Study On The Effect Of Arch-Shaped Anti-Skid Structure In V-Valley Landslide And Its Application

V-type landslides are prevalent in mountainous areas of our country.These landslides are slippery and wide with high slippage at the foot of the slope,large sliding angle and sliding force,and the rock and soil on both sides of landslide is more stable also.The traditional anti-slide retaining structure is not suitable for the treatment of V-type landslides for that it can not make full use of the favorable geological conditions on both sides of the landslide,and its structure arrangement is not design from the perspective of structural stress optimization.The traditional anti-slide retaining structure also has some disadvantages such as poor integrity,poor economy and difficult construction also.To solve the above problems,a kind of arch arrangement anti slide pile and coupling beam supporting structure to control this kind of landslide slide is proposed.The structure can utilize geological conditions of landslide to optimize the structural stress and deformation characteristics of the landslide,so as to improve the economic rationality of the retaining structure.Based on the characteristics of V-type Valley landslide,the FDM software FLAC3D was used to study the mechanical and deformation characteristics of the anti-sliding arch structure,the following works has been done:(1)Because the FLAC30 can only extract the stress of the unit body,and can not extract the internal force directly,re-development has been carried out,and the extraction of the internal force of the solid beam element is realized using the built-in FISH language of the FLAC30.The bending moment of the cantilever beam is solved by the five point stress method and the element beam element(beam element)of FLAC3D.The correctness of the calculation formula is verified.(2)The impact of the change of span ratio,elastic modulus of pile wall,constraint condition of pile bottom,V-angle and other factors on the internal force and deformation of arch arrangement anti slide pile and coupling beam supporting structure is analyzed.Research shows that the anti slide structure arch,with continuous beam axial force,bending moment,and can significantly reduce the various anti slide pile bending moment,and that not only to give full play to the compression performance of concrete anti slide structure arch,and can get the anti slide force distribution is more uniform and reasonable arch structure.On this basis,the design proposal of this kind of arch anti slide structure is given.(3)The design and calculation of landslide control in northeast corner of two regulation building of Zhangjiajie Discipline Inspection Commission,which has V Valley characteristic,is carried out by using commercial software and through the FLAC3D software for computational results and the results were analyzed according to the calculation of space and plane problems,The safety of arch anti slide structure is explained.The design results are applied to practice and good results are achieved.