Study On The Stabilization Of Accumulated Landslides Under Folded Sliding Mode

Accumulation landslides is the most widely distributed of the landslide geological disasters,and the curve of sliding mode is one kind of the basic sliding mode of accumulation landslides.Imbalance thrust force method(ITFM)is originally developed approach for slope stability analysis in China,which has been widely used in the field of landslide stability analysis.The ITFM is simple in computation,and not only can obtain that shear stress of soil stripe,the landslide thrust is of non-circular slip surface under complicated load condition,also stability coefficient,without any iterative computation,it is generally suitable for simple engineering projects.ITFM has shortcomings as with many other methods,which is applicable to only slope slide completely,make the safety factor larger than the actual and the landslide thrust force smaller.Therefore,in order to study the stabilization of deforming landslide under folded sliding mode,taking a landslide project as an object of study and analyze the stability,stress-strain relationship of slopes under different operating conditions,which based on the basic theory of limit equilibrium theory and SRFEM.The main results of this paper are as follows:(1)Improved the condition of the unbalanced thrust method.The method also considers the peak shear strength and residual shear strength of the slope,the value is determined by the steady state of the slider,not definite value.When Fi(29)1,take the i ic ??(peak shear strength)peak anti-reduction strength,on the contrary Fi(27)1,take the ci cic ??(residual shear strength).(2)According to the investigation data,obtain that sliding mode of the landslide in Xinhuang is medium-traction-type landslide.The sliding mechanism of landslide formation is considered that the strong rainfall is the incentive,the terrain condition(in the valley slope)and stratum conditions(loose soil,bedrock surface crushing)is the internal cause,human engineering activities is external,such as the destruction of vegetation and slope foot excavation.(3)The ABAQUS software is used to simulate the stability of the landslide under the self-weight condition.The calculated plastic zone is basically consistent with the measured slip surface,and the sliding surface is determined as the geologic interface.(4)The results show that the traditional value method has a large difference between the peak value and the residual strength when the value is the difference between the peak value and the residual strength.Which is 28.6% ~ 43.4%,but the latter is close to that of the improved method.The difference is only 2.58% ~ 17.5%.The improved value method is used to consider the attenuation of the rock and soil strength during the process of deformation and failure.Subtraction is similar,the results are more reliable than traditional methods,close to engineering practice.(5)According to the improved value of the method of landslide thrust design of anti-slide pile steel consumption compared to the traditional value method can be reduced by about 11.5%.The method of landslide treatment of prestressed anchor cable anti-slide pile and anchor box girder beam is put forward.This method can effectively block the development of landslide plastic zone and control the deformation of slope body,and meet the requirements.