舟曲泄流坡滑坡变形特征及其形成机理

以甘肃舟曲泄流坡滑坡的野外详细调查和变形监测资料为基础,探讨泄流坡滑坡蠕滑变形特征和形成机理。研究表明,舟曲泄流坡滑坡发育于坪定—化马断裂内,属典型的巨型断裂带滑坡。该滑坡由多个次级滑坡组成,表现为蠕滑变形特点,且一直处于不稳定状态。该滑坡是在内外动力耦合作用下形成的,断裂破碎带是泄流坡滑坡发生的充分条件,断裂活动导致坡体发生塑性流动变形;而降雨是滑坡发生大规模下滑的主要诱发因素;地震、坡脚开挖等对滑坡的发展、演化起到促进作用。因此,进一步研究断裂带滑坡的形成机理和成灾模式,对此类滑坡的防治预警有重要意义。

DEFORMATION CHARACTERISTICS AND FORMATION MECHANISM OF XIELIUPO LANDSLIDE IN ZHOUQU

Based on detailed filed survey and deformation monitoring data for many years, deformation characteristics and formation mechanism of Xieliupo landslide in Zhouqu has been discussed. The result reveal that the landslide which lies in Pingding-Huama Fault Zone belong to a typical giant fault zone landslide being in an unstable state all the time.Xieliupo landslide is formed under the coupling of endogenic and exogenic geological processes.Shattered fault zone is a sufficient condition which resulted in Xieliupo landslide and fault activities lead the slope to plastic flow deformation.Rainfall is a main factor which triggering large-scale slip of the landslide.Furthermore,earthquake,toe cutting and other factors play promoting roles in the landslide''s development and evolution.Therefore,further studies on the formation mechanism and disaster pattern of fault zone landslide have important significance towards the prediction and prevention of this type of landslide.