Experimental Study On The Mechanical Behavior Of Double-row Anti-slide Piles With Plum-shaped Layout

Anti-slide piles have been widely used in landslide control projects due to their strong anti-sliding ability,flexible layout and convenient construction.In the large thrust and large thickness landslide control project,the single-row anti-slide pile can not meet the anti-sliding requirements.At this time,it is necessary to set up double-row or even multi-row anti-slide piles for treatment.This paper briefly introduces the development status of double-row anti-slide piles.It mainly focuses on the plum-line type double-row anti-slide pile support method,and studies the experiment in the landslide disaster control project in the loess area.At the same time,reference to numerical simulation calculation and parallel layout experiment results for comparative analysis and verification,the main research results are as follows:(1)The plum blossom type is equipped with double-row anti-slide piles and the landslide thrust,the maximum value is located near the sliding surface in the sliding body.The ratio of the landslide thrust undertaken by the rear row pile and the front row pile is between 1.35 and 1.45.(2)The resistance of the soil in front of the pile with double-row anti-slide piles is roughly parabolic,and the resistance ratio between the rear and front piles is about 1.42.Below the slip surface is mainly concentrated near the sliding surface near the sliding surface,the ratio is about 1.13.(3)The bending moments of the two rows of piles are all "S" type,and the peaks are all close to the sliding surface,and the distribution forms are roughly the same.Under the limit load condition,the pile near the slip surface is combined and broken by bending and shearing.(4)By comparing the finite element simulation results with the experimental measured values,the reliability of the finite element simulation is further discussed.By analyzing the data of the forces before and after the piles,the double-row anti-slide piles are defined before and after the slip surface.Tensile deformation occurs after the following piles,and compression deformation occurs in the piles behind the slip surface and before the pile below the slip surface.(5)By comparing the experiments with double-row anti-slide piles arranged in parallel with the connecting beams,the following conclusions can be drawn;(1)plum layout can reduce the shadowing effect of the rear piles on the front row piles,so that the soil in front of the pile can provide more soil.Resistance,can better play the linkage between pile and soil,and thus can withstand greater landslide thrust;(2)Parallel layout and plum-type layout have a greater impact on the bending moment of the front anti-slide pile,which is arranged before parallel The anti-sliding pile has a small bending moment.This shows that the parallel arrangement of the beams can not play the linkage between the two rows of piles.In summary,in the landslide treatment with double-row anti-slide piles,the arrangement of the pile position is easy to use plum type.