Research On The Deformation And Failure Mechanism And Design Of Engineering Management Along Malu Of Qingchuan Eagle Rock 1# Landslide

Landslide is a major multiple geographical hazard, which spreads all over the world and does a great damage. It not only damages human's life but also does destructiveness to people's property,environment and resources. Landslide happens a lot in our country and will augment in a long time. So it is emergency to enhance the study of landslide hazard and work of prevention and cure. Malu of Qingchuan eagle rock 1# landslide is the earthiness landslide, which develops in the bedrock mountain area, with three-level slip plane. As for part of the landslide deformed and glided, it threats the safety of nearby inhabitants and blocks the way. The essay is based on the detailed geographical mapping,proving locus in quo and pre-research result and analysed the character of eagle rock 1# landslide accumulation,cause and mechanism in detail. It begins with the geographical environment-poietic and deformation character. We discussed the inner factors of slope formation. Meanwhile, the essay used the method of limit equilibrium assay and 3D numerical value simulation analogy procedure to do profound research to the stability of deformation and slide of the third grade slip plane. We make the optimized design to the management of the landslide and obtain the following major research result:(1) Through the analysis of the geographical exploration data and locus in quo investigation result, we know that eagle rock 1# slide is part of the rejuvenation of eagle rock slide accumulation which creep and deform under the effect of the rainfall, and the slip plane is not completely holing-through, accompanying three creep and deformation belt(plane); Now the third grade slip plane of landslide mass is under the process of rejuvenation and creep, which will creep fast, leading to the futher deformation and failure of landslide accumulation when meet strong rainfall or long term rainfall.(2) To utilize the FLAC3D progam to perform numerical simulation, it indicates that now the entirety of eagle rock 1# landslide is in the creep and slide state in natural condition, part of the sliding mass show destabilizing. The deformation is mainly located in the third grade slip plane while there is no deformation in latent the fist and the second slip plane. While calculate the result to compare the on the spot investigation with geographical analyses we know that the analysis result is primarily concordant,which indicates that the calculation model and parameter setting of eagle rock 1# landslide is reasonable.(3) Through the analysis of slip plane in landslide zone, especially the study of three-level slip plane, to evaluate the possibility of producing debris flow by the gully erosion to the landslide lateral and the landslide stability under the condition of the earthquake and hard rain, taking stability calculation with transfer coefficient method, and assess stability of landslide. On this basis, the essay aim directly at the feature of the landslide and introduced effective measure of"Setup drainage system+ retaining wall + check dam"to cure the landslide. The enforcement of the scheme dramatically raises the stability of the third grade sliding mass, does benefits to the entire stability of landslide and cure landslide in a certain degree.(4) To take comparison between actual geological analysis result and numerical simulation analysis result of the landslide, it indicates that the analysis result is primarily concordant, also the location of slip surface is completely concordant with the location that is reflected in the geographical data analysis chapter, which proves that numerical simulation analysis and geographical analysis is feasible and is basically fit for engineering practice.