单层注浆锚杆锚拉式挡土墙锚杆轴力分布规律研究

Research on Anchor Bolt Axial Force Distribution of Single Layer Grouting Anchor Bolt Anchor Tie Retaining Wall

注浆锚杆轴力的确定是锚拉式挡土墙设计的关键步骤,目前大多依靠经验公式进行确定,其设计的合理性及安全度不能有效保证。结合青临高速锚拉重力式挡土墙的工程实例,设计制作了室内模型试验,并结合ABAQUS有限元软件数值分析结果,分析了锚杆轴力的分布规律。现场试验结果表明,锚杆近墙端拉力较大,远墙端拉力较小,锚杆轴力由近墙端至远墙端逐渐减小,且整体上随着填土高度的增大而增大,这与数值模拟结果规律比较吻合,该结论为锚拉式挡土墙设计计算提供了理论依据。

The confirmation of anchor bolt axial force of grouting anchor bolt is a critical process of anchor tie retaining wall design. Currently,it is mostly confirmed by empirical formula,which can not effectively guarantee the rationality and safety of the design. Combining with the practical engineering of Qing- Lin expressway anchor tie gravity retaining wall,laboratory model test has been designed and implemented; and combining with the numerical analysis result of ABAQUS finite element software,anchor bolt axial force distribution law has been analyzed. The result of the on- site test shows that the tensile force of far- end of the wall is smaller while the tensile force of near- end of the wall is larger; the anchor bolt axial force declines from near- end of the wall to far- end of the wall while growing with the height of filling which is generally consistent with the law of numerical simulation results. This conclusion provided theoretical reference for anchor tie retaining wall.