土工格室作为一种特殊的土工合成材料,其三维蜂窝结构能够显著约束土体的侧向变形,在加筋路基、边坡和挡墙等结构中有着广泛的作用。在加筋土结构的服役过程中,土工格室难免会受到不同角度和不同层位的剪切作用,潜在滑动面极有可能穿过土工格室加筋层。为更好地理解土工格室加筋层的真实剪切状态,基于直剪试验,使用数值计算的方法研究了土工格室加筋层在不同剪切角度、层位和不同宽高比下的应力-应变状态。结果表明:土工格室加筋层呈现明显的各向异性,土工格室对黏聚力和内摩擦角都有所提高,这与现行的三轴试验研究结果稍有不同;当剪切面平行穿过土工格室中部时,加筋层的抗剪强度最大;随着剪切面与土工格室角度的增加,加筋层的抗剪强度逐渐减小;随着土工格室宽高比的线性增加,加固层的抗剪强度也基本线性增加。研究成果可为土工格室加固路基、边坡和挡墙的稳定性研究提供参考。
Abstract
Geocells, characterized by a three-dimensional honeycomb structure, are commonly utilized as a specialized geosynthetic material to restrict lateral soil deformation in the reinforcement of subgrades, slopes, and retaining walls. Throughout the operational lifespan of geocell-reinforced soil structures, the geocells are subjected to varying angles and layers of shear forces, potentially leading to the penetration of potential sliding surfaces through the geocell reinforcement layer. In order to examine the actual stress distribution within the geocell-reinforced layer, we analyzed the stress-strain behavior under different shear angles, layers, and width-to-height ratios using numerical methods based on direct shear tests. The findings demonstrate evident anisotropy within the geocell-reinforced layer. The geocell enhances the cohesion and internal friction angle of the soil, exhibiting disparities from existing triaxial test outcomes. Maximum shear strength of the reinforcement layer is observed when the shear plane passes through the middle of the geocell in parallel. As the angle between shear plane and geocell increases, the shear strength gradually diminishes. Furthermore, an increase in the width-to-height ratio of geocell corresponds to a linear rise in shear strength.
关键词
土工格室 /
土工合成材料 /
直剪 /
数值模拟
Key words
geocell /
geosynthetics /
direct shear /
numerical simulation
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基金
国家自然科学基金项目(42077262,42077261)
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