【摘要】 运用摩擦动员理论对有限元计算结果进行分析,结合试验和实体工程观测资料的对比,研究土工网格加筋土体的垂直应力、水平应力、剪应力的变化规律以及对路堤沉降和整体稳定性的影响.分析结果表明:加筋使土体内部的应力重新分布,垂直应力和水平应力减小,剪应力增大,摩擦动员率提高,抗剪强度有效发挥,加筋土体的受力状态得到明显改善;加筋后,路堤沉降和侧向位移减小,其整体稳定性、承载能力和抵抗变形的能力增强;结果还表明,土工网格的加筋效果优于金属条带.更多还原

【Abstract】 Based on the mobilized friction theory, the resu lts of finite element calculation was analyzed by comparing with the test and th e observed performances of the reinforced eart h in practical engineering . The variances of vertical, horizontal, shear stress in the reinforced earth , their effects on bridge approach settlements and the stability of the embankment are considered. Results show that the soil stresses exhibit redistribution due to reinforcement, in which the ve rtical and horizontal stresses decrease, while the shear stress and the ratio of the mobil ized friction increase, thus the mechanical performances of the reinforced earth improves greatly. As a result of reinforcement , the vertical settleme nt and lateral displacement are reduced, and the global stability, the capacity and resistance to deformation of the reinforced embankment are st rengthened. Moreover, the effect of the reinforcement with geogrid always gains an advantage over that with the metallic strip.更多还原