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为了研究路面荷载作用下土工格室加筋体的受力与变形机理,正确反映土工格室加筋体与地基之间的荷载传递模式,建立了考虑路基填料和地基土体剪切作用的土工格室加筋体简化分析模型。路基填料和地基土层采用双参数的Pasternak模型,克服了传统Winkler地基模型无法考虑路基填料和地基中应力扩散的缺点。土工格室加筋体简化为埋置于地基中的有限长梁,以考虑其抗弯刚度的影响。基于特征值分解法求解土工格室加筋体变形微分控制方程,得到了准解析的解,并可直接得到路面荷载作用下土工格室加筋体的弯矩和剪力分布。该文模型在土层剪切刚度趋于足够小时,可退化到采用Winkler地基时的土工加筋体分析模型。计算发现考虑土体的剪切特性对准确分析土工格室加筋体的受力和变形十分重要;同时发现当下卧地基较软弱时,土工格室加筋体的加固作用更加明显。
In order to study the stress and deformation mechanism of geocell reinforced body under pavement load and correctly reflect the load transfer mode between geocell reinforced body and foundation, a geotechnical Lattice reinforced body simplified analysis model. The two-parameter Pasternak model is used for the subgrade and subgrade so as to overcome the shortcomings that the traditional Winkler foundation model can not consider the subgrade filler and stress spread in the foundation. The geocell reinforced body is reduced to a finite length of beam embedded in the foundation to account for the effect of its flexural rigidity. Based on the eigenvalue decomposition method, the governing equations of geocell reinforced body are solved, and the quasi-analytical solution is obtained. The bending moment and shear force distribution of geocell reinforced body under pavement load can be directly obtained. When the soil shear stiffness tends to be small enough, the model degenerates to the geotechnical analysis model when the Winkler foundation is used. It is found that it is very important to consider the shear characteristics of soil mass to accurately analyze the stress and deformation of geocell reinforced body. At the same time, it is found that the reinforcing effect of geocell reinforced body is more obvious when the foundation is more weak.