生态挡土面层与格栅连接特性分离式试验研究

Separate Test Study on Mechanical Properties between the Surface of Ecological Retaining Wall and Reinforcement

生态袋与加筋格栅柔性挡土结构充分利用并改良土体材料的变形和强度特性,对地基承载力要求低,对环境适应性高,在许多挡土结构工程和边坡防护工程中被广泛应用.该种工艺下生态袋与加筋的连接强度强弱成为控制生态挡土结构面层乃至整个挡土结构稳定性的关键.通过室内拉拔试验和格栅拉伸试验对它们的连接强度作分离式试验研究.研究显示：生态袋装黏土被格栅反包拉拔试验分离式研究中拉拔总强度,直剪强度,格栅拉伸强度,拉拔试验有效袋-袋界面强度,复合效应力强度均随法向应力的增大而增大;其中格栅拉伸强度,拉拔试验有效袋-袋界面强度,复合效应力强度所占总强度比重范围分别是23.2％～ 47.4％,19.2％ ～ 29.2％,22.7％～57.6％.拉拔试验越来越表现为加筋格栅的拉伸,甚至纵筋被拉出.

Flexible soil retaining and reinforced soil retaining structure using ecological bags bear low Gapacity to the demanded foundation, is maken full use of and improved the deformation and the strength characteristics of the soil materials, owe high adaptability to the environment, widely used in a variety of retaining structure engineer- ings. and slope protection engineerings. In this kind of technology, ecological bag with reinforced connection inten- sity has become a key to control the stability of retaining structure surface layer, even the whole retaining structure. Through pullout test and geogrid tensile test, a separated test study is maken on their connection strength. The sep- arate test study result shows that： when the ecological bags filled with clay and reversely packaged by geogrid, drawing test total strength , shear strength, geogrid tensile strength, effective interfacial strength between bag and bag in drawing test, and the compound effect stress increase with the normal stress increasing; The geogrid tensile strength, effective interfacial strength between bag and bag in drawing test, and the compound effect stress, their proportions range of the total intensity corresponding respectively are 23. 2% -47.4%, 19. 2% -29. 2%, 22. 7% - 57.6%. Drawing test performance gradually become the drawing, even pulling-out of longitudinal geogrid reinforce- ment.