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土工格栅与土之间的界面参数是表征土工格栅加筋作用的重要参数,对土工格栅加筋土结构的稳定和变形破坏特征有显著影响。目前各类规范或标准关于格栅-土界面参数的取值均未考虑土工格栅特有的网孔结构尺寸的影响,致使实际工程中土工格栅的选用存在较大的人为性。针对这一问题,首先通过室内试验和数值方法的对比分析,建立了土工格栅界面特性研究的数值模型,并验证了数值方法研究土工格栅界面特性的可行性。以土工格栅界面特性研究的数值模型为基础,进一步开展了不同网孔尺寸条件下土工格栅界面特性的研究。研究结果表明,土工格栅网孔结构的网孔尺寸对格栅-土的界面特性有显著影响。通过分析不同网孔尺寸对界面特性影响的规律发现,为了更直观地揭示土工格栅的加筋作用,应该将格栅-土界面的摩擦作用从界面综合的摩擦作用中剥离出来。同时,土工格栅的合理网孔尺寸应保证格栅-土之间的有效接触面积占整个界面面积的1/3左右。
The interface parameter between geogrid and soil is an important parameter to characterize the effect of geogrid reinforcement, which has a significant impact on the stability and deformation and failure characteristics of geogrid-reinforced soil. At present all kinds of norms or standards on the grill - soil interface parameters are not taken into account the specific characteristics of the geogrid mesh structure size, resulting in the actual selection of geogrid there is a greater man-made. In order to solve this problem, a numerical model of the interface characteristics of geogrids has been established through the comparative analysis of laboratory tests and numerical methods. The feasibility of using numerical methods to study the interface characteristics of geogrids has been verified. Based on the numerical model of the interface characteristics of geogrids, the interface characteristics of geogrids under different mesh sizes are further studied. The results show that the mesh size of the geogrid mesh structure has a significant effect on the grid-soil interface characteristics. By analyzing the influence of different mesh sizes on the interface characteristics, we found that in order to reveal the reinforcement effect of geogrid more intuitively, the friction of grid-soil interface should be peeled off from the friction effect of interface synthesis. At the same time, the reasonable mesh size of geogrid should ensure that the effective contact area between the grid and earth accounts for about 1/3 of the total interface area.