摘要
为探究大粒径石块分布对土石混合体稳定性的影响,通过图像处理技术获取土石混合体模型,并在此模型基础上,建立了大粒径石块处于不同位置和角度的物理模型。利用有限元软件ABAQUS进行解算分析,得出:①大粒径石块集中在模型上部区域时,塑性区主要分布在模型下半部分,土石混合体强度较高,稳定性较好;大粒径石块集中在模型下部区域时,土石混合体强度低、稳定性较差;大粒径石块集中区阻碍了土石混合体塑性破坏的发展,且分布位置不同起到的承载能力不同。②土石混合体强度及稳定性随大粒径石块长轴倾角增大呈现出先减小后增大趋势,在大粒径石块长轴倾角处于45°~60°时,模型强度最小、稳定性最差,这与摩尔-库伦强度准则中所描述的剪切滑移面角度一致。研究结果可为露天矿边坡及各类人造土石坝体的稳定性设计提供参考。
In order to explore the influence of big stones distribution on the stability of soil-rock mixture,the soil-rock mixture model was obtained by image processing technology.Based on this model,the physical model of big stones in different locations and angles were established.The finite element software ABAQUS was used for analysis.The results show that when the big stones are concentrated in the upper part of the model,the plastic area is mainly distributed in the lower part of the model,and the strength of the soil-rock mixture is higher and the stability is better.When the big stones are concentrated in the lower part of the model,the strength and stability of the soil-rock mixture are low.The development of plastic failure of soil-rock mixture is hindered by the concentrated area of big stones,and its bearing capacity is different depending on the distribution location.Both the strength and stability of the soil-rock mixture decrease first and then increase with the increase of the long axis angle of big stones.When the long axis angle of big stones is between 45°to 60°,the model has the smallest strength and the worst stability,which is consistent with the angle of the shear slip surface described in the Molar-Coulomb strength criterion.The research results can provide reference for the stability design of open pit slopes and various artificial soil-rock dams.
作者
杨小彬
侯鑫
裴艳宇
阚李浩
吕祥锋
YANG Xiao-bin;HOU Xin;PEI Yan-yu;KAN Li-hao;LüXiang-feng(School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China;School of Civil and Resource Engineering, University of Science & Technology Beijing, Beijing 100083, China)
出处
《科学技术与工程》
北大核心
2020年第31期12962-12967,共6页
Science Technology and Engineering
基金
国家自然科学基金(50904071,51274207)。
