摘要
边坡的安全稳定目前仍是工程的重要问题。文中假定土体符合理想的弹塑性本构模型,建立了坡顶超载下的二级边坡计算模型,运用极限分析上限定理和强度折减法,确定边坡安全系数的上限解,同时探究边坡不同参数对安全系数的影响情况,结果表明坡顶超载的增大导致边坡安全系数的减小;边坡倾角越大,安全系数随坡顶荷载增大而降低的速度越慢;内摩擦角的减小和宽高比的增大,影响边坡安全系数逐渐减少;随着荷载至坡肩水平距离的增大,坡顶超载的影响不断减弱,当此距离足够远时,超载强度对边坡稳定性基本没有影响,说明坡顶荷载对边坡的稳定性影响具有一定的作用距离。分析结果对坡顶超载下的边坡稳定性评估及设计施工具有一定参考价值。
The safety and stability of slope is still an important problem in engineering.Based on the assumption that the soil conforms to the ideal elastic-plastic constitutive model,a two-stage slope calculation model under the overload of the slope top is established.The upper limit solution of the slope safety factor is determined by using the upper limit theorem of limit analysis and the strength reduction method.At the same time,different parameters of the slope are studied.The results show that the increase of the overload of the slope top results in the decrease of the slope safety factor.The larger the slope angle is,the slower the safety factor will decrease with the increase of the load on the top of the slope;The decrease of the internal friction angle and the increase of the width height ratio will reduce the safety factor of the slope.In addition,with the increase of the horizontal distance from the load to the shoulder of the slope,the influence of the overload on the top of the slope will continue to weaken.When the distance is far enough,the overload strength has no effect on the stability of the slope basically,which shows that the load on the top of the slope has no effect on the side and the stability of slope has a certain distance.The analysis results have certain reference value for slope stability evaluation for design and construction under the overload of slope top.
作者
饶平平
倪雪
师昀巍
RAO Pingping;NI Xue;SHI Yunwei(Department of Civil Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《低温建筑技术》
2020年第2期84-87,121,共5页
Low Temperature Architecture Technology
关键词
坡顶超载
安全系数
极限上限
边坡稳定性
overload on the top of the slopes
safety factor
upper-bound limit analysis
slope stability
