The Stability Evaluation And Research On Control Technique Of Cut To Fill Subgrade Embankment

Since the reform and opening up,the economy of China develops rapidly,and rapid economic development greatly stimulated the construction of the highway.At present,the scale and speed of highway construction in China are in a fairly rapid development stage.With the increasing demand of people's travel and economic development,people's requirement for highway is no longer simply to reach the destination,gradually changed to require more rapid traffic conditions,safety,comfort,economic and environmental protection.As all we know,China is a mountainous country,so the construction of mountain highway becomes particularly important.Because the terrain of Mountain is complex and varied,not only the shortage of earth and its transport is extremely inconvenient,so the mountain highway subgrade half-fill half-filled form.Semi-filled half-cut subgrade not only solves the shortage of roadbed earth and the problem of inconvenient transportation,but also plays a very positive role on ecological protection.However,due to the great differences in the nature of the Embankment and Excavation,the roadbed will have many problems during the filling process and after the opening of the Embankment.Especially,the uneven settlement caused by different nature of the Fill and Excavation engineering problem.Therefore,it is very necessary to study the stability of the Embankment at the Boundary of the Filling and Digging,and the control should be controlled in the early time to ensure the safety,durability and comfort of the highway.Relying on Fengning section roadbed engineering of Zhangcheng highway,this paper mainly carried out the following work:(1)According to Filling and Digging boundary factors such as different structure forms and packing types,the embankment is classified,and analyze the mechanism of instability of the Filling and Digging boundary embankment and the corresponding disease characteristics.(2)Combining with the related literatures,this paper summarizes the traditional methods of stability evaluation(Swedish slice method,Bishop method,etc.)and the original unbalanced thrust method in our country,and compares them with finite element analysis method.And the stability of the Embankment at the Filling and Digging Junction is determined by finite element method.(3)Using the geotechnical software Plaxis,the stability of Embankment under different Embankment heights,Embankment width,interface slope,internal friction angle and cohesive force are simulated,and some valuable suggestions are put forward.(4)According to the finite element simulation and field test data analysis,the effect of geogrid,dynamic compaction and anti-slide pile in the Embankment Filling and Digging is studied and sum up a reasonable construction program.