循环荷载作用下土工格栅加筋泡沫轻质土动力特性
Dynamic Characteristics of Geogrid-Reinforced Foamed Lightweight Soil under Cyclic Loading
DOI: 10.12677/ms.2026.164080, PDF,   
作者: 密启亮, 陈 宁：新泰市交通运输局公路事业发展中心，山东 新泰；王艺璇*：山东长兴路桥工程集团有限公司，山东 新泰
关键词: 泡沫轻质土；土工格栅加筋；动三轴试验；动弹性模量；阻尼比；Foamed Lightweight Soil； Geogrid Reinforcement； Dynamic Triaxial Test； Dynamic Elastic Modulus； Damping Ratio
摘要: 为探究土工格栅加筋泡沫轻质土的动力特性及其影响因素，基于动静三轴试验系统，开展了室内动三轴试验，探讨了加筋层数和湿密度对其动态力学特性的影响规律，分析了骨干曲线、动剪切模量及阻尼比的变化特征。试验结果表明，双曲线形式的骨干曲线可由Hardin-Drnevich模型较好地描述。土工格栅加筋泡沫轻质土的动弹性模量和阻尼比均随动应变的增大而增大；采用格栅加筋和提高湿密度均可有效提升动弹性模量，而阻尼比的显著提升仅依赖于增大湿密度。最后，建立了考虑湿密度和加筋层数的动弹性模量强化模型与阻尼比预测模型，间接反映了土工格栅加筋泡沫轻质土的动偏应力–动应变关系。
Abstract: To investigate the dynamic characteristics of geogrid-reinforced foamed lightweight soil and their influencing factors, laboratory dynamic triaxial tests were conducted using a dynamic and static triaxial testing system. The effects of the number of reinforcement layers and the wet density on the dynamic mechanical properties were explored, and the variation characteristics of the backbone curve, dynamic elastic modulus, and damping ratio were analyzed. The experimental results indicate that the hyperbolic form of the backbone curve can be well described by the Hardin-Drnevich model. Both the dynamic elastic modulus and damping ratio of the geogrid-reinforced foamed lightweight soil increase with the increase of dynamic strain; the use of geogrid reinforcement and an increase in wet density can effectively enhance the dynamic elastic modulus, while a significant increase in the damping ratio depends solely on the increase in wet density. Finally, a dynamic elastic modulus strengthening model and a damping ratio prediction model were established, taking into account the wet density and the number of reinforcement layers, which indirectly reflect the relationship between dynamic deviatoric stress and dynamic strain of the geogrid-reinforced foamed lightweight soil.
文章引用：密启亮, 王艺璇, 陈宁. 循环荷载作用下土工格栅加筋泡沫轻质土动力特性[J]. 材料科学, 2026, 16(4): 127-142. https://doi.org/10.12677/ms.2026.164080

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