摘要:
基于FLAC3D建立了加筋土挡土墙数值模型,在验证模型有效性的基础上,通过调整墙面倾角,分析墙面倾角对模块式加筋土挡土墙的侧向变形、土压力和筋材拉力的影响。结果表明:当墙面倾角由90°逐渐减小至65°时,模块式加筋土挡墙的侧向变形、面墙后的土压力和筋材拉力均出现减小;侧向变形模式由外倾-平移式转为平移、平移-鼓胀式;面板后水平土压力沿墙高的分布规律由线性分布转变为非线性分布;墙内筋材的拉力峰值与墙面倾角间呈线性关系,筋材与模块连接处的拉力与墙面倾角间呈指数关系;75°是模块式加筋土挡土墙的合理倾角,不仅便于墙面绿化,而且可减少挡土墙变形,提高挡土墙的稳定性。
Abstract:
The numerical model of earth-reinforced retaining walls was constructed by FLAC3D, and on the basis of verifying the effectiveness of the model, by adjusting inclination angles of walls, the influence of inclination angles of walls on the lateral deformation, earth pressure and tension of rebars of modular earth-reinforced retaining walls was analyzed. The results indicated that when the inclination angles of walls decreased from 90° to 65°, the lateral deformation, earth pressure and tension of rebars in modular earth-reinforced retaining walls decreasd; the lateral deformation mode changed from the type of outward tilt translation to the type of translation and the type of translation-bulge; the distribution law of horizontal earth pressure behind panels along wall height changed from linear to nonlinear, and there was a linear relation between the peak tension of rebars in walls and the inclination angles of walls; the tension of rebars at connections between rebars and modules exhibited an exponential relation between inclination angles of walls; the inclination angle of 75° was reasonable for modular earth-reinforced retaining walls, which could not only facilitate the greening of walls, but also reduce the deformation of the walls and improve the stability of walls.
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