摘要
通过有限差分数值模拟和极限平衡法对比计算,对单排支撑的基坑破坏模式及坑内工程桩对基坑稳定性的影响进行了分析,得到以下结论:坑内工程桩的存在能在一定程度上提高基坑稳定安全系数。单排支撑基坑的失稳滑动面更接近于绕支撑点转动的圆弧滑动面。当基坑发生失稳破坏时,工程桩更容易发生弯曲破坏,考虑坑内工程桩对基坑稳定的贡献时,应取工程桩抗弯破坏时的等效抗剪强度和实际抗剪强度中的较小值。
Using the finite difference method and the limit equilibrium method, the failure modes of excavations and the effect of foundation piles in excavations on excavation stability are investigated. The following conclusions are drawn:(1) The foundation piles can improve the safety factor of stability to certain degree.(2) Instability sliding surface of excavations with single level of horizontal struts is close to the circular slip surface rotating about the supporting point of the strut.(3) When instability of excavations occurs, the foundation piles tend to be subjected to bending failure rather than shear failure. While taking the contribution of foundation piles into consideration, the smaller value between the equivalent shear strength and real shear strength should be used.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2017年第S2期5-8,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51508382
41630641)
国家重点研发计划(2016YFC0802008)
关键词
基坑稳定
工程桩
有限差分法
极限平衡法
等效抗剪强度
excavation stability
foundation pile
finite difference method
limit equilibrium method
equivalent shear strength
