Dynamic Response Of Retaining Wall Under Seismc Excitations

Retaining wall is the soil structure which can avoid soil collapse,it is widely used in soil retaining in building engineering,hydraulic engineering.railway engineering and highway engineering etc.Once the retaining wall is destroied,it can not only affect the normal service and its function,but also cause the subgrade or slope failure.The earthquake damage of retaining structure shows that when the retaining wall is destroied,it can cause road damage,and even stop transportion.Seismic Force in Wenchuan Earthquake directly destroied a great deal of retaining walls,especially walls that because of rotation,that’s bring a huge economic loss.so the study of dynamic earthpressure of retaining wall under seismic action plays an important part in the anti-seismic design of retaining wall.The main research contents in this paper are as follows:1.After the Wenchuan Earthquake.the research group explored the reconstruction project of the submerge section of ZiPingpu reservoir in national highway No.213.The 30.6km long. The original anti-seismic design is based onⅦdegree site basic seismic intensity.During Wenchuan Earthquake,this road section is inⅨ,Ⅹ,Ⅺseismic intensity, walls along the line are almost on rock foundation.It is discovered that the walls’main failure is toppling.2.Shaking table model test is done.The straight model retaining wall is made of C15 reinforeced concrete. The input wave used in test is Wenchuan Wave, Elcentro Wave,Kobe Wave and synthetic Wave in the proposed railway from DaLi to Ruili. The Peak acceleration used in test is 0.1g,0.2g and 0.4g.It studies the dynamic earth pressure value and distribution pattern and the relationship between them and the three elements of earthquake which is the Magnitude of seismic waves, Wave spectrum and duration time in four different wall height during and after the earthquake.Based on the elastic-plastic theory in FLAC3D, numerical simulation computation is done corresponding to the Shaking table model test. the results corrected by Shaking table model test results. Research group believe that model and material parameters after correction is viable.3、Using model after correction, wall dynamic respone with the height of 4m、8m、12m、16m and 20m under seismic action with the peak acceleration of 0.1g,0.2g,0.4g,0.6g�'�0.8g(Corresponding toⅦ,Ⅷ,Ⅸ,Ⅹ�'�Ⅺdegree earthquake) is done by numerical simulation calculation The characteristics of action point and the earth pressure changeing with the seismic intensity is analysed in different wall height. 4、Dynamic response of 4m,8m high yangxieshi、fuxieshi(the masonry volume is eauql to the straight retaining wall) that under seismic action with the peak acceleration of 0.1g, 0.2g, and 0.4g. is calculated. Earth pressure value and distribution pattern of walls with different types under seismic action is obtained and the characteristics is concluded during and after the earthquake.5、Taking the straight wall with the height of 8m and the sany soil,gravel soil as caluated model, it analysed the material characteristics how affects the dynamic earth pressure distribution by changing the elastic Modulus,Posson’s ratio and internal friction angle.