地基SAR监测的人工堆积体降雨型滑坡变形失稳分析

Deformation and instability analysis of rainfall induced landslides in artificial accumulations monitored by ground-based SAR

为了研究人工堆积松散体在降雨诱发下的变形特征,在某排土场边坡架设地基合成孔径雷达(SAR)开展全天候长期监测,基于大量监测数据分析松散堆积体的面域位移场特征,通过分析重点监测区域的时间空间演变研究人工堆积体边坡在雷达监测的失稳特点,研究结果表明:地基SAR能够获取更全面的边坡表面位移数据,帮助掌握边坡的整体变形特征,雷达全天候的长期监测数据可以一定程度上反映降雨等各种因素对边坡变形的影响;降雨通过渗透溶蚀作用降低边坡稳定性,从而引起雷达视场中边坡表面位移变化,区域月降雨量与边坡局部变形速率而不是变形量存在正相关关系。

In order to study the deformation characteristics of artificially stacked loose materials under rainfall induction,a foundation Synthetic Aperture Radar(SAR)was installed on the slope of a certain waste dump for all-weather long-term monitoring.Based on a large amount of monitoring data,the displacement field characteristics of the loose pile were analyzed.The instability characteristics of the artificial pile slope under radar monitoring were studied by analyzing the temporal and spatial evolution of key monitoring areas.The research results showed that the foundation SAR can obtain more comprehensive slope surface displacement data,help to grasp the overall deformation characteristics of the slope,and the all-weather long-term monitoring data of the radar can reflect to some extent the influence of various factors such as rainfall on slope deformation;Rainfall reduces slope stability through infiltration and dissolution,causing surface displacement changes on the slope in the radar field of view.There is a positive correlation between regional monthly rainfall and the local deformation rate of the slope,rather than the deformation amount.