常见边坡支护形式的地震稳定性对比分析

为了对比分析抗滑桩、抗滑桩加预应力锚索、格构梁加预应力锚索这3种边坡支护形式的地震稳定性,建立了相应的数值模型进行计算分析。计算结果显示:3种支护形式在地震作用后,边坡变形及稳定性系数的衰减幅度基本一致,其中格构梁加预应力锚索的衰减程度略弱,从结构受力放大倍数来看,抗滑桩支护形式的结构受力放大程度明显高于其余2种支护形式。计算结果还显示预应力锚索不仅能够提高边坡的稳定性,而且能够抑制支护结构内力的放大,从而提高支护结构的安全性能。

Comparative Analysis of Seismic Stability on a Common Slope Support Form

To perform a comparative analysis of seismic stability on a common slope support form, the corresponding numerical model for the following was established: a comparative analysis pile, a pile with pre-stressed anchor, and lattice beams with pre-stressed anchor. The seismic stabilities of these three kinds of support form were then calculated. The results show that, after the earthquake, the three kinds of support form are basically the same, along with the amplitude attenuation coefficient of slope stability and deformation, although the attenuation of lattice beams with pre-stressed anchor was slightly weaker. From the magnification of the force structure perspective, the force amplification level of the anti-slide pile was significantly higher than those of the two other kinds of support form. Furthermore, the pre-stressed anchor not only improved slope stability, the supporting structure can also enlarge the internal force, thereby enhancing the safety performance of the support structure. These conclusions can provide references for the choice of slope support form in the earthquake zone.