富水深基坑钢筋抗浮锚杆抗拔承载特性试验与预测研究

EXPERIMENTAL AND PREDICTION STUDY ON THE UPLIFT BEARING CHARACTERISTICS OF ANTI-FLOATING ANCHOR RODS OF REINFORCED STEEL BARS IN WATER-RICH DEEP FOUNDATION PITS

本研究通过优化锚杆截面和注浆方式,提升承载力,改善施工质量,并进行现场测试以验证其抗拔承载力效果。结果表明,增大锚杆与固结材料之间的接触面积提高了粘结强度,同时锚杆的位移受所处土层极限粘聚力影响,表现出不同的抗拔能力。此外,研究还发现传统的极限平衡理论预测值与实测值相差较大,准确度仅为46.4%~49.16%,无法有效反映非线性的位移变化特征。通过多项式拟合分析,3次多项式模型显著优于二次多项式,能够更准确地反映抗浮锚杆上拔荷载与位移间的关系,可为抗浮锚杆的设计和应用提供理论和技术支持。

In this paper,the bearing capacity and construction quality of the bolt are improved by optimizing the bolt cross-section and grouting method,and the field test is carried out to verify the uplift bearing capacity.The results show that increasing the contact area between the bolt and the consolidated material improves the bond strength,and the displacement of the bolt is affected by the ultimate cohesion of the soil layer,showing different uplift resistance.In addition,it is found that the predicted value of the traditional limit equilibrium theory is quite different from the measured value,and the accuracy is only 46.4%to 49.16%,which cannot effectively reflect the nonlinear displacement change characteristics.Through polynomial fitting analysis,the cubic polynomial model is significantly better than the quadratic polynomial,which can more accurately reflect the relationship between the uplift load and displacement of the anti-floating anchor.In summary,this study provides theoretical and technical support for the design and application of anti-floating anchors.