the stability of foundation pit slope,we use the finite element technology to analyze a foundation pit slope of expansion second ship lock in Hunan Province,adopt the combination of seepage and strength reduction method to acquire the distribution characteristics of pore water pressure,analyze the river level variation’s influence on slope stress and deformation,and discuss the evolving rules of slope safety factor.The results show that the rise and fall of river level only has significant impact on the first-level slope.With the increase of river level,the slope safety factor gradually decreases,and the safety factor keeps higher than specification required value when river level is in the range from 37 m to 45 m.
作者
汪映红
董城
陈乐
WANG Ying-hong;DONG Cheng;CHEN Le(Hunan Provincial Water Transportation Construction&Investment Group Co.,Ltd.,Changsha 410011,China;Hunan Communications Research Institute Co.,Ltd.,Changsha 410015,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《水运工程》
北大核心
2019年第3期121-125,共5页
Port & Waterway Engineering
关键词
渗流作用
水位变化
基坑边坡
强度折减法
安全系数
seepage action
water level change
foundation pit slope
strength reduction method
safety factor