Characteristics and Application of Micropiles in Slope Engineering: Fid-Bau Portal

Characteristics and Application of Micropiles in Slope Engineering

Ma, Li / Hu, Yifu / Gu, Desheng / Jiang, Chong

Abstract As the application of micropiles being extended from foundation engineering to landslide engineering, some transforms of the mechanism and behaviors of micropiles have happened. A scaled slope was modeled in the lab to simulate three slope failure modes respectively, including sole slope, slope reinforced with single piles and composited piles. Besides, theoretical analysis about influencing factors was researched which was aimed to compare the slope failure and resistance and anti-sliding characteristics of micropiles. Taking the displacement, lateral loading and moments along micropiles shaft as main targets, the results illustrate that micropiles have provided higher resistance to slope compared to sole sliding slope. The reinforcement effect of composited piles performs better than single piles. It also turns about to present several deformation stages covering compaction, elastic deformation and plastic deformation and ultimate failure stages. In addition, a close insight into the influence of soil load, pile diameter and length, coefficient of subgrade on micropiles’ performance has been given respectively. The application condition and circumstance of micropiles can be concluded consequently. It is expected that micropiles are considerably suitable for shallow landslide reinforcement while slope height less than 10 m, or sliding force under 300 kN/m, or coefficient of subgrade greater than 10000.