Analysis Of Combined Structure Of K225 Landslide Treatment In Baoji To Chengdu Railway

In recent years,with the high quality development of the national railway industry,affected by rainfall and geological activities,landslides often occur along the railway,which always affect the safety of driving and personal life.Therefore,it is very important to study and analyze the landslide control methods at the present stage.Based on the example of the Baoji to Chengdu railway K225,this paper compares two different landslide treatment methods at the present stage,and provides some technical reference for landslide treatment in the future.First of all,through the actual investigation and analysis of the Baoji to Chengdu railway K225,this paper mainly puts forward two kinds of landslide control combination structure,one is pile plate wall combination structure,the other is steel pipe pile combination structure.Based on the two combined structures,the numerical simulation model of the two combined structures is established.Secondly,under the self-weight load of the structure,the displacement deformation and equivalent stress of each part of the two combined systems are analyzed.Then,the influence of soil parameters on the displacement and equivalent stress of each component of the two composite structures is studied,and some reasonable suggestions are put forward.Finally,the optimal landslide control scheme is determined from the aspects of the two combined structures themselves,construction conditions,time limit,displacement and equivalent stress.The results of this paper show that,in terms of displacement,the overall displacement of steel tubular pile composite structure is smaller than that of pile plate wall composite structure.The effect of steel pipe pile group is significant in the numerical simulation model.In the steel tubular pile composite structure,the overturning displacement of steel tubular pile composite structure becomes zero due to the existence of anchor cable structure.The overturning displacement of pile slab wall composite structure occurs obviously under the action of load,which has adverse effect on the composite structure itself.In terms of equivalent stress,there is little difference between the equivalent stress values of the steel tubular pile composite structure and the pile plate wall composite structure.The maximum value of the equivalent stress of the steel tubular pile composite structure occurs at the back of the steel tubular pile group,and the equivalent stress of the front is smaller than that of the back,and the equivalent stress of the top surface of the crown beam is smaller.The equivalent stress distribution is larger at the position where the steel tubular pile and the crown beam are connected.The maximum value of the equivalent stress of the pile plate wall composite structure occurs at the bottom of the pile body,which just interacts with the landslide surface of the landslide.The equivalent stress of the retaining plate structure is mainly distributed in the middle of the upper and lower sides of the plate,and the value is small.In addition,under the influence of the change of landslide soil parameters,the equivalent stress changes of the two composite structures are different.On the whole,with the increase of landslide soil parameters,the equivalent stress of each component of the pile-slate-wall composite structure decreases,thus improving the structural bearing capacity.In the aspect of steel pipe pile,with the increase of landslide soil parameters,the equivalent stress of steel pipe pile group gradually increases,and the equivalent stress of anchor cable structure gradually decreases.When the three soil parameters are small and change within a certain range,the equivalent stress of the steel pipe pile group changes greatly.Combined with the analysis of the numerical simulation results,the treatment scheme of Baoji to Chengdu railway K225 was finally determined,that is,the composite structure of steel pipe pile was used to treat the landslide.