基于固有振动频率的滑坡安全评价新方法

A new method for landslide safety assessments based on natural vibration frequency

运用模型实验,在保持下滑力不变的情况下,通过固有振动频率对滑坡内部的黏结力、摩擦力等抗滑力指标进行分析.通过在弱稳定阶段中实际静摩擦力是否达到最大静摩擦力的方法,科学地判识滑体的稳定情况.结果表明:计算的摩擦力可以有效分析滑坡在弱稳定阶段期间的安全性,并证明固有振动频率监测比位移监测更加敏感.同时,固有振动频率的监测可对滑坡损伤做出定量判断,并可以评估滑坡静摩擦力指标,从而实现扰动后滑坡的安全评价.

Using model experiment, in the condition that the sliding force unchanged, the internal cohesive force and friction force of the slope were analyzed by the natural vibration frequency. The stabilization of landslides was decided by comparing the friction force with the maximum static friction force in the weak stable phase. Experimental results show that the friction force can effectively analyze the safety of landslides in the weak stable phase and that the natural vibration frequency is more sensitive than the displacement. By monitoring the natural vibration frequency, a quantitative assessment about the damage of landslides can be made, which provide the static friction force index, and the safety assessment of landslides after disturbances is achieved.