摘要
为研究"边坡-地基"所存在的地基承载力和边坡失稳问题,考虑不同基础宽度B与坡顶距De,建立了12个"边坡-地基"模型,采用2种解析法和2种有限元法,分析了"边坡-地基"的变形破坏模式,讨论了边坡失稳极限荷载和地基极限承载力。结果表明:"边坡-地基"的破坏模式随荷载的增加发生3种模式的变化;对于"边坡-地基"问题,传统水平地基承载力算法并不适用,且随着坡顶距增大,Saran解与其他解的误差也逐渐增大,基于塑性理论的解析法无法较好地全面考虑边坡对地基的影响问题;基于弹塑性理论的有限元强度折减法和有限元载荷数值试验方法得到的极限荷载基本一致,两者算得的极限荷载可以认为是"边坡-地基"严格意义上的极限承载力。
Twelve types of＂slope-foundation＂model were developed to analyze the deformation failure mode of＂slope-foundation＂by using the finite element strength reduction method,in which different foundation width Band different distance between slope edge and slope shoulder Dewere evaluated.In addition,the ultimate load and the ultimate bearing capacity of slope-foundation were also evaluated.The results showed that there are three types of failure mode with the increase of loading.The traditional bearing capacity algorithm is not suitable for the slope-foundation problem.The difference between Saran solution other solutions increased with the increase of distance between slope edge and slope shoulder.The analytical solution based on plasticity-theory also cannot fully evaluate the bearing capacity of the foundation with the inclusion of slopes.The solution from finite element strength-reduction method based on elastic-plastic theory agrees well with the solution from finite element numerical approach.The ultimate bearing capacity from solutions can be considered to be the true ultimate bearing capacity for the slope-foundation.
出处
《中国科技论文》
CAS
北大核心
2018年第1期12-16,22,共6页
China Sciencepaper
基金
"十二五"国家科技支撑计划重点项目(2015BAK09B01)
重庆市基础与前沿研究计划项目(重点)(cstc2015jcyjBX0139)
重庆市研究生科研创新项目(CYB17126)
关键词
边坡-地基
极限荷载
极限承载力
强度折减法
载荷数值试验
安全系数
破坏模式
slope-foundation
ultimate load
ultimate bearing capacity
strength reduce method
load numericator
test
safety factor failure mode
