Based on the Jiangdingya landslide in Zhouqu County,the basic characteristics of landslide de-formation were obtained by means of field investigation,engineering geological drilling exploration,global navigation satellite system displacement monitoring,multi-stage image comparison of unmanned aerial vehicle,and comparative analysis of deformation history and a numerical simulation of mass flow.The reactivation mechanism and deformation mode of the landslide were analyzed,and its development trend and damage range reproduced.The research showed that the Jiangdingya landslide was mainly in-duced by rainfall,whose infiltration formed a saturated zone at the sliding zone,softening and invading the lubricating surface,and resulting in a continuous decrease of the shear strength of the carbonaceous slate in the sliding zone and inducing landslide instability.The"annular"gray-black carbonaceous slate appeared on the back wall and side wall of the landslide after cracking and sliding,depressions and plat-forms were formed in the middle,multiple bulging and tensile cracks and shear cracks appeared in the middle and front,and multiple radial cracks were formed in the front.The sliding body squeezed the Bail-ong River channel,resulting in a local channel of less than 5 m;the sliding of the front body of the Ji-angdingya landslide led to a loss of support of the rear sliding body,and the weight force of the rear slid-ing body led to a local resurrection.The deformation mode was a composite failure of the front trac-tion-backward displacement.Through the numerical simulation,it was found that,under unfavorable con-ditions,the landslide accumulation body would block the Bailong River,forming an 18 m thick barrier body and a 6.6 km backwater submerged area in the upstream,which posed a serious threat to the up-stream villages such as Nanyu,Hujiaya and Anziping,with a great potential harm.
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