摘要
在现场试验基础上,研究沉管干振挤密抗拔防浮碎石桩在拉压循环荷载和拉拔循环荷载下单桩及其抗拔钢筋的性状。研究表明,随拉压循环次数的增加,应力向钢筋集中,钢筋承受的拉力随之增大,抗拔力大部分由底部的锚固头提供。拉压循环对抗拔碎石桩受力和变形影响较小,无论上拔力大小,卸载后都有残余变形,并随着拉拔循环次数的增加而略有增加。拉拔循环荷载对变形的影响较小,未达破坏荷载前,抗拔碎石桩的抗拔承载力与变形有较明显的线性关系,抗拔碎石桩破坏性状明显,能明确得到抗拔碎石桩的破坏荷载。
Based on the in-situ tests, the behaviors of single diving dry-vibrated compacted and anti-pull stone column with steel bars are studied during the compression-uplift cyclic loading. The study shows that the stresses are concentrated in the reinforcing steel bar and increase with the number of cycle. The bolted body of bottom mainly provides anti-pull bearing capacity. Compression-uplift cyclic loading has little effect on the settlement and stress of anti-pull stone column. Residual strain always exists after unloading no matter the pullout force is large or small, and increases slowly with the number of cycle. Uplift cyclic loading has little effect on the settlement of anti-pull stone column. Anti-pull bearing capacity and settlement of anti-pull stone column have visible linear relations before reaching the failure load. The failure characteristics of anti-pull stone column are very clear and the failure load of the anti-pull stone column can be obtained easily.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第3期507-512,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
地基基础
沉管干振挤密抗拔防浮碎石桩
循环荷载
循环次数
残余变形
Bearing capacity
Cyclic loads
Failure (mechanical)
Residual stresses
Settlement of structures
Soil mechanics
Strain
Vibrations (mechanical)
