基于变形响应率的路堑边坡失稳预报研究

岩土体的变形可以视为广义荷载作用下的响应,在布置了大量位移观测仪器的边坡上选择变形稳定的测点为参考点,将参考点的位移变化视为荷载变化过程。计算出边坡其余部位的测点相对于参考点的变形响应率,通过响应率的变化趋势来判断边坡不同部位的稳定状况。当响应率较小时,说明变形正常;若某测点的响应率突然增加,说明该位置很有可能发生局部失稳破坏。通过对某高速公路沿线路堑高边坡的实例研究表明,变形响应率的波动情况与边坡实际状态的变化基本一致,响应率大的部位发生了塌滑。

Collapse Forecasting of Cut Slope Based on Deformation Response Ratio

The deformation of soil mass can be regarded as the response under generalized load.The monitoring point in stable state on cut slope equipped with large amount of displacement surveying apparatuses was chosen as reference point,and the deformation of reference point reflects the change of load.By comparing the displacement change of other monitoring points with the reference point,the deformation response ration was obtained to determine the stable status of different cut slope positions.The result shows that(1) when the response ration is small,the position of slope is in normal state;(2) when the response ration fluctuates intensely,local collapse may occur.The research of cut slope of an expressway indicates that the change of deformation response ratio is in concordance with the actual stability of slope and the local collapse happens on position where the response ratio is abnormal.