Vol15 No.4: 825-844
【Title】Study on the performance of the micropile-mechanically stabilized earth wall
【Author】ZHANG Zhi-chao1; Ronald Y. S. PAK2; CHEN Yu-min3*; LIU Han-long4
【Addresses】1 Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Land and Resources of China, Fuzhou, 350002, China; 2 Department of Civil, Environmental & Architectural Engineering, University of Colorado, Boulder, CO, 80309, USA; 3 College of Civil & Transportation Engineering, Hohai University, Nanjing, 210098, China; 4 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400045, China
【Corresponding author】CHEN Yu-min
【Citation】Zhang ZC, Pak RYS, Chen YM, et al. (2018) Study on the performance of the micropile-mechanically stabilized earth wall. Journal of Mountain Science 15(4). https://doi.org/10.1007/s11629-016-4010-7
【Abstract】The Micropile-Mechanically Stabilized Earth (MSE) wall, specially designed for mountain roads, is proposed to improve the MSE wall local stability, global stability and impact resistance of roadside barriers. Model tests and the corresponding numerical modeling were conducted to validate the serviceability of the Micropile-MSE wall and the reliability of the numerical method. Then, a parametric study of the stress and deformation of Micropile-MSE wall based on the backfill strength and interfacial friction angle between backfill and backslope is conducted to evaluate its performance. The test results indicate that the surcharge-induced horizontal earth pressure, base pressure and lateral displacement of the wall panel of Micropile-MSE wall decrease. The corresponding numerical results are nearly equal to the measured values. The basic failure mode of MSE wall in steep terrain is the sliding of backfill along the backslope, while A-frame style micropiles are capable of preventing the sliding trend. The maximum resultant displacement can be decreased by 6.25% to 46.9% based on different interfacial friction angles, and the displacement can be reduced by 6% ~ 56.1% based on different backfill strengths. Furthermore, the reduction increases when the interfacial friction angle and internal friction angle of backfill decrease. In addition, the lateral displacement of wall panel, the deformation of backfill decrease and the tension strain of geogrid obviously, which guarantees the MSE wall functions and provides good conditions for mountain roads.
【Keywords】Mechanically stabilized earth wall; Model test; Micropile; Numerical simulation; Stress and deformation behavior