目前高大加筋土结构设计理论尚不完善，主要沿用一般加筋结构的理论与方法，导致垮塌事故时有发生。已有研究表明，高大加筋土结构中深层筋-土界面附近土的剪缩和筋材的拉缩特性降低了筋土的咬合作用，使得深层界面似摩擦系数明显低于浅层。鉴于此，本项目拟通过多学科交叉，基于负泊松比聚合物的拉胀效应，通过聚合物（聚乙烯/聚丙烯）的共混技术，研制一种负泊松比土工格栅。项目将对负泊松比土工格栅的制备工艺参数进行优化，研究其拉胀效应和吸振特性，建立泊松比-拉伸变形模型和蠕变模型；研究负泊松比土工格栅与填料界面的静、动态特性，并揭示负泊松比土工格栅与填料的宏细观协同作用机理；研究静、动荷载作用下负泊松比土工格栅加筋土结构的变形规律，揭示土工格栅拉胀效应对加筋土破坏模式的影响；提出考虑格栅拉胀效应的加筋土结构变形计算与稳定性分析方法。本项目研究将对强化筋土界面作用和增强高大加筋土结构的稳定性起到重要作用。

At present, the theories of tall reinforced earth structure design are inadequate, which mainly follows the ordinary reinforced earth structure theories and methods and results in many collapse disasters. Previous researches have shown that it is the shear contraction of the soil and the tensive thining of the reinforcement which reduce the occlusion effect of the soil-geosynthetic interface in the deeper layer of the reinforced earth stucture and make the friction coefficient of the interface much lower than shallower layer. In this project, a kind of polyethylene/polypropylene geogrid with negative Poison's ratio will be developed through the hybrid technology. The process parameters of the geogrid will be optimized with the tests on the auxetic effect and vibration-absorbing property. Poison's ration-tensile deformation model and creep model will be established by tests. Furthermore, this project will also study on the static and dynamic characteristics of the fill-geogrid interface and reveal the macro-micro synergy interaction mechanism of the fill and the geogrid with negative Poison's ratio. The deformation and failure mode of the earth structure reinforced with negative Poison's ratio geogrid under both static and dynamic loads will be studied. Considering the auxetic effect of geogrid, the deformation calculation method and the stability analysis method of the reinforced earth structure will be put forward. These studies will play an important role in the reinforcement of soil-geosynthetic interface and the enhancement of the stability of tall reinforced earth structural.