喻家土扁滑坡形成的力学机理与险情分析

喻家滑坡发现于去年5月,体积近17×104m3,呈长条纺棰状,分成上.下滑块,本文从斜坡的变形历史、特征调查入手,较深入地研究了该滑坡滑移-拉裂-推动-牵引的耦合力学机理,该滑坡正处在蠕滑阶段,近期存在整体滑移和出现较大危害的险情,已引起有关部门的重视,并采取了有力的减灾防灾措施.

Formation mechanism and risk analysis of Yujiabian landslide

Yujiabian landslide is located at Rongshan Town,Guangyuan City,Sichuan Province.It takes a spindle shape with a volume of 17×104m2.The slope where the landslide developed averages a gradient of 16°and is paralelled to the river bank.The slip surface is developed along the interface of the strongly eroded masses and the carboniferous rock layers,and its slip body consists of gravelled clay.First symptom of the slope's deformation came in september,1998 when the rearward buildings No.46 & No.47 were distorted into fissures on the walls and the ground.In the mid-March of 1999,after days of rainfall,both the displacement was worsened in the rear and the crack formation extended to the middle and the fornt of slope.According to in situsurveys,the occurrence of the landslide must be mechanical interaction of tension,pushing,and drawing.Its development could be divided into three phases of tension movement,stress transmission,and integrated failure,and the second phase is it in.The tendency from current mechanical analysis would be the deformation by kinetic pushing from the upper slip block or that by drawing from the lower one.The result more likely to occur would be the first situation.