改扩建旧路基开挖台阶雨水渗流的影响  

Influence of Rainwater Seepage on Excavation Steps of Reconstructed and Expanded Old Roadbed

作　　者：梁晨 刘丽萍[1] 余美娴 LIANG Chen;LIU Liping;YU Meixian(School of Civil&Architecture Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021

出　　处：《西安工业大学学报》2022年第6期573-577,600,共6页Journal of Xi’an Technological University

基　　金：西安工业大学2021年国家级大创项目(202110702052)。

摘　　要：为探究降雨对改扩建旧路基开挖台阶土体性质的影响,文中利用ABAQUS有限元软件对台阶内雨水渗流进行模拟,分析台阶雨水渗流特征和基质吸力等土体性质变化。结果表明:降雨初期雨水渗流以竖向渗流为主,水平渗流强度与降雨时长呈正相关;路床第二级台阶高0.4 m,路基第一级台阶高0.8 m,考虑地下水的影响,临近破坏时路床第二级台阶底部基质吸力比路基第一级台阶底部大6.5%,路床台阶在降雨72 h先发生破坏,说明台阶破坏受到高度的影响;不同降雨时长下路床超挖段路基土的基质吸力存在反弯点,12 h和24 h影响深度增幅最大,持续降雨60 h,雨水平均影响深度约1.0 m。In order to explore the impact of rainfall on the soil properties of excavation steps of reconstructed and expanded old roadbed,the paper uses ABAQUS finite element software to simulate rainwater seepage in benches,and analyzes the characteristics of rainwater seepage in benches and changes in soil properties such as matrix suction.The results show that the vertical seepage is dominant in the initial rainfall,and the horizontal seepage intensity is positively correlated with the rainfall duration;The second step of the roadbed is 0.4 m high,and the first step of the roadbed is 0.8 m high.Considering the influence of groundwater,the matrix suction at the bottom of the second step of the roadbed is 6.5%greater than that at the bottom of the first step of the roadbed when the damage is near.The roadbed steps are damaged first after 72 h of rainfall,indicating that the damage of the steps is affected by the height;The matrix suction of roadbed soil in the overbreak section of roadbed under different rainfall duration has a reverse bend point,and the influence depth increases most in 12 h and 24 h.The average influence depth of rainwater is about 1.0 m after 60 h of continuous rainfall.

关 键 词：路基 雨水渗流 基质吸力 降雨时长 

分 类 号：U416.12[交通运输工程—道路与铁道工程]