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The objective of this paper is to study the mechanical characteristics of the interface between loess and geosynthetics, in hope of providing targeted suggestions for the design of reinforced loess projects. A large-scale interface shear apparatus was used to conduct direct shear tests on the geogrid-loess interface to study the effects of the moisture content and compaction degree of loess on the shear stress-shear displacement relationships, shear strength indices, and thickness of shear band of the geogrid-loess interface. The mechanism of the effects was analyzed, and the constitutive model of the geogrid-loess interface was discussed. The test results show that as the moisture content increases（not exceeding the plastic limit）, the shear stress-shear displacement curves of the geogrid-loess interface change from softening type to hardening type. The interface cohesion and friction angle significantly decrease with the increase of the moisture content, and thus the interface shear strength decreases accordingly. The thickness of shear band increases with the moisture content. The compaction degree of loess has little influence on the shear strength of the geogrid-soil interface, but it affects the thickness of shear band significantly. The thickness of shear band increases greatly when the compaction degree reaches 90%. Hence, the compaction degree of the backfill of reinforced loess engineering should not be less than 90%. The thickness of the shear band of geogrid-loess interface decreases continuously along the shear direction, with a maximum thickness of 3 cm approximately. This indicates that the shear band between the reinforcement and soil is the thinnest at the facing column in reinforced loess retaining walls. Hence, a flexible or integral facing column is recommended to be used in reinforced loess retaining walls. The hyperbolic interface constitutive model can effectively reflect the shear behavior of the geogrid-loess interface.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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