摘要
为研究强降雨作用对含软弱带填方边坡稳定性的影响,以陕西省延安市某基覆型边坡为例,测定边坡土体基本物理力学参数,并对其固结三轴试验结果进行分析,基于试验结果对参数进行标定后利用数值模拟软件Geo-Studio分析了不同降雨方式以及坡型对填方边坡稳定性的影响.研究结果表明:(1)通过三轴试验得到土体黏聚力为30.2 kPa,内摩擦角为23°,三轴压缩过程中应变曲线由应变硬化向应变软化逐步过渡.(2)降雨雨强、降雨持续时间、坡高、坡度以及软弱层厚度的增加均会导致填方边坡稳定性系数降低,递减型降雨对边坡稳定性影响最为严重.(3)软弱带厚度的增加会导致土体中的水分向软弱带迁移,使软弱带处于局部饱水状态,增加了边坡失稳的可能性.
To investigate the impact of heavy rainfall on the stability of fill slopes with weak zones,this study takes a base-covered slope in Yan'an City,Shaanxi Province as an example.It determines the basic physico-mechanical parameters of the slope's soil and analyzes the results of the consolidation triaxial test.Using Geo-Studio numerical simulation software,the effects of different rainfall patterns and slope types on the stability of fill slopes are analyzed after calibrating the parameters based on test results.The results show that:The soil cohesion is 30.2 kPa,the internal friction angle is 23°,and the strain curve transitions from strain hardening to strain softening during the triaxial compression process.Increased rainfall intensity,duration,slope height,slope gradient,and weak layer thickness all decrease the fill slope stability coefficient,with decreasing rainfall having the most severe impact on stability.The thickness of the weak zone significantly affects slope stability.Increased weak zone thickness causes water to migrate into the weak zone,creating a locally water-saturated state and increasing the risk of slope instability.
作者
覃尚文
郭鹏飞
QIN Shangwen;GUO Pengfei(Guangxi Road and Bridge Engineering Group Co.Ltd.,Nanning 530200,China;State Key Laboratory of Tunnel Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《河南科学》
2024年第8期1145-1152,共8页
Henan Science
基金
基于物联网光学非接触变形测试技术的高边坡安全监测与评估研究(2022-MSI-027)。
作者简介
覃尚文(1984-),男,高级工程师,主要从事公路工程相关施工管理工作;通信作者:郭鹏飞(1989-),男,助理研究员,博士,主要从事深部岩体灾害防控及隧道工程相关工作。
