| Earthquake is one of the important factors that cause the instability and damage of retaining structures such as anti-slide piles.Due to the complexity and unpredictability of earthquakes,the study of seismic response characteristics of slopes and their retaining structures has become a worldwide problem in geotechnical engineering.Prestressed anchor cable anti-slide pile is one of the common methods for slope reinforcement,the study of seismic dynamic response characteristics of prestressed anchor cable anti-slide piles under the condition of base hinge support can provide theoretical basis for seismic design of slope treatment.In view of this,this paper takes the opportunity of the Yunnan Provincial Applied Basic Research Project “Study on Seismic Dynamic Response Characteristics and Seismic Study of Prestressed Anchor Cable Anti-Slide Piles with Base Hinge Support”.In this paper,first of all,by making the completed slope reinforcement model,relying on the large-scale shaking table model experiment and combining the indoor experiment data collected by the sensor,the seismic response of slope acceleration,the displacement response of pile top and the axial force response of anchor cable are analyzed in detail.Secondly,combined with FLAC3 D numerical simulation software,the slope model is simulated and calculated,and the dynamic earth pressure response after pile is supplemented.The main conclusions are as follows:(1)The shape of the acceleration time history curve of the monitoring point at different positions of the sliding body is basically the same as the time history curve of the input seismic wave acceleration.During the earthquake action,the acceleration of the slope increases with the elevation,the amplitude of the acceleration time history increases,and the ground motion response is amplified.Because the reinforcement effect of the anti-slide pile has a hindrance to the seismic wave,the dynamic response of the soil near the anti-slide pile is restrained,so that the acceleration peak near the pile is smaller than the acceleration peak measured on the table.(2)Under the five test conditions,the displacement of the pile top with the angle of anchor inclination of 18° is the largest,and the displacement of the top of the pile with the inclination angle of the anchor is 11°.That is to say,the pile-anchor support system with different anchoring depths has different influences on the displacement of the pile top.As the inclination angle of the anchor increases,the displacement of the pile top also increases.(3)Research anchor axial force response law: anchor Angle respectively,11°,14°,18° three anchor axial force peak are axial force increases with the increase of input seismic peak acceleration faster and faster,the axial force response is more and more obvious.Compared to the axial force of anchor cable in the same time it can be seen that anchor pull Angle value of 11 ° of anchor axial force is the largest,anchor pull Angle to 18 ° minimum value to the axial force of anchor cable.In other words,the axial force of anchor cable decreases gradually with the increase of anchor tension Angle.(4)It can be seen from the measured values of the pile-driven earth pressure above the sliding surface that the pile-driven earth pressure first decreases and then increases from the vicinity of the sliding surface to the pile-anchor joint.Compared to the same location of digging pile under different anchor pull Angle pressure time history curve can be seen: anchor pull Angle to 18° digging pile pressure value maximum,anchor pull Angle minimum value of 11° of digging pile pressure,namely with the increase of anchor pull Angle,at the same location that digging pile pressure value is increased. |
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