三峡库区树坪滑坡应急治理工程效果分析

Analysis on effect of emergency treatment project of Shuping Landslide in Three Gorges Reservoir Area

针对后缘较陡的大型滑坡的应急治理问题,选取三峡库区树坪滑坡应急治理工程为对象,以防灾减灾为目标,采用实时动态监测数据结合数值模拟的方法,分析此次治理的效果,并对该应急治理工程采取的组合治理方式进行模拟分析及评价。结果表明:通过对滑坡进行削坡压脚来减小滑坡自重,降低滑坡整体的下滑力,增加滑坡整体抗滑能力;滑坡表面设置的排水沟渠,能够减弱地表水入渗,间接增强抗剪强度,抑制滑坡的变形;该滑坡在应急治理后,应力场发生改变,变形速率显著降低,退水期间滑坡位移的突变特征消失,变形趋势逐渐减缓,滑坡稳定性有一定的提升。研究成果验证了应急治理措施对于体积较大、后缘较陡的滑坡治理的有效性,可为滑坡的治理提供有效的经验与方法。

Aiming at the emergency treatment of large-scale landslide with steep back-edge,the emergency treatment project of Shuping Landslide in the three Gorges Reservoir Area is taken as the study object,and then the effect of this treatment is analyzed with the method of the real-time dynamic monitoring data combined with numerical simulation by taking disaster prevention and reduction as the target,while the combined treatment mode adopted for this emergency treatment project are simulatively analyzed and evaluated as well.The result shows that through slop-cutting and toe backfilling for reducing the self-weight of the landslide body,lowering the integral downward slipping force of the landslide body as well as arranging drain-ditch on the surface of the landslide body,the surface water infiltration can be weakened,while the deformation of the landslide body can be restricted as well.After the emergency treatment of the landslide,the stress field therein is changed,the deformation rate is significantlylowered and the mutation characteristics of the displacement of the landslide disappears during the period of recession,thus thedeformation trend is gradually alleviated and the stability of the landslide body is enhanced to a certain extent.The study resultdemonstrates that the emergency treatment measures for the treatment of the landslide with large volume and steep back-edge areeffective,which can provide effective experience and method for control of landslide.