Model Test Of Embedded Double Row Anti-slide Piles And Study On Anti-sliding Mechanism

With the development of the national economy and the continuous progress of infrastructure construction,especially the construction of remote mountainous areas,so it is very important to control the slope.As an effective slope retaining structure,Anti-slide piles is becoming more and more popular.But at present people for research on the design theory of Anti-slide piles is not perfect,it is easy to appear in the two case: the first is for the design of Anti-slide piles is too conservative,resulting in engineering waste;second design strength is not enough,there are security risks.Nowadays,there are many researches on single-row piles,but few researches on double-row piles,Compared with single-row piles,the anti-sliding mechanism of double row piles is more complicated,and more factors should be considered.In this paper,the difference of anti-sliding effect of double-row piles under different row spacing is analyzed.The main research contents are as follows:(1)In this paper,the method of laboratory model test is used to study the single-row piles and three kinds of double-row piles with different row spacing.Comparing the difference between single-row piles and double-row piles,the front row piles and the back row piles and the double-row piles of different row spacing,In the displacement of piles top,the soil pressure at the front and back of the piles and piles bending moment.It is concluded that the effect of double-row piles is better than that of the auxiliary support in the front row piles,and the difference of the anti-slide effect of the double-row piles is related to the size of the row spacing.(2)Using FLAC3D software,the Mohr Kulun model is used as the constitutive model of soil,and the pile element(pile)is used to establish the pile model.The single-row piles and three kinds of double-row piles with different spacing are simulated,and the displacement of soil and the top of piles,the soil pressure at the front and back of the piles at different heights and the moment and horizontal stress of the piles are analyzed,and the results are compared with the experimental results.(3)The formation and working mechanism of soil arch are studied,and the force of soil arching is analyzed.The results show that the shape of soil arch is only related to the span,the cohesion of soil and the angle of internal friction.Therefore,once the piles row spacing and soil properties are determined,soil arching shape can be determined.Stress analysis of the arch of the front row piles,and in the limit equilibrium conditions,Combining the transmission of the force between the front row piles and the back row piles,deduced thefront row pile arch curve equation and arch foot stress expression.Numerical simulation is used to study the soil arching of double row piles,and the differences of soil arching forms are analyzed when the load,the cutting height and the row spacing of piles are changed.