Analysis Of Lateral Failure Pattern Of Two-stage Slope Based On Geotextile Bags Support

The territory of our country is vast and the slope engineering is widely distributed.Disasters caused by slope landslides have seriously affected people’s lives.Retaining wall has the advantages of advanced technology,simple construction and reasonable economy,but there are also shortcomings,such as more materials,longer construction period and consumption of natural resources.In order to meet the requirements of the low-carbon era and uphold the concept of sustainable development,geotextile bags support structure emerged as the times require and is widely used in many engineering fields,such as terrace support,foundation reinforcement,mine greening,river embankment masonry and so on.In this paper,through the lateral non-uniform loading model box designed and developed by the research group,the two-stage slope of loess is selected as the research object.Simulating the lateral driving effect of upper landslide on lower slope in reality.The vertical displacement of the top of the slope,the horizontal displacement of the slope and the change of the earth pressure behind the wall of the two-stage slope with three supporting methods and three slope ratios are measured,and the lateral failure pattern is analyzed and the bearing capacity is evaluated.At the same time,ABAQUS finite element software is used to analyze the lateral deformation and plastic zone of secondary slope supported by Inclined type,L-shaped,L-shaped with Notched Sill geotextile bags.The main conclusions are as follows:(1)In view of the shortcomings of the current slope model test equipment,a new loading mode of model box is proposed in this paper.The lateral non-uniform loading mode realizes the characteristics of large displacement of the upper part and small displacement of the lower part in the process of slope deformation,and simulates the actual deformation characteristics of the slope more truthfully.(2)With the lateral push displacement of the top of the slope,the cracks of the two-stage slope gradually extend and widen,and eventually destroy.L-shaped with Notched Sill geotextile bags supporting slope can bear larger lateral displacement,and the degree of lateral deformation and damage is the smallest,so the bearing capacity is the best,the second is L-shaped,and the Inclined type slope has the lowest bearing capacity.(3)Under different slope ratios,the larger the slope ratio,the smaller the lateral push displacement and the larger the lateral deformation of the two-stage slope when the Inclined type geotextile bags is used to support it The slope with slope ratio of 1:0.75 has the best bearing capacity under the support of Inclined type geotextile bags,followed by the slope with slope ratio of 1:0.5,and the slope with slope ratio of 1:0.3 has the lowest bearing capacity.(4)The soil pressure cell located near the through crack is affected by the crack blocking effect.The crack hinders the transmission of earth pressure and causes the decrease of earth pressure.(5)Under lateral non-uniform loading,the secondary slope is destroyed before the first slope and the destroyed degree was greater than the first one.Cracks occur and extend from the foot of the slope and 1/3 to 1/2 of the foot of the slope.With the increase of slope ratio,the two-stage slope changes from sliding failure to dumping failure,and the sliding surface or through crack changes from circular arc to broken line.