Study On The Stability Of Eroding Coast Under The Protection Of Geogrid Cage

The existing coastal erosion protection technologies,such as seawall,revetment,spur dike and offshore dike,have some problems,such as high cost,high maintenance cost,difficult construction,long construction period,heavy weight and limited scope of coastal erosion protection.Therefore,how to create a low cost and convenient coastal erosion protection method is an important topic.Therefore,this thesis proposes to use low-cost,convenient construction,small self weight,strong corrosion resistance,low maintenance cost geogrid cage to protect coastal erosion.Based on ABAQUS numerical analysis software,the stability of the eroding coast under the protection of geogrid cage is studied.The wave load is simulated by pushing plate,and the displacement and stress characteristics of the soil and geogrid cage are compared under different working conditions.The specific research contents are as follows:(1)Considering the influence of the shape of geogrid cage on the stability of coastal erosion protection,the protection effect of three different cross-section shapes of geogrid cage,namely square geogrid cage,circular geogrid cage and wavy geogrid cage,on the horizontal displacement and stress of coastal soil and the displacement and stress of geogrid cage are analyzed,the shape of wavy geogrid cage which has the most significant effect on coastal erosion protection is determined.(2)Considering the influence of wave intensity on the stability of the eroding coast under the protection of wavy geogrid cage,the wave intensity is simulated by changing the amplitude and frequency of wave generated by push plate.The protection effect of geogrid cage on horizontal displacement and stress of coastal soil is analyzed,and the displacement and stress of geogrid cage are analyzed.The peak value and residual value of displacement and stress are compared and analyzed.(3)Considering the influence of the slope angle on the stability of the eroding coast under the protection of wavy geogrid cage,the protection effect of the geogrid cage on the horizontal displacement and stress of the coastal soil and the displacement and stress of the geogrid cage are analyzed by changing the size of the slope angle.The peak value and residual value of the above parameters are analyzed,and the difference of the effect of the geogrid cage for coastal erosion protection under different slope angles is obtained.(4)Considering the influence of wave duration on the stability of the eroding coast under the protection of wavy geogrid cage,a long duration calculation is carried out.The protection effect of geogrid cage on the horizontal displacement and stress of coastal soil and the residual displacement and stress of coastal soil under different duration are compared,and the horizontal displacement and stress of geogrid cage under wave action are compared.(5)Considering the influence of geogrid strength on the stability of the eroding coast under the protection of wavy geogrid cage,this thesis compares the protection effects of three kinds of geogrids with different strength on the horizontal displacement and stress of coastal soil,and compares the displacement and stress response characteristics of geogrids with different strength under wave action.(6)In order to promote the application of geogrid cage in coastal erosion protection engineering,the construction technology of wavy geogrid cage for coastal erosion protection is proposed,including geogrid cage structure details,construction formwork,construction steps and process advantages.