不同开挖形式下边坡应力和稳定性有限元分析

Finite Element Simulation Analysis of Slope Stress and Stability in Different Excavation Schemes

工程中边坡开挖广泛存在,研究开挖形式对边坡稳定性影响具有一定的工程意义。进而通过有限元计算对开挖边坡的稳定性进行分析,并布置应力监测点查明开挖卸荷对边坡应力的扰动情况。结果表明:自然边坡在进行开挖施工中,坡脚处将出现应力集中的现象,并且会随着开挖厚度的加深进而更加明显;开挖卸荷对边坡的扰动状况会随着(在开挖水平面以上)垂直方向距离的加大进而增加;水平开挖相比竖直开挖和坡向开挖两种形式下的边坡稳定性系数更大。在实际工程施工中,可以采取竖直方向进行开挖施工,能够更好的保证边坡的稳定。

The slope excavation has been widely used in engineering and researching the influence of excavation on the stability of slope is an engineering significance. This paper analyzed the stability of excavated slope by finite element methodand arranged the stress mo- nitoring point to find out the disturbance of excavation unloading to slope stress. The results showed that the stress concentration would occur at slope toein natural slope excavation and it would be more obvious with excavating deeper. The disturbanee of excavation unloa- ding would increase as the vertical distance（ above the excavation level） increased. The slope stability coefficient of horizontal excavation was higher than vertical excavation. In the actual construction, the vertical direction excavation could be used, which was better to en- sure the slope stability.