Study on the Interaction Mechanism between Micropiles and Soil Landslides

Abstract

The interaction mechanism between micropiles and soil landslides is comprehensively investigated through static model tests and numerical simulations. The results show that the deformation damage mode of micropiles is mainly bending and shear damage. Because of bending deformation, cracks appear at the rear and front of the pile, respectively, about three times the pile diameter from the sliding surface. In addition, the plastic damage becomes more severe when approaching the back edge of the landslide body. Micropiles in the landslide body play a significant role in load sharing; more importantly, there is a certain pattern between the miniature piles. According to the experimental and numerical simulation results, the recommended load-sharing ratio for micropile design under static conditions is as follows: rear-row pile:middle-row pile:front-row pile = 0.411:0.348:0.241. The research in this paper reveals the good effect of micropiles against landslides, explains the mechanism of pile–soil interaction, and provides a theoretical reference for the research and application of micropiles in engineering.

Study on the Optimization of Pile Length of Micropiles in Soil Landslides

“…The specific distribution ratios are determined according to Table 1. Data in Table 1 are derived from the previously conducted tests, and the landslide thrust was actually measured based on the pressure boxes arranged in the middle and back rows of piles before and after the tests, which ultimately resulted in the landslide inference coefficients [28]. According to the relevant experimental results, it can be assumed that when the micropile is subjected to bending and shear, the pile body will shift from mainly bearing bending and shear to mainly bearing tensile and compressive forces after the pile body bends and cracks.…”