Influence of facing batter angle on reinforcement load of reinforced soil retaining wall with modular block facing
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摘要: 土工合成材料加筋土挡墙具有良好的力学性能和优越的经济性等优点,在国内外得到了越来越广泛的应用。然而,众多加筋土挡墙的试验数据表明,对加筋土挡墙受力机理的理论研究是滞后于工程建设实践的。针对筋材内力计算这一重要问题,研究了面板倾角对加筋土挡墙筋材内力的影响。首先,以RMC试验挡墙为原型,验证了数值模拟方法的有效性;然后,利用数值模拟方法,分析了不同工况下,加筋土挡墙内竖向土压力和筋材应变随着面板倾角增大的变化趋势。数值模拟结果表明,筋材内力随着加筋土挡墙面板倾角的增大而降低。在数值研究结果的基础上,从潜在滑动面附近土单元应力状态及滑动楔形体的平衡两个方面分析了面板倾角的作用机理,定位了填土竖向土压力以及面板基底水平摩擦阻力两个影响筋材内力的关键因素。Abstract: The reinforced soil retaining walls have the advantages of good mechanical performance and high cost effectiveness. They have been widely used all over the world. However, the theoretical researches on the reinforcement load and its mechanism have lagged behind the engineering practice. Many actual experimental data have proven this point. The influence of facing batter angle on the reinforcement loads of reinforced soil retaining wall is investigated. At first, by comparing with the measured results from two Royal Military College (RMC) test walls, the suitability of numerical simulations for the reinforced soil retaining walls is validated. Then, using the numerical simulation method, the vertical earth pressures and reinforcement loads on the reinforced soil retaining wall with different batter angles under different working conditions are analyzed. It is shown that the reinforcement load decreases with an increase in the facing batter angle. Based on the numerical results, the influencing mechanism of the facing batter angle on the reinforcement load is identified by analyzing the mechanical equilibrium of potential sliding wedge and the soil stress near the potential failure surface. The vertical soil stress and base frictional resistance of the facing are two important factors contributing to the reduction of reinforcement load.
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