【摘要】 预应力锚杆已被广泛应用于基坑、隧道等地下工程,拉力集中型预应力锚杆也以其独特优势而备受青睐。但是,对于其锚固机理、承载机制的认识相对滞后。采用FLAC3D有限元软件,通过分析土层和施工参数,对锚杆承载力、预应力损失等问题进行研究。结果表明:锚杆自由段长度增加,锚固段的平均摩阻力得到显著提高,而锚杆的承载力随着锚固段长度的增加而提高,锚杆锚固段平均摩阻力却一直在减小,说明锚固段的利用率下降。更多还原

【Abstract】 Prestressed anchor has been widely used in underground engineering,such as foundation excavation,tunnel and so on. Concentrated tension prestressed anchor with its unique advantages favored. However, for the lagging understanding of the anchoring mechanism and the bearing mechanism,it needs to be improved. In this paper,through analysis of the soil and construction parameters,to research on the problems such as the bearing capacity of anchor,prestress loss. And the results show that with the increase of bolt free length,the anchoring section of average frictional resistance improved significantly. The bearing capacity of the anchor rod increased with the increase of anchorage length,but the anchoring section of average frictional resistance is decreasing,which suggests that the utilization rate of the anchoring declines.更多还原