考虑边坡开挖中地应力释放的改进Sarma法

Improved Sarma Method with Considering the Release of Earth Stress during Slope Excavation

边坡的开挖通常伴随着原始地应力的释放,对高地应力区的人工开挖边坡而言,地应力的释放强度高、速度快,对边坡稳定性的影响往往是不利的。但是目前用于分析岩质边坡稳定性的Sarma法却没有很好地考虑岩质边坡开挖过程中地应力释放对边坡稳定性的影响,这是偏于不安全的。在传统的Sarma法的基础上,引入了地应力释放荷载,对Sarma法进行了改进,考虑了边坡开挖过程中地应力释放对边坡稳定性的影响,并用算例进行了说明。该改进的Sarma法能够较好地应用于高地应力地区人工开挖岩质边坡的稳定性分析。

The excavation of slopes is generally associated with the release of ground stress. As far as the excavated slopes is concerned, the release of ground stress is characterized by high intensity and high speed, so it may do harm to the stability of the slopes. However, this disadvantage regarding the release of ground stress during the excavation of slope has not been considered in the conventional Sarma method which is widely used to analyse the stability of slopes. On the basis of conventional Sarma method, the ground stress release loads are introduced into the conventional Sarma method to consider the fact that the release of ground stress may be adverse to the stability of the slope during the process of excavation. An example is used to explain the proce- dure of the improved Sarma method. This improved Sarma method can be applied to analyse the stability of the excavated rock slope with high ground stress.