Analysis And Calculation Of Landslide Load Reduction Stability Based On Concept Of Influence Line

With the acceleration of urban construction in Loess-land,a large number of artificial excavation projects have changed the state of natural slopes and formed unstable landslides.The potential destructive power of such unstable landslide is huge,if there is no reasonable way to carry out engineering design management,it will seriously affect the speed of urban construction and the normal production order of the people.For this kind of unstable landslide caused by human engineering activities,the rationality,feasibility and economical efficiencyof the control measures will be the key to the management of landslide disaster,the guarantee of the speed of urban construction and the protection of the normal production order.Landslide scaling is one of the most commonly used measuresin many landslide control,and its economic rationality,safety and reliability are the prominent factors used in it.As we all know,the stability of the landslide will change under different Landslide scaling measures.In order to illustrate this change in a more intuitive way,this paper draws on the concept of the influence line in structural mechanics,regard the different cutting position under the equal cutting square quantity as the moving load,regard the stability coefficient correspondto the load reduction position of each cuttingposition as the influence quantity,analyzeand prefer the optimal Landslide scaling method.Taking the unstable loess landslide in Linyou County as the research object,this paper gives six different Landslide scaling methods,and applies the influence line method in structural mechanics to calculate the stability of landslide under the designed Landslide scaling methods on the basis of the topography,geomorphology,hydrogeological characteristics and engineering geological characteristics of the landslide.According to the engineering practice and safety coefficient,the optimum Landslide scaling method is determined.At the same time,the ABAQUS software is used to simulate the displacement and stress distribution under the six Landslide scaling methods,and to analyze the stability of landslide under different cutting schemes.Combine the concept of impact line and the calculation and analysis of ABAQUS software for landslide stability,the corresponding control measures are formulated for the optimal Landslide scaling methods.Based on this engineering example,the main research results of this paper are as follows:(1)The closer the cutting position to the upper part of the landslide,the higher the stability of the landslide,the smaller the landslide thrust at the foot of the landslide slope.The stability of the slope is reduced if we reduce the load in the lower part of the landslide,and the residual sliding thrust at the retaining wall will be increased.The influence is more obvious with the drop-down of position of the cutting position,that is,the closer the cutting position to the foot of the slope,the remaining sliding thrust of the landslide is more larger.(2)Under natural condition and saturation state,the landslide stability coefficient of Landslide scaling method 5 and 6 is greater than the engineering safety factor in the corresponding state.Since the cutting position of the cutting-off scheme 6 is close to the rear edge of the landslide,it iseasy to form a high and steep surface after excavation according to the scheme,which is not conducive to the stability of the landslide as a whole,therefore,the cutting reduction scheme 5 is the best suited method as the cutting and reducing scheme of the landslide.(3)By the finite element simulation analysis of landslide byABAQUS,the strain and stress distribution map under the six Landslide scaling methods are get.From these maps,Landslide scaling method 5 have the lowest and most uniform strain and stress distribution,and no new high,steep,slippery and collapsible surface will be produced.Therefore,the Landslide scaling method 5 has the least possibility of sliding and collapsing and is the most stable method in the process of landslide excavation.The strain and stress finite element simulation analysis by ABAQUS software shows that it is most suitable to select the Landslide scaling method 5 as the cutting and unloading scheme.The results are consistent with the analysis results of the application of the influence line concept,which shows that the conclusion of this paper is true and credible,and has certain engineering and application value.