高速公路加筋陡坡路基长期工作特性研究

为研究高速公路环境与边坡填筑一体化设计关键技术，在对某高速公路段12 m高加筋边坡进行长期工作特性的现场试验研究基础上，建立考虑格栅黏弹性和土体黏弹塑性流变模型的高速公路加筋边坡数值分析模型，采用增量-初应变迭代法对各种工况进行了分析计算。通过与试验测试数据的对比，验证数值的可靠性，进而进行大量变动参数的数值分析，详细地探讨加筋边坡填筑过程中加筋结构的力学特性。在将试验数据和数值分析结果的对比分析的基础上，得到边坡加筋体内土压力、地基应力和格栅拉力分布规律及其成因，随后与类似加筋直墙和单级加筋路堤的研究结果对比，得到多级加筋陡坡的一般规律及其破坏模式。

Study of long-term performances of reinforced slope at expressway

A field measured model which is 12 m high is built to study the long-term performances of grid reinforced slope.At the same time,a numerical procedure based on finite element methods for analysis of behavior of deformations and stresses of reinforced earth structures is presented.In the proposed method,the nonlinear creep behavior of both backfill and geosynthetics used for reinforcements is taken into account by using the rheological models of visco-elasto-plasticity and nonlinear visco-elasticity respectively.Additionally,the panel and the backfill as well as the panel and the panel are rationally considered.The layer-by-layer filling process of backfill of retaining wall is also simulated.Comparing with the conventional calculation methods and the field measured data,the effectiveness of the method is proved tentatively.Meanwhile,the failure mode,the distribution of tensile stress of reinforcing materials and the safety index in high reinforced retaining walls are obtained.