摘要
高陡岩质临坡地基承载力是高陡边坡工程设计的关键因素之一。本文通过不同坡度的高陡岩质临坡地基室内模型试验,得到了不同坡度高陡岩质临坡地基的破坏模式和承载力变化规律,在此基础上,采用极限平衡法结合Mohr-Coulomb破坏准则,提出了岩质临坡地基单侧滑动破坏模式下的地基极限承载力计算方法,并将理论计算结果与试验结果进行了对比验证;同时,对不同黏聚力及内摩擦下临坡地基承载力随坡度及坡距的变化规律进行了研究。结果表明:1)高陡岩质临坡地基存在临界坡距,当坡距小于临界坡距时,临坡地基发生单侧破坏;当坡距大于临界坡距时,临坡地基发生完整地基破坏模式。2)坡度由65°增大至85°时,临坡地基极限承载力近似线性减小;坡距由0增大至临界坡距时,临坡地基承载力逐渐增大,并不断趋近完整地基极限承载力。
The bearing capacity of high-steep rock slope foundation is one of the key factors in the design of high-steep slope engineering.This paper carried out the indoor model test of high-steep rock slope foundation with different slopes,obtaining the failure modes and bearing capacity variation rules.Then,this paper derived a calculation method for the ultimate bearing capacity of the foundation under the unilateral sliding failure mode of the rock slope foundation by combining the limit equilibrium method with the Mohr-Coulomb strength criterion,and compared the theoretical calculation results with the experimental results.Additionally,it studied the variation of the bearing capacity of slope foundations with slope gradients and distances under different cohesion and internal friction angles.The research results show that:1)There is a critical slope distance in the high and steep rock slope foundation.When the slope distance is less than the critical slope distance,unilateral failure occurs in the slope foundation.When the slope distance is greater than the critical slope distance,the slope foundation exhibits a complete foundation failure mode.2)When the slope gradient increases from 65°to 85°,the ultimate bearing capacity of the foundation near the slope decreases approximately linearly.When the slope distance increases from 0 to the critical slope distance,the bearing capacity of the slope foundation gradually increases and continuously approaches the ultimate bearing capacity of the complete foundation.
作者
杜依吒
雷勇
陈于斯
DU Yizha;LEI Yong;CHEN Yusi(Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)
出处
《湖南城市学院学报(自然科学版)》
2025年第4期12-20,共9页
Journal of Hunan City University:Natural Science
基金
国家自然科学基金项目(51208195,52178332)
湖南省自然科学基金项目(2022JJ30253)。
关键词
高陡岩质临坡地基
极限承载力
临坡地基单侧滑动模型
极限平衡法
high-steep rock slope foundation
ultimate bearing capacity
unilateral sliding model of slope foundation
limit equilibrium method
