Study On The Stability Of Single-Stage Reinforced Earth Retaining Wall Of Dechang Station On The Newly Built Kunming Railway

At present,although there are current regulations in China that clearly stipulate the design of single-stage reinforced earth retaining walls,the design of reinforced earth retaining walls is mainly based on the design method of gravity reinforced earth retaining walls,and the middle reinforcement of the retaining walls-The complexity of the internal function of the soil composite structure is relatively simple,so the design is usually conservative.Therefore,studying the stability of reinforced earth retaining walls is still a very important subject.In this paper,through theoretical analysis and numerical simulation,with the help of the actual construction site of the reinforced earth retaining wall of the newly built Dechangxi Station of the Kunming Railway,the following work is mainly done:(1)Read the relevant domestic and foreign literature on reinforced earth retaining walls,understand and study the existing relevant research results,and elaborate the structural form and failure mechanism of reinforced earth retaining walls.(2)Through theoretical calculations,the internal and external stability analysis of single-stage reinforced earth retaining wall under natural and seismic conditions was carried out.The stability analysis meets the specification requirements,indicating that the reinforced earthretaining wall can be kept stable;under seismic conditions,when the seismic acceleration of the reinforced earth retaining wall is 0.2g,0.3g,0.4g,0.6g,the internal and external stability The analysis and calculation results meet the specifications;when the seismic acceleration is 0.8g,the safety factor of anti-pull stability and anti-overturn stability does not meet the requirements of the specification;when the seismic acceleration is1.0g,the safety factor of anti-pulling stability,the anti-slip stability and anti-overturn stability does not meet the requirements indicating that the reinforced earth retaining wall is In some cases,damage may occur.(3)Using FLAC 3D software to simulate the single-stage reinforced earth retaining wall at Dechang West Station.Specifically,it is divided into natural conditions(self-weight condition,train static load,railway dynamic load)and earthquake conditions(seismic acceleration are 0.2g,0.3g,0.4g,0.6g,0.8g,1.0g)respectively Analysis of wall top settlement,panel horizontal displacement,rib stress and potential fracture surface.