丹巴县城后山滑坡锚固动态优化设计和信息化施工

DYNAMICAL OPTIMAL ANCHORING DESIGN AND INFORMATION CONSTRUCTION OF DANBA LANDSLIDE

四川省丹巴县城后山滑坡总体积约2.2×106m3。滑坡从2004年10月开始出现明显的变形迹象。2005年2月初,坡体变形加剧,最大变形速率达5cm/d,滑坡呈现出整体下滑的态势。滑坡一旦失稳,将摧毁大半个丹巴县城。相关部门迅速组织实施了以锚固工程为主的滑坡应急治理和综合治理工程。针对该滑坡,介绍其应急治理和综合治理工程,着重研究如何通过各种监测资料,深入分析滑坡的形成机制和稳定性,并以此为主要依据指导锚固工程设计和施工。研究结果表明,利用地表位移、深部位移和锚索张拉应力等监测资料,不仅可以对锚固工程的效果进行分析评价,而且可以根据各阶段监测资料及时调整设计和施工方案,真正做到动态优化设计和信息化施工,充分说明监测在滑坡治理工程中所起的重要作用。

The Danba landslide is located on the rear of Danba town in Sichuan Province. The total volume is about 2.2×106 m3. The speed of deformation became obvious in October 2004,and accelerated in February 2005 with the maximum value reaching 5 cm per day and the landslide tending to slide entirely. If the whole landslide moved down,more than half of the Danba town would be destroyed. The related agencies organized the emergency aid and comprehensive remedial projects as soon as possible. The attention was paid to how to make good use of the monitoring data to analyze the genetic mechanism and the stability of the landslide,and to guide the design and construction of the prestressed anchoring work. The study shows that,by making use of the observed data of the surface displacement,the displacement in depth and the tension of anchor cables,not only the anchoring effect of cables can be evaluated,but also the design and construction options can be adjusted in time,which indicates that the monitoring plays a very important role in landslide treatment.