地下室锚杆抗拔试验与分析

Experiment and Analysis of Anti-Floating Anchor Pullout Test of Basement

总结了抗拔锚杆桩承载力的经验计算方法。蚌埠市某住宅项目工程设计采用768根抗浮锚杆,锚固段长度是16 m,锚固直径为150 mm,对其中8根锚杆进行了抗拔试验。测试结果表明,加载至300 kN时,上拔位移为10.35 mm^12.69 mm,且能达到稳定状态,卸载后残余位移约为最大位移的2/3,试验锚杆抗拔承载力均满足设计要求。通过试验结果数据拟合得到Q-S曲线,预测了锚杆的抗拔极限承载力,并与不同经验方法计算结果进行了对比,结果表明不同方法计算结果与预测值略有差异,但均大于实测最大加载值300 kN。

The experience calculation methods of the pullout capacity of anchor pile are summarized in this paper. An engineering design of 768 pieces of anti-floating anchor was adopted in Bengbu city, and all the anchoring depth is 16 m, anchorage diameter is 150 mm. 8 pieces of anchor were selected to perform the pull-out tests. The test results show that, the range of uplift displacement is from 10.35 mm to 12.69 mm when the load reaches up to 300 kN, and it can reach a stable state. The residual displacement is about 2/3 of the maximum displacement after unloading, and all the anchors meet the design requirements of uplift bearing capacity test. The Q-S fitting curve is obtained by approximate prediction of bearing capacity of anchor pullout from the test results. Meanwhile, the results were compared with different calculation methods, and it shows that there is a slight difference between different calculation methods and predictive value. Nevertheless, they are all larger than the measured maximum load value 300 kN.