Field Measurement and Numerical Simulation Analysis of High and Steep Slope Reinforced by Prestressed Anchor

摘要

In order to study the development of the displacement and the axial force of the anchor during the excavation and support of the high and steep slope reinforced by the prestressed anchor, the high and steep slope project of Shimen Mountain in Dalian was taken as the background. The displacement response and the change of anchor axial force were studied by field measurement and numerical simulation during the slope excavation, and the influence of the anchor parameters on slope stability was analyzed. The results show that it is possible to infer the unstable position of slope according to the displacement response of slope and the stress of anchor determined by the continuous monitoring data, which can provide reference for the design and construction of slope engineering. The displacement response and the change of the internal force got by numerical simulation are consistent with the measured results, which shows the numerical simulation method can predict the deformation of slope and the axial force of anchor well. As important parameters of prestressed anchor, prestress, and anchor spacing have great influence on the stability of slope. Both increasing prestress value and reducing anchor spacing can limit the displacement and increase the stability of slope effectively, but the influence will be less obvious if exceed the limit value. Different excavation and support methods have significant effect on the safety and stability of the slope. The layered excavation method behaved better than the excavation method of one slope to the end in limiting the displacement of the slope, which is more conducive to ensuring the safety and stability of slope.