岩质高边坡开挖应力与蠕变稳定性研究

以某公路岩体边坡工程为例，建立有限元分析模型；根据前期边坡变形监测资料，反演边坡岩体物理力学计算参数，分析边坡开挖后各阶段边坡应力变形规律，结果显示边坡七级开挖后应力变化均在允许范围内，能满足强度要求。为了研究岩体随时间变化的长期稳定性，进一步考虑蠕变特性，推定岩石流变参数，分析边坡蠕变变形规律，评价和预测边坡的稳定安全性。结果表明，在2011年1月前，边坡岩体处于开挖卸载后的非稳态蠕变阶段，之后进入稳态蠕变阶段，岩体位移基本趋于稳定。其中二级平台的测点位3的X向位移变化最大，在2010年5月期间发生急速增长至26mm，对边坡稳定不利。该结果不仅可以为工程施工提供科学的理论依据，而且对边坡加固措施以及滑坡的预测预报也具有重要的指导作用。

The excavation stress and creep stability of rock high slope

In this paper,a rock slope of an expressway is taken as an example and a finite element model has been established.According to the deformation observation data of the slope,the physical-mechanical parameters are analyzed inversely,and the stress change of the slope during each stage period are analyzed.The results show that the slope after excavation all the stress changes within permission can meet the required strength.In order to study the stability of the slope in the long term,creep characteristics are further considered,The creep parameters of rock masses are deduced,and the creep deformation changes of the slope during each stage period are analyzed.And the stability of slope is evaluated and predicted.It is shown that the creep deformation of the upper of parts slope is smaller than the lower parts of that.Before January 2011,the rock slope was unsteady after being excavated and unloaded,and then it became steady,the rock displacement will keep stable.The point 3-X axis of second platform has a biggest displacement change,more displacement has rapidly increased to 26mm in May,2010,and it was adverse to slope stability.The results not only provide a scientific basis for the project construction,but also play an important guiding role in the slope reinforcement measures and landslide forecasting.