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Title: Effects of Temperature and Suction on Safety Factor against Pullout Failure of Mechanically Stabilized Earth under Undrained Condition
Authors: Anuchit Uchaipichat
DOI:
Aff: Department of Civil Engineering, Vongchavalitkul University, Nakhon Ratchasima, 30000, Thailand.
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Keywords: Mechanically Stabilized Earth; Thermal Effect; Suction; Factor of Safety; Undrained Condition
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Abstract:Background: Mechanically stabilized earths can be encountered in construction projects located on the area affected by facilities generating heat. The compacted granular soils are usually selected as backfill materials to produce essentially free-draining paths. However, it is difficult in some areas to find granular soils which have to be hauled from other areas. In order to decrease construction costs, the fine-grained soils may be allowed to use in some projects and the short-term or undrained condition analysis must be performed to calculate factor of safety. However, the shear strength of soils, the essential parameter in safety factor calculation, can increase with increasing matric suction but decrease with increasing temperature. Objective: The main purpose of this study is to derive the expression of safety factor against pullout failure of mechanically stabilized earth including temperature and suction effects and simulate the variation in safety factor with temperature and suction under undrained condition. Results: The simulation results show that the safety factor against pullout failure under undrained condition decreased with increasing depth for all values of temperature. The results also show that the safety factor for all steel strip layers decreased with increasing matric suction for the suction ranging from 0-100 kPa but increased win increasing matric suction for suction greater than 100 kPa. Moreover, the factor of safety decreased with increasing temperature for all values of matric suction. Conclusion: The expression of safety factor against pullout failure of mechanically stabilized earth including temperature and suction effects was derived in this study. The simulation of variation in safety factor with temperature and suction under undrained condition was performed on a wall reinforced by ribbed galvanized steel strips. The simulation results show a decrease in safety factor against pullout failure under undrained condition with increasing depth and temperature. The safety factor for all steel strip layers decreased with increasing matric suction at low level of suction.n