摘要
缓倾红层边坡易在开挖施工扰动下发生灾害。本文以云南一边坡为例,分析该类边坡特征,建立边坡简化模型计算不同开挖方式下边坡的稳定性,分析开挖高度、开挖进尺、开挖角度对缓倾红层边坡的影响。结果表明:随着开挖高度的增加坡体稳定性逐渐下降,但是当开挖高度达到中部夹层以下时,坡体稳定性不再发生变化;随着开挖角度的增大,坡体临空面角度增大,坡体稳定性也逐渐降低;随着开挖进尺的增加,坡体应力曲线弯曲程度逐渐减小,应力集中程度也随之减小,坡体稳定性增强。
The slope of gently inclined red bed is prone to slope disaster under the disturbance of excavation construction.Taking a side slope in Yunnan province as an example in this paper,the characteristics of this type of slope were analyzed and a simplified slope model was established to calculate the stability of the slope under different excavation methods.The influence of excavation height,footage and angle on the gently inclined red bed slope was analyzed.The results show that the slope stability gradually decreases with the increase of excavation height.However,the slope stability will no longer change when the excavation height reaches below the middle interlayer.With the increase of excavation angle,the free face angle of slope increases,and the stability of slope decreases gradually.With the increase of excavation footage,the bending degree of slope stress curve gradually decreases,the stress concentration degree also decreases,and the slope stability is enhanced.
作者
刘洪瑜
张玉芳
李嘉明
侯李杰
李健
LIU Hongyu;ZHANG Yufang;LI Jiaming;HOU Lijie;LI Jian(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《铁道建筑》
北大核心
2020年第11期98-101,共4页
Railway Engineering
基金
国家重点研发计划(2018YFC1504902)
中国铁路总公司科技研究开发计划(P2018G001)。
关键词
公路路基
开挖方式
数值计算
缓倾红层边坡
稳定性分析
highway subgrade
excavation method
numerical calculation
gently inclined red bed slope
stability analysis
