RELIABILITY BASED DESIGN FOR DEFORMATION TARGETED SEGMENT MECHANICALLY STABILIZED EARTH WALL

Yi-Che Wu ； Chia-Nan Liu ； Bo-Hung Lin

《Journal of GeoEngineering》 15卷1期 (2020/03) Pp. 1-11

https://doi.org/10.6310/jog.202003_15(1).1

摘要

The application of probabilistic concept has been pervaded in the analysis and design of geotechnical structures recently. For example, the reliability of stability, instead of deterministic stability, for mechanically stabilized earth (MSE) walls has been popular. This paper presents a study of reliability analysis of MSE wall targeting on the wall performance, explicitly the maximum wall face deformation. First, a numerical model for simulating a segment MSE wall is developed. This numerical model is verified through a promising comparison with deformation and stress measurement as reported in the literature. A numerical experiment set consisting of 729 simulations by varying important design parameters including wall height, wall inclination, soil friction angle, stiffness of segments, extent of reinforcement, and magnitude of surcharge is then conducted. The database of maximum wall deformation under different combination of design parameters of MSE wall is regressed, using the response surface method to build an approximate equation between design parameters and dimensionless maximum wall deformation. The suitability of approximate equation is examined by its sound comparison with numerical simulation results. Types of model uncertainties in the approximate equation from numerical simulation results and from the measurement records are then estimated. A series of parametric analysis is conducted to identify how the magnitude and uncertainty in the parameters affect the probabilistic performance of wall face deformation. The procedures of how to perform probabilistic analysis of segmental MSE wall, under certain constrain of maximum wall face deformation, is provided by charts showing reliability versus design parameters.

關鍵字

Probabilistic analysis ； regression ； Monte Carlo Simulation ； MSE wall ； reliability based design