As an economical, environmentally friendly filling material with excellent engineering adaptability, geosynthetics have a wide range of application prospects in urban infrastructure such as foundation reinforcement. In order to solve the problem of subgrade water damage in the loess region of Northwest China, this study focused on exploring the influence of influencing factors such as reinforcement type, reinforcement spacing and confining pressure on the dynamic shear modulus based on resonant column and microscopic experiments. The results show that: The incorporation of reinforcement can effectively improve the dynamic shear modulus of the composite, and the three-way grid reinforcement system has the best lifting effect. The variation of normalized dynamic shear modulus with shear strain is consistent with the original attenuation curve, showing nonlinear attenuation, and the increase of confining pressure or the decrease of reinforcement spacing can delay the modulus attenuation, weaken the hysteretic effect, and improve its stiffness characteristics. SEM analysis showed that with the arrangement of the reinforcements, the cementation contact forms between the particles showed diversified characteristics, forming a stable skeleton structure, the pore volume gradually decreased, and the degree of directional arrangement of particles increased. The study confirms that geosynthetics can optimize the dynamic characteristics of loess and provide important theoretical support for the seismic design of loess subgrade.
Wang Wenxuan
,
Zhang Wuyu
,
Liu Haoyang
,
Guo Ruizhang
. Experimental Study on Small-Strain Dynamic Characteristics of Geosynthetics-Reinforced Loess[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 709
-717
.
DOI: 10.20174/j.JUSE.2025.S2.21
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