- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
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| Citation: | GAO Rui, SHI Zhizheng, LIU Yangzepeng, CHEN Jing, ZHANG Ronglong. Experimental Study on Effect of Geogrid on Direct Shear Behavior of Contaminated Ballast[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1185-1191. doi: 10.3969/j.issn.0258-2724.20191142
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In order to investigate the effect of geogrid on the mechanical properties of clay-contaminated ballast, a series of direct shear tests were carried out on geogrid-reinforced ballast specimens under four normal pressures and three degrees of clay pollution. The effects of geogrid on the shear strength and shear deformation of ballast specimens were compared and analyzed. The reinforcement effect of geogrid on ballast with consideration of clay pollution was studied. The results show that the geogrid can increase the shear strength of clean and clay-contaminated ballast samples, and the peak shear strength reaches 24% when the void contamination index (VCI) is 20%. Ballast shear strength exhibits typical non-linear characteristics, and the relationship between fitting parameters of non-linear strength criterion and pollution degrees can be fitted by an exponential function. The fitting results can be used as the basis for strength estimation of contaminated-ballast in practical engineering. Meanwhile, geogrid can reduce the maximum dilatancy of the sample; it can also reduce the peak dilatancy angle by about 0.7°～3.7°, and achieve its maximum reinforcement effect at the VCI of 20%.
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