| China is a hilly and mountainous terrain,complex and diverse terrain,mountains and downs of the larger countries,mountain hills accounted for about 43% of the total land area.At the same time,it is one of the most concentrated and active earthquakes in mainland china.Therefore,it is of great significance to study the seismic performance of retaining structures under earthquake.As a new type of composite retaining structure,because of its good stress mode and skid resistance,pre-stressed anchor cable anti slide pile has been widely used in engineering.However,relative to its engineering applications,the theoretical research,especially the research on the dynamic charac teristics of single anchor cable anti slide pile and the seismic performance optimization of anchor anti slide pile,are obviously lagging behind.Therefore,this paper carried out a large-scale shaking table test,using mixed mode loading,preliminary study on dynamic characteristics of seismic effect of single anchor and multi anchor cable anti slide pile and reinforcement of slope deformation and it's failure mode.And through numerical simulation,with the action of peak value,the displacement and deformation characteristics of anti slide piles with anchor cables are studied under different loads.Finally,to solve the seismic performance of the anchor head in the actual process of failure and improve the anchor anti sliding pile,combined with China's seismic design code,reference documents,engineering examples and seismic structure,the seismic anchor anti slide pile is proposed,and through the open test shaking table experimental study the optimization effect under the action of earthquake.Research contents and results:(1)The first experiment shows that the vibration sliding body does not necessarily destroy along the weak sliding surface;the failure forms of slope surface are the composite failure of tension and shear.Moreover,the slope displace ment of multi anchor and anti slide pile is smaller,which is beneficial to control the further deformation of the slope.(2)Because of the small horizontal inclination of the post of post-anchor pile,the side shows that the seismic performance of multi anchor cable anti slide pile is better in the high intensity earthquake area.(3)The greater the input EI-Centro peak acceleration is,the greater the earth pressure peak of anchor anti slide piles is.According to the distribution curve of dynamic earth pressure,the ground pressure of the multi anchor anti slide pile is smaller and the distribution is reasonable.(4)The numerical simulation results show that the reinforced slope has the following characteristics in the way of loading the anchor anti sliding pile: Z direction to load,the displacement of slope rear edge is larger,and has obvious elevation effect;X direction to load,the displacement at the sliding surface and under the part is larger,which is the main factor causing slope failure.Under biaxial loading,the deformation of the slope is larger than that of the unidirectional loading,and with the increase of the dynamic peak acceleration,the vibration effect of Z increases continuously,and plays a more significant role in the failure of the slope.(5)The second experiment shows that,after the post earthquake,the energy dissipation spring between the anchor head and the pile of anchor pile can relieve the anchor head failure in a certain extent.(6)Setting the EPS material behind the pile can reduce the dynamic pressure on the side of the force,and the effect of energy dissipation is related to the input dynamic peak acceleration.The greater the input dynamic peak acceleration,the lower the buffering energy dissipation effect.When the input dynamic peak acceleration is less than 0.6g,the optimized anchor cable anti slide pile has better seismic performance,and the earth pressure peak value decreases obviously,with a drop of about 50%.(7)Through the analysis of experimental and measured results,it is concluded that the above optimization measures are effective and can provide reference for the design of anchor cable anti slide pile in high intensity earthquake area... |
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