Analysis Of Stress Characteristics And Optimization Design Of Portal Double Row Anti Slide Pile

Landslide refers to the geological disaster formed by the slope sliding along its internal weak surface or weak zone under the action of gravity.The commonly used retaining structures in landslide control engineering are anti slide retaining wall,anti slide pile,pre-stressed anchor cable anti slide pile,pre-stressed lattice anchor cable(pole),etc.Compared with other anti slide structures,anti slide piles have many advantages,such as strong anti slide ability,flexible setting of pile position,mature construction technology,reliable treatment effect,etc.they have been widely used in the field of landslide prevention and control engineering,and have become one of the main structures in the current landslide retaining structure.The portal double row anti slide pile has the characteristics of high anti push rigidity and convenient construction,which has a good application prospect in large-scale landslide control engineering.In this paper,the stress characteristics analysis and optimal design of the double row anti slide pile are taken as the subject,and the influence of different landslide thrust and row spacing on the internal force of the double row anti slide pile is analyzed and studied by using numerical analysis method and ABAQUS finite element analysis software modeling.By using MATLAB software,taking the minimum moment difference and the minimum shear difference on the control section of front and rear row piles as the objective,the optimal row spacing of double row anti slide piles under different landslide thrust is optimized and analyzed,which provides the basis for the large-scale landslide to adopt double row anti slide pile support under specific geological conditions.The conclusion is as follows:(1)With the increase of landslide thrust,the displacement,shear force and bending moment of the front and rear row piles increase gradually.The increase rate of the rear row piles is greater than that of the front row piles,and the stress of the rear row piles is greater than that of the front row piles(2)With the increase of the distance between the front and rear row piles,the horizontal displacement of the top of the anti slide pile decreases gradually,but it does not change much as a whole.The maximum shear force and the maximum bending moment of the front and rear row piles decrease gradually.The maximum shear force and the maximum bending moment of the rear row piles are larger than that of the front row piles.(3)The reasonable row spacing of the double row anti slide pile is mainly affected by the geological conditions of the sliding bed and the length of the pile.The size of the landslide thrust has little influence on it.When the sliding bed is strongly weathered quartz sandstone and the pile length is 20 m,the reasonable row spacing of the double row anti slide pile is 4-6 M.(4)The research results of this paper have been applied to the optimal design of a practical landslide control project and achieved good results.