Research On The Mechanical Characteristics And Engineering Application Of The Inverted H-shaped Double-row Pile Supporting Structure

Guizhou is the only province without plain in China.Its traffic construction is facing many difficulties,such as complicated geological structure and easy occurrence of geological disasters such as landslides.As a new type of retaining structure,the reverse h-type double-row anti-slide pile has the advantages of large spatial stiffness and strong anti-sliding ability compared with conventional anti-slide pile.It has great application prospect in side(sliding)slope treatment engineering,but its engineering application is ahead of theoretical research.In this paper,based on practical engineering,the mechanical characteristics of reverse h-type double-row piles are discussed by combining theoretical analysis with numerical simulation.The main research contents include the following aspects:(1)The types of conventional supporting structure in slope engineering are summarized,and the calculation methods of landslide thrust and lateral geotechnical pressure are summarized too.Based on the analysis of load distribution law and calculation method of reverse h-type double-row piles,the upper and lower calculation model of reverse h-type double-row piles is put forward.(2)Based on the actual project,the internal force and deformation of reverse h-type double-row piles are calculated by the upper and lower calculation model,and the law of force and deformation is analyzed.The in-situ deformation monitoring and data analysis of the supporting structure are summarized.(3)The internal force distribution and deformation under the same landslide geological conditions between the reverse h-type double-row pile and the single-row anti-slide pile and the gantry pile are compared and analyzed,and the superiority of the reverse h-type double-row pile in the force is obtained.(4)Combined with the actual project,the numerical model was established by using Midas GTS NX software.The influence of different structural parameters such as pile diameter,pile length,row spacing,rock-socketing depth,connecting beam stiffness and front pile cantilever height on the force of reverse h-type double-row piles is analyzed.Finally,a reasonable range of values for each parameter is proposed.