Study On Stability Of Hinge Block Ecological Slope Under Earthquake-Rainfall Coupling

Slope instability is one of the widely distributed geological disasters,causing huge loss of life and property each year.Earthquakes and rains are two major factors that affect slope stability and are the focus of many scholars' research.The ecological slope of the hinged block is applied in the practical engineering and has good slope protection effect because of its low cost,simple construction and high safety.Due to the lack of dynamic stability of the hinge block ecological slope under seismic rainfall coupling,it has seriously restricted its development and optimization design.It is of great theoretical and engineering application value to analyze the dynamic stability under seismic rainfall coupling.In this paper,the research is based on the DaSheng Lake slope protection engineering example.Two main research methods are used in this paper,shaking table model test and FLAC3D numerical simulation,to make research between the natural soil slope and the hinge block ecological slope.The dynamic response of the dynamic stability was studied by analyzing the parameters such as acceleration,dynamic earth pressure,displacement,pore water pressure and safety factor under earthquake and seismic rainfall coupling.The numerical simulation results are well verified by the test,the main findings and achievements are as follows:Shaking table test model and scheme design were carried out,and the dynamic analysis of FLAC3D was carried out.A research is made on dynamic stability of the hinge block ecological slope in different conditions,different acceleration and different type in this paper.In the earthquake,the PGA magnification coefficient and the dynamic earth pressure have the effect of "enlargement"and "vertical magnification".The maximum displacement is located at the foot position and the maximum vertical displacement is located at the shoulder position.The safety factor is smaller than the initial stress state.With the increase of the amplitude of the seismic wave,the PGA gradually becomes smaller,the dynamic earth pressure increases but the increasement decreases,and the"level saturation" phenomenon occurs,the horizontal and vertical displacement gradually increases,the safety factor decreases.Followed by Castaic wave,Artificial wave,Taft wave action,PGA and displacement increases,the safety factor is gradually reduced.Under the conditions of earthquake,the parameters of the ecological slope of the hinged block are better than those of the natural soil slope,and the former has better seismic performance.The basic theory of seepage field coupling in stress field is studied,and the static percolation of hinged block ecological slope is simulated and analyzed.The shaking table model test and the numerical simulation dynamic stability of the hinge block ecological slope under the coupling of seismic rainfall are carried out.The results show that the dynamic response of the parameters of the hinge block ecological slope is similar to that of the earthquake alone.However,the PGA of the hinge block ecological slope increases,the displacement deformation increases and the safety factor decreases,and the pore water pressure is And the effective stress is reduced.The corresponding parameter is better than the natural soil slope under the same working condition.Under the coupling of seismic rainfall,the ecological slope of the hinge block shows better anti-seepage and anti-seismic performance than the natural soil slope.On the whole,under the action of seismic rainfall coupling,the parameters of hinge block ecological slope are better than those of natural soil slope,and the former has better anti-seepage and seismic performance,and the stability is proved well.