基于层合板理论的多层加筋碎石垫层承载特性分析

为研究多层加筋垫层自身极限承载特性，考虑多层土工格栅的加筋作用，假设加筋垫层为层合板，并根据静力平衡条件和应变连续条件，分析得出加筋垫层的极限承载能力计算方法，通过室内试验对理论推导公式进行结果验证。研究结果表明:理论计算与试验结果吻合较好；随着格栅层数、垫层厚度、碎石抗剪强度的增加，多层加筋垫层自身极限承载能力增强；随着桩间距和底层格栅距桩帽距离的增大，多层加筋垫层自身极限承载能力降低。

Analysis of Multi-layer Reinforced Cushion Bearing Capacity Based on Laminated Plate Theory

To analyze its ultimate load-bearing characteristics,the reinforced cushion layer with multi-layer geogrids was regard as a laminated plate.The interaction characteristics between multi-layer geogrids and gravel cushions were analyzed.Combined with strain continuous condition and static equilibrium condition,the calculation method of ultimate bearing capacity of reinforced cushion was derived.The calculation method was validated by indoor experiment.It shows that the analytical solutions have good agreement with the measured data.With the increase of the total number of geogrid layers,the thickness of the cushion layer and the shear strength of the gravel,the ultimate bearing capacity of reinforced cushion increases.With the increase of the spacing from the bottom geogrid to pile cap and pile spacing,the ultimate bearing capacity of reinforced cushion decreases.