摘要
目前深基坑桩锚支护结构的研究已引起学者的高度关注,支护结构与土体之间协同工作的研究仍然是一个亟待深入研究的课题。以桩锚支护结构与土体相互作用体系为研究对象,考虑桩后土抗力与锚杆拉力共同作用,建立静力平衡方程,在前人总结的桩锚变形协调条件的基础上,对其进行改进,并与变形协调条件的其他3种算法对比。结果表明,改进的方法更能反映桩锚支护结构受力变形的实际情况,由此算得的锚杆设计拉力较其他方法算得的锚杆设计拉力偏大,这是因为克服了前述方法中忽略锚杆倾角、增大了锚杆的伸长量以及未考虑桩锚实际受力状态的缺点。结合工程实例,应用FLAC^(3D)模拟的桩身内力与改进方法算得的桩身内力基本吻合,说明改进方法的优越性。
The studies of pile-anchor supporting structure of deep foundation pits have aroused the attention of scholars, and the interaction between supporting structure and soil still needs to be further researched. We established the static equilibrium equation considering the combined action of soil resistance after the pile and anchor tensile. The pile anchor deformation compatibility condition is modified and compared with the other three algorithms of deformation compatibility condition. The results show that the improved method can reflect the actual situation of the pile anchor supporting structure deformation. The designed pulling force of anchor is larger than other methods of designed pulling force of anchor. To overcome the ignored obliquity of the anchor, the anchors＇ elongation is increased and the stress states are not considered. FLAC^3D is used to simulate the pile body＇s internal force. The calculated internal force of pile body by the modified method is consistent, indicating the advantage of the proposed method.
作者
周勇
朱亚薇
ZHOU Yong;ZHU Ya-wei(Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Western Center of Disaster Mitigation in Civil Engineering,Ministry of Education,Lanzhou,Gansu 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第9期3246-3252,共7页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51568042)
教育部长江学者和创新团队发展计划(No.IRT_17R51)~~
关键词
桩锚结构
深基坑
变形协调
内力
结构变形
structure of pile-anchor
deep excavation
deformation coordination
internal force
structural deformation
