水位涨落作用下加筋路堤稳定性研究  

Stability study on reinforced embankment under action of rise and fall of water levels

作　　者：李丽华 李泽升 肖衡林 漆字巍 叶治 李玉涛 LI Lihua;LI Zesheng;XIAO Henglin;QI Ziwei;YE Zhi;LI Yutao(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake,Ministry of Education,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院河湖健康智慧感知与生态修复教育部重点实验室,湖北武汉430068

出　　处：《岩土工程学报》2024年第S02期1-5,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52278347,U22A20232);湖北省基金创新群体项目(2024AFA009);湖北工业大学杰出人才基金项目(XJ2021000501)。

摘　　要：公路洪水水毁现象愈发频繁,洪水引起的水位涨落对路堤有不可逆的损坏。以加筋路堤边坡为研究对象,考虑不同土工合成材料加筋效果,开展水位涨落模型试验,研究不同类型路堤在水位涨落条件下的水力特征及沉降与破坏模式。试验结果表明:水位涨落过程中,加筋改变了加筋层附近土体的孔隙水压力与土压力变化幅度、体积含水量对水分入渗的响应速度,不同筋材的加筋效果影响规律不同;对比未加筋路堤,孔隙水压力变化幅度在土工格栅加筋路堤中随水位涨、落过程逐步增大,体积含水量在土工布加筋路堤中响应最迅速,两者在土工复合材料加筋路堤中的变化利于路堤稳定,综合考虑,土工复合材料加筋效果最优;水位下落后,未加筋路堤斜坡发生牵引式滑移,加筋路堤均未发生,且加筋有效减小了路堤沉降。研究水位涨落条件下加筋路堤稳定特征对洪水水毁灾害防治具有重要意义。The highway damage due to floods is becoming more frequent,and the rise and fall of water levels caused by the floods has irreversible damage to road embankments.Taking the reinforced embankment slope as the research object,considering the reinforcing effects of different geosynthetics,the model tests on the rise and fall of water levels are carried out to in vestigate,the hydraulic characteristics,settlement and damage modes of different types of embankments.The test results show that during the rise and fall of water levels,the reinforcement changes the pore water pressure and magnitude of change in soil pressure and the rate of response of volumetric water content to water infiltration in the soil near the reinforcement layer,and the reinforcing effects of different reinforcing materials have different impacts.Compared with that of the unreinforced embankment,the change amplitude of the pore water pressure in the geogrid-reinforced embankment increases with the process of rise and fall of water levels,and the response of the volumetric water content in the geotextile-reinforced embankment is the fastest.The change of them is beneficial to the stability of the embankment.The change in the geocomposite-reinforced embankment is favourable to the stability of the embankment,and the effect of geocomposite reinforcement are optimal.After the water level falls,traction slip occurs on the slope of the unreinforced embankment,which does not occur in the reinforced embankment,and the reinforcement effectively reduces the settlement of the embankment.It is of great significance to study the stability characteristics of the reinforced embankment under the rise and fall of water levels for the prevention and control of water damage.

关 键 词：模型试验 加筋路堤 水位涨落 孔隙水压力 破坏模式 

分 类 号：TU43[建筑科学—岩土工程] U416.1[建筑科学—土工工程]