建设期路堑高边坡地震稳定性评价方法及应用

Evaluation Method and Application of Seismic Stability of High Cutting Slope During Construction Period

路堑边坡除了在完成支护措施后需要满足工程稳定性要求以外,在建设过程中也不能发生大的失稳变形破坏。为了综合评价建设期路堑高边坡修筑过程的稳定性,提出一种地震稳定性综合评价方法,分别分析整个施工过程中边坡的动力稳定性、塑性变形和框格梁破坏,并对典型边坡案例的实际施工次序和推荐施工次序进行了计算。结果表明“一坡到底”的施工方法在高烈度区更容易受到地震影响,发生大的滑动可能性显著增加。而采用“开挖一级,加固一级”的方法发生滑动概率更小,框格梁的完整性能得到较好的保存。能为建设期路堑高边坡地震稳定性评价提供重要的指导意义。

In addition to meeting the engineering stability requirements after the completion of support measures,the cutting slope also needs to be free from large instability deformation and failure during the construction process.In order to comprehensively evaluate the stability of high cutting slope during construction,a comprehensive evaluation method of seismic stability is proposed in this paper.The dynamic stability,plastic deformation and frame beam damage of the slope during the whole construction process are analyzed respectively,and the actual construction sequence and recommended construction sequence of typical slope cases are calculated.The results show that the construction method of“one slope to the bottom”is more susceptible to earthquake in high intensity areas,and the possibility of large sliding increases significantly.However,the method of“one stage excavation and one stage reinforcement”has a lower probability of sliding,and the integrity of the frame beam is better preserved.This method can provide important guiding significance for the seismic stability evaluation of high cutting slope during the construction period.